
Citation 
 Permanent Link:
 http://ufdc.ufl.edu/AA00017660/00001
Material Information
 Title:
 Wave transformation by bathymetric anomalies with gradual transitions in depth and resulting shoreline response
 Creator:
 Bender, Christopher, 1976
 Publication Date:
 2003
 Language:
 English
 Physical Description:
 xx, 236 p. : ill. ; 29 cm.
Subjects
 Subjects / Keywords:
 Amplitude ( jstor )
Analytics ( jstor ) Bathymetry ( jstor ) Modeling ( jstor ) Reflectance ( jstor ) Shorelines ( jstor ) Three dimensional modeling ( jstor ) Two dimensional modeling ( jstor ) Velocity ( jstor ) Waves ( jstor ) Civil and Coastal Engineering thesis, Ph.D ( lcsh ) Dissertations, Academic  Civil and Coastal Engineering  UF ( lcsh )
 Genre:
 bibliography ( marcgt )
theses ( marcgt ) nonfiction ( marcgt )
Notes
 Thesis:
 Thesis (Ph.D.)University of Florida, 2003.
 Bibliography:
 Includes bibliographical references.
 General Note:
 Printout.
 General Note:
 Also issued as Technical report 132.
 General Note:
 Vita.
 Statement of Responsibility:
 by Christopher J. Bender.
Record Information
 Source Institution:
 University of Florida
 Holding Location:
 University of Florida
 Rights Management:
 Copyright [name of dissertation author]. Permission granted to the University of Florida to digitize, archive and distribute this item for nonprofit research and educational purposes. Any reuse of this item in excess of fair use or other copyright exemptions requires permission of the copyright holder.
 Resource Identifier:
 030281601 ( ALEPH )
52731634 ( OCLC )

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Full Text 
WAVE TRANSFORMATION BY BATHYMETRIC ANOMALIES WITH GRADUAL
TRANSITIONS IN DEPTH AND RESULTING SHORELINE RESPONSE
By
CHRISTOPHER J. BENDER
A DISSERTATION PRESENTED TO THE GRADUATE SCHOOL
OF THE UNIVERSITY OF FLORIDA IN PARTIAL FULFILLMENT
OF THE REQUIREMENTS FOR THE DEGREE OF
DOCTOR OF PHILOSOPHY
UNIVERSITY OF FLORIDA
2003
WAVE TRANSFORMATION BY BATHYMETRIC ANOMALIES WITH GRADUAL
TRANSITIONS IN DEPTH AND RESULTING SHORELINE RESPONSE
By
CHRISTOPHER J. BENDER
A DISSERTATION PRESENTED TO THE GRADUATE SCHOOL
OF THE UNIVERSITY OF FLORIDA IN PARTIAL FULFILLMENT
OF THE REQUIREMENTS FOR THE DEGREE OF
DOCTOR OF PHILOSOPHY
UNIVERSITY OF FLORIDA
2003
ACKNOWLEDGMENTS
I am truly blessed to have my wife and best friend, Kathryn, in my life. This
completion of this work was made possible by her support, encouragement, and love. I
am fortunate beyond measure to have her next to me as I walk lifes journey.
Many individuals at the University of Florida have made the completion of this
work possible. Dr. Robert G. Dean has not only been my major advisor but also my
mentor and friend during my studies at the University of Florida. I have gained many
valuable lessons from his work ethic, his character, and his tireless quest for
understanding the coastal environment. I am grateful to the other members of my
committee (Dr. Daniel M. Hanes, Dr. Andrew Kennedy, Dr. Ulrich H. Kurzweg, Dr.
Robert J. Thieke) for their instruction and involvement during the course of my doctoral
studies.
I wish to thank my family (especially Mom and Dad B, Mom and Dad Z, Caryn,
John, and Kristin) and friends for their support in all my endeavors. Each of them has
contributed to who I am today.
An Alumni Fellowship granted by the University of Florida sponsored this study
with partial support from the Bureau of Beaches and Wetland Resources of the State of
Florida.
11
TABLE OF CONTENTS
page
ACKNOWLEDGMENTS ii
LIST OF TABLES vi
LIST OF FIGURES vii
ABSTRACT xix
CHAPTER
1 INTRODUCTION AND MOTIVATION 1
1.1 Motivation 2
1.2 Models Developed and Applications 4
2 LITERATURE REVIEW 7
2.1 Case Studies 8
2.1.1 Grand Isle, Louisiana (1984) 8
2.1.2 Anna Maria Key, Florida (1993) 11
2.1.3 Martin County, Florida (1996) 15
2.2 Field Experiments 16
2.2.1 Price etal. (1978) 17
2.2.2 Kojima et al. (1986) 17
2.3 Laboratory Experiments 19
2.3.1 Horikawa et al. (1977) 19
2.3.2 Williams (2002) 20
2.4 Wave Transformation 23
2.4.1 Analytic Methods 23
2.4.1.1 2Dimensional methods 24
2.4.1.2 3Dimensional methods 34
2.4.2 Numerical Methods 40
2.5 Shoreline Response 46
2.5.1 Longshore Transport Considerations 46
2.5.2 Refraction Models 47
2.5.2.1 Motyka and Willis (1974) 47
2.5.2.2 Horikawa et al. (1977) 49
2.5.3 Refraction and Diffraction Models 51
2.5.3.1Gravens and Rosati (1994) 51
iii
2.53.2Tang (2002) 54
2.5.4 Refraction, Diffraction, and Reflection Models 54
2.5.4.1Bender (2001) 54
3 2DIMENSIONAL MODEL THEORY AND FORMULATION 59
3.1 Introduction 59
3.2 Step Method: Formulation and Solution 60
3.2.1 Abrupt Transition 63
3.2.2 Gradual Transition 65
3.3 Slope Method: Formulation and Solution 67
3.3.1 Single Transition 69
3.3.2 Trench or Shoal 72
3.4 Numerical Method: Formulation and Solution 74
4 3DIMENSIONAL MODEL THEORY AND FORMULATION 77
4.1 Introduction 77
4.2 Step Method: Formulation and Solution 77
4.2.1 Abrupt Transition 81
4.2.2 Gradual Transition 85
4.3 Exact Shallow Water Solution Method: Formulation and Solution 88
5 2DIMENSIONAL MODEL RESULTS AND COMPARISONS 92
5.1 Introduction 92
5.2 Matching Condition Evaluation 92
5.3 Wave Transformation 95
5.3.1 Comparison of 2D Step Model to Numerical Model FUNWAVE 1.0. 97
5.4 Energy Reflection 99
5.4.1 Comparison to Previous Results 99
5.4.2 Arbitrary Water Depth 101
5.4.3 Long Waves 116
6 3DIMENSIONAL MODEL RESULTS AND COMPARISONS 125
6.1 Introduction 125
6.2 Matching Condition Evaluation 126
6.3 Wave Height Modification 127
6.3.1 Comparison of 3D Step Model and Analytic Shallow Water Exact
Model 141
6.4 Wave Angle Modification 144
6.5 Comparison of 3D Step Model to Numerical Models 147
6.5.1 3D Step Model Versus REF/DIF1 148
6.5.2 3D Step Model Versus 2D Fully Nonlinear Boussinesq Model 154
6.6 Comparison to Laboratory Data of Chawla and Kirby (1996) 156
6.7 Direction Averaged Wave Field Modification 161
IV
6.8 Energy Reflection 166
6.8.1 Comparison to Prior Results 166
6.8.2 Effect of Transition Slope on Reflection 167
6.9 Analytic Nearshore Shoaling and Refraction Method 171
6.9.1 Comparison of Analytic Method to REF/DIF1 176
6.9.2 Wave Averaged Results 183
6.10 Shoreline Evolution Model 185
6.10.1 Shoreline Change Estimates Shoreward of Bathymetric Anomalies. 186
6.10.2 Effect of Nearshore Form on Shoreline Change 197
6.10.3 Investigation of Boundary Conditions 200
6.10.4 Investigation of Transition Slope on Shoreline Evolution 202
7 CONCLUSIONS AND DIRECTIONS FOR FUTURE STUDY 208
7.1 Conclusions 208
7.2 Future Work 211
APPENDIX
A ANALYTIC WAVE ANGLE CALCULATION 213
B ANALYTIC FARFIELD APPROXIMATION OF ENERGY REFLECTION....215
C ANALYTIC NEARSHORE SHOALING AND REFRACTION METHOD 218
D ANALYTIC SHORELINE CHANGE THEORY AND CALCULATION 222
REFERENCES 228
BIOGRAPHICAL SKETCH 236
v
LIST OF TABLES
Table page
21 Capabilities of selected nearshore wave models 42
41 Specifications for two bathymetries for exact solution method 91
vi
LIST OF FIGURES
Figure page
21 Aerial photograph showing salients shoreward of borrow area looking East
to West along Grand Isle, Louisiana, in August, 1985 9
22 Aerial photograph showing salients shoreward of borrow area along Grand
Isle, Louisiana, in 1998 10
23 Bathymetry off Anna Maria Key, Florida, showing location of borrow pit
following beach nourishment project 13
24 Beach profile through borrow area at R26 in Anna Maria Key, Florida 14
25 Shoreline position for Anna Maria Key Project for different periods relative
to August, 1993 14
26 Project area for Martin County beach nourishment project 15
27 Fouryear shoreline change for Martin County beach nourishment project:
predicted versus survey data 16
28 Setup for laboratory experiment 19
29 Results from laboratory experiment showing plan shape after two hours 20
210 Experiment sequence timeline for Williams laboratory experiments 21
211 Volume change per unit length for first experiment 22
212 Shifted even component of shoreline change for first experiment 23
213 Reflection and transmission coefficients for linearly varying depth [h/hm]
and linearly varying breadth [b2/bm2] 26
214 Approximate reflection and transmission coefficients for the rectangular
parallelepiped of length 8.86h0 in infinitely deep water 27
215 Reflection coefficient for a submerged obstacle 28
vii
216 Transmission coefficient as a function of relative wavelength (h=10.1 cm,
d=67.3 cm, trench width =161.6 cm) 30
217 Transmission coefficient as a function of relative wavelength for
trapezoidal trench; setup shown in inset diagram 31
218 Reflection coefficient for asymmetric trench and normally incident waves
as a function of Khi: li2/hi=2, h3/hi=0.5, L/hi=5; L = trench width 32
219 Transmission coefficient for symmetric trench, two angles of incidence:
L/hi=10, h2/hi=2; L = trench width 32
220 Transmission coefficient as a function of relative trench depth; normal
incidence: kih]= 0.2: (a) L/hi=2; (b) L/hi=8, L = trench width 33
221 Total scattering cross section of vertical circular cylinder on bottom 35
222 Contour plot of relative amplitude in and around pit for normal incidence;
k]/d = n/l 0, k2/h=7i/10V2, h/d=0.5, b/a =1, a/d=2, a = crossshore pit length,
b = longshore pit length, h = water depth outside pit, d = depth inside pit, L2
= wavelength outside pit 37
223 Contour plot of diffraction coefficient in and around pit for normal
incidence; a/L=l, b/L=0.5, d/h =3, kh=0.167 39
224 Contour plot of diffraction coefficient around surfacepiercing breakwater
for normal incidence; a/L=l, b/L=0.5, kh=0.167 39
225 Maximum and minimum relative amplitudes for different koa, for normal
incidence, a/b=6, a/d=n, and d/h=2 40
226 Comparison of wave height profiles for selected models along transect
parallel to shore located 9 m shoreward of shoal apex[*=experimental data] 44
227 Comparison of wave height profiles for selected models along transect
perpendicular to shore and through shoal apex [^experimental data] 44
228 Calculated beach planform due to refraction after two years of prototype
waves for two pit depths 48
229 Calculated beach planform due to refraction over dredged hole after two
years of prototype waves 50
230 Comparison of changes in beach plan shape for laboratory experiment and
numerical model after two years of prototype waves 51
viii
231 Nearshore wave height transformation coefficients near borrow pit from
RCPWAVE study 53
232 Nearshore wave angles near borrow pit from RCPWAVE study; wave
angles are relative to shore normal and are positive for westerly transport 53
233 Reflection coefficients versus dimensionless pit diameter divided by
wavelength inside and outside the pit; water depth = 2 m, pit depth = 4 m 55
234 Shoreline evolution resulting from each transport term individually for
transect located 80 m shoreward of a pit with a radius = 6m, last time step
indicated with [+] 57
235 Shoreline evolution using full transport equation and analytic solution
model for transect located 80 m shoreward of a pit with a radius = 6m, last
time step indicated with [+] 58
31 Definition sketch for trench with vertical transitions 63
32 Definition sketch for trench with stepped transitions 66
33 Definition sketch for linear transition 70
34 Definition sketch for trench with sloped transitions 73
41 Definition sketch for circular pit with abrupt depth transitions 78
42 Definition sketch for boundary of abrupt depth transition 82
43 Definition sketch for boundaries of gradual depth transitions 85
44 Definition sketch for boundaries of exact shallow water solution method 90
51 Matching conditions with depth for magnitude of the horizontal velocity and
velocity potential for trench with abrupt transitions and 16 evanescent
modes 94
52 Matching conditions with depth for phase of the horizontal velocity and
velocity potential for trench with abrupt transitions and 16 evanescent
modes 94
53 Relative amplitude for crosstrench transect for kthi = 0.13; trench
bathymetry included with slope = 0.1 95
54 Relative amplitude for crossshoal transect for k]hi = 0.22; shoal bathymetry
included with slope = 0.05 96
IX
55 Relative amplitude along crosstrench transect for Analytic Model and
FUNWAVE 1D for kjhi = 0.24; trench bathymetry included with slope =
0.1 98
56 Relative amplitude along crossshoal transect for Analytic Model and
FUNWAVE 1D for k]hi = 0.24; shoal bathymetry included with upwave
slope of 0.2 and downwave slope of 0.05 99
57 Comparison of reflection coefficients from step method and Kirby and
Dalrymple (1983a Table 1) for symmetric trench with abrupt transitions and
normal wave incidence: h3 = hi, h2/ht = 3, W/hi = 10 100
58 Comparison of transmission coefficients from step method and Kirby and
Dalrymple (1983a Table 1) for symmetric trench with abrupt transition and
normal wave incidence: h3 = hi, h2/hi = 3, W/hi = 10 101
59 Setup for symmetric trenches with same depth and different bottom widths
and transition slopes 102
510 Reflection coefficients versus kihi for trenches with same depth and
different bottom widths and transition slopes. Only onehalf of the
symmetric trench crosssection is shown with slopes of 5000, 1, 0.2 and 0.1. ...103
511 Transmission coefficients versus kihi for trenches with same depth and
different bottom widths and transition slopes. Only onehalf of the
symmetric trench crosssection is shown with slopes of 5000, 1, 0.2 and 0.1. ...104
512 Reflection coefficient versus the number of evanescent modes used for
trenches with same depth and transition slopes of 5000, 1, and 0.1 105
513 Reflection coefficient versus the number of steps for trenches with same
depth and transition slopes of 5000, 1, and 0.1 106
514 Reflection coefficients versus kjhi for trenches with same bottom width and
different depths and transition slopes. Only onehalf of the symmetric
trench crosssection is shown with slopes of 5000, 1, 0.2 and 0.05 107
515 Reflection coefficients versus kihi for trenches with same top width and
different depths and transition slopes. Only onehalf of the symmetric
trench crosssection is shown with slopes of 5000, 5, 2, and 1 108
516 Reflection coefficients versus kjhi for trenches with same depth and bottom
width and different transition slopes. Only onehalf of the symmetric trench
crosssection is shown with slopes of 5000, 0.2, 0.1, and 0.05 109
x
517 Reflection coefficients versus kihi for shoals with same depth and different
top widths and transition slopes. Only onehalf of the symmetric shoal
crosssection is shown with slopes of 5000, 0.5, 0.2 and 0.05 110
518 Reflection coefficients versus k(hi for Gaussian trench with Ci = 2 m and
C2 12 m and ho = 2 m. Only onehalf of the symmetric trench cross
section is shown with 43 steps approximating the nonplanar slope 111
519 Reflection coefficients versus kihi for Gaussian shoal with Ci = 1 m and C2
= 8 m and ho = 2 m. Only onehalf of the symmetric shoal crosssection is
shown with 23 steps approximating the nonplanar slope 112
520 Reflection coefficients versus kihi for a symmetric abrupt transition trench,
an asymmetric trench with Si = 1 and S2 = 0.1 and a mirror image of the
asymmetric trench 113
521 Reflection coefficients versus k)hi for an asymmetric abrupt transition
trench (hi hs), an asymmetric trench with gradual depth transitions (hi hi
and si = S2 = 0.2) and a mirror image of the asymmetric trench with sÂ¡ = S2 114
522 Reflection coefficients versus k)hi for an asymmetric abrupt transition
trench (hi h5), an asymmetric trench with gradual depth transitions (hi ^ h5
and si = 1 and S2 = 0.2) and a mirror image of the asymmetric trench with si
*s2 115
523 Reflection coefficient versus the space step, dx, for trenches with same
depth and different bottom width and transition slopes. Only onehalf of the
symmetric trench crosssection is shown with slopes of 5000, 1 and 0.1 117
524 Reflection coefficients versus kihi for three solution methods for the same
depth trench case with transition slope equal to 5000. Only onehalf of the
symmetric trench crosssection is shown 118
525 Reflection coefficients versus k3h3 for three solution methods for same
depth trench case with transition slope equal to 1. Only onehalf of the
symmetric trench crosssection is shown 119
526 Reflection coefficients versus k3h3 for three solution methods for same
depth trench case with transition slope equal to 0.1. Only onehalf of the
symmetric trench crosssection is shown 119
527 Conservation of energy parameter versus k3h3 for three solution methods
for same depth trench case with transition slope equal to 1. Only onehalf
of the symmetric trench crosssection is shown 120
528 Reflection coefficients versus kihi for step and numerical methods for
Gaussian shoal (ho = 2 m, Ci = 1 m, C2 = 8 m). Only onehalf of the
xi
symmetric shoal crosssection is shown with 23 steps approximating the
nonplanar slope
121
529 Reflection coefficients versus for step and numerical methods for
Gaussian trench in shallow water (ho = 0.25 m, Q = 0.2 m, C2 = 3 m). Only
onehalf of the symmetric trench crosssection is shown with 23 steps
approximating the nonplanar slope 122
530 Reflection coefficients versus k3h3 for three solution methods for same
depth trench case with symmetric abrupt transition trench and asymmetric
trench with unequal transition slopes equal to 1 and 0.1. 123
531 Reflection coefficients versus k3h3 for three solution methods for same
depth trench case with asymmetric abrupt transition trench and asymmetric
trench with unequal transition slopes equal to 1 and 0.2 124
61 Matching conditions with depth for magnitude of the horizontal velocity and
velocity potential for pit with abrupt transitions and 10 evanescent modes 127
62 Matching conditions with depth for phase of the horizontal velocity and
velocity potential for pit with abrupt transitions and 10 evanescent modes 128
63 Contour plot of relative amplitude with kihi = 0.24 for pit with transition
slope = 0.1; crosssection of pit bathymetry through centerline included 129
64 Relative amplitude for crossshore transect at Y = 0 with kihi = 0.24 for pit
with transition slope = 0.1; crosssection of pit bathymetry through
centerline included. Note small reflection 130
65 Relative amplitude for longshore transect at X = 300 m with k]hj = 0.24 for
pit with transition slope = 0.1; crosssection of pit bathymetry through
centerline included 130
66 Relative amplitude versus number of evanescent modes included for
different Bessel function summations at two locations directly shoreward of
a pit with abrupt transitions in depth 132
67 Relative amplitude versus number of steps approximating slope for different
Bessel function summations for two pits with gradual transitions in depth 133
68 Contour plot of relative amplitude for shoal with kihi = 0.29 and transition
slope = 0.1; crosssection of shoal bathymetry through centerline included 134
69 Relative amplitude for crossshore transect at Y = 0 for same depth pits for
k]h] = 0.15; crosssection of pit bathymetries through centerline included
with slopes of abrupt, 1, 0.2 and 0.07 135
xii
610 Relative amplitude for crossshore transect at Y = 0 for same depth pits for
kihi = 0.3; crosssection of pit bathymetries through centerline included
with slopes of abrupt, 1, 0.2 and 0.07 136
611 Relative amplitude for alongshore transect at X = 200 m for same depth pits
for kihi =0.15; crosssection of pit bathymetries through centerline
included with slopes of abrupt, 1, 0.2 and 0.07 137
612 Relative amplitude for alongshore transect at X = 200 m for same depth pits
for k]h] = 0.3; crosssection of pit bathymetries through centerline included
with slopes of abrupt, 1, 0.2 and 0.07 138
613 Relative amplitude for crossshore transect located at Y = 0 for same depth
shoals with kihi =0.15; crosssection of shoal bathymetries through
centerline included with slopes abrupt, 1, 0.2 and 0.05 139
614 Relative amplitude for alongshore transect located at X = 300 m for same
depth shoals with kihi =0.15; crosssection of shoal bathymetries through
centerline included abrupt, 1, 0.2 and 0.05 140
615 Relative amplitude for crossshore transect at Y = 0 for pit with Gaussian
transition slope for kihi = 0.24; crosssection of pit bathymetry through
centerline included 141
616 Relative amplitude for crossshore transect at Y = 0 for pit with for h = C/r
in region of transition slope; crosssection of pit bathymetry through
centerline included 142
617 Relative amplitude for longshore transect at X = 100 m for pit with for h =
C/r in region of transition slope; crosssection of pit bathymetry through
centerline included 143
618 Relative amplitude for crossshore transect at Y = 0 for shoal with for h =
C*r in region of transition slope; crosssection of shoal bathymetry through
centerline included 143
619 Relative amplitude for longshore transect at X = 100 m for shoal with for h
= C*r in region of transition slope; crosssection of shoal bathymetry
through centerline included 144
620 Contour plot of wave angles in degrees for pit with kthi = 0.24 and
transition slope = 0.1; crosssection of pit bathymetry through centerline
included 145
621 Contour plot of wave angles for Gaussian shoal with Ci =1 and C2 = 10 for
kihi = 0.22; crosssection of shoal bathymetry through centerline included
with 23 steps approximating slope 146
xiii
622 Wave angle for alongshore transect at X = 300 m for same depth pits for
kihi =0.15; crosssection of pit bathymetries through centerline included
with slopes of abrupt, 1, 0.2 and 0.07. Negative angles indicate divergence
of wave rays 147
623 Relative amplitude using 3D Step Model and REF/DIF1 for crossshore
transect at Y = 0 for Gaussian pit with kihi = 0.24; crosssection of pit
bathymetry through centerline included 149
624 Relative amplitude using 3D Step Model and REF/DIF1 for longshore
transect at X = 100 m for Gaussian pit with kiht = 0.24; crosssection of pit
bathymetry through centerline included 150
625 Relative amplitude using 3D Step Model and REF/DIF1 for longshore
transect at X = 400 m for Gaussian pit with kihi = 0.24; crosssection of pit
bathymetry through centerline included 151
626 Wave angle using 3D Step Model and REF/DIF1 for longshore transect at
X = 100 m for Gaussian pit with kihi = 0.24; crosssection of pit
bathymetry through centerline included 152
627 Relative amplitude using 3D Step Model and REF/DIF1 for crossshore
transect at Y = 0 for pit with linear transitions in depth with kihi = 0.24;
crosssection of pit bathymetry through centerline included with slope =
0.1 153
628 Relative amplitude using 3D Step Model and REF/DIF1 for longshore
transect at X = 350 m for pit with linear transitions in depth with kjhi =
0.24; crosssection of pit bathymetry through centerline included with slope
= 0.1 154
629 Relative amplitude using 3D Step Model and 2D fully nonlinear
Boussinesq model for crossshore transect at Y = 0 for shoal with kihi =
0.32; crosssection of pit bathymetry through centerline included 155
630 Experimental setup of Chawla and Kirby (1986) for shoal centered at (0,0)
with data transects used in comparison shown 157
631 Relative amplitude using 3D Step Model, FUNWAVE 2D and data from
Chawla and Kirby (1996) for crossshore transect AA with kihi = 1.89;
crosssection of shoal bathymetry through centerline included 158
632 Relative amplitude using 3D Step Model, FUNWAVE 2D and data from
Chawla and Kirby (1996) for longshore transect EE with kihj = 1.89;
crosssection of shoal bathymetry through centerline included 159
xiv
633 Relative amplitude using 3D Step Model, FUNWAVE 2D and data from
Chawla and Kirby (1996) for longshore transect DD with kihj = 1.89;
crosssection of shoal bathymetry through centerline included 160
634 Relative amplitude using 3D Step Model, FUNWAVE 2D and data from
Chawla and Kirby (1996) for longshore transect BB with kihi = 1.89;
crosssection of shoal bathymetry through centerline included 161
635 Relative amplitude averaged over incident direction (centered at 0 deg) for
alongshore transect at X = 300 m for pit with k]hi = 0.24; crosssection of
pit bathymetries through centerline included with slope = 0.1 162
636 Wave angle averaged over incident direction (centered at 0 deg) for
alongshore transect at X = 300 m for pit with kih] = 0.24 with bathymetry
indicated in inset diagram of previous figure 163
637 Relative amplitude averaged over incident direction (centered at 20 deg) for
alongshore transect at X = 300 m for pit with kjhi = 0.24; crosssection of
pit bathymetries through centerline included with slope = 0.1 165
638 Wave angle averaged over incident direction (centered at 20 deg) for
alongshore transect at X = 300 m for pit with kihj = 0.24 with bathymetry
indicated in inset diagram of previous figure 165
639 Reflection coefficient versus nondimensional diameter; comparison
between shallow water transect method and farfield approximation method. ...167
640 Reflection coefficient versus kihi based on farfield approximation and
constant volume and depth pits; crosssection of pit bathymetries through
centerline included with slopes of abrupt, 1, 0.2 and 0.07 168
641 Reflection coefficient versus kihi based on farfield approximation and
constant volume bottom width pits; crosssection of pit bathymetries
through centerline included with slopes of abrupt, 1, 0.2 and 0.05 169
642 Reflection coefficient versus kihi based on farfield approximation and
constant volume and depth shoals; crosssection of shoal bathymetry
through centerline included with slopes of abrupt, 1, 0.2 and 0.07 170
643 Bathymetry for two nearshore regions used in analytic shoaling and
refraction model: Pit 1; linear transition slopes with linear nearshore slope
and Pit 2; Gaussian transition slopes with Equilibrium Beach form for
nearshore slope 172
644 Wave height and wave angle values at start of nearshore region and at
breaking for longshore transect with bathymetry with H = 1 m and T = 12 s
for Pit 1 173
xv
645 Contour plot of wave height for Pit 1 in nearshore region with breaking
location indicated with H = 1 m and T = 12 s 174
646 Wave height and wave angle values at start of nearshore region and at
breaking for longshore transect with bathymetry with H = 1 m and T = 12 s
for Pit 2 bathymetry 175
647 Contour plot of wave height for Pit 2 in nearshore region with breaking
location indicated with H = 1 m and T = 12 s 176
648 Wave height and wave angle values at start of nearshore region from 3D
Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 1 177
649 Wave height and wave angle values at h = 1.68 m (X = 616 m) from 3D
Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 1 178
650 Wave height and wave angle values at h = 1.44 m (X = 628 m) from 3D
Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 1 179
651 Wave height and wave angle values at start of nearshore region from 3D
Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 2 180
652 Wave height and wave angle values at h = 2.04 m (X = 672 m) from 3D
Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 2 181
653 Wave height and wave angle values at h = 1.6 m (X = 704 m) from 3D
Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 2 182
654 Weighted wave averaged values of wave height and wave angle at start of
nearshore region and at breaking for longshore transect with H=lm and T
= 12 s and bathymetry for Pit 1 184
655 Weighted wave averaged values of wave height and wave angle at start of
nearshore region and at breaking for longshore transect with H = 1 m and T
= 12 s and bathymetry for Pit 2 184
656 Shoreline evolution for case Pit 1 with Kj = 0.77 and K2 = 0.4 for incident
wave height of 1 m, wave period of 12 s, and time step of 50 s with
shoreline advancement in the negative X direction; Pit 1 bathymetry along
crossshore transect included 187
657 Parameters for shoreline change after 1st time step showing shoreline
position, and longshore transport terms for case Pit 1 with Kj = 0.77 and K2
= 0 188
658 Final shoreline planform for case Pit 1 with Kj = 0.77 and K2 = 0, 0.2, 0.4,
and 0.77 for incident wave height of 1 m and T = 12 s, with shoreline
xvi
advancement in the negative X direction; Pit 1 bathymetry along cross
shore transect included
189
659 Change in shoreline position with modeling time at 4 longshore locations
(Yp = 0, 100, 200, 300 m) for case Pit 1 with Ki = 0.77 and K2 = 0.4 with
shoreline advancement in the negative X direction; Pit 1 bathymetry along
crossshore transect included 191
660 Comparison of wave height and wave angle values at 600 m and 600 m +/
20 m for case of Pit 1 for T = 12 s with bathymetry and transect locations
indicated in bottom plot 192
661 Final shoreline planform for case Pit 2 with Ki = 0.77 and K2 = 0, 0.2, 0.4,
and 0.77 for incident wave height of 1 m, wave period of 12 s, and time step
of 50 s with shoreline advancement in the negative X direction; Pit 2
bathymetry along crossshore transect included 193
662 Shoreline evolution for case Pit 2 with Kt = 0.77 and K2 = 0 for incident
wave height of 1 m, wave period of 12 s, and time step of 50 s with
shoreline advancement in the negative X direction; Pit 2 bathymetry along
crossshore transect included 194
663 Change in shoreline position with modeling time at 4 longshore locations
(Yp = 0, 100, 200, 300 m) for case Pit 2 with Ki = 0.77 and K2 = 0 with
shoreline advancement in the negative X direction; Pit 2 bathymetry along
crossshore transect included 195
664 Final shoreline planform for case Shoal 1 with Ki = 0.77 and K2 = 0, 0.2,
0.4, and 0.77 for incident wave height of 1 m, wave period of 12 s, and time
step of 50 s with shoreline advancement in the negative X direction; Shoal 1
bathymetry along crossshore transect included 196
665 Shoreline evolution for case Shoal 1 with Ki = 0.77 and K2 = 0.2 for
incident wave height of 1 m, wave period of 12 s, and time step of 50 s with
shoreline advancement in the negative X direction; Shoal 1 bathymetry
along crossshore transect included 197
666 Final shoreline planform for case Pit 1 with linear nearshore slope and EBP
form for T = 12 s and with K] = 0.77 and K2 = 0 and 0.77 with shoreline
advancement in the negative X direction; Pit 1 and Pit lb bathymetry along
crossshore transect included 198
667 Final shoreline planform for case Shoal 1 (linear nearshore slope) and Shoal
lb (Equilibrium Beach Profile) for T = 12 s and with Ki = 0.77 and K2 = 0
and 0.77 with shoreline advancement in the negative X direction; Shoal 1
and Shoal lb bathymetry along crossshore transect included 199
xvii
668 Final shoreline planform for case Pit 1 for T = 12 s and with K] = 0.77 and
K2 = 0.4 for two boundary conditions with shoreline advancement in the
negative X direction; Pit 1 bathymetry along crossshore transect included 201
669 Final shoreline planform for case Shoal 1 for T = 12 s and with K] = 0.77
and K2 = 0.77 for two boundary conditions with shoreline advancement in
the negative X direction; Shoal 1 bathymetry along crossshore transect
included 202
670 Final shoreline planform for constant volume pits for T = 12 s and with Ki
= 0.77 and K2 = 0 with shoreline advancement in the negative X direction;
crosssection of pit bathymetries through centerline included with slopes of
abrupt, 1, 0.2, 0.07 203
671 Final shoreline planform for constant volume pits for T = 12 s and with Ki
= 0.77 and K2 = 0 and 0.4 with shoreline advancement in the negative X
direction; crosssection of pit bathymetries through centerline included with
slopes of abrupt, 1, 0.2, 0.07 205
672 Final shoreline planform for 5 periods for constant volume pits with Ki =
0.77 and K2 = 0 with shoreline advancement in the negative X direction;
crosssection of pit bathymetry through centerline included with slope 0.2 205
673 Maximum shoreline advancement and retreat versus period for constant
volume pits with Ki = 0.77 and K2 = 0; crosssection of pit bathymetries
through centerline included with slopes of abrupt, 1, 0.2, 0.07 206
674 Maximum shoreline advancement and retreat versus period for constant
volume pits with Ki = 0.77 and K2 = 0.4; crosssection of pit bathymetries
through centerline included with slopes of abrupt, 1, 0.2, 0.07 207
Cl Setup for analytic nearshore shoaling and refraction method 218
Dl Definition sketch for analytic shoreline change method showing shoreline
and contours for initial location and after shoreline change 223
xviii
Abstract of Dissertation Presented to the Graduate School
of the University of Florida in Partial Fulfillment of the
Requirements for the Degree of Doctor of Philosophy
WAVE TRANSFORMATION BY BATHYMETRIC ANOMALIES WITH GRADUAL
TRANSITIONS IN DEPTH AND RESULTING SHORELINE RESPONSE
By
Christopher J. Bender
May 2003
Chair: Robert G. Dean
Major Department: Civil and Coastal Engineering
Analytic models for the propagation of linear water waves over a trench or shoal
of finite width and infinite length (2D Step Model) and over an axisymmetric
bathymetric anomaly (3D Step Model) are developed. The models are valid in a region
of uniform depth containing a bathymetric anomaly of uniform depth with gradual
transitions in depth allowed as a series of uniform depth steps approximating linear or
nonlinear slopes. The velocity potential obtained determines the wave field in the
domain.
The 2D Step Model provides the complete wave field and, therefore, the
reflection and transmission characteristics for depth anomalies of infinite length that are
either symmetric or asymmetric. The 3D Step Model determines the wave
transformation caused by the processes of wave refraction, diffraction and reflection.
Using the known velocity potential an energy flux approach is used to calculate the wave
angle and reflected energy at large distances from the anomaly. The 3D Step Model is
xix
joined with an analytic shoaling and refraction model (Analytic S/R Model) to extend the
solution into the nearshore region. The Analytic S/R Model is employed to propagate
the wave field up to the point of depth limited breaking. The breaking wave conditions
are used to drive the longshore sediment transport and associated shoreline change using
the Shoreline Change Model, which provides estimates of the equilibrium shoreline
planform located landward of a bathymetric anomaly.
Comparisons of the 2D Step Model to shallow water models developed in the
study, previous studies, and a numerical model are made with good agreement
demonstrated. The reflection coefficients found for symmetric and asymmetric trenches
and shoals indicate multiple and no instances of complete transmission, respectively, with
the solution independent of the incident wave direction for both cases.
Comparisons to a shallow water model, numerical models, and experimental data
verify the results of the 3D Step Model for several bathymetries, with the Analytic S/R
Model verified by a numerical model for breaking wave conditions. Modeled
equilibrium planforms landward of bathymetric anomalies indicate the importance of the
longshore transport coefficients with either erosion or shoreline advancement possible for
several cases presented.
xx
CHAPTER 1
INTRODUCTION AND MOTIVATION
Irregular and unexpected shoreline planforms adjacent to nearshore borrow areas
have increased awareness of the wave field modification caused by bathymetric
anomalies such as borrow pits or shoals. When a wave field in a region of generally
uniform depth encounters a bathymetric anomaly the wave field is modified through
wave refraction, wave diffraction, wave reflection and wave dissipation, with the first
three known collectively as scattering. These four wave transformation processes result
in a modified wave field that propagates towards, and eventually impacts, the shoreline.
The modified wave field will alter the longshore transport leading to a shoreline planform
that is held to an artificial equilibrium.
Case studies such as the beach nourishment projects at Grand Isle, Louisiana, and
Anna Maria Key, Florida, have shown the possible effects of a nearshore borrow area on
the adjacent shoreline planform. The ability to predict, and possibly design for, the
equilibrium planform in the vicinity of a bathymetric anomaly requires a better
understanding of both the wave and sediment processes near the anomaly. The focus of
this report is to better understand the wave field modifications caused by bathymetric
anomalies, of both twodimensional and threedimensional forms, with results providing
the foundation for study on the sediment transport processes and shoreline changes
induced.
1
2
Several studies including field and laboratory scales have been conducted to
investigate this issue. These studies examined the wave transformation over a
bathymetric anomaly with the shoreline changes caused by the altered wave field.
Earlier, dating back to the early 1900s, the focus was on the modification of a wave train
encountering a change in bathymetry, which was solved using analytic methods. This
early research included development of analytical solutions for bathymetric changes in
the form of a step, or a pit, first of infinite length (in one horizontal dimension; 2D
models), and, more recently, of finite dimensions (in two horizontal dimensions; 3D
models). The complexity of the 3D models has advanced from a pit/shoal with vertical
sidewalls and uniform depth surrounded by water of uniform depth, which can be solved
analytically, to domains with arbitrary bathymetry that are solved using complex
numerical schemes. Some models combine the calculation of the wave transformation
and resulting shoreline change, whereas others perform the wave calculations separately
and rely on a different program for shoreline evolution.
1.1 Motivation
Changes in offshore bathymetry modify the local wave field, thus causing an
equilibrium planform that may be altered significantly from the previous, relatively
straight shoreline. Not only can a bathymetric change cause wave transformation, but
also may change the sediment transport dynamics by drawing sediment into it from the
nearshore or by intercepting the onshore movement of sediment. Knowledge of wave
field modifications and the resulting effects on sediment transport and shoreline evolution
is essential in the design of beach nourishment projects and other engineering activities
that alter offshore bathymetry.
3
Beach nourishment has become the preferred technique to address shoreline
erosion. In most beach nourishment projects, the fill placed on the eroded beach is
obtained from borrow areas located offshore of the nourishment site. The removal of
large quantities of fill needed for most projects can result in substantial changes to the
offshore bathymetry through the creation of borrow pits or by modifying existing shoals.
The effect of the modified bathymetry in the borrow area on the wave field and the
influence of the modified wave field on the shoreline can depend on the incident wave
conditions, the nourishment sediment characteristics and some features of the borrow
area including the location, size, shape and orientation.
The large quantities of sediment used in beach nourishment projects combined
with the increase in the number of projects constructed, and an increased industrial need
for quality sediment have, in many areas, led to a shortage of quality offshore fill material
located relatively near to the shore. This shortage has increased interest in the mining of
sediment deposits located in Federal waters, which fall under the jurisdiction of the
Minerals Management Service (MMS). Questions have been raised by the MMS
regarding the potential effects on the shoreline of removing large quantities of sediment
from borrow pits lying in Federal waters (Minerals Management Service, 2003).
A better understanding of the effects of altering the offshore bathymetry is
currently needed. The scattering processes of wave refraction, diffraction, and reflection
modify the wave field in a complex manner dependent on the local wave and nearshore
conditions. A more complete understanding and predictive capability of the effect of
bathymetric changes to the wave field and the resulting shoreline modification leading to
less impactive design of dredge pit geometries should be the goal of current research.
4
1.2 Models Developed and Applications
A better understanding of the wave field near bathymetric anomalies can be
obtained through models that more accurately represent their shapes and the local wave
transformation processes. The models developed in this study extend previous analytic
methods to better approximate the natural domain and extend the problem from the
offshore region to the shoreline. By meshing a model constrained by a uniform depth
requirement outside of the bathymetric anomaly to a nearshore model with a sloped
bottom, linear waves can be propagated from the offshore over the anomaly and into the
nearshore where shoaling and refraction lead to wave breaking and sediment transport. A
longshore sediment transport model can then predict the shoreline changes resulting from
the wave field modified by the bathymetric anomaly.
Previous analytic 3D models and all of the previous 2D models, with the
exception of Dean (1964) and Lee et al. (1981), have domains that contain abrupt
transitions in depth (vertical sidewalls) for the bathymetric anomaly. A more realistic
representation of natural bathymetric anomalies should allow for gradual transitions
(sloped sidewalls). The focus of the present study is the propagation of water waves over
a 2D (trench or shoal) or 3D (pit or shoal) bathymetric anomaly of more realistic
geometry and the wave transformation they induce.
Three solution methods are developed for a 2D domain with linear water waves
and normal wave incidence: (1) the 2D step method, (2) the slope method and (3) a
numerical method. The 2D step method is valid in arbitrary water depth while the slope
method and the numerical method are valid only for shallow water conditions. The step
method is an extension of the Takano (1960) solution as modified by Kirby and
Dalrymple (1983a) that allows for a trench or shoal with stepped transitions that
5
approximate a specific slope or shape. The slope method is an extension of the Dean
(1964) solution that allows for linear transitions between the changes in bathymetry for a
trench or shoal creating regular or irregular trapezoids. The numerical method employs a
backward spacestepping procedure for arbitrary (but shallow water) bathymetry with the
transmitted wave specified. The 2D models are compared against each other, with the
results of Kirby and Dalrymple (1983a) and with the numerical model FUNWAVE 1.0
[1D] (Kirby et al., 1998).
For a 3D domain, an analytic solution to the wave field modification caused by
bathymetric anomalies with sloped transitions in depth is developed. This solution is an
extension of previous work for anomalies with abrupt depth transitions in regions of
otherwise uniform depth that employs steps to approximate a gradual transition in depth.
A shallow water analytic solution is also developed, which is valid for specific sidewall
slope and pit size combinations. The 3D models are validated with the laboratory data
of Chawla and Kirby (1996), the numerical models REF/DIF1 (Kirby and Dalrymple,
1994) and FUNWAVE 1.0 [2D] (Kirby et al., 1998), and the numerical model of
Kennedy et al. (2000) and through direct comparisons.
The application of the different models to realworld problems depends on the
situation of interest. The study of 2D models can demonstrate the reflection caused by
long trenches or shoals of finite width such as navigation channels and underwater
breakwaters, respectively. The 3D models can be employed to study problems with
variation in the longshore and nonoblique incidence. Wave related quantities such as
energy flux and wave direction are calculated and indicate the influence of the
bathymetric anomaly. The wave heights and directions for transects located shoreward of
6
the anomaly are combined with an analytic shoaling and refraction method to determine
the wave propagation in a nearshore zone of arbitrary slope. The longshore transport and
shoreline evolution are also calculated for the nearshore (shoaled and refracted) wave
field that occurs shoreward of the anomaly. Through the methods developed in this study
the wave transformation, energy reflection, longshore transport, and shoreline evolution
induced by a 3D bathymetric anomaly with gradual transitions in depth can be
investigated.
CHAPTER 2
LITERATURE REVIEW
Several methods have been employed to quantify the impact on the shoreline
caused by changes in the offshore bathymetry including case studies, field experiments,
analytical developments, numerical models, and laboratory studies. The intriguing
behavior of the shoreline following beach nourishment projects at Grand Isle, Louisiana,
Anna Maria Key, Florida, and Martin County, Florida, have led to questions and
investigations regarding the impact of the significant offshore borrow areas present in
each case.
Field studies have been used to investigate the impact of offshore dredging in
relatively deeper water to attempt to define a depth at which bathymetric changes will not
induce significant wave transformation. Laboratory experiments have documented wave
transformations caused by changes in the bathymetry and the resulting effects on the
shoreline in controlled settings possible only in the laboratory.
Solutions for wave transformation by changes in the bathymetry are outlined
primarily in chronological order following the development from analytical solutions for
long waves in one horizontal dimension (2D) through numerical models for arbitrary
bathymetry that include many waverelated nearshore processes in 3 dimensions.
Modeling of shoreline responses due to wave field modification from changes in offshore
bathymetry is examined with models that include both wave field and shoreline changes
and by coupling models that evaluate these processes independently. The wave
7
8
transformation processes included in nearshore models are important factors in the
capability to predict a salient leeward of a pit, the shoreline responses observed in the
limited laboratory experiments and at Grand Isle, Louisiana.
2.1 Case Studies
2.1.1 Grand Isle, Louisiana (1984)
The beach nourishment project at Grand Isle, Louisiana, provides one of the most
interesting, and well publicized examples of an irregular planform resulting from the
effects of a large borrow area lying directly offshore. One year after the nourishment
project was completed, two large salients, flanked by areas of increased erosion,
developed immediately shoreward of the offshore borrow area. Combe and Solieau
(1987) provide a detailed account of the shoreline maintenance history at Grand Isle,
Louisiana, specifications of the beach nourishment project that was completed in 1984,
and details of the shoreline evolution in the two years following completion.
The project required 2.1xl06 m3 of sediment with approximately twice this
amount dredged from an area lying 800 m from the shore (Combe and Soileau, 1987) in
4.6 m of water (Gravens and Rosati, 1994). The dredging resulted in a borrow pit that
was dumbbell shaped in the planform with two outer lobes dredged to a depth of 6.1 m
below the bed, connected by a channel of approximate 1,370 m length dredged to 3.1 m
below the bed (Combe and Soileau, 1987). The salients seen in Figure 21 started to
form during storm events that occurred during the winter and spring of 1984/85 (Combe
and Soileau, 1987).
By August 1985 the salients and associated areas of increased erosion were
prominent features on the shoreline. An aerial survey of the area that was completed by
the New Orleans District of the Army Corps of Engineers and the Coastal Engineering
9
Research Center concluded that the size and location of the borrow area were such that its
presence could affect the local wave climate (Combe and Soileau, 1987). Oblique aerial
photography identified the diffraction of the wave field as a result of the borrow area
(Combe and Soileau, 1987). The area of increased erosion near the salients was found to
affect 25% of the project length and amounted to about 8% of the neat project volume
(Combe and Soileau, 1987, pg. 1236).
Figure 21: Aerial photograph showing salients shoreward of borrow area looking East
to West along Grand Isle, Louisiana, in August, 1985 (Combe and Solieau, 1987).
Three major hurricanes impacted the project area in the hurricane season
following the projects completion, the first time that three hurricanes struck the
Louisiana coastline in the same season (Combe and Soileau, 1987). While these storms
did tremendous damage to the newly formed berm and caused large sediment losses, the
location and size of the salients remained relatively unchanged. The salients have
remained on the Grand Isle shoreline as shown by an aerial photograph from 1998
10
(Figure 22). It appears that the eastern salient has decreased in size while the western
salient has remained the same size or even become larger.
Figure 22: Aerial photograph showing salients shoreward of borrow area along Grand
Isle, Louisiana, in 1998 (modified from Louisiana Oil Spill Coordinator's Office
(LOSCO), 1999).
A series of detached offshore breakwaters was constructed along the eastern part of
Grand Isle in the 1990s, which terminate at the eastern salient and may have affected its
shape.
Bathymetric surveys taken through the borrow area in February 1985 and August
1986 revealed that the outer lobes had filled to about half their original depth and the
channel connecting the lobes had reached the sea bed elevation (Combe and Soileau,
1987). Currently, the borrow area is reported to be completely filled by fine material
11
(Combe, personal correspondence) which would have required the same approximate
volume of sediment that was dredged for the initial placement. Although the origin of the
sediment that has refilled the borrow pit is not known, it is reported to be finer than the
sediment dredged for the nourishment project, indicating that the material did not
originate from the project. While no longer a bathymetric anomaly, the borrow areas are
reported to continue to modify the wave field as local shrimpers use the waters shoreward
of the pit as a harbor to weather storms. The reason for the sheltering effect of the filled
pit may be due to the energydissipating characteristic of the finer material that has filled
the pit.
2.1.2 Anna Maria Key. Florida (1993)
The 1993 beach nourishment project at Anna Maria Key, Florida, is another
example of a project with a large borrow area lying offshore in relatively shallow water.
The project placed l.xlO6 m3 of sediment along a 6.8 km segment (DNR Monuments R
12 to R35*) of the 11.6 km long barrier island (Dean et al., 1999). The borrow area for
the project was approximately 3,050 m long and ranged from 490 to 790 m offshore in
approximately 6 m of water (Dean et al., 1999). A planview of the bathymetry near the
project including the borrow area is shown in Figure 23. A transect through the borrow
area, indicated in the previous figure at Monument R26, is shown in Figure 24 and
shows dredging to a depth of 3.1 m below the local seabed. This figure shows one pre
project transect, a transect immediately following completion, and two postnourishment
transects. The postnourishment transects indicate minimal infilling of the borrow pit.
The DNR Monuments are permanent markers spaced at approximately 300 m along
the Florida sandy beaches for surveying purposes
12
The shoreline planform was found to show the greatest losses shoreward of the
borrow area. Figure 25 shows the shoreline position relative to the August, 1993, data
for seven different periods. A large area of negative shoreline change indicating erosion
is found from DNR Monument numbers 25 to 34 for the July, 1997, and February, 1998,
data. This area lies directly shoreward of the borrow area shown in Figure 23. The
behavior of the shoreline directly leeward of the borrow area is seen to be the opposite of
the Grand Isle, Louisiana, response where shoreline advancement occurred.
Volume changes determined from profiles in the project area did not show large
negative values near the southern end of the project. The difference between the
shoreline and volume changes at the southern end of the project implies that the
constructed profiles may have been steeper near the southern end of the project as
compared to those near the northern end (Wang and Dean, 2001).
The proximity of the borrow area to the shoreline is one possible contribution to
the local erosion. Although the reason for the increased erosion in this area is not clear, it
is interesting that the anomalous shoreline recession did not occur until the passage of
Hurricanes Erin and Opal in August and October, 1995, respectively. Hurricane Opal
was a category 4 hurricane with sustained winds of 67 m/s when it passed 600 km west of
Manatee County (Liotta, 1999). A reported storm surge of 0.3 to 1.0 m, combined with
the increased wind and wave action, resulted in overtopping of the beach berm, flooding
of the back area of the project and transport of sediment to the back beach or offshore
(Liotta, 1999). The average shoreline retreat for the project area was approximately 9.1
to 15.2 m, based on observations (Liotta, 1999).
13
Passage Key Inlet
Figure 23: Bathymetry off Anna Maria Key, Florida, showing location of borrow pit
following beach nourishment project (modified from Dean et al., 1999).
Elevation (m)
14
Distance from Monument (m)
Figure 24: Beach profile through borrow area at R26 in Anna Maria Key, Florida
(modified from Wang and Dean, 2001).
Figure 25: Shoreline position for Anna Maria Key Project for different periods relative
to August, 1993 (modified from Dean et al. 1999).
15
2.1.3 Martin County, Florida (1996)
The Hutchinson Island beach nourishment project in Martin County, Florida was
constructed in 1996 with the placement of approximately l.lxlO6 m3 of sediment along
6.4 km of shoreline, between DNR Monuments Rl and R25 (Sumerell, 2000). The
borrow area for this project was a shoal rising 4.9 m above the adjacent bed and lying 910
m offshore in 12.8 m of water (Sumerell, 2000). Figure 26 shows the borrow area
location offshore of the southern end of the project area. An average of 3 m of sediment
was dredged from the central portion of the shoal.
Figure 26: Project area for Martin County beach nourishment project (Applied
Technology and Management, 1998).
The 3year and 4year postnourishment shoreline surveys show reasonable
agreement with modeling conducted for the project, except at the southern end, near the
borrow area (Sumerell, 2002). Figure 27 shows the predicted shoreline and the survey
16
data for the 4year shoreline change. This case differs from the previous two as the
borrow area did not create a pit but reduced the height of an offshore shoal. By lowering
the height of the shoal the shoreline leeward of the borrow area was exposed to greater
wave action, which is the opposite of the sheltering (through reflection) effect of an
offshore pit. The borrow area, with its large extent and proximity to the project, is a
possible reason for the higher than expected erosion at the southern end of the project.
Figure 27: Fouryear shoreline change for Martin County beach nourishment project:
predicted versus survey data (modified from Sumerell, 2000).
2.2 Field Experiments
Field studies have been conducted to examine the effects of offshore dredging on
the coastal environment. The purposes of the these studies have varied and include the
tendency of a dredged pit to induce sediment flows into it from the nearshore, the
interception of sediment transport, and wave transformation effects of a newly dredged
pit on the shoreline.
17
2.2.1 Price et al. (1978)
Price et al. (1978) investigated the effect of offshore dredging on the coastline of
England. The tendency of a dredge pit to cause a drawdown of sediment and to prevent
the onshore movement of sediment was investigated. The study by Inman and Rusnak
(1956) on the onshoreoffshore interchange of sand off La Jolla, California, was cited.
This threeyear study found vertical bed elevation changes of only +/ 0.03 m at depths
greater than 9 m. Based on the consideration that the wave conditions off the southern
coast of England would be less energetic than off La Jolla, California, Price et al. (1978)
concluded that beach drawdown at a depth greater than 10 m would not occur.
A radioactive tracer experiment off Worthing, on the south coast of England, was
performed to investigate the mobility of sediment at depths of 9, 12, 15, and 18 m. The
20month study found that at the 9 and 12 m contours there was a slight onshore
movement of sediment and it was concluded that the movement of sediment beyond a
depth contour of 18 m on the south coast of England would be negligible. Therefore, at
these locations and in instances when the onshore movement of sediment seaward of the
dredge area is a concern, dredging in water beyond 18 m depth below low water level
was considered acceptable (Price et al., 1978).
A numerical model of the shoreline change due to wave refraction over dredged
holes was also employed in the study, the details of which will be examined later in
Section 2.5.2.1. The model found that minimal wave refraction occurred for pits in
depths greater than 14 m for wave conditions typical off the coast of England.
2.2.2 Kojima et al. (19861
The impact of dredging on the coastline of Japan was studied by Kojima et al.
(1986). The wave climate as well as human activities (dredging, construction of
18
structures) for areas with significant beach erosion and/or accretion was studied in an
attempt to determine a link between offshore dredging and beach erosion. The study area
was located offshore of the northern part of Kyushu Island. The wave climate study
correlated yearly fluctuations in the beach erosion with the occurrence of both storm
winds and severe waves and found that years with high frequencies of storm winds were
likely to have high erosion rates. A second study component compared annual variations
in offshore dredging with annual beach erosion rates and found strong correlation at some
locations between erosion and the initiation of dredging although no consistent
correlation was identified.
Hydrographic surveys documented profile changes of dredged holes over a four
year period. At depths less than 30 m, significant infilling of the holes was found, mainly
from the shoreward side, indicating a possible interruption in the longshore and offshore
sediment transport. This active zone extends to a much larger depth than found by Price
et al. (1978) and by Inman and Rusnak (1956). The explanation by Kojima et al. is that
although the active onshore/offshore region does not extend to 30 m, sediment from the
ambient bed will fill the pit causing a change in the supply to the upper portion of the
beach and an increase in the beach slope. Changes in the beach profiles at depths of 35
and 40 m were small, and the holes were not filled significantly.
Another component of the study involved tracers and seabed level measurements
to determine the depths at which sediment movement ceases. Underwater photographs
and seabed elevation changes at fixed rods were taken at 5 m depth intervals over a
period of 3 months during the winter season for two sites. The results demonstrated that
sediment movement at depths up to 35 m could be significant. This depth was found to
19
be slightly less than the average depth (maximum 49 m, minimum 20 m) for five
proposed depth of closure equations using wave inputs with the highest energy
(H = 4.58 m, T = 9.20 s) for the 3month study period.
2.3 Laboratory Experiments
2.3.1 Horikawa et al. (1977)
Laboratory studies have been carried out to quantify wave field and nearshore
modifications due to the presence of offshore pits. Horikawa et al. (1977) performed
wave basin tests with a model of fixed offshore bathymetry and uniform depth containing
a rectangular pit of uniform depth and a nearshore region composed of moveable
lightweight sediments. The experimental arrangement is shown in Figure 28. The
incident wave period and height were 0.41 s and 1.3 cm, respectively. With the pit
covered, waves were run for 5.5 hours to obtain an equilibrium planform followed by
wave exposure for three hours with the pit present. Shoreline measurements were
conducted at 1 hour intervals to determine the pit induced changes.
400
300
200
100
0
1
1
' I
5
\
, J
30 hole
Â£:: beach .
1
1
4 5
. 1
Shoreline/
I
*
O
c
ro
11
O
X
tn
cr
c
o
(unit.cm)
MILITE v
Swi ?
00
300 200 100
Offshore distance
 20
i o
Figure 28: Setup for laboratory experiment (Horikawa et al., 1977).
20
The results of the experiment are presented in Figure 29. Almost all of the
shoreline changes with the pit present occurred in the first two hours. At the still water
level, a salient formed shoreward of the pit, flanked by two areas of erosion that generally
extend to the sidewalls of the experiment; however, the depth contour at a water depth, h
= 0.85 cm, also shown in Figure 29, shows only a slightly seaward displacement at the
pit centerline.
Figure 29: Results from laboratory experiment showing plan shape after two hours
(Horikawa et al., 1977).
2,3.2 Williams (2002)
Williams (2002) performed wave basin experiments similar to those of Horikawa
et al. (1977). The experimental setup of a fixed bed model containing a pit with a
moveable sand shoreline was constructed for similar trials by Bender (2001) and was a
larger scale version of the Horikawa et al. (1977) arrangement. The Williams
experimental procedure consisted of shoreline, bathymetric, and profile measurements
after specified time intervals that comprised a complete experiment. Figure 210 shows
the experiment progression sequence that was used. For analysis, the shoreline and
21
volume measurements were made relative to the last measurements of the previous 6
hour phase. The conditions for the experiments were 6 cm waves with 1.35 s period and
a depth of 15 cm in the constant depth region surrounding the pit. The pit was 80 cm
long in the crossshore direction, 60 cm in the longshore direction and 12 cm deep
relative to the adjacent bottom.
Complete Experiment
Previous Test
Phases
(open pit)
Current Control
Phases
(covered pit)
Current Test
Phases
(open pit)
Next Control
Phases
(covered pit)
I I
1 1
6.0 7.5 9.0 0.0 1.5 3.0 6.0 7,5 9.0 12.0 1.5 3.0 6.0
02.0) (0.0)
Tine Step (Hours)
Figure 210: Experiment sequence timeline for Williams laboratory experiments
(Williams, 2002)
Shoreline and volume change results were obtained for three experiments. Figure
211 shows the volume change per unit length versus longshore distance for results with
pit covered (control phase) and uncovered (test phase). The dashed line represents
volume changes for a covered pit relative to the time step zero which concluded 6 hours
of waves with the pit uncovered. The solid line shows the change with the pit uncovered
relative to time step six when six hours of wave exposure with the pit covered ended.
The volume change results show the model beach landward of the pit lost volume at
almost every survey location during the period with the pit covered and experienced a
gain in volume with the pit uncovered.
22
 0 to 6 Hours 1 ~6 to 12 Hours
(pit covered) (pit present)
Figure 211: Volume change per unit length tor tirst experiment (Williams, 2002).
The net volume change for the first complete experiment (control and test phase)
was approximately 2500 cm3. Different net volume changes were found for the three
experiments. However, similar volume change per unit length results were found in all
three experiments indicating a positive volumetric relationship between the presence of
the pit and the landward beach.
The shoreline change results showed shoreline retreat, relative to Time Step 0.0,
in the lee of the borrow pit during the control phase (pit covered) for all three
experiments with the greatest retreat at or near the centerline of the borrow pit. All three
experiments showed shoreline advancement in the lee of the borrow pit with the pit
uncovered (test phase). With the magnitude of the largest advancement being almost
equal to the largest retreat in each experiment, it was concluded that, under the conditions
tested, the presence of the borrow pit resulted in shoreline advancement for the area
shoreward of the borrow pit (Williams, 2002).
An evenodd analysis was applied to the shoreline and volume change results in
an attempt to isolate the effect of the borrow pit. The even function was assumed to
represent the changes due solely to the presence of the borrow pit. The even components
23
were adjusted to obtain equal positive and negative areas, which were not obtained using
the laboratory data. For each experiment, the shifted even results shoreward of the pit
showed positive values during the test phase for both the shoreline and volume changes
with negative values during the control phase. The shifted even component of shoreline
change for the first experiment is shown in Figure 212. These results further verify the
earlier findings concerning the effect of the pit.
o
~ 0 to 6 Hours 6 to 12 Hours
(pit covered) (pit present)
Figure 212: Shifted even component of shoreline change for first experiment (Williams,
2002).
2.4 Wave Transformation
2.4.1 Analytic Methods
There is a long history of the application of analytic methods to determine wave
field modifications by bathymetric changes. Early research centered on the effect on
normally incident long waves of an infinite step, trench or shoal of uniform depth in an
otherwise uniform depth domain. More complex models were later developed to remove
the long wave restriction, add oblique incident waves and allow for the presence of a
24
current. More recently, many different techniques have been developed to obtain
solutions for domains containing pits or shoals of finite extent. Some of these models
focused solely on the wave field modifications, while others of varying complexity
examined both the wave field modifications and the resulting shoreline impact.
2 A. 1.1 2Dimensional methods
By matching surface displacement and mass flux normal to the change in
bathymetry Lamb (1932) was one of the first to develop a long wave approximation for
the reflection and transmission of a normally incident wave at a finite step.
Bartholomeauz (1958) performed a more thorough analysis of the finite depth step
problem and found that the Lamb solution gave correct results for the reflection and
transmission coefficients for lowest order (kh) where k is the wave number and h is the
water depth prior to the step. Sretenskii (1950) investigated oblique waves over a step
between finite and infinite water depths assuming the wavelength to be large compared to
the finite depth. An extensive survey of early theoretical work on surface waves
including obstacle problems is found in Wehausen and Laitone (1960).
Kreisel (1949) developed a method that conformally mapped a domain containing
certain obstacles of finite dimensions into a rectangular strip. The reflection from
obstacles at the surface and on the bottom were considered. Kreisel (1949) presents a
proof demonstrating that the reflection coefficient is independent of the incident wave
direction for a symmetric (upwave and downwave depth equal) or asymmetric obstacle
(trench or shoal) in arbitrary water depth.
Jolas (1960) studied the reflection and transmission of water waves of arbitrary
relative depth over a long submerged rectangular parallelepiped (sill) and performed an
experiment to document the wave transformation. To solve the case of normal wave
25
incidence and arbitrary relative depth over a sill or a fixed obstacle at the surface Takano
(1960) used an eigenfunction expansion of the velocity potentials in each constant depth
region and matched them at the region boundaries. The set of linear integral equations
was solved for a truncated series. A laboratory experiment was also conducted in this
study.
Dean (1964) investigated long wave modification by linear transitions. The linear
transitions included both horizontal and vertical changes. The formulation allowed for
many domains including a step, either up or down, and converging or diverging linear
transitions with a sloped wall. A proposed solution was defined with planewaves of
unknown amplitude and phase for the incident and reflected waves with the transmitted
wave specified. Wave forms, both transmitted and reflected, were represented by Bessel
functions in the region of linear variation in depth and/or width. The unknown
coefficients were obtained through matching the values and gradients of the water
surfaces at the ends of the transitions. Analytic expressions were found for the reflection
and transmission coefficients. The results indicate that the reflection and transmission
coefficients depend on the relative depth and/or width and a dimensionless parameter
containing the transition slope, the wavelength and the depth or width (Figure 213). In
Figure 213 the parameter Z, =
4 nh,
for the case of linearly varying depth and
Z, = for linearly varying breadth where I indicates the region upwave of the
lsh
transition, Sv is equal to the depth gradient, and Sh is equal to onehalf the breadth
gradient. These solutions were shown to converge to those of Lamb (1932) for the case
of an abrupt transition (Zi=0).
26
001 002 0 05 0.1 02 OS 1 2 5 10 20 50 100 200 500 1 000
Value of hj/hjjj b^/b2^
Figure 213: Reflection and transmission coefficients for linearly varying depth [hi/hm]
and linearly varying breadth [b2/bni2] (modified from Dean, 1964).
Newman (1965a) studied wave transformation due to normally incident waves on
a single step between regions of finite and infinite water depth with an integralequation
approach. This problem was also examined by Miles (1967) who developed a plane
wave solution for unrestricted kh values using a variational approach (Schwinger &
Saxon 1968), which for this case essentially solves a single equation instead of a series of
equations (up to 80 in Newmans solution) as in the integral equation approach. The
difference between the results for the two solution methods was within 5 percent for all
kh values (Miles, 1967).
27
Newman (1965b) examined the propagation of water waves past long obstacles.
The problem was solved by constructing a domain with two steps placed back to back
and applying the solutions of Newman (1965a). Complete transmission was found for
certain water depth and pit length combinations; a result proved by Kriesel (1949).
Figure 214 shows the reflection coefficient, Kr, and the transmission coefficient, Kt,
versus Kodio where K is the wave number in the infinitely deep portion before the
obstacle and h0 is the depth over the obstacle. The experimental results of Takano (1960)
are included for comparison. It is evident that the Takano experimental data included
energy losses.
Figure 214: Approximate reflection and transmission coefficients for the rectangular
parallelepiped of length 8.86h0 in infinitely deep water (Newman, 1965b).
28
The variational approach was applied by Mei and Black (1969) to investigate the
scattering of surface waves by rectangular obstacles. For a submerged obstacle, complete
transmission was found for certain kh0 values where h0 is the depth over the obstacle. A
comparison of the results of Mei and Black (1969) and those of Newman (1965b) is
shown in Figure 215, which presents the reflection coefficient versus kho for a
submerged obstacle. Data from the Jolas (1960) experiment are also included on the plot
and compared to the results of Mei and Black (1969) for a specific i / hG, where t is the
halflength of the obstacle.
0 02 04 06 08 lo 12 14 16
khQ
Figure 215: Reflection coefficient for a submerged obstacle (Mei and Black, 1969).
Black and Mei (1970) applied the variational approach to examine the radiation
caused by oscillating bodies and the disturbance caused by an object in a wave field.
Two domains were used for both submerged and semiimmersed (surface) bodies: the
first domain was in Cartesian coordinates, with one vertical and one horizontal
29
dimension, for horizontal cylinders of rectangular cross section and the second domain
was in cylindrical coordinates, for vertical cylinders of circular section. The second
domain allowed for objects with two horizontal dimensions to be studied for the first time
(see Section 2.4.1.2.). Black et al. (1971) used the variational formulation to study the
radiation due to the oscillation of small bodies and the scattering induced by fixed bodies.
Black et al. demonstrated the scattering caused by a fixed object in a single figure; see
Black and Mei (1970) for further results.
Lassiter (1972) used complementary variational integrals to solve the problem of
normally incident waves on an infinite trench where the depth on the two sides of the
trench may be different (the asymmetric case). The symmetric infinite trench problem
was studied by Lee and Ayer (1981), who employed a transform method. The fluid
domain was divided into two regions, one an infinite uniform depth domain and the other
a rectangular region representing the trench below the uniform seabed level. The
transmission coefficient for the trench is shown in Figure 216 with the theoretical results
plotted along with data from a laboratory experiment conducted as part of the study.
Results from a boundary integral method used to compare with the theoretical results are
also plotted. The results show six of an infinite number of relative wavelengths where
complete transmission (Kt=l) will occur, a result that had been found in prior studies
(Newman (1965b), Mei and Black (1969)). The laboratory data show the general trend
of the theoretical results, with some variation due to energy losses and reflections from
the tank walls and ends.
Lee et al. (1981) proposed a boundary integral method for the propagation of
waves over a prismatic trench of arbitrary shape, which was used for comparison to
30
selected results in Lee and Ayer (1981). The solution was found by matching the
unknown normal derivative of the potential at the boundary of the two regions. A
comparison to previous results for trenches with vertical sidewalls was conducted with
good agreement. A case with bathymetry containing gradual transitions in depth was
shown in a plot of the transmission coefficient for a trapezoidal trench (Figure 217).
Note that the complete dimensions of the trapezoidal trench are not specified in the inset
diagram, making direct comparison to the results impossible.
Figure 216: Transmission coefficient as a function of relative wavelength (h=10.J cm,
d=67.3 cm, trench width =161.6 cm) (modified from Lee and Ayer, 1981).
Miles (1982) solved for the diffraction by an infinite trench for obliquely incident
long waves. The solution method for normally incident waves used a procedure
developed by Kreisel (1949) that conformally mapped a domain containing certain
obstacles of finite dimensions into a rectangular strip. To add the capability of solving
31
for obliquely incident waves, Miles used the variational formulation of Mei and Black
(1969).
Figure 217: Transmission coefficient as a function of relative wavelength for
trapezoidal trench; setup shown in inset diagram (modified from Lee et al., 1981).
The problem of obliquely incident waves over an asymmetric trench was solved
by Kirby and Dalrymple (1983a) using a modified form of Takanos (1960) method.
Figure 218 compares the reflection coefficient for the numerical solution for normally
incident waves and the results of Lassiter (1972). The results from a boundary integral
method used to provide verification are included. Differences in the results of Kirby and
Dalrymple and those of Lassiter are evident. Lee and Ayer (1981,[see their Figure 2])
also demonstrated differences in their results and those of Lassiter (1972). The effect of
oblique incidence is shown in Figure 219 where the reflection and transmission
coefficients for two angles of incidence are plotted.
32
Figure 218: Reflection coefficient for asymmetric trench and normally incident waves
as a function of Khi: li2/hi=2, li3/hi=0.5, L/hi=5; L = trench width (Kirby and Dalrymple,
1983a).
Figure 219: Transmission coefficient for symmetric trench, two angles of incidence:
L/h]=10, h2/hi=2; L = trench width (modified from Kirby and Dalrymple, 1983a).
This study also investigated the planewave approximation and the longwave
limit, which allowed for comparison to Miles (1982). Figure 220 shows transmission
coefficients with the results of the numerical solution, the long wave solution, and values
from the Miles (1982) solution, which is only valid for small kh values in each region.
For the first case, with a small relative trench width, the numerical results from Kirby and
33
Dalrymple compare well with the results using the Miles (1982) method and the plane
wave solution is seen to deviate from these. For the case of a relative trench length equal
to eight, the numerical results differ from the planewave solution, which diverge from
the values using Miles (1982) for this case where the assumptions are violated.
Figure 220: Transmission coefficient as a function of relative trench depth; normal
incidence: kihi= 0.2: (a) L/hi=2; (b) L/hi=8, L = trench width. (Kirby and Dalrymple,
1983a).
The difference in scales between the two plots is noted. An extension of this
study is found in Kirby et al. (1987) where the effects of currents flowing along the
trench are included. The presence of an ambient current was found to significantly alter
34
the reflection and transmission coefficients for waves over a trench compared to the no
current case. Adverse currents and following currents made a trench less reflective and
more reflective, respectively (Kirby et al., 1987).
2.4.1.2 3Dimensional methods
Extending the infinite trench and step solutions (one horizontal dimension) to a
domain with variation in the longshore (twohorizontal dimensions) is a natural
progression allowing for the more realistic case of wave transformation by a finite object
or depth anomaly to be studied. Changes in bathymetry can cause changes in wave
height and direction through the four wave transformation processes noted earlier. Some
of the twodimensional models study only the wave transformation, while others use the
modified wave field to determine the impact of a pit or shoal on the shoreline. Several
models use only a few equations or matching conditions on the boundary of the pit or
shoal to determine the wave field and in some cases the impact on the shoreline in a
simple domain containing a pit or shoal. Other, much more complex and complete
models and program packages have been developed to solve numerically for the wave
field over a complex bathymetry, which may contain pits and/or shoals. Both types of
models can provide insight into the effect of a pit or shoal on the local wave field and the
resulting impact on the shoreline.
The wave transformation in a threedimensional domain was investigated in a
study by Black and Mei (1970), which solved for the radially symmetric case of a
submerged or floating circular cylinder in cylindrical coordinates. A series of Bessel
functions was used for the incident and reflected waves, as well as for the solution over
the shoal with modified Bessel functions representing the evanescent modes. As
mentioned previously in the 2D section, a variational approach was used and both the
35
radiation by oscillating bodies and the disturbance caused by a fixed body were studied.
The focus of the fixed body component of the study was the total scattering cross section,
Q, which is equal to the width between two wave rays within which the normally incident
wave energy flux would be equal to that scattered by the obstacle and the differential
scattering crosssection, which shows the angular distribution of the scattered energy
(Black and Mei, 1970). Figure 221 shows the total scattering cross section for a circular
cylinder at the seabed for three ratios of cylinder radius (a) to depth over the cylinder (h).
ka
Figure 221: Total scattering cross section of vertical circular cylinder on bottom
(modified from Black et al., 1971).
Williams (1990) developed a numerical solution for the modification of long
waves by a rectangular pit using Greens second identity and appropriate Greens
functions in each region that comprise the domain. This formulation accounts for the
diffraction, refraction and reflection caused by the pit. The domain for this method
36
consists of a uniform depth region containing a rectangular pit of uniform depth with
vertical sides. The solution requires discretizing the pit boundary into a finite number of
points at which the velocity potential and the derivative of the velocity potential normal
to the boundary must be determined. Applying matching conditions for the pressure and
mass flux across the boundary results in a system of equations amenable to matrix
solution techniques. Knowledge of the potential and derivative of the potential at each
point on the pit boundary allows determination of the velocity potential solution
anywhere in the fluid domain. The effect of a pit on the wave field is shown in a contour
plot of the relative amplitude in Figure 222. A partial standing wave pattern of increased
and decreased relative amplitude is seen seaward of the pit with a shadow zone of
decreased wave amplitude landward of the pit flanked by two areas of increased relative
amplitude.
McDougal et al. (1996) applied the method of Williams (1990) to the case of a
domain with multiple pits. The first part of the study reinvestigated the influence of a
single pit on the wave field for various pit geometries. A comparison of the wave field in
the presence of a pit versus a surface piercing structure is presented in Figures 223 and
224, which present contour plots of the transformation coefficient, K, (equal to relative
amplitude) that contain the characteristics discussed in the last paragraph. For this case
with the pit depth equal to 3 times the water depth a greater sheltering effect is found (K
= 0.4) landward of the pit than for the case of the full depth breakwater.
An analysis of the effect of various pit characteristics on the minimum value of K
found in the domain was also performed. The dimensionless pit width, a/L, (a = cross
shore dimension, L = wave length outside pit) was found to increase the distance to the
37
region where K < 0.5 behind the pit and the value of K was found to decrease and then
become approximately constant as a/L increases. The minimum values of the
transformation coefficient for a wide pit are much lower than those values found in Lee
and Ayer (1981) and Kirby and Dalrymple (1983a), which maybe explained by the
refraction divergence that occurs behind the pit in the 2D case (McDougal et al., 1996).
Figure 222: Contour plot of relative amplitude in and around pit for normal incidence;
kj/d = 7t/l 0, k2/h=7r/10V2, h/d=0.5, b/a =1, a/d=2, a = crossshore pit length, b =
longshore pit length, h = water depth outside pit, d = depth inside pit, L2 = wavelength
outside pit. (Williams, 1990).
38
The effect of the dimensionless pit length, b/L, indicates that K decreases as b/L
increases to 1 with a change in the trend, and an increase in K, from b/L = 0.55 to b/L =
0.65. Increasing the dimensionless pit depth, d/L, was found to decrease the minimum
value of K with a decreasing rate. The incident wave angle was not found to significantly
alter the magnitude or the location of the minimum K value, although the width of the
shadow zone changes with incident angle. For the case of multiple pits, it was found that
placement of one pit in the shadow zone of a more seaward pit was most effective in
reducing the wave height. However, adding a third pit did not produce significant wave
height reduction as compared to the twopit results.
Williams and Vazquez (1991) removed the long wave restriction of Williams
(1990) and applied the Greens function solution method outside of the pit. This solution
was matched to a Fourier expansion solution inside the pit with matching conditions at
the pit boundary. Once again the pit boundary must be discretized into a finite number of
points and a matrix solution for the resulting series of equations was used. Removing the
shallow water restriction allowed for many new cases to be studied, as the wave
conditions approach deep water, the influence of the pit diminishes. A plot of the
minimum and maximum relative amplitude found in the domain versus the dimensionless
pit length (the wave number outside of the pit times the crossshore pit dimension, koa) is
shown in Figure 225. The maximum and minimum relative amplitudes in Figure 225
are seen to occur near k0a = 2tt or when L = a and then approach unity as the
dimensionless pit length increases. The reason that the extreme values do not occur
exactly at l^a = 2n is explained by Williams and Vazquez (1991) as due to diffraction
effects near the pit modifying the wave characteristics.
39
Figure 223: Contour plot of diffraction coefficient in and around pit for normal
incidence; a/L=l, b/L=0.5, d/h =3, kh=0.167 (McDougal et al., 1996).
Figure 224: Contour plot of diffraction coefficient around surfacepiercing breakwater
for normal incidence; a/L=l, b/L=0.5, kh=0.167 (McDougal et al., 1996).
40
Figure 225: Maximum and minimum relative amplitudes for different koa, for normal
incidence, a/b=6, a/d=7i, and d/h=2. (modified from Williams and Vasquez, 1991).
2.4.2 Numerical Methods
The previous threedimensional solutions, while accounting for most of the wave
transformation processes caused by a pit, are simple in their representation of the
bathymetry and their neglect of many waverelated processes including energy
dissipation. Berkhoff (1972) developed a formulation for the 3dimensional propagation
of waves over an arbitrary bottom in a vertically integrated form that reduced the problem
to twodimensions. This solution is known as the mild slope equation and different forms
of the solution have been developed into parabolic (Radder, 1979), hyperbolic, and
elliptic (Berkhoff et al., 1982) models of wave propagation, which vary in their
approximations and solution techniques. Numerical methods allow solution for wave
propagation over an arbitrary bathymetry. Some examples of the parabolic and elliptic
41
models are RCPWAVE (Ebersole et al., 1986), REF/DIF1 (Kirby and Dalrymple, 1994),
and MIKE 21s EMS Module (Danish Hydraulics Institute, 1998). Other models such as
SWAN (Holthuijsen et al., 2000) and STWAVE (Smith et al., 2001) model wave
transformation in the nearshore zone using the waveaction balance equation. These
models provide the capability to model wave transformation over complicated
bathymetries and may include processes such as bottom friction, nonlinear interaction,
breaking, wavecurrent interaction, windwave growth, and white capping to better
simulate the nearshore zone. An extensive review of any of the models is beyond the
scope of this paper; however, a brief outline of the capabilities of some of the models is
presented in Table 1.
Maa et al. (2000) provides a comparison of six numerical models. Two parabolic
models are examined: RCPWAVE and REF/DIF1. RCPWAVE employs a parabolic
approximation of the elliptic mild slope equation and assumes irrotationality of the wave
phase gradient. REF/DIF1 extends the mild slope equation by including nonlinearity
and wavecurrent interaction (Kirby and Dalrymple, 1983b; Kirby, 1986). Of the four
other models included, two are defined by Maa et al. (2000) as based on the transient
mild slope equation (Copeland, 1985; Madsen and Larson, 1987) and two are classified
as elliptic mild slope equations (Berkhoff et al., 1982) models.
The transient mild slope equation models presented are Mike 21 s EMS Module
and the PMH Model (Hsu and Wen, in review). The elliptic mild slope equation models
use different solution techniques with the RDE Model (Maa and Hwung, 1997; Maa et al.
1998a) applying a special Gaussian elimination method and the PBCG Model employing
a Preconditioned Biconjugate Gradient method (Maa et al., 1998b).
42
Table 21: Capabilities of selected nears
lore wave mode
s.
RCPWAVE
REF/DIF1
Mike 21 ~ EMS
STWAVE
SWAN ~ 3rd Gen.
Solution
Method
Parabolic
Mild Slope
Equation
Parabolic
Mild Slope
Equation
Elliptic Mild
Slope Equation
(Berkhoff et al.
(1972)
Conservation
of Wave
Action
Conservation
of Wave
Action
Phase
Averaged
Resolved
Resolved
Averaged
Averaged
Spectral
No
No
Use REF/DIFS
No
Use NSW unit
Yes
Yes
Shoalinq
Yes
Yes
Yes
Yes
Yes
Refraction
Yes
Yes
Yes
Yes
Yes
Diffraction
Yes
(SmallAngle)
Yes
(WideAngle)
Yes
(Total)
No
(Smoothing)
No
Reflection
No
Yes
(Forward only)
Yes
(Total)
No
Yes
(Specular)
Breakina
Stable Energy
Flux: Dally et
al. (1985)
Stable Energy
Flux: Dally et al.
(1985)
Bore Model:
Battjes &
Janssen (1978)
Depth limited:
Miche (1951)
criterion
Bore Model:
Battjes & Janssen
(1978)
White
caooina
No
No
No
Resio (1987)
Komen et al. (1984),
Janssen (1991),
Komen et al. (1994)
Bottom
Friction
No
Dalrymple et al.
(1984) both
laminar and
turbulent BBL
Quadratic
Friction Law,
Dingemans
(1983)
No
Hasselmann et al.
(1973), Collins
(1972), Madsen et
al. (1988)
Currents
No
Yes
No
Yes
Yes
Wind
No
No
No
Resio (1988)
Cavaleri &
MalanotteRizzoli
(1981), Snyder et al.,
(1981), Janssen et
al. (1989, 1991)
Availability
Commercial
Free
Commercial
Free
Free
43
A table in Maa et al. (2000) provides a comparison of the capabilities of the six
models. A second table summarizes the computation time, memory required and, where
required, the number of iterations for a test case of monochromatic waves over a shoal on
an incline; the Berkhoff et al. (1982) shoal. The parabolic approximation solutions of
REF/DIF and RCPWAVE required significantly less memory (up to 10 times less) and
computation time (up to 70 times less) than the elliptic models, which is expected due to
the solution techniques and approximations contained in the parabolic models. The
required computation times and memory requirements for the transient mild slope
equation models were found to be intermediate to the other two methods.
Wave height and direction were calculated in the test case domain for each model.
The models based on the transient mild slope equation and the elliptic mild slope
equation were found to produce almost equivalent values of the wave height and
direction. The parabolic approximation models were found to have different values, with
RCPWAVE showing different wave heights and directions behind the shoal and
REF/DIF showing good wave height agreement with the other methods, but no change in
the wave direction behind the shoal. Plots of the computed wave heights for the six
models and experimental data along one transect taken perpendicular to the shoreline and
one transect parallel to the shoreline are shown in Figures 226 and 227. Only four
results are plotted because the RDE model, the PMH model and PBCG model produced
almost identical results.
The wave directions found with REF/DIF1 in Maa et al. (2000) were found to be
in error by Grassa and Flores (2001), who demonstrated that a second order parabolic
44
model, equivalent to REF/DIF1 was able to reproduce the wave direction field behind a
shoal such as in the Berkhoff et al. (1982) experiment.
Figure 226: Comparison of wave height profiles for selected models along transect
parallel to shore located 9 m shoreward of shoal apex[=experimental data] (Maa et al.,
2000).
Figure 227: Comparison of wave height profiles for selected models along transect
perpendicular to shore and through shoal apex [^experimental data] (Maa et al., 2000).
45
Application of numerical models to the problem of potential impact on the
shoreline caused by changes to the offshore bathymetry was conducted by Maa and
Hobbs (1998) and Maa et al. (2001). In Maa and Hobbs (1998) the impact on the coast
due to the dredging of an offshore shoal near Sandbridge, Virginia was investigated using
RCPWAVE. National Data Buoy Center (NDBC) data from an offshore station and
bathymetric data for the area were used to examine several cases with different wave
events and directions. The resulting wave heights, directions, and sediment transport at
the shoreline were compared. The sediment transport was calculated using the
formulation of Gourlay (1982), which contains two terms, one driven by the breaking
wave angle and one driven by the gradient in the breaking wave height in the longshore
direction. Section 2.5.4 provides a more detailed examination of the longshore transport
equation with two terms. The study found that the proposed dredging would have little
impact on the shoreline for the cases investigated.
Later, Maa et al. (2001) revisited the problem of dredging at the Sandbridge Shoal
by examining the impact on the shoreline caused by three different borrow pit
configurations. RCPWAVE was used to model the wave transformation over the shoal
and in the nearshore zone. The focus was on the breaking wave height; wave direction at
breaking was not considered. The changes in the breaking wave height modulation
(BHM) along the shore after three dredging phases were compared to the results found
for the original bathymetry and favorable or unfavorable assessments were provided for
ensuing impact on the shoreline. The study concluded that there could be significant
differences in the wave conditions, revealed by variations in the BHM along the shoreline
depending on the location and extent of the offshore dredging.
46
Regions outside the inner surf zone have also been studied through application of
nearshore wave models. Jachec and Bosma (2001) used the numerical model REF/DIFS
(a spectral version of REF/DIF1) to study borrow pit recovery time for seven borrow
areas located on the inner continental shelf off New Jersey. The input wave conditions
were obtained from Wave Information Study (WIS) data with nearshore bathymetry for
the existing conditions and also different dredging scenarios. Changes in the wave
induced bottom velocity were obtained from the wave height and direction changes
determined by REF/DIFS. The waveinduced bottom velocities were coupled with
ambient nearbottom currents to determine the sediment transport and then recovery
times of the borrow areas. The recovery times from the numerical modeling were the
same order of magnitude as recovery times estimated from two independent data sets of
seafloor change rates offshore of New Jersey.
2.5 Shoreline Response
2.5.1 Longshore Transport Considerations
The previous discussion on one and twodimensional models focused first on
simple and complex methods of determining the wave transformation caused by changes
in the offshore bathymetry and then applications that determined the changes to the wave
height, direction and even longshore transport at the shoreline. However, none of the
applications were intended to determine the change in shoreline planforms due to an
anomaly or a change in the offshore bathymetry. With wave heights and directions
specified along the shoreline, sediment transport can be calculated and, based on the
gradients in longshore transport, the changes in shoreline position can be determined.
The longshore transport can be driven by two terms as was discussed previously
in the review of Maa and Hobbs (1998). In most situations where the offshore
47
bathymetry is somewhat uniform, the magnitude and direction of the longshore transport
will depend mostly on the wave height and angle at breaking as the longshore gradient in
the breaking wave height will be small. In areas with irregular bathymetry or in the
presence of structures, the transformation of the wave field can lead to areas of wave
focusing and defocusing resulting in considerable longshore gradients in the wave height.
Longshore transport equations containing a transport term driven by the breaking wave
angle and another driven by the longshore gradient in the wave height can be found in
Bakker (1971), Ozasa and Brampton (1980), who cite the formulation of Bakker (1971),
Gourlay (1982), Kraus and Harikai(1983), and Kraus (1983). While the value of the
coefficient for the transport term driven by the gradient in the wave height is not well
established, the potential contribution of this term is significant. It is shown later that
under steady conditions the diffusive nature of the angledriven transport term is required
to modify the wave height gradient transport term in order to generate an equilibrium
planform when the two terms are both active.
2.5.2 Refraction Models
2.5.2.1 Motyka and Willis (1974)
Motyka and Willis (1974) were one of the first to apply a numerical model to
predict shoreline changes due to altered offshore bathymetry. The model only included
the effect of refraction caused by offshore pits for idealized sand beaches representative
of those found on the English Channel or North Sea coast of England. A simplified
version of the Abemethy and Gilbert (1975) wave refraction model was used to
determine the transformation of uniform deep water waves over the nearshore
bathymetry. The breaking wave height and direction were calculated and used to
determine the sediment transport and combined with the continuity equation to predict
48
shoreline change. The longshore transport was calculated using the Scripps Equation as
modified by Komar (1969):
Q =
0.045 2 /'/o \
pg Hb Cg sin(2fc)
(21)
where Q is the volume rate of longshore transport, ys is the submerged unit weight of the
beach material, p is the density of the fluid, Hb is the breaking wave height, Cg is the
group velocity at breaking, and oq, is the angle of the breaking wave relative to the
shoreline. This form of the Scripps Equation combines the transport and porosity
coefficients into one term; the values used for either parameter was not stated. This
process was repeated to account for shoreline evolution with time.
Figure 228 shows a comparison of the predicted shorelines for the equivalent of
two years of waves over 1 m and 4 m deep pits with a longshore extent of 880 m and a
crossshore extent of 305 m. The detailed pit geometries were not specified.
C
O
H
4J
*H
CO
O
cu
c
Q)
M
0
Xt
w
10
30
20
to
0
to
WATER DEPTH (m)
DISTANCE OFFSHORE (m)
17 08
270
17 62
3050
Pit depth = 1
m
_ Pit depth = 4
m
_ i i 1
500 1000 1500 2000 2500 3000 3500 000 500
DISTANCE ALONG SHOREm
PLANSHAPE OF BEACH
DUE TO REFRACTION OVER DREDGED HOLE. 270 m OFFSHORE
Figure 228: Calculated beach planform due to refraction after two years of prototype
waves for two pit depths (modified from Motyka and Willis, 1974).
49
The model determined that erosion occurs shoreward of a pit, with adjacent areas
of accretion. For the wave conditions used, stability was found after an equivalent period
of two years. During the runs, storm waves (short period and large wave height) were
found to cause larger shoreline changes than the normal waves with longer periods and
smaller heights, which actually reduced the erosion caused by the storm waves. The
erosion shoreward of the pits is shown in Figure 228 with more erosion occurring for the
deeper pit.
2.5.2.2 Horikawa et al. (1977)
Horikawa et al. (1977) developed a mathematical model for shoreline changes due
to offshore pits. The model applies a refraction program and the following equation for
the longshore sediment transport:
= O.llpg 2 sin(2 j (22)
\6(psp)(\A) s
where X is the porosity of the sediment. Equation 22 is identified as the Scripps
Equation in Horikawa et al. (1977); however, to match the Scripps Equation and for a
dimensionally correct expression, the g term in the numerator should be removed. A
model by Sasaki (1975) for diffraction behind breakwaters was modified to account for
refraction only. The model computes successive points along the wave ray paths.
Interpolation for the depth and slope is used along the ray path with an iteration
procedure to calculate each successive point. The wave conditions were selected to be
typical of the Eastern Japan coast facing the Pacific Ocean. Several pit dimensions and
pit locations were used with the longshore dimension of the pit ranging from 2 km to 4
km, a crossshore length of 2 km, pit depth of 3 m and water depths at the pit from 20 m
to 50 m.
50
For the configurations modeled, accretion was found directly shoreward of the pit,
flanked by areas of erosion. The magnitude of the accretion behind the pit and the
erosion in the adjacent areas were found to increase with increasing longshore pit length
and for pits located closer to shore. The shoreline planform for a model after the
equivalent of 2 years of waves is shown in Figure 229 with a salient directly shoreward
of the pit.
Longshore distance from center of dredged hole (km)
Figure 229: Calculated beach planform due to refraction over dredged hole after two
years of prototype waves (Horikawa et al., 1977).
Although Horikawa et al. state that good qualitative agreement was found with
Motyka and Willis (1974), the results were the opposite with Horikawa et al. and Motyka
and Willis (1974) predicting accretion and erosion shoreward of a pit, respectively. The
proposed reason for the accretion given in Horikawa et al. was that sand accumulates
behind the pit due to the quiet water caused by the decrease in wave action behind the pit.
However, a model that considers only refraction caused by a pit and only includes a
transport term dependent on the breaking wave angle would have wave rays that diverge
over the pit and cause sand to be transported away from the area behind the pit, resulting
51
in erosion. The two models used different refraction programs and basically the same
transport equation with Horikawa et al. having a pit that was 2 or 3 times as large, lying
in deeper water and with longer period incoming waves. The refraction grid was 250 m
square in the Horikawa et al. model and 176 m square in Motyka and Willis.
Regardless of the differing results from Motyka and Willis, the mathematical
model results of Horikawa et al. follow the trend of the lab results contained in that study
showing accretion behind a pit (Figure 230); however, the aforementioned anomalous
prediction of accretion considering only wave refraction remains.
Longshore distance from center
of dredged hole ( cm )
Figure 230: Comparison of changes in beach plan shape for laboratory experiment and
numerical model after two years of prototype waves (Horikawa et al., 1977).
2.5.3 Refraction and Diffraction Models
2.5.3.1 Gravens and Rosati (1994)
Gravens and Rosati (1994) performed a numerical study of the salients and a set
of offshore breakwaters at Grand Isle, Louisiana (Figures 21 and 22). Of particular
interest is the analysis and interpretation of the impact on the wave field and the resulting
52
influence on the shoreline, of the dumbbell shaped planform borrow area located close
to shore. The report employs two numerical models to determine the change in the
shoreline caused by the presence of the offshore pits: a wave transformation numerical
model (RCPWAVE) and a shoreline change model (GENESIS (Hanson, 1987, Hanson,
1989)) using the wave heights from the wave transformation model. RCPWAVE was
used to calculate the wave heights and directions from the nominal 12.8 m contour to the
nominal 4.3 m contour along the entire length of the island for 3 different input
conditions. Figures 231 and 232 show the wave height transformation coefficients and
wave angles near the pit (centered about alongshore coordinate 130). Significant changes
in the wave height and direction are found near the offshore borrow area. The shadow
zone centered at Cell 130 suggests the presence of one large offshore pit as opposed to
the dumbbell shaped borrow pit for the project described in Combe and Soileau (1987).
The shoreline changes were calculated using a longshore transport equation with
two terms; one driven by the breaking wave angle, and one driven by the longshore
gradient in the breaking wave height. Each of these terms includes a dimensionless
transport coefficient. In order for GENESIS to produce a salient leeward of the borrow
pit, an unrealistically large value for the transport coefficient associated with the gradient
in the breaking wave height (K2 = 2.4) was needed, whereas 0.77 is the normal upper
limit. While a single salient was modeled after applying the large K2 value, the
development of two salients leeward of the borrow pit, as shown in Figures 21 and 22,
did not occur. The nearshore bathymetric data used in the modeling was from surveys
taken in 1990 and 1992. Significant infilling of the borrow pit occurred prior to the
53
surveys in 1990 and 1992; however, details of how the pit filled over this time period are
not known.
Nearshore Wave Height Transformation Coefficients
Figure 231: Nearshore wave height transformation coefficients near borrow pit from
RCPWAVE study (modified from Gravens and Rosati, 1994).
100 110 120 130 140 ISO 160
Alongshore Coordinate (cell spacing 100 ft)
Figure 232: Nearshore wave angles near borrow pit from RCPWAVE study; wave
angles are relative to shore normal and are positive for westerly transport (modified from
Gravens and Rosati, 1994).
54
The authors proposed that the salient was formed by the refractive divergence of the
wave field created by the borrow pit that resulted in a region of low energy directly
shoreward of the borrow area and regions of increased energy bordering the area. The
gradient in the wave energy will result in a circulation pattern where sediment mobilized
in the highenergy zone is carried into the low energy zone. For GENESIS to recreate
this circulation pattern K2 must be large enough to allow the second transport term to
dominate over the first transport term.
2.53.2 Tang (2002)
Tang (2002) employed RCPWAVE and a shoreline modeling program to evaluate
the shoreline evolution leeward of an offshore pit. The modeling was only able to
generate embayments in the lee of the offshore pits using accepted values for the
transport coefficients. This indicates that wave reflection and/or dissipation are
important wave transformation processes that must be included when modeling shoreline
evolution in areas with bathymetric anomalies.
2.5.4 Refraction. Diffraction, and Reflection Models
2.5.4.1 Bender (2001)
A study by Bender (2001) extended the numerical solution of Williams (1990) for
the transformation of long waves by a pit to determine the energy reflection and shoreline
changes caused by offshore pits and shoals. An analytic solution was also developed for
the radially symmetric case of a pit following the form of Black and Mei (1970). The
processes of wave refraction, wave diffraction, and wave reflection are included in the
model formulations, however, wave dissipation is not. Both the numerical and analytic
solutions provide values of the complex velocity potential at any point, which allows
determination of quantities such as velocity and pressure.
55
The amount of reflected energy was calculated by comparing the energy flux
through a transect perpendicular to the incident wave field extending to the pit center to
the energy flux through the same transect with no pit present (Figure 233). The amount
of energy reflected was found to be significant and dependent on the dimensionless pit
diameter and other parameters. Subsequently a new method has been developed which
allows the reflected energy to be calculated using a farfield approximation with good
agreement between the two methods.
0.26
0.24
0.22 
0.2 
5 0.18
0)
o
0.16
Pit Diameter/Wavelength(inside pit,d)
.0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
Â£ 0.14
Id
q:
0.12
0.1
0.08
0.06
A
*
+
+
+
+
0
d1
+ (radius = 6 m)
o (radius = 12 m)
* (radius = 25 m)
x (radius = 30 m)
<> (radius = 75 m)
o0
O 0
0.5 1 1.5 2
Pit Diameter/Wavelength(outside pit,h)
2.5
Figure 233: Reflection coefficients versus dimensionless pit diameter divided by
wavelength inside and outside the pit; water depth = 2 m, pit depth = 4 m (Bender, 2001).
The shoreline changes caused by the pit were calculated using a simple model that
considers continuity principles and the longshore transport equation with values of the
wave height and direction determined along a transect representing the shoreline. A
nearshore slope and no nearshore refraction were assumed. The impact on the shoreline
56
was modeled by determining the wave heights and directions along an initially straight
shoreline, then calculating the transport and resulting shoreline changes. After updating
the shoreline positions, the transport, resulting shoreline changes, and updated shoreline
positions were recalculated for a set number of iterations after which the wave
transformation was recalculated with the new bathymetry and values of the wave height
and direction were updated at the modified breaker line.
The impact on the shoreline was found to be highly dependent on the transport
coefficients. Considering transport driven only by the breaking wave angle and wave
height, erosion was found to occur directly leeward of the pit flanked by two areas of
accretion as in Motyka and Willis (1974). Following an initial advancement directly
shoreward of the pit, erosion occurs and an equilibrium shape was reached. Examining
only the effect of the second transport term (driven by the longshore gradient in the wave
height) accretion was found directly shoreward of the pit, with no equilibrium planform
achieved. Figure 234 shows the shoreline evolution for each transport term. Including
both transport terms with the same transport coefficients resulted in a shoreline with
accretion directly shoreward of the pit that was able to reach an equilibrium state
(Figure 235). The twoterm transport equation used to determine the shoreline in Figure
235 is
Q =
K,H2b5JgK sm{0ab)cos(0ab) K2II;5fK cos(0
ab ) dH
8(s iX1^)
8(5lXlp)tan(/w) dy
(23)
where Hb is the breaking wave height, g is gravity, at is the breaking index, 0is the
shoreline orientation, a is the breaking wave angle, m is the beach slope, s and p are the
specific gravity and porosity of the sediment, respectively, and KÂ¡ and K2 are sediment
57
transport coefficients, which were set equal to 0.77 for the results presented here. A
review of the development of Eq. 23 is contained in Appendix D.
First Transport Term (wave angle)
79.5 80 80.5 81
Shoreline Position (m)
Figure 234: Shoreline evolution resulting from each transport term individually for
transect located 80 m shoreward of a pit with a radius = 6 m, last time step indicated with
[+] (modified from Bender and Dean, 2001).
In application the wave height and angle calculations were limited to a uniform depth
region; therefore no nearshore shoaling and refraction was performed to resolve the depth
limited breaking values. The wave height and angle values at the transect location
representing the shoreline were assumed to be the values at breaking; this limitation is
removed in the model developed in Section 6.10.
In these figures the water depth and pit depth were 2 m and 4 m, respectively, the
period was 10 s, the incident wave height was 1 m, and averaging over 5 wave directions
was used to smooth out the longshore variation in the wave height at large distances from
the pit. The time step was 120 s and 10 iterations of shoreline change were calculated
between wave height and direction updates for a total modeling time of 48 hours. The
58
diffusive nature of the angledriven transport term is seen to modify the much larger
wave height gradient transport term in order to generate an equilibrium planform when
the two terms are used together. Comparison of these results with those described earlier
establishes the significance of wave reflection and the second transport term on the
equilibrium planform.
Full Transport Equation (both terms)
Figure 235: Shoreline evolution using full transport equation and analytic solution model
for transect located 80 m shoreward of a pit with a radius = 6 m, last time step indicated
with [+] (modified from Bender and Dean, 2001).
CHAPTER 3
2DIMENSIONAL MODEL THEORY AND FORMULATION
3.1 Introduction
The reflection and transmission of normally incident waves by twodimensional
trenches and shoals of finite width with sloped transitions between the depth changes are
studied. Prior twodimensional studies, outlined in Chapter 2, have all investigated the
interaction of water waves with changes in bathymetry that have featured domains with
an abrupt transition, with the exception of Dean (1964) and Lee et al. (1981). A more
realistic representation of natural trenches and shoals should allow for gradual transitions
(sloped sidewalls).
The focus of the 2dimensional study is the propagation of water waves over a
2D trench or shoal of more realistic geometry. This will extend the study of Dean
(1964) that investigated long wave modification by a sloped step and Lee et al. (1981),
which did not directly address the effect of the transition slope on the reflection and
transmission coefficients. Three solution methods are developed for linear water waves:
(1) the step method, (2) the slope method and (3) a numerical method. The step method
is valid in arbitrary water depth while the slope method and the numerical method are
valid only for shallow water conditions. The step method is an extension of the Takano
(1960) eigenfunction expansion solution as modified by Kirby and Dalrymple (1983a)
that allows for a trench or shoal in arbitrary depth with stepped transitions that
approximate a specific slope or shape. The slope method extends the long wave solution
59
60
of Dean (1964) that allows for linear transitions between the changes in bathymetry for a
trench or shoal creating regular or irregular trapezoids. The numerical method employs a
backward spacestepping procedure for arbitrary (but shallow water) bathymetry with the
transmitted wave specified.
3.2 Step Method: Formulation and Solution
The twodimensional motion of monochromatic, smallamplitude water waves in
an inviscid and irrotational fluid of arbitrary depth is investigated. The waves are
normally incident and propagate in an infinitely long channel containing a two
dimensional obstacle (trench or shoal) of finite width. Details of the fluid domain and the
formulation of the solution vary depending on the case studied: abrupt transition or
gradual transition with the slope approximated by the step method.
The step method is an extension of the Takano (1960) formulation for the
propagation of waves over a rectangular sill. The eigenfunction expansion method of
Takano (1960) was extended in Kirby and Dalrymple (1983a) to allow for oblique wave
incidence and again in 1987 by Kirby et al. to include the effects of currents along the
trench. In the present formulation the method of Takano, as formulated in Kirby and
Dalrymple (1983a), was generally followed for normal wave incidence.
The solution starts with the definition of a velocity potential:
<Â¡>j(x,z,t) = (f>j(x,z)eiat (y = i_>j) (31)
where j indicates the region, J is the total number of regions (3 for the case of a trench or
sill with an abrupt transition), and ct is the angular frequency. The velocity potential
must satisfy the Laplace Equation:
61
f d1
5 2 '\
+ 
ydx2 dz j
c,z)=0
(32)
the freesurface boundary condition:
5^(x,z) cr2
dz
+ = 0
g
(33)
and the condition of no flow normal to any solid boundary:
d(x,z)
5n
= 0
(34)
The velocity potential must also satisfy radiation conditions at large x.
The boundary value problem defined by Eq. 32, the boundary conditions of Eqs.
33 and 34, and the radiation condition can be solved with a solution in each region of
the form
, , COsh[&(/t. + z)\ ik [x) r / K.(XX.)
tj(x,z)=Aj e ]K)+Y.Bj,n^AKjAhj+zh jA
cos
n=1
0 = 1 >j), (n = 1 >o) (35)
In the previous equation Ai+ is the incident wave amplitude coefficient, Af is the
reflected wave amplitude coefficient and A/ is the transmitted wave amplitude
coefficient. The coefficient B is an amplitude function for the evanescent modes
( = 1 co) at the boundaries, which are standing waves that decay exponentially with
distance from the boundary. The values of the wave numbers of the propagating modes,
kj, are determined from the dispersion relation:
a2 = gkj tanh(*,h/) ( j = 1 ^ j)
and the wave numbers for the evanescent modes, kJiP are found from
(36)
62
cr2 = gKjn tan(Kjnhj) O' 1 > J), {n = 1 > qo) (37)
In each region a complete set of orthogonal equations over the depth is formed by Eqs. 3
5 to 37.
To gain the full solution, matching conditions are applied at each boundary
between adjacent regions. The matching conditions ensure continuity of pressure:
f(* = x,),(/ = l*Vl) (38)
and continuity of horizontal velocity normal to the vertical boundaries:
d, d+.
V+1
(* = *,) O' = !>/!)
(39)
dx dx
The matching conditions are applied over the vertical plane between the two regions:
( hj hj+l.
In order to form a solution, one wave form in the domain must be specified,
usually the incident or the transmitted wave. Knowing the value of the incident, reflected
and transmitted wave amplitudes, the reflection and transmission coefficients can be
calculated from
a,
K aT cosh0>y)
T a, coshO,/;,)
(310)
(311)
where the cosh terms account for the change in depth at the upwave and downwave ends
of the trench/shoal for the asymmetric case. A convenient check of the solution is to
apply conservation of energy considerations:
KÂ¡ +
( \
aT
2
1
a
i
\ai j
i
JS
i
= 1
(312)
63
where nÂ¡ is the ratio of the group velocity to the wave celerity:
(
nj = 2
1 +
2k M:
J J
sinh(2kjhj)
(313)
3.2.1 Abrupt Transition
The solution of Takano (1960) for an elevated sill and that of Kirby and
Dalrymple (1983a) for a trench are valid for abrupt transitions (vertical walls) between
the regions of different depth. For these cases the domain is divided into three regions (J
= 3) and the matching conditions are applied over the two boundaries between the
regions. The definition sketch for the case of a trench with vertical transitions is shown
in Figure 31 where W is the width of the trench.
'll
%
tit
x2
I
1 Region 1
"J if
iRegion 2
Region 3
W
Figure 31: Definition sketch for trench with vertical transitions.
Takano constructed a solution to the elevated sill problem by applying the
matching conditions [Eqs. 38 and 39] for a truncated series (n = 1 N) of
eigenfunction expansions of the form in Eq. 35. Applying the matching conditions
results in a truncated set of independent integral equations each of which is multiplied by
the appropriate eigenfunction; cosh[kj(hj+z)] or cos[Kj,n(hj+z)]. The proper eigenfunction
to use depends on whether the boundary results in a step down or a step up; thereby
64
making the form of the solution for an elevated sill different than that of a trench. With
one wave form specified, the orthogonal properties of the eigenfunctions result in 4N+4
unknown coefficients and a closed problem.
By applying the matching conditions at the boundary between Regions 1 and 2
(x = xi), 2N+2 integral equations are constructed. For the case of a trench with vertical
transitions (Figure 31) the resulting equations are of the form
^1(x,,z)cosh[^1(/i1 + z)]dz = jV2(x,,z) cosh [Â£,(/!, +z )\dz
(314)
u u
JViC*)>z)cos[/c,(/?, + z)]cfc = J^2(jc,,z)cos[k1)I(/i1 +z)]dz {n = \ N) (315)
0 p\i 0 p\l
[ ^(x,, z) cosh[A:2 (h2 + z)\dz [ (jc, z) cosh[&2 (h2 + z)]jz
1 dx dx
~h\ ~h\
0 P)sk
= [ (*, z) cosh[A:2 (h2 + z)]dz
r dx
(316)
J JTz) cosk, {K + z)]dz = J ~^{x,, z) cos[/r2 (h2 + z)]dz
d2
^ L \ /J I /s
. ox i ox
1 I
= j ^(*1. Z) cos[/c2 (h2 + z)]dz
i ox
(/I = 1 >W)(317)
The limits of integration for the right hand side in Eqs. 316 and 317 are shifted from ht
to h2 as there is no contribution to the horizontal velocity for ( h2 < z </?,) at x = X\
and ( h2 < z <h3) at x = x2, for this case. In Eqs. 314 and 315 the limits of
integration for the pressure considerations are ( /z, < z < 0) at x = xi and ( h3 < z < O)
at x = x2.
At the boundary between Regions 2 and 3 the remaining 2N+2 equations are
developed. For the case of a trench the downwave boundary is a step up, which
65
requires different eigenfunctions to be used and changes the limits of integrations from
the case of the step down at the upwave boundary [Eqs. 314 to 317].
0 0
jV2 (x2, z) cosh[k3 (/?3 + z)]dz = ^3 (x2, z) cosh[k3 (h3 + z)]i/z (318)
h3 h,
0 0
J^2(x2,z)cos[/c3;,(/3+z)]/z= J^(x2,z)cos[/c3;i(/23+z)]jz (w = l>A) (319)
h3 ~h3
f ^(x2, z) cosh[&2 (h2 + z)]dz = f ^(x2, z) cosh[&2 (h2 + z)\dz (320)
i dx i dx
j^(x2,z)cos[K2n(h2 + z)]/z = J~z~~(x2z)cos[/c2n(h2 + z)]i/z ( = 1 > 7V)(321)
, ox ox
h2 n3
At each boundary the appropriate evanescent mode contributions from the other
boundary must be included in the matching conditions. The resulting set of simultaneous
equations may be solved as a linear matrix equation. The value of N (number of non
propagating modes) must be large enough to ensure convergence of the solution. Kirby
and Dalrymple (1983a) found that N = 16 provided adequate convergence for most
values of kihi.
3.2.2 Gradual Transition
The step method is an extension of the work by Takano (1960) and Kirby and
Dalrymple (1983a) that allows for a domain with a trench or sill with gradual transitions
(sloped sidewalls) between regions. Instead of having a step down and then step up
as in the Kirby and Dalrymple solution for a trench or the reverse for Takanos solution
for an elevated sill, in the step method a series of steps either up or down are connected
by a constant depth region followed by a series of steps in the other direction. A sketch
66
of a domain with a stepped trench is shown in Figure 32. In this method, as in the case
of a trench or a sill, a domain with J regions will contain Jl steps and boundaries.
Figure 32: Definition sketch for trench with stepped transitions.
Each region will have a specified depth and each boundary between regions will have a
specified x location where the matching conditions must be applied.
At each boundary the matching conditions are applied and depend on whether the
boundary is a step up or a step down. With the incident wave specified, a set of
equations with 2(J1)N+2(J1) unknown coefficients is formed.
The resulting integral equations are of the form: for (j = 1 J 1)
if ( hj > hj+l) at x = Xj then the boundary is a step down;
0
jj(xj.z)cosh[fcy (hj + z)] dz = J'
hÂ¡ ^
o 0
jV, (Xj, z) cos[x"y n (h. + z)]dz = \(f>j+x (Xj, z) cos[icJ n (hj + z)]dz (n = 1 ^ N)(323)
hj hj
^(jCy,Z)C0Sh^'+1^+1 +z)]Jz= Z)cosh[^+I[hj+i +z)]dz(324)
~hj hj+i
67
J .*) cosh+u (a,+i + z)]dz = j z) cos[^, [hM + zfldz
Ay ~*y+i
(/j = 1 > N) (325)
if ( hj < ~hj+l) at x = xj then the boundary is a step up;
0
jV, (Xj, Z) cosh[^.+1 (hj+l + z)]dz = jV,+1 (xy, z) cosh[fc,.+1 (/t,+1 + z)]dz (326)
~^j+i ~hj+\
0 0
\, (Xj, Z) cos[/c.+ln (hJ+[ + z)]dz = J^.+1 (x,, z) cos[ify+I (/j,+1 + z)]dz
Ay+i Ay+i
(m = 1 A) (327)
J z) cosh[^ (hj + z)]i/z = J z) cosh^ (/?y. + z)]i/z (328)
~hj ~hj+1
j ^(*y,z) cos[/ey. (a; + z)] dz = J ~^ixj > z) cos[/c; (/z, + z)] dz
*y *y+l
( = 1 > A) (329)
At each boundary (xj) the appropriate evanescent mode contributions from the
adjacent boundaries (xj_i, Xj+i) must be included in the matching conditions. The
resulting set of simultaneous equations is solved as a linear matrix equation with the
value of N large enough to ensure convergence of the solution.
3.3 Slope Method: Formulation and Solution
The slope method is an extension of the analytic solution by Dean (1964) for long
wave modification by linear transitions. Linear transitions in the channel width, depth,
and both width and depth were studied. The solution of Dean (1964) is valid for one
linear transition in depth and/or width, which in the case of a change in depth allowed for
an infinite step, either up or down, to be studied. In the slope method a domain with two
linear transitions allows the study of obstacles of finite width with sloped transitions.
The long wave formulation of Dean (1964) for a linear transition in depth was
followed. By combining the equations of continuity and motion the governing equation
of the water surface for long wave motion in a channel of variable crosssection can be
developed. The continuity equation is a conservation of mass statement requiring that the
net influx of fluid into a region during a time, At, must be equal to a related rise in the
water surface, r. For a channel of uniform width, b, this can be expressed as
[Q(.x) Q(x + Ax)]At = bAx[ri(t + At) ^(t)]
(330)
where Q(x) and Q(x+Ax) are the volume rates of flow into and out of the control volume,
respectively. The volume flow rate for the uniform channel can be expressed as the
product of the cross sectional width, A, and the horizontal velocity, u, in the channel:
Q = Au
(331)
By substituting Eq. 331 into Eq. 330 and expanding the appropriate terms in
their Taylor series while neglecting higher order terms, Eq. 330 can be rewritten as
(332)
The hydrostatic pressure equation is combined with the linearized form of Eulers
equation of motion to develop the equation of motion for small amplitude, long waves.
The pressure field, p(x,y,t), for the hydrostatic conditions under long waves is
p{x,z,t) = pg[rÂ¡(x,t)z\
(333)
Eulers equation of motion in the x direction for no body forces and linearized motion is
69
The equation of motion for small amplitude, long waves follows from combining Eqs. 3
33 and 334:
dr/ _du
** dx dt
(335)
The governing equation is developed by differentiating the continuity equation [Eq. 332]
with respect to t:
d_
dt
d A \ kdrl
(Au) b
dx dt
d_
dx
du
~dt
= b
d\_
dt2
(336)
and inserting the equation of motion [Eq. 335] into the resulting equation, Eq. 336
yields the result
g
dx
drj
dx
= b
d2rj
dt2
(337)
Eq. 337 is valid for any small amplitude, long wave form and expresses q as a function
of distance and time. Eq. 337 can be further simplified under the assumption of simple
harmonic motion:
i(ot+a)
Ti(x,t) = T]] (x)e
where a is the phase angle. Eq. 337 can now be written as
(338)
g_d_
b dx
bh
drj
dx
+ (t2t] = 0
(339)
where the subscript qi(x) has been dropped and the substitution, A = bh, was made.
3.3.1 Single Transition
The case of a channel of uniform width with an infinitely long step either up or
down was a specific case solved in Dean (1964). The definition sketch for a step down
is shown in Figure 33. The three regions in Figure 33 have the following depths:
70
Region 1, x < x,; h = hx
(340)
Region 2, xx < x < x2; h = h3
(341)
x2
Region 3, x > x2; h = h3
(342)
Figure 33: Definition sketch for linear transition.
For the regions of uniform depth, Eq. 339 simplifies to
r)2
ghY + cr2T] = 0 (343)
ox
2 JZ
which has the solution for r\ of cos(kx) and sin(kx) where k = and A. is the wave
length. The most general solution of r(x,t) from Eq. 343 is
?)(x, t) = B] cos(kx at + a,) + B2 cos(kx + ot + a2) (344)
The wave form of Eq. 344 consists of two progressive waves of unknown amplitude and
phase: an incident wave traveling in the positive x direction and a reflected wave
traveling in the negative x direction.
For the region of linearly varying depth, Eq. 341 is inserted in Eq. 339 resulting
in a Bessel equation of zero order:
71
(345)
where
fi =
a'x
(346)
8h 3
The solutions of r(x) for Eq. 345 are
ti(x) = J0(2/3U2x'12) and Y0(2J3U2xu1)
(347)
where Jo and Y0 are zeroorder Bessel functions of the first and second kind, respectively.
From Eq. 347 the solutions for q(x,t) in Region 2 follow
T](x,t) = B3 J0(2j3U2xU2)cos(cTt + a3) + BiY0(2j3',2xV2)sin((Tt + a3)
+ B4J0(2J3U2xU2)cos(c7t+a4)BJ0(2j3U2xU2)sm((7t + a4)
The wave system of Eq. 348 consists of two waves of unknown amplitude and phase;
one wave propagating in the positive x direction (B3) and the other in the negative x
direction (B4).
The problem described by Figure 33 and Eqs. 344 and 348 contains eight
unknowns: B_y4 and ai_>4. Solution to the problem is obtained by applying matching
conditions at the two boundaries between the three regions. The conditions match the
water surface and the gradient of the water surface:
T1J=nJ+1 atx = Xj 0=1,2)
(349)
0 U)
(350)
72
Eqs. 349 and 350 result in eight equations (four complex equations), four from
71
setting at = 0and four from setting at which can be solved for the eight
unknowns as a linear matrix equation.
3.3.2 Trench or Shoal
The slope method is an extension of the Dean (1964) solution that allows for a
domain with a trench or a sill with sloped transitions. Two linear transitions are
connected by a constant depth region by placing two solutions from Dean (1964) back to
back. A trench/sill with sloped side walls can be formed by placing a step down
upwave/downwave of a step up. The definition sketch for the case of a trench is shown
in Figure 34.
In the slope method the depths are defined as follows
Region 1, x < xx; hhx
(351)
Region 2, x,
(352)
Region 3, x2 < x < x3; h = h3
(353)
Region 4, x3 < x < x4; h = h3 s2(xx3)
(354)
Region 5, x > x4; h = h5
(355)
where hi, h3, h5, sj, s2, and W are specified. With the new definition for the depth in
0.2
regions 2 and 4, the definition of the coefficient P in Eq. 345 changes to J3 and
8si
P = in regions 2 and 4, respectively.
gs 2
73
w
Figure 34: Definition sketch for trench with sloped transitions.
The matching conditions of Eqs. 349 and 350 are applied at the four boundaries
between the regions. With the transmitted wave specified and by setting at = 0and
n
at = for each matching condition a set of 16 independent equations is developed.
Using standard matrix techniques the eight unknown amplitudes and eight unknown
phases can then be determined.
The reflection and transmission coefficients can be determined from
Kr = ^and Kt=^~ (356), (357)
a, a,
Conservation of energy arguments in the shallow water region require
Kl +Kl
4K
4k
= 1
(358)
This method can be extended to the representation of long wave interaction with
any depth transition form represented by a series of line segments.
74
3.4 Numerical Method: Formulation and Solution
A numerical method was developed to determine the long wave transformation
caused by a trench or shoal of arbitrary, but shallow water bathymetry. A transmitted
wave form in a region of constant depth downwave of the depth anomaly is the specified
input to the problem. Numerical methods are used to space step the wave form
backwards over the trench or shoal and then into a region of constant depth upwave of the
depth anomaly where two wave forms exist; an incident wave and a reflected wave.
As in the long wave solution of Section 3, the continuity equation and the
equation of motion are employed to develop the governing equation for the problem.
The continuity equation and the equation of motion in the x direction are written in a
slightly different form than in Eqs. 332 and 335 of Section 3.3:
dji
dt
d(L
dx
gh2^
dx dt
(359)
(360)
Taking the derivative of Eq. 359 with respect to t and the derivative of Eq. 360
with respect to x results in the governing equation for this method:
d~T) d~ij dh drt
r~ghT~g = 0
dt2 dx2 dx dx
(361)
where the depth, h, is a function of x and p may be written as a function of x and t:
ti = r]{x)e
(362)
Inserting the form of r in Eq. 362 into the governing equation of Eq. 361 casts the
equation in a different form (equivalent to Eq. 339)
cr dx2
<7 dx dx
(363)
75
Central differences are used to perform the backward space stepping of the
numerical method.
F(x + Ax) 2F(x) + F(x Ax)
F\x) =
Ax2
F\x) =
F(x + Ax) F(x Ax)
2 Ax
(364)
(365)
Inserting the forms of the central differences into Eq. 363 for r\ results in
n(x)+
(T
tj(x + Ax) 2rj(x) + tj(x Ax)
g dh
?
1
1
5
+
i
Ax2
a2 dx
2Ax
= 0 (366)
For the backward space stepping calculation, Eq. 366 can be rearranged
2gh
T](x + Ax)
Tj(x Ax) =
gh ^ g dh 1
a2Ax2 a2 dx 2Ax
77(x)
1
gh g dh 1
(367)
cr2Ax2 a2 dx 2Ax
To initiate the calculation, values of r(x) and q(x+Ax) must be specified in the
constant depth region downwave from the depth anomaly. If the starting point of the
calculation is taken as x = 0 then the initial values may be written as
"<0)=f
H
rj(Ax) = [cos(Â£Ax) i sin(AAx)]
(368)
(369)
The solution upwave of the depth anomaly comprises of an incident and reflected
wave. The form of the incident and reflected waves are specified as
tj, = cos(kx at Â£,)
Hr
rÂ¡R = cos(kx + at eR)
(370)
(371)
76
where the ss are arbitrary phases. At each location upwave of the depth anomaly the
total water surface elevation will be the sum of the two individual components:
r\T rÂ¡Â¡ +t)r = cos (kx Â£,) cos (at) + sin(Uc Â£,) sin(at)
+ cos(kx Â£R) cos (at) sin(Ut Â£R) sin(ar)
= cos(crt)
k cos(fcc Â£,)+ cos (kx Â£r )
+ sin(at)
sin(kx Â£,) ~~ sin(fcc er)
= V/2 + II2 cos(aiÂ£*) Â£ tan"
V 1
(312)
Using several trigonometric identities, Eq. 372 can be reduced further to the form
rjT = +H\ +2HjHr cos(2kxÂ£, er ) cos(ai Â£*) (373)
which is found to have maximum and minimum values of
7rmax 2 ^i + H R)
(374)
<7r
(375)
Eqs. 374 and 375 are used to determine the values of Hi and Hr upwave of the
trench/shoal, and allow calculation of the reflection and transmission coefficients.
CHAPTER 4
3DIMENSIONAL MODEL THEORY AND FORMULATION
4.1 Introduction
The threedimensional motion of monochromatic, smallamplitude water waves in
an inviscid and irrotational fluid of arbitrary depth is investigated. The waves propagate
in an infinitely long, uniform depth domain containing a threedimensional axisymmetric
anomaly (pit or shoal) of finite extent. The addition of the second horizontal dimension
provides many new, and more practical, possibilities for study compared to the 2D
model domains, which excluded longshore variation.
Two different models are developed for the 3D domains that contain linear
transitions in depth. The analytic step method is an extension of Bender (2001) that
determines the wave transformation in arbitrary water depth for domains with gradual
transitions in depth that are approximated by a series of steps of uniform depth. The
exact analytic model solves the wave transformation in shallow water for specific
bathymetries that reduce the governing equations to known forms.
4,2 Step Method: Formulation and Solution
The step method for a threedimensional domain is an extension of the Bender
(2001) formulation for the propagation of waves past a circular anomaly with abrupt
transitions. This method allowed oblique wave incidence, but was limited to the shallow
water region. Following Bender (2001) with significant changes in notation the
governing equations for the threedimensional models are developed.
77
78
Details of the fluid domain and the formulation of the solution vary depending on
the case studied: abrupt transition in depth between regions or gradual transition with the
slope approximated by the step method. The definition sketch for the case of a circular
pit with an abrupt depth transition is shown in Figure 41.
Figure 41: Definition sketch for circular pit with abrupt depth transitions.
The domain is divided into regions with the bathymetric anomaly and its
projection comprising Regions 2>Ns+l where Ns is the number of steps approximating
the depth transition slope and the rest of the domain, of depth hi, in Region 1. For the
case of an abrupt transition in depth the bathymetric anomaly occurs in Region 2 of
uniform depth h2, where abrupt is defined as one step either down or up. For the case of
a gradual depth transition the bathymetric anomaly will be divided into subregions with
the depth in each subregion equal to hj for each step j = 2  Ns +1.
79
The solution starts with the definition of a velocity potential in cylindrical
coordinates that is valid in each Region j:
O. =R e(^.(r,0,zKto') (j = l^Ns) (41)
where u is the wave frequency.
Linear wave theory is employed and Laplaces solution in cylindrical coordinates is
valid:
dr2 r dr r2d02 dz2
where the free surface boundary condition is
dt = 0
dz g
and the bottom boundary condition is taken as
(42)
(43)
d0
dz
= 0
(44)
at z = hi in Region 1 or z = hj in Region 2.
Separation of variables is used to solve the equations with the velocity potential
given the form
A valid solution for the dependency with depth is
Z(z) = cosh(kj(hj+z)) (46)
where kj is the wave number in the appropriate region and hj is constant within each
region. Inserting Eqs. 45 and 46 into the Laplace equation gives
R"Q + R'Q + \&"R + Rek2 =0
r r
(47)

Full Text 
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WA VE TRANSFORMATION BY BATHYMETRIC ANOMALIES WITH GRADUAL TRANSITIONS IN DEPTH AND RESULTING SHORELINE RESPONSE By CHRISTOPHERJ.BENDER A DISSERTATION PRESENTED TO THE GRADUATE SCHOOL OF THE UNIVERSITY OF FLORIDA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY UNIVERSITY OF FLORIDA 2003
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ACKNOWLEDGMENTS I am truly blessed to have my wife and best friend, Kathryn, in my life. This completion of this work was made possible by her support, encouragement, and love. I am fortunate beyond measure to have her next to me as I walk life's journey Many individuals at the University of Florida have made the completion of this work possible. Dr. Robert G. Dean has not only been my major advisor but also my mentor and friend during my studies at the University of Florida. I have gained many valuable lessons from his work ethic, his character, and his tireless quest for understanding the coastal environment. I am grateful to the other members of my committee (Dr. Daniel M. Hanes, Dr. Andrew Kennedy, Dr. Ulrich H. Kurzweg, Dr. Robert J. Thieke) for their instruction and involvement during the course of my doctoral studies. I wish to thank my family ( especially Mom and Dad B, Mom and Dad Z, Caryn, John, and Kristin) and friends for their support in all my endeavors. Each of them has contributed to who I am today An Alumni Fellowship granted by the University of Florida sponsored this study with partial support from the Bureau of Beaches and Wetland Resources of the State of Florida. 11
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TABLE OF CONTENTS ACKNOWLEDGMENTS . .... . ........ ... .... . .......... . .... .... ............. . ........ .. ..... . . . . ........ .. ii LIST OF TABLES ............................................................................................................. vi LIST OF FIGURES .......... . ........ ................... .... . ............. ........ ....... .............. ......... ........ vii ABSTRACT . .......... . .......... .. . . ...... . ............. ... ...... .................. . ................ ............ . . . xix CHAPTER 1 INTRODUCTION AND MOTIVATION .................................................................. 1 1.1 Motivation ........................................................................................................... 2 1.2 Models Developed and Applications ................................................................... 4 2 LITERATURE REVIEW .. ..... ........... .............. .. ................ ........ .... .... ........... ........... 7 2.1 Case Studies ............ ............... ..... ...... ...... .... .................................... ... ... ...... .. 8 2.1.1 Grand Isle Louisiana (1984) ..................................................................... 8 2.1.2 Anna Maria Key, Florida (1993) ..... ..... ............................... ... .... .. ... ... .... 11 2.1.3 Martin County, Florida (1996) ................................................................ 15 2.2 Field Experiments ..... . ........ . ...... ........ ... .. ...................................................... 16 2.2 1 Price et al. (1978) ................................................................................... 17 2.2.2 Kojima et al. (1986) .................... .... .... . . .... ...... ...... .. . ... ...... .. ....... 17 2.3 Laboratory Experiments .................................................................................... 19 2.3.1 Horikawa et al. (1977) ........................ .............................................. ..... 19 2 3.2 Williams (2002) .............. ..... ......... ........... ........................... ................ .. . 20 2.4 Wave Transformation ..................... .. ... ................. ....................... ................. . 23 2.4.1 Analytic Methods ................................................................................... 23 2.4.1.1 2Dimensional methods ... ........... ........... ........................... ....... 24 2.4.1.2 3Dimensional methods ..................... ........................ ....... ... .... 34 2.4.2 Numerical Methods ........................................ ............. .. .. . ..................... 40 2.5 Shoreline Response ..... ........................................ .......... . . .. .. ... . ... ......... ..... .. 46 2.5.1 Longshore Transport Considerations .. ....... . ......... . .... . ................. ....... 46 2.5.2 Refraction Models ........ ..... ......... ... .. .. ..... ...... .. ..... .............. .... ......... ..... 47 2.5.2.1 Motyka and Willis (1974) .......................................................... 47 2.5.2.2 Horikawa et al. (1977) .......... .... .... . .... ............... .......... .......... .. .49 2 5.3 Refraction and Diffraction Models .... ........ ......... . ........... ........... ........ ... 51 2.5.3.1 Gravens and Rosati (1994) ........ ......... ... ............... .......... ........ ..... 51 lll
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2.5.3.2 Tang (2002) ..... . .... ... ............... .. . . .. . . .... ........ . .. ... ... .. ... ...... 54 2.5.4 Refraction Diffraction, and Reflection Models ...................................... 54 2.5.4.1 Bender (2001) ... ...... ............. . .... . ....... ............... ... . . . ... ..... ..... 54 3 2DIMENSIONAL MODEL THEORY AND FORMULATION ... .... .............. . . 59 3.1 Introduction ................. . . .. . . ...... . ............. .... . . . .... . .... .. . .... . ... . ......... ... . 59 3.2 Step Method : Formulation and Solution . ............................. .. ........................ 60 3 .2 1 Abrupt Transition ......... ........................ ...... . .... ..... ... .. ... . ... ..... ........ 63 3.2 2 Gradual Transition .... ... .. .. .. ........ ... .... ............................ . ... . . ..... ....... 65 3.3 Slope Method: Formulation and Solution .. . . . .............. .... .............. ......... .... 67 3.3.l Single Transition .. ... . . .. . . .... ... .. ...... ... ...... ....................................... 69 3.3.2 Trench or Shoal ................. .... . ... .. .... . .................... .... ............ ...... . . 72 3.4 Numerical Method : Formulation and Solution ...... . . .. . .. . .... . ........ . . . ...... .. 74 4 3DIMENSIONAL MODEL THEORY AND FORMULATION .... ............... . . . . 77 4.1 Introduction . . . . . .. . ........ ... .. ... .. ... ........ ........... . . .... .... . ........... ............ . 77 4.2 Step Method: Formulation and Solution . ...... ...... ......... ................. ... ........ . 77 4.2 1 Abrupt Transition . ............. . .... . ...... . ... ... .. . .. . . ....... .... ................... .. 81 4.2 .2 Gradual Transition .. . . . .... . . .... .. ..... .. . . .... .... ......... . . .... .. ...... ......... 85 4.3 Exact Shallow Water Solution Method : Formulation and Solution ... . ... . . .... 88 5 2DIMENSIONAL MODEL RESULTS AND COMPARISONS ........................... 92 5.1 Introduction ....................................................... ...... .. ... ......... ............ ... ......... 92 5.2 Matching Condition Evaluation ....................................... .... ..... .......... ... ... .. .... 92 5.3 Wave Transformation ..... . .... . .... ... .. . ...... . . .. ......................... . . . . ... ..... . 95 5.3.l Comparison of2D Step Model to Numerical Model FUNWAVE 1.0. 97 5.4 Energy Reflection . . ...... . .. ... . . .. ... .... ...................... .. . .. . . .... ... ....... ......... 99 5 .4.1 Comparison to Previous Results .... .................. .... . . .... ...... ... . . .......... 99 5.4.2 Arbitrary Water Depth . ...... . .... ...... ...... ............. . .... .............. ....... . . 101 5.4.3 Long Waves ...... ..... ...... ........................... .. .......... . .. . ............ ... ......... 116 6 3DIMENSIONAL MODEL RESULTS AND COMPARISONS ......................... 125 6 1 Introduction ..................................................................................................... 125 6.2 Matching Condition Evaluation . . ...... .... . ............... .. ... .... ............... ..... . ...... 126 6.3 Wave Height Modification .... .... . . .... ...... ... ................... ........ . ... .... ... ........ 127 6 3.1 Comparison of 3D Step Model and Analytic Shallow Water Exact Model . . . .. ....... .... . ... .... . ...................... . .... . ........... . ......... ... .... .. ........ .. ... 141 6.4 Wave Angle Modification ................................................................................ 144 6.5 Comparison of 3D Step Model to Numerical Models ... ............. ..... . ......... . . 147 6.5.l 3D Step Model Versus REF/DIF1 .... ........ .... . ........... ........ ....... ...... . 148 6.5.2 3D Step Model Versus 2D Fully Nonlinear Boussinesq Model.. ....... 154 6 6 Comparison to Laboratory Data of Chawla and Kirby (1996) .... . ......... ..... .... 156 6.7 Direction Averaged Wave Field Modification .... . ......... ... ........ .. ...... ....... ... .. 161 IV
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6.8 Energy Reflection . ............. ... ... .. ..... ...... . .... .... . .. ... . .. ...... ... .. .. . ... ..... . . 166 6.8.l Comparison to Prior Results . . .. .. .. .. .. .. ................ .. ..... . . ... ....... ...... 166 6.8.2 Effect of Transition Slope on Reflection ...... .. . .. ... .. . . . ........ .... . . .. 167 6.9 Analytic Nearshore Shoaling and Refraction Method ..... . .. . ... .... .. .... .. .. .. ... 171 6 9.1 Comparison of Analytic Method toREF/DIFl.. . . .. . ... .. ... ......... ... 176 6 9.2 Wave Averaged Results ...... .. .. ............. ............. ...... .... . . . . . . ...... . 183 6.10 Shoreline Evolution Model . . .... . .................. ..... .. ... .. . . .. . ...... .. .... ..... .... 185 6 10.1 Shoreline Change Estimates Shoreward of Bathymetric Anomalies. 186 6.10.2 Effect ofNearshore Form on Shoreline Change . . .. . ... .. . ... ... ... . . . 197 6 10.3 Investigation of Boundary Conditions ........... . .. . .. . . .. . . . ... . . .... .. 200 6.10.4 Investigation of Transition Slope on Shoreline Evolution ... ... ... . .. . 202 7 CONCLUSIONS AND DIRECTIONS FOR FUTURE STUDY .... ... . ............. .208 7 1 Conclusions ........ ... ............. ........ ... .. . ............ .. ...... .... ... .. .......... ............. . 208 7.2 Future Work . .. ... ... . .. ... ... .... . .. . ... .... . ... .. . .. .......... ................ ... ........... . . 211 APPENDIX A ANALYTIC WA VE ANGLE CALCULATION .. . .... . .... .. . .. .. .. .... ..... ... ....... .213 B ANALYTIC FARFIELD APPROXIMATION OF ENERGY REFLECTION . . 215 C ANALYTIC NEARSHORE SHOALING AND REFRACTION METHOD . .... . 218 D ANALYTIC SHORELINE CHANGE THEORY AND CALCULATION ........... 222 REFERENCES . .. ... . . .... .......... . .... . . . .. . . .... ...... . ............. . .. . .. ........ . . . .. ...... . . . 228 BIOGRAPHICAL SKETCH .. ... . .. ... ............... .... ... .. . .. . . . ............ . . ...... ... . . . . ..... 236 V
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LIST OF TABLES Table 2 1 Capabilit i es of selected nearshore wave models .. ... .... .... . .. . . .. . ......... ... . . . .. .42 41 Specifications for two bathymetries for exact solution method ....... . ..... ... ... .... . 91 Vl
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LIST O F FIGURES Figure 2 1 Aerial photograph showing salients shoreward of borrow area lookin g E ast to West along Grand Isle Louisiana in August, 1985 ... .... .... . ... .. ..... . ... . ......... 9 22 Aerial photograph showing salients shoreward of borrow area along Grand Isle, Louisiana, in 1998 . ... . . ............... ...... . . .. .... ... . .... . .. ... .. .......... ... ... .. . ... . 10 23 Bathymetry off Anna Maria Key Florida showing location of borrow pit followin g beach nourishment project. .. . ........ ........... . .. .. . .. . ........ ... . ... .. ..... 13 24 Beach profile through borrow area at R26 in Anna Maria Key Florid a ...... ...... .14 25 Shoreline position for Anna Maria Key Project for different periods relative to August 1993 ..................... .. . .. .......... ...... ........... . .. . .... ... .. . .... ..... ..... .. . . 14 26 Project ar e a for Martin County beach nourishment project. .... . .. .. ... .. ..... ..... ... . 15 27 Fouryear shoreline change for Martin County beach nourishment project: predicted versus survey data ..... . .. ..... .. . .. ... . .. . . .... . .. . . .. .......... ...... ............. .16 28 Setup for laboratory experiment. .... ... .. ... .... . .. . . .... .. . .... ........ ...... . .. .. ....... .19 29 Results from laboratory experiment showing plan shape after two hours ... . ... . .. 20 210 Experim e nt sequence timeline for Williams laboratory experiments ............... .... 21 211 Volume change per unit length for first experiment.. ...... ......... . . .. .................. ... 22 212 Shifted e v en component of shoreline change for first experiment. ..... .. ... .......... 23 213 Reflection and transmission coefficients for linearly varying depth [h i/ hm] and linearly varying breadth [b/lb,u2]. .. . .... .... .. ... ... .. ... ... ... ......... ... .. .. .. ........ . 26 214 Approximate reflection and transmission coefficients for the rectangular parallelepiped of length 8.86h 0 in infinitely deep water. .... .. ... .. . ..... ... ... ..... . ... 27 215 Reflection coefficient for a submerged obstacle . . ....... ....... .. .......... ......... ..... . . .. 28 Vll
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216 Transmission coefficient as a function ofrelative wavelength (h = 10 1 cm d=67 3 cm trench width = 161.6 cm) . ... . .. .... ......... ... . .. ... .... . . .... ............ . . . .. 30 217 Transmission coefficient as a function of relative wavelength for trapezoidal trench; setup shown in inset diagram ...... .... . .... . . . .. . ... ....... ... .. ... 31 218 Reflection coefficient for asymmetric trench and normally incident waves as a function ofKh1: h 2 /h1=2 h 3 /h1=0.5 L/h1 = 5; L = trench width .. ................ . 32 219 Transmission coefficient for symmetric trench two angles of incidence : L/h 1 = 10 h 2 /h 1 = 2; L = trench width . . . . .... .. . . ... .. .. ... .... . ......... ................... .. 32 220 Transmission coefficient as a function of relative trench depth; normal incidence: k 1 h 1 = 0.2: (a) L/h 1 = 2 ; (b) L/h 1 = 8, L = trench width . .... ..... ..... ..... .. .. 33 221 Total scattering cross section of vertical circular cylinder on bottom .. . ... ........ .. 35 222 Contour plot ofrelative amplitude in and around pit for normal incidence; k 1 / d = n/10, h/d = 0 5 b/a = 1 a/d = 2 a= crossshore pit length b = longshore pit length h = water depth outside pit d = depth inside pit L 2 = wavelength outside pit. ... ...................... ......................... ........ .. . . ... ..... . . . .... 37 223 Contour plot of diffraction coefficient in and around pit for normal incidence ; a/L = l, b / L = 0.5 d/h = 3 kh = 0.167 .. ............. ... . .. . .. . .... .. .... .. .. . ........ . 39 224 Contour plot of diffraction coefficient around surfacepiercing breakwater for normal incidence; a/L = l b / L = 0 5, kh = 0.167 ... .. ... .... . .. . .. . . . . ..... .. .. . ..... 39 225 Maximum and minimum relative amplitudes for different koa, for normal incidence a/b = 6, a/d = n and d/h=2 .. .. .. .. ........ .. ........ .. . ...... .... ... .......... . . . ... . .. .40 226 Comparison of wave height profiles for selected models along transect parallel to shore located 9 m shoreward of shoal apex[ = experimental data]. ..... .44 227 Comparison of wave height profiles for selected models along transect perpendicular to shore and through shoal apex [ =experimental data]. .... .. .. ... . .44 228 Calculated beach planform due to refraction after two years of prototype waves for two pit depths . .. . .... ... ....... . . ... ...... . ......... . .. . .. ..... .. ......... .. .. . . ... ..... 48 229 Calculated beach planform due to refraction over dredged hole after two y ears of prototype waves . .... ... ... ..... . . . ... ................ . .. . . ........ ...... . ... . .. .. ..... . .. 50 230 Comparison of changes in beach plan shape for laboratory experiment and numerical model after two years of prototype waves . .. ... . ........... ... ... ... . ... . . ..... 51 Vlll
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231 Nearshore wave height transformation coefficients near borrow pit from RCPW A VE study .... ........ . . ... . .. . . ... .. . ..................... . . . .. . .... . ... ... . . ... . ...... 53 232 Nearshore wave angles near borrow pit from RCPWA VE study; wave angles are relative to shore normal and are positive for westerly transport . .. . . . 53 233 Reflection coefficients versus dimensionless pit diameter divided by wavelength inside and outside the pit; water depth = 2 m pit depth = 4 m ..... .... 55 234 Shoreline e v olution resulting from each transport term individually for transect located 80 m shoreward of a pit with a radius = 6 m last time step indicated with [+] .. . .. . . . . .. . . . .. . ... .. . .. . . . .. . . ...... .. . . .. .... . . .. . . . . . . .. ...... 57 235 Shoreline evolution using full transport equation and analytic solution model for transect located 80 m shoreward of a pit with a radius = 6 m last time step indicated with [ +]. ... . ...... ...................... .... . .... .... . .. ... . ... .. ........ ... .. 58 31 Definition sketch for trench with vertical transitions . .. ...... .. . . .... . ..... ....... . . . 63 32 Definition sketch for trench with stepped transitions . .. . .. . ........... . .. .. . ... . . . . .. 66 33 Definition sketch for linear transition ............ .... . . .. . . .. . ........... .. . . . ..... . . ........ 70 34 Definition sketch for trench with sloped transitions . . .............. . .. . ..... . ......... . . . 73 41 Definition sketch for circular pit with abrupt depth transitions . .. ... . . . . . . . . . ... 78 42 Definition sketch for boundary of abrupt depth transition ..... ...... . .......... . . .... ...... 82 43 Definition sketch for boundaries of gradual depth transitions ..... .... . ... ... ... .... . . 85 44 Definition sketch for boundaries of exact shallow water solution method .. . ....... 90 51 Matching conditions with depth for magnitude of the horizontal velocity and velocity potential for trench with abrupt transitions and 16 evanescent modes ..... ... ...... . . .... . ...... . . .... . ........ . .. . .... . ........ . .. . ........... . .. . ..... . . .... .. . . . . 94 52 Matching conditions with depth for phase of the horizontal velocity and velocity potential for trench with abrupt transitions and 16 evanescent modes .. . . ........ . ...... . . ..... .. . ............ .. . . .. ...... . .. ... ...... .. . ...... . .. . . . ... . ... ... ... . . 94 53 Relative amplitude for crosstrench transect for k 1 h 1 = 0.13 ; trench bathymetry included with slope = 0 1.. . . .. . . .... ...... ...... . ....... . . .. ..... ........ ... . ... . 95 54 Relative amplitude for crossshoal transect for k 1 h 1 = 0.22 ; shoal bathymetry included with slope= 0.05 ... .. ... . ... .. ...... . . .... . .. . .... .. ... . .... . ...... . ... ... . . ...... . 96 IX
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55 Relative amplitude along crosstrench transect for Analytic Model and FUNW A VE 1D for k 1 h 1 = 0.24 ; trench bathymetry included with slope = O.l .. .. .. . . .. ....... . . .... . . . ........ . .... .......... ..... .. ........... . .... . ......... .......... .... ... ... . . ... 98 56 Relative amplitude along crossshoal transect for Analytic Model and FUNW AVE 1D for k 1 h 1 = 0.24; shoal bathymetry included with upwav e slope of 0.2 and downwave slope of0.05 .. .. . . ...... . .. . .... . .... . .. . . ....... ..... ........ 99 57 Comparison of reflection coefficients from step method and Kirby and Dalrymple (1983a Table 1) for symmetric trench with abrupt transitions and normal wave incidence: h 3 = h 1 h 2 /h 1 = 3 W / h1 = 10 ... . .. . .. . . ...... . . . . . ... .... 100 58 Comparison of transmission coefficients from step method and Kirby and Dalrymple (1983a Table 1) for symmetric trench with abrupt transition and normal w ave incidence : h 3 = h1 h 2 /h1 = 3 W/h1 = 10 ... ... .. .. ... .. ... ... .. .. ... . .. .101 59 Setup for symmetric trenches with same depth and different bottom widths and transition slopes .......... . ... . ................ . . . .. . . . .. . .. . . .. . .... . .. ... ..... ... .... 102 510 Reflection coefficients versus k 1 h 1 for trenches with same depth and different bottom widths and transition slopes. Only onehalf of the symmetric trench crosssection is shown with slopes of 5000 1 0.2 and 0 1. ... 103 511 Transm i ssion coefficients versus k 1 h 1 for trenches with same depth and different bottom widths and transition slopes. Only onehalf of the symmetric trench crosssection is shown with slopes of 5000, 1 0 2 and 0.1. ... 104 512 Reflection coefficient versus the number of evanescent modes used for trenches with same depth and transition slopes of 5000 1 and 0 1. . ..... . . ..... .105 5 13 Reflection coefficient versus the number of steps for trenches with same depth and transition slopes of 5000, 1 and 0.1.. .. . .... . .... .. .. ... ... .... . ... . . . .. .. .. 106 514 Reflection coefficients versus k 1 h 1 for trenches with same bottom width and different depths and transition slopes Only onehalf of the symmetric trench crosssection is shown with slopes of 5000 1 0.2 and 0 05 ..... .. .......... . 107 515 Reflection co e fficients v ersus k 1 h 1 for trenches with same top width and different depths and transition slopes. Only onehalf of the symmetric trench crosssection is shown with slopes of 5000 5, 2 and 1. . .... . . . ..... . . . ... 108 516 Reflection coefficients versus k 1 h 1 for trenches with same depth and bottom width and different transition slopes Only onehalf of the symmetric trench crosssection is shown with slopes of 5000 0 2 0.1 and 0 05 ..... . . ... . . . ... . .... 109 X
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517 Reflection coefficients versus k 1 h 1 for shoals with same depth and different top widths and transition slopes. Only onehalf of the symmetric shoal crosssection is shown with slopes of 5000 0 5 0.2 and 0 05 .. . ...... ........... ..... 110 518 Reflection coefficients versus k 1 h 1 for Gaussian trench with C 1 = 2 m and C 2 = 12 m and ho = 2 m Only onehalf of the symmetric trench crosssection is shown with 43 steps approximating the nonplanar slope .... . ............ 111 519 Reflection coefficients versus k 1 h 1 for Gaussian shoal with C 1 = 1 m and C 2 = 8 m and ho= 2 m. Only onehalf of the symmetric shoal crosssection is shown w i th 23 steps approximating the nonplanar slope ... .......... ..... ... . .... .. . . 112 520 Reflection coefficients versus k 1 hJ for a symmetric abrupt transition trench an asymmetric trench with SJ = 1 and s 2 = 0.1 and a mirror image of the asymmetric trench .... ... .. . . .. ... ... .. . . . .... .... .. ... .. ............ . .... ... . .. . .. .. ..... ....... . 113 521 Reflection coefficients versus kJh 1 for an asymmetric abrupt transition trench (h J h s ), an asymmetric trench with gradual depth transitions (h J h 5 and SJ = s 2 = 0.2) and a mirror image of the asymmetric trench with S J= s 2 . .... 114 522 Reflection coefficients versus kJhJ for an asymmetric abrupt transition trench (h J h 5 ) an asymmetric trench with gradual depth transitions (hJ h 5 and SJ = 1 and s 2 = 0 2) and a mirror image of the asymmetric trench with S J :i=S 2 .. ... . ..................... .... . ........ . .. . . .... .... .......... .. . .. ...... ... .. . .. . . ..... ........ . 115 523 Reflection coefficient versus the space step, dx, for trenches with same depth and different bottom width and transition slopes. Only onehalf of the symmetric trench crosssection is shown with slopes of 5000, 1 and 0 1 ... ... .... 117 524 Reflection coefficients versus k 3 h 3 for three solution methods for the same depth trench case with transition slope equal to 5000. Only onehalf of the symmetric trench crosssection is shown ........... .. ... .. ............. .. ...... . ..... . . . . . .... 118 5 25 Reflection coefficients versus k 3 h 3 for three solution methods for same depth trench case with transition slope equal to 1. Only onehalf of the symmetric trench crosssection is shown ........ . . .. . . ........... ...... . ...... . . ..... ......... 119 526 Reflection coefficients v ersus k 3 h 3 for three solution methods for same depth trench case with transition slope equal to 0.1. Only onehalf of the symmetric trench crosssection is shown . .... . ...... . .. . .. ...... . .. . ... ...... .. .. .. ..... 119 527 Conservation of energy parameter versus k 3 h 3 for three solution methods for same depth trench case with transition slope equal to 1. Only one half of the symmetric trench crosssection is shown . . .. . .... . .... . .. ... . .... .... . ... . . . .. 120 528 Reflection coefficients versus kJhJ for step and numerical methods for Gaussian shoal (ho = 2 m CJ = 1 m C 2 = 8 m). Only onehalf of the Xl
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symmetric shoal crosssection is shown with 23 steps appro x imating the nonplanar slope ... .. ... ........ .............. .... .... ................. .... ...... .......... .......... .. .. ........ 121 529 Reflection coefficients versus k 3 h 3 for step and numerical methods for Gaussian trench in shallow water (h 0 = 0.25 m, C1 = 0 2 m C 2 = 3 m) Only onehalf of the symmetric trench crosssection is shown with 23 steps approximating the nonplanar slope ......... ...... ........ .. ................... ..................... .. 122 530 Reflection coefficients versus k 3 h 3 for three solution methods for sam e depth trench case with symmetric abrupt transition trench and asymmetric trench wi t h unequal transition slopes equal to 1 and 0 1 ............................. ........ 123 531 Reflection coefficients versus k 3 h 3 for three solution methods for same depth trench case with asymmetric abrupt transition trench and asymmetric trench with unequal transition slopes equal to 1 and 0.2 ..................................... 124 61 Matching conditions with depth for magnitude of the horizontal velocity and velocity potential for pit with abrupt transitions and 10 evanescent modes ........ 127 62 Matching conditions with depth for phase of the horizontal velocity and velocity potential for pit with abrupt transitions and 10 evanescent modes ........ 128 63 Contour plot ofrelative amplitude with k 1 h 1 = 0.24 for pit with transition slope = 0 1 ; crosssection of pit bathymetry through centerline included ........... 129 64 Relative amplitude for crossshore transect at Y = 0 with k 1 h 1 = 0.24 for pit with transition slope = 0.1 ; crosssection of pit bathymetry through centerline included Note small reflection ... .. .. .. ........ .................. .. .. ................ .. 130 6 5 Relative amplitude for longshore transect at X = 300 m with k 1 h 1 = 0.24 for pit with transition slope = 0.1; crosssection of pit bathymetry through centerlin e included ....................... .. ... .. ..... .. ......................... ........ .... .................... 130 66 Relative amplitude versus number of evanescent modes included for different Bessel function summations at two locations directly shoreward of a pit with abrupt transitions in depth ........ ........ .................... ..... ................ .......... 132 67 Relati v e amplitude versus number of steps approximating slope for d iff erent Bessel function summations for two pits with gradual transitions in depth ....... 133 68 Contour plot ofrelative amplitude for shoal with k 1 h 1 = 0.29 and transition slope = 0.1; crosssection of shoal bathymetry through centerline included ... .... 134 69 Relati v e amplitude for crossshore transect at Y = 0 for same depth pits for k 1 h 1 = 0 15 ; crosssection of pit bathymetries through centerline included with slop e s of abrupt 1 0.2 and 0.07 ....... ...... .. ...... .... ...... .... .. .. ...... .... ...... ...... .. .. 135 Xll
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61 0 Relative amplitude for crossshore transect at Y = 0 for same depth pits for k 1 h 1 = 0.3; crosssection of pit bathymetries through centerline included with slopes of abrupt, 1, 0 .2 and 0.07 ........... .............. ........... ............... .............. 136 611 Relative amplitude for alongshore transect at X = 200 m for same depth pits for k 1 h 1 = 0.15; crosssection of pit bathymetries through centerline included with slopes of abrupt, 1, 0.2 and 0 07 ................................................... 137 612 Relative amplitude for alongshore transect at X = 200 m for same depth pits for k 1 h 1 = 0.3; crosssection of pit bathymetries through centerline included with slopes of abrupt, 1, 0.2 and 0.07 .................................................................. 138 613 Relative amplitude for crossshore transect located at Y = 0 for same depth shoals with k 1 h 1 = 0.15; crosssection of shoal bathymetries through centerline included with slopes abrupt, 1, 0.2 and 0.05 ....................................... 139 614 Relative amplitude for alongshore transect located at X = 300 m for same depth shoals with k 1 h 1 = 0.15; crosssection of shoal bathymetries through centerline included abrupt, 1, 0 2 and 0 05 ... .... ........ .... ...... ...... ................ ...... . 140 615 Relative amplitude for crossshore transect at Y = 0 for pit with Gaussian transition slope for k 1 h 1 = 0.24; crosssection of pit bathymetry through centerline included ...................................................................... ........ ............... 141 616 Relative amplitude for crossshore transect at Y = 0 for pit with for h = C/r in region of transition slope ; crosssection of pit bathymetry through centerline included .......................................................... ......... ............................ 142 617 Relative amplitude for longshore transect at X = 100 m for pit with for h = C / r in region of transition slope; crosssection of pit bathymetry through centerline included .... ................................... .... ... .... . .... . .................... .......... ... 143 618 Relative amplitude for crossshore transect at Y = 0 for shoal with for h = C*r in region of transition slope; crosssection of shoal bathymetry through centerline included .... .... ..... .................................. . ...... ...... ........... ........... .......... 143 619 Relative amplitude for longshore transect at X = 100 m for shoal with for h = C*r in region of transition slope; crosssection of shoal bathymetry through centerline included .................................................................................. 144 620 Contour plot of wave angles in degrees for pit with k 1 h 1 = 0.24 and transition slope = 0.1; crosssection of pit bathymetry through centerline included ................................................................................................................ 145 621 Contour plot of wave angles for Gaussian shoal with C 1 =1 and C 2 = 10 for k1h1 = 0 .22; crosssection of shoal bathymetry through centerline included th 23 . I w1 steps approx1matmg s ope ....................................................................... 146 Xlll
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6 22 Wave angle for alongshore transect at X = 300 m for same depth pits for k 1 h 1 = 0.15 ; crosssection of pit bathymetries through centerline included with slopes of abrupt 1, 0.2 and 0.07. Negative angles indicate divergence of wave rays ... .. .. .... .. .............. .... .. .............. ......... ................. .. .............. .............. 147 623 Relative amplitude using 3D Step Model and REF/DJF1 for crossshore transect at Y = 0 for Gaussian pit with k 1 h 1 = 0.24 ; crosssection of pit bathymetry through centerline included ... .. .. .. ............... ................... .... ............. 149 624 Relati v e amplitude using 3D Step Model and REF/DJF1 for longshore transect at X = 100 m for Gaussian pit with k 1 h 1 = 0.24; crosssection of pit bathymetry through centerline included ...................................... ........................ 150 625 Relative amplitude using 3D Step Model and REF/DJF1 for longshore transect at X = 400 m for Gaussian pit with k 1 h 1 = 0.24 ; crosssection of pit bathymetry through centerline included ............ .................. .. ...... .... .. .. .. .......... ... 151 626 Wave an g le using 3D Step Model and REF/DJF1 for longshore transect at X = 100 m for Gaussian pit with k 1 h 1 = 0.24; crosssection of pit bathymetry through centerline included ........... .................. ...... ... .. ......... .......... 152 627 Relati v e amplitude using 3D Step Model and REF/DJF1 for crossshore transect at Y = 0 for pit with linear transitions in depth with k 1 h 1 = 0 24 ; crosssection of pit bathymetry through centerline included with slope = O l ........... ... . .. ................. ..... .... ... ..... ......... ...... .. .... .. .. . ... ................. .... .......... .. 153 628 Relati v e amplitude using 3D Step Model and REF/DJF1 for lon g shore transect at X = 350 m for pit with linear transit i ons in depth with k 1 h 1 = 0.24 ; crosssection of pit bathymetry through centerline included with slope =0 1 ........ ..... .......... ............... .. ... .. ........................... .......... .............. ............. .. ... 154 629 Relati v e amplitude using 3D Step Model and 2D fully nonlinear Boussinesq model for crossshore transect at Y = 0 for shoal with k 1 h 1 = 0.32 ; crosssection of pit bathymetry through centerline included ...... .......... ...... 155 630 E x perim e ntal setup of Chawla and Kirby (1986) for shoal centered at ( 0 0) with data transects used in comparison shown .... ............. ...... ...... . .... ............ ... 157 631 Relati v e amplitude using 3D Step Model FUNW A VE 2D and data from Chawla and Kirby (1996) for crossshore transect AA with k 1 h 1 = 1.89 ; crosssect i on of shoal bathymetry through centerline included ...... ........ ............ 158 632 Relati v e amplitude using 3D Step Model FUNW AVE 2D and data from Chawla and Kirby (1996) for longshore transect EE with k 1 h 1 = 1 89; crosssect i on of shoal bathymetry through centerline included ..... ....... ...... ........ 159 XIV
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633 Relative amplitude using 3D Step Model, FUNW AVE 2D and data from Chawla and Kirby (1996) for longshore transect DD with k1h1 = 1.89; crosssection of shoal bathymetry through centerline included ........................... 160 634 Relative amplitude using 3D Step Model, FUNW A VE 2D and data from Chawla and Kirby (1996) for longshore transect BB with k1h1 = 1.89; crosssection of shoal bathymetry through centerline included .... ........ ............... 161 635 Relative amplitude averaged over incident direction (centered at 0 deg) for alongshore transect at X = 300 m for pit with k 1 h 1 = 0.24; crosssection of pit bathymetries through centerline included with slope = 0.1 ............................ 162 636 Wave angle averaged over incident direction (centered at 0 deg) for alongshore transect at X = 300 m for pit with k 1 h 1 = 0.24 with bathymetry indicated in inset diagram of previous figure ...................................................... 163 637 Relative amplitude averaged over incident direction (centered at 20 deg) for alongshore transect at X = 300 m for pit with k 1 h 1 = 0.24; crosssection of pit bathymetries through centerline included with slope = 0.1. ................. .......... 165 638 Wave angle averaged over incident direction (centered at 20 deg) for alongshore transect at X = 300 m for pit with k 1 h 1 = 0.24 with bathymetry indicated in inset diagram of previous figure ................ .......................... ............ 165 639 Reflection coefficient versus nondimensional diameter; comparison between shallow water transect method and farfield approximation method ... 167 640 Reflection coefficient versus k 1 h 1 based on farfield approximation and constant volume and depth pits; crosssection of pit bathymetries through centerline included with slopes of abrupt, 1 0.2 and 0.07 ................................... 168 641 Reflection coefficient versus k 1 h 1 based on farfield approximation and constant volume bottom width pits; crosssection of pit bathymetries through centerline included with slopes of abrupt, 1, 0.2 and 0.05 ..................... 169 642 Reflection coefficient versus k 1 h 1 based on farfield approximation and constant volume and depth shoals; crosssection of shoal bathymetry through centerline included with slopes of abrupt, 1 0.2 and 0.07 ..................... 170 643 Bathymetry for two nearshore regions used in analytic shoaling and refraction model: Pit 1; linear transition slopes with linear nearshore slope and Pit 2; Gaussian transition slopes with Equilibrium Beach form for nearshore slope ...... ............... ................................. ......... .................. ................ .... 172 644 Wave height and wave angle values at start of nearshore region and at breaking for longshore transect with bathymetry with H = 1 m and T = 12 s for Pit 1 ...... ...................... ......... ................... .... .................... .... ............................ 173 xv
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645 Contour plot of wave height for Pit 1 in nearshore region with breaking location indicated with H = 1 m and T = 12 s .. .. . . .... .... ... ...... ........ .. .... .. ..... . 174 646 Wave height and wave angle values at start of nearshore region and at breaking for longshore transect with bathymetry with H = 1 m and T = 12 s for Pit 2 bathymetry . .. . ... ............... ..... .. .... ... . .. . . .. .... ... .. . ... .. . . ............. . 175 647 Contour plot of wave height for Pit 2 in nearshore region with breakin g location indicated with H = 1 m and T = 12 s .................. ............... ... . ..... . ... . .176 648 Wave height and wave angle values at start of nearshore region from 3D Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 1 ..... .. . . 177 649 Wave hei g ht and wave angle values at h = 1.68 m (X = 616 m) from 3D Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 1 .. ... .... 178 650 Wave hei g ht and wave angle values at h = 1.44 m (X = 628 m) from 3D Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 1 .. .. . .. 179 651 Wave he i ght and wave angle values at start ofnearshore region from 3D Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 2 .. . .. . . 180 652 Wave hei g ht and wave angle values at h = 2 04 m (X = 672 m) from 3D Step Mod e l and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pi t 2 ...... . .. 181 653 Wave hei g ht and wave angle values at h = 1.6 m (X = 704 m) from 3D Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 2 . .. .. . . 182 654 Weighted wave averaged values of wave height and wave angle at start of nearshore region and at breaking for longshore transect with H = 1 m and T = 12 s and bathymetry for Pit 1. . .. . ... . .. .. . . .. . ... ..................... . .......... . .. ...... 184 655 Weighted wave averaged values of wave height and wave angle at start of nearshore region and at breaking for longshore transect with H = 1 m and T = 12 s and bathymetry for Pit 2 . .... ..... .. ............. .... . .. . .. ............... . ........... .. . . 184 656 Shoreline evolution for case Pit 1 with K 1 = 0 77 and K 2 = 0.4 for inc i dent wave height of 1 m wave period of 12 s and time step of 50 s with shoreline advancement in the negative X direction; Pit 1 bathymetry alon g crossshore transect included ... ................ . . . .. . .. ........ . .. . .. . . . . ...... . .. .. . .. . 187 657 Parameters for shoreline change after 1 s t time step showing shoreline position, and longshore transport terms for case Pit 1 with K 1 = 0 77 and K 2 = 0 .... . .... ..... ... . .. ............ . . ... .... . ....... ...... .. ... ..... . .... .. ......... .. . .. ..... . . . ....... .... 188 658 Final shoreline planform for case Pit 1 with K 1 = 0 77 and K 2 = 0, 0.2 0.4 and 0.77 for incident wave height of 1 m and T = 12 s with shoreline XVI
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advancement in the negative X direction; Pit 1 bathyrnetry along crossshore transect included . . ... ............... . . .. ... ............. .. ...... . . . .. . .......... . . .... . . 189 659 Change in shoreline position with modeling time at 4 longshore locations (Yp = 0 100, 200, 300 m) for case Pit 1 with K 1 = 0 77 and K2 = 0.4 with shoreline advancement in the negative X direction; Pit 1 bathyrnetry along crossshore transect included . . . .... . .................... . .. . .. . .... . .. . . . . . . ....... ..... 191 660 Comparison of wave height and wave angle values at 600 m and 600 m +/ 20 m for case of Pit 1 for T = 12 s with bathyrnetry and transect locations indicated in bottom plot. . ............................ .. . . .. ... .. . ... .. .. . . .. ... . ... . . .......... 192 661 Final shoreline planform for case Pit 2 with K 1 = 0.77 and K 2 = 0 0.2 0.4, and 0.77 for incident wave height of 1 m, wave period of 12 s, and time step of 50 s with shoreline advancement in the negative X direction ; Pit 2 bathyrnetry along crossshore transect included ............................ ..................... 193 662 Shoreline evolution for case Pit 2 with K 1 = 0 77 and K 2 = 0 for incident wave height of 1 m wave period of 12 s and time step of 50 s with shoreline advancement in the negative X direction; Pit 2 bathyrnetry along crossshore transect included .......................... .................. ...... ...... . . . . . . . . . 194 663 Change in shoreline position with modeling time at 4 longshore locations (Yp = 0 100, 200 300 m) for case Pit 2 with K 1 = 0 77 and K 2 = 0 with shoreline advancement in the negative X direction; Pit 2 bathyrnetry along crossshore transect included ......... ............. ...... ...... .. . .... . .. . .... . . . . ... ......... 195 664 Final shoreline planform for case Shoal 1 with K 1 = 0.77 and K 2 = 0 0.2 0.4 and 0 77 for incident wave height of 1 m wave period of 12 s and time step of 50 s with shoreline advancement in the negative X direction; Shoal 1 bathyrnetry along crossshore transect included .......... .. ... . .. . .. . . . ... . ....... . . 196 665 Shoreline evolution for case Shoal 1 with K 1 = 0. 77 and K 2 = 0 2 for incident wave height of 1 m wave period of 12 s, and time step of 50 s with shoreline advancement in the negative X direction; Shoal 1 bathyrnet ry along crossshore transect included .. . .... .... ... ................ . ...... .. ... .......... ... ..... .. 197 666 Final shoreline planform for case Pit 1 with linear nearshore slope and EBP form for T = 12 sand with K 1 = 0 77 and K 2 = 0 and 0 77 with shoreline advancement in the negative X direction; Pit 1 and Pit 1 b bathyrnetry along crossshore transect included ... . ... .... .. ......... .... .. . ............. . .. . ........ . . . . ... ........ 198 667 Final shoreline planform for case Shoal 1 (linear nearshore slope) and Shoal lb (Equilibrium Beach Profile) for T = 12 sand with K 1 = 0.77 and K 2 = 0 and 0. 77 with shoreline advancement in the negative X direction; Shoal 1 and Shoal 1 b bathyrnetry along crossshore transect included .. . ... ......... ...... .... .. 199 XVll
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668 Final shoreline planform for case Pit 1 for T = 12 sand with K 1 = 0.77 and K 2 = 0.4 for two boundary conditions with shoreline advancement in the negative X direction ; Pit 1 bathymetry along crossshore transect included ...... 201 669 Final shoreline planform for case Shoal 1 for T = 12 sand with K 1 = 0.77 and K 2 = 0. 77 for two boundary conditions with shoreline advancement in the negati v e X direction ; Shoal 1 bathymetry along crossshore transect included .. . . . . .... . . .. . . . . .. . . . . .. . . . .... ........ .. . . .... .. . . .. . . .... ... . . . . . ... .. 202 670 Final shoreline planform for constant volume pits for T = 12 sand w i th K 1 = 0 77 and K 2 = 0 with shoreline advancement in the negative X direction ; crosssection of pit bathymetries through centerline included with slopes of abrupt, 1 0.2 0.07 ... .... ... .......... .. ... .. . . .... . .. ...... . .. . . .. .................... ... . . 203 671 Final shoreline planform for constant volume pits for T = 12 sand w i th K 1 = 0.77 and K 2 = 0 and 0.4 with shoreline advancement in the negative X direction ; crosssection of pit bathymetries through centerline included with slopes of abrupt, 1, 0.2 0.07 .. .... . . .. . . .... . . .... ...... ........... .... . ...... ... . . .......... 205 6 72 Final shoreline planform for 5 periods for constant volume pits with K 1 = 0.77 and K 2 = 0 with shoreline advancement in the negative X direction; crosssection of pit bathymetry through centerline included with slope 0.2 .. . . 205 673 Maximum shoreline advancement and retreat versus period for constant volume pits with K 1 = 0 77 and K 2 = 0; crosssection of pit bathymetries through centerline included with slopes of abrupt, 1 0.2 0.07 .. . ...... . .. . ...... .. . 206 67 4 Maximum shoreline advancement and retreat versus period for constant volume pits with K 1 = 0.77 and K2 = 0.4; crosssection of pit bathymetries through centerline included with slopes of abrupt, 1 0.2 0.07 .. .. ....... ... . ..... ... 207 C1 Setup for analytic nearshore shoaling and refraction method . ...... . ... ... ....... ..... .218 D1 Definition sketch for analytic shoreline change method showing shoreline and contours for initial location and after shoreline change ..... . .... . . ... . . . . . ... 223 xvm
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Abstract of Dissertation Presented to the Graduate School of the University of Florida in Partial Fulfilhnent of the Requirements for the Degree of Doctor of Philosophy WAVE TRANSFORMATION BY BATHYMETRIC ANOMALIES WITH GRADUAL TRANSITIONS IN DEPTH AND RESULTING SHORELINE RESPONSE By Christopher J Bender May 2003 Chair : Robert G. Dean Major Department: Civil and Coastal Engineering Analytic models for the propagation of linear water waves over a trench or shoal of finite width and infinite length (2D Step Model) and over an axisymmetric bathymetric anomaly (3D Step Model) are developed. The models are valid in a region of uniform depth containing a bathymetric anomaly of uniform depth with gradual transitions in depth allowed as a series of uniform depth steps approximating linear or nonlinear slopes The velocity potential obtained determines the wave field i n the domain. The 2D Step Model provides the complete wave field and, therefore the reflection and transmission characteristics for depth anomalies of infinite length that are either symmetric or asymmetric. The 3D Step Model determines the wave transformation caused by the processes of wave refraction, diffraction and reflection Using the known velocity potential an energy flux approach is used to calculate the wave angle and reflected energy at large distances from the anomaly. The 3D Step Model is XIX
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joined with an analytic shoaling and refraction model (Analytic SIR Model) to extend the solution into the nearshore region. The Analytic SIR Model is employed to propagate the wave field up to the point of depth limited breaking. The breaking wave conditions are used to drive the longshore sediment transport and associated shoreline change using the Shoreline Change Model, which provides estimates of the equilibrium shoreline planform located landward of a bathymetric anomaly. Comparisons of the 2D Step Model to shallow water models developed in the study, previous studies, and a numerical model are made with good agreement demonstrated. The reflection coefficients found for symmetric and asymmetric trenches and shoals indicate multiple and no instances of complete transmission, respectively, with the solution independent of the incident wave direction for both cases. Comparisons to a shallow water model, numerical models, and experimental data verify the results of the 3D Step Model for several bathymetries, with the Analytic SIR Model verified by a numerical model for breaking wave conditions. Modeled equilibrium planforms landward ofbathymetric anomalies indicate the importance of the longshore transport coefficients with either erosion or shoreline advancement possible for several cases presented. xx
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CHAPTER 1 INTRODUCTION AND MOTIVATION Irregular and unexpected shoreline planforms adjacent to nearshore borrow areas have increased a w areness of the wave field modification caused by bathymetric anomalies such as borrow pits or shoals. When a wave field in a region of generally uniform depth encounters a bathymetric anomaly the wave field is modified through wave refraction wave diffraction wave reflection and wave dissipation, with the first three known collectively as scattering. These four wave transformation processes result in a modified wave field that propagates towards and eventually impacts the shoreline. The modified wa v e field will alter the longshore transport leading to a shorel i ne planform that is held to an artificial equilibrium Case studies such as the beach nourishment projects at Grand Isle Louisiana and Anna Maria Key Florida have shown the possible effects of a nearshore borrow area on the adjacent shoreline planform. The ability to predict and possibly design for the equilibrium planform in the vicinity of a bathymetric anomaly requires a better understanding of both the wave and sediment processes near the anomaly. The focus of this report is to better understand the wave field modifications caused by bathymetric anomalies of both twodimensional and threedimensional forms with results providing the foundation for study on the sediment transport processes and shoreline changes induced 1
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2 Several studies including field and laboratory scales have been conducted to investigate this issue. These studies examined the wave transformation over a bathymetric anomaly with the shoreline changes caused by the altered wave field. Earlier dating back to the early 1900' s the focus was on the modification of a wave train encountering a change in bathymetry which was solved using analytic methods. This early research included development of analytical solutions for bathymetric changes in the form of a step or a pit first of infinite length (in one horizontal dimension ; 2D models), and more recently of finite dimensions (in two horizontal dimensions ; 3D models) The complexity of the 3D models has advanced from a pi t/ shoal with vertical sidewalls and uniform depth surrounded by water of uniform depth which can be solved analytically to domains with arbitrary bathymetry that are solved using complex numerical schemes Some models combine the calculation of the wave transformation and resulting shoreline change whereas others perform the wave calculations separately and rely on a different program for shoreline evolution 1.1 Motivation Changes in offshore bathymetry modify the local wave field, thus causing an equilibrium planform that may be altered significantly from the previous, relatively straight shoreline. Not only can a bathymetric change cause wave transformation but also may change the sediment transport dynamics by drawing sediment into it from the nearshore or by intercepting the onshore movement of sediment. Knowledge of wave field modifications and the resulting effects on sediment transport and shoreline evolution is essential in the design of beach nourishment projects and other engineering activities that alter offshor e bathymetry
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3 Beach nourishment has become the preferred technique to address shoreline erosion. In most beach nourishment projects the fill placed on the eroded beach is obtained from borrow areas located offshore of the nourishment site. The removal of large quantities of fill needed for most projects can result in substantial changes to the offshore bathymetry through the creation of borrow pits or by modifying existing shoals The effect of the modified bathymetry in the borrow area on the wave field and the influence of the modified wave field on the shoreline can depend on the incident wave conditions, the nourishment sediment characteristics and some features of the borrow area including the location size, shape and orientation. The large quantities of sediment used in beach nourishment projects combined with the increase in the number of projects constructed, and an increased industrial need for quality sediment have in many areas, led to a shortage of quality offshore fill material located relatively near to the shore. This shortage has increased interest in the mining of sediment deposits located in Federal waters, which fall under the jurisdiction of the Minerals Management Service (MMS). Questions have been raised by the MMS regarding the potential effects on the shoreline of removing large quantities of sediment from borrow pits lying in Federal waters (Minerals Management Service 2003) A better understanding of the effects of altering the offshore bathymetry is currently needed. The scattering processes of wave refraction, diffraction and reflection modify the wave field in a complex manner dependent on the local wave and nearshore conditions. A more complete understanding and predictive capability of the effect of bathymetric changes to the wave field and the resulting shoreline modification leading to less impactive design of dredge pit geometries should be the goal of current research.
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4 1.2 Models Developed and Applications A better understanding of the wave field near bathymetric anomalies can be obtained through models that more accurately represent their shapes and the local wave transformation processes. The models developed in this study extend previous analytic methods to better approximate the natural domain and extend the problem from the offshore region to the shoreline By meshing a model constrained by a uniform depth requirement outside of the bathymetric anomaly to a nearshore model with a sloped bottom, linear waves can be propagated from the offshore over the anomaly and into the nearshore where shoaling and refraction lead to wave breaking and sediment transport A longshore sediment transport model can then predict the shoreline changes resulting from the wave field modified by the bathymetric anomaly. Previous analytic 3D models and all of the previous 2D models, with the exception of Dean (1964) and Lee et al. (1981), have domains that contain abrupt transitions in depth (vertical sidewalls) for the bathymetric anomaly A more realistic representation of natural bathymetric anomalies should allow for gradual transitions (sloped sidewalls). The focus of the present study is the propagation of water waves over a 2D (trench or shoal) or 3D (pit or shoal) bathymetric anomaly of more realistic geometry and the wave transformation they induce. Three solution methods are developed for a 2D domain with linear water waves and normal wave incidence: (1) the 2D step method, (2) the slope method and (3) a numerical method. The 2D step method is valid in arbitrary water depth while the slope method and the numerical method are valid only for shallow water conditions. The step method is an extension of the Takano (1960) solution as modified by Kirby and Dalrymple (1983a) that allows for a trench or shoal with "stepped" transitions that
PAGE 25
5 approximate a specific slope or shape. The slope method is an extension of the Dean (1964) solution that allows for linear transitions between the changes in bathymetry for a trench or shoal creating regular or irregular trapezoids The numerical method employs a backward spacestepping procedure for arbitrary (but shallow water) bathymetry with the transmitted wave specified. The 2D models are compared against each other, with the results of Kirby and Dalrymple (1983a) and with the numerical model FUNW AVE 1.0 [1D] (Kirby et al. 1998) For a 3D domain, an analytic solution to the wave field modification caused by bathymetric anomalies with sloped transitions in depth is developed. This solution is an extension of previous work for anomalies with abrupt depth transitions in regions of otherwise uniform depth that employs steps to approximate a gradual transition in depth. A shallow water analytic solution is also developed, which is valid for specific sidewall slope and pit size combinations. The 3D models are validated with the laboratory data of Chawla and Kirby (1996), the numerical models REF/DIF1 (Kirby and Dalrymple, 1994) and FUNW A VE 1.0 [2D] (Kirby et al., 1998), and the numerical model of Kennedy et al. (2000) and through direct comparisons. The application of the different models to realworld problems depends on the situation of interest. The study of 2D models can demonstrate the reflection caused by long trenches or shoals of finite width such as navigation channels and underwater breakwaters, respectively. The 3D models can be employed to study problems with variation in the longshore and nonoblique incidence. Wave related quantities such as energy flux and wave direction are calculated and indicate the influence of the bathymetric anomaly. The wave heights and directions for transects located shoreward of
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6 the anomaly are combined with an analytic shoaling and refraction method to determine the wave propagation in a nearshore zone of arbitrary slope. The longshore transport and shoreline evolution are also calculated for the nearshore (shoaled and refracted) wave field that occurs shoreward of the anomaly. Through the methods developed in this study the wave transformation, energy reflection, longshore transport, and shoreline evolution induced by a 3D bathymetric anomaly with gradual transitions in depth can be investigated.
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CHAPTER2 LITERATURE REVIEW Several methods have been employed to quantify the impact on the shoreline caused by changes in the offshore bathymetry including case studies, field experiments, analytical developments, numerical models, and laboratory studies. The intriguing behavior of the shoreline following beach nourishment projects at Grand Isle, Louisiana, Anna Maria Key, Florida, and Martin County, Florida, have led to questions and investigations regarding the impact of the significant offshore borrow areas present in each case. Field studies have been used to investigate the impact of offshore dredging in relatively deeper water to attempt to define a depth at which bathymetric changes will not induce significant wave transformation. Laboratory experiments have documented wave transformations caused by changes in the bathymetry and the resulting effects on the shoreline in controlled settings possible only in the laboratory. Solutions for wave transformation by changes in the bathymetry are outlined primarily in chronological order following the development from analytical solutions for long waves in one horizontal dimension (2D) through numerical models for arbitrary bathymetry that include many waverelated nearshore processes in 3 dimensions. Modeling of shoreline responses due to wave field modification from changes in offshore bathymetry is examined with models that include both wave field and shoreline changes and by coupling models that evaluate these processes independently. The wave 7
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8 transformation processes included in nearshore models are important factors in the capability to predict a salient leeward of a pit the shoreline responses observed in the limited laboratory experiments and at Grand Isle Louisiana. 2.1 Case Studies 2 1.1 Grand Isle, Louisiana (1984) The beach nourishment project at Grand Isle Louisiana, provides one of the most interesting, and well publicized examples of an irregular planform resulting from the effects of a large borrow area lying directly offshore One year after the nourishment project was completed, two large salients flanked by areas of increased erosion, developed immediately shoreward of the offshore borrow area Combe and Solieau (1987) provide a detailed account of the shoreline maintenance history at Grand Isle Louisiana specifications of the beach nourishment project that was completed in 1984 and details of the shoreline evolution in the two years following completion. The project required 2 1 x 10 6 m 3 of sediment with approximately twice this amount dredged from an area lying 800 m from the shore (Combe and Soileau 1987) in 4.6 m of water (Gravens and Rosati 1994). The dredging resulted in a borrow pit that was "dumbbell shaped in the planform with two outer lobes dredged to a depth of 6 1 m below the bed connected by a channel of approximate 1,370 m length dredged to 3 1 m below the bed (Combe and Soileau 1987) The salients seen in Figure 21 started to form during storm events that occurred during the winter and spring of 1984 / 85 (Combe and Soileau 1987) By August 1985 the salients and associated areas of increased erosion w ere prominent features on the shoreline. An aerial survey of the area that was completed by the New Orleans District of the Army Corps of Engineers and the Coastal Engineering
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9 Research Center concluded that the size and location of the borrow area were such that its presence could affect the local wave climate (Combe and Soileau, 1987). Oblique aerial photography identified the diffraction of the wave field as a result of the borrow area (Combe and Soileau, 1987). The area of increased erosion near the salients was found to "affect 25% of the project length and amounted to about 8% of the neat project volume" (Combe and Soileau, 1987, pg. 1236). Figure 21: Aerial photograph showing salients shoreward of borrow area looking East to West along Grand Isle, Louisiana, in August, 1985 (Combe and Solieau, 1987). Three major hurricanes impacted the project area in the hurricane season following the project's completion, the first time that three hurricanes struck the Louisiana coastline in the same season (Combe and Soileau, 1987). While these storms did tremendous damage to the newly formed berm and caused large sediment losses the location and size of the salients remained relatively unchanged. The salients have remained on the Grand Isle shoreline as shown by an aerial photograph from 1998
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10 (Figure 22) It appears that the eastern salient has decreased in size while the western salient has remained the same size or even become larger. Figure 22 : Aerial photograph showing salients shoreward of borrow area along Grand Isle, Louisiana in 1998 (modified from Louisiana Oil Spill Coordinator's Office (LOSCO), 1999) A series of detached offshore breakwaters was constructed along the eastern part of Grand Isle in the 1990' s, which terminate at the eastern salient and may have affected its shape. Bathymetric surveys taken through the borrow area in February 1985 and August 1986 revealed that the outer lobes had filled to about half their original depth and the channel connecting the lobes had reached the sea bed elevation (Combe and Soileau 1987). Currently the borrow area is reported to be completely filled by fine material
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11 (Combe, personal correspondence) which would have required the same approximate volume of sediment that was dredged for the initial placement. Although the origin of the sediment that has refilled the borrow pit is not known, it is reported to be finer than the sediment dredged for the nourishment project, indicating that the material did not originate from the project. While no longer a bathymetric anomaly, the borrow areas are reported to continue to modify the wave field as local shrimpers use the waters shoreward of the pit as a harbor to weather storms. The reason for the sheltering effect of the filled pit may be due to the energydissipating characteristic of the finer material that has filled the pit. 2.1.2 Anna Maria Key. Florida (1993) The 1993 beach nourishment project at Anna Maria Key, Florida, is another example of a project with a large borrow area lying offshore in relatively shallow water. The project placed 1.6x 10 6 m 3 of sediment along a 6.8 km segment (DNR Monuments R12 to R3s*) of the 11.6 km long barrier island (Dean et al., 1999). The borrow area for the project was approximately 3,050 m long and ranged from 490 to 790 m offshore in approximately 6 m of water (Dean et al., 1999) A planview of the bathymetry near the project including the borrow area is shown in Figure 23. A transect through the borrow area, indicated in the previous figure at Monument R26, is shown in Figure 24 and shows dredging to a depth of 3 1 m below the local seabed. This figure shows one pre project transect, a transect immediately following completion and two postnourishment transects The postnourishment transects indicate minimal infilling of the borrow pit. The "DNR Monuments" are permanent markers spaced at approximately 300 m along the Florida sandy beaches for surveying purposes
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12 The shoreline planform was found to show the greatest losses shoreward of the borrow area. Figure 25 shows the shoreline position relative to the August, 1993, data for seven different periods. A large area of negative shoreline change indicating erosion is found from DNR Monument numbers 25 to 34 for the July, 1997, and February, 1998, data. This area lies directly shoreward of the borrow area shown in Figure 23. The behavior of the shoreline directly leeward of the borrow area is seen to be the opposite of the Grand Isle, Louisiana, response where shoreline advancement occurred Volume changes determined from profiles in the project area did not show large negative values near the southern end of the project. The difference between the shoreline and volume changes at the southern end of the project implies that the constructed profiles may have been steeper near the southern end of the project as compared to those near the northern end (Wang and Dean, 2001). The proximity of the borrow area to the shoreline is one possible contribution to the local erosion. Although the reason for the increased erosion in this area is not clear, it is interesting that the anomalous shoreline recession did not occur until the passage of Hurricanes Erin and Opal in August and October, 1995, respectively. Hurricane Opal was a category 4 hurricane with sustained winds of 67 mis when it passed 600 km west of Manatee County (Liotta, 1999). A reported storm surge of 0.3 to 1 0 m, combined with the increased wind and wave action, resulted in overtopping of the beach berm, flooding of the back area of the project and transport of sediment to the back beach or offshore (Liotta, 1999). The average shoreline retreat for the project area was approximately 9.1 to 15.2 m, based on observations (Liotta, 1999).
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13 R 41 Longboat Pass Figure 23: Bathymetry off Anna Maria Key, Florida showing location of borrow pit following beach nourishment project (modified from Dean et al., 1999).
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9.15 6.10 e 3.05 i:: 14 PreProject (Dec. 1992) oPostProject February 1995 8 0
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15 2.1 3 Martin County, Florida (1996) The Hutchinson Island beach nourishment project in Martin County Florida was constructed in 1996 with the placement of approximately 1.1 x 10 6 m 3 of sediment along 6.4 km of shoreline between DNR Monuments R1 and R25 (Sumerell 2000 ) The borrow area for this project was a shoal rising 4.9 m above the adjacent bed and lying 910 m offshore in 12 8 m of water (Sumerell, 2000). Figure 26 shows the borro w area location offshore of the southern end of the project area. An average of 3 m of sediment was dredged from the central portion of the shoal. INOLAN RIVER AH.AN TIC OCEAN Figure 26 : Project area for Martin County beach nourishment project (Applied Technology and Management 1998). The 3year and 4year postnourishment shoreline surveys show reasonable agreement with modeling conducted for the project except at the southern end near the borrow area (Sumerell 2002) Figure 27 shows the predicted shoreline and the survey
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16 data for the 4year shoreline change. This case differs from the previous two as the borrow area did not create a pit but reduced the height of an offshore shoal. By lowering the height of the shoal the shoreline leeward of the borrow area was exposed to greater wave action, which is the opposite of the sheltering (through reflection) effect of an offshore pit. The borrow area, with its large extent and proximity to the project, is a possible reason for the higher than expected erosion at the southern end of the project. E .... .... ... rt, E 0 .... C1J u A 30.5 r~ Predicted 15.2 Survey Data (December 99) !'.l 15. 2 m ... 0 30 5 45 7 ....__ ____________________ __, Figure 27: Fouryear shoreline change for Martin County beach nourishment project: predicted versus survey data (modified from Sumerell, 2000). 2.2 Field Experiments Field studies have been conducted to examine the effects of offshore dredging on the coastal environment. The purposes of the these studies have varied and include the tendency of a dredged pit to induce sediment flows into it from the nearshore, the interception of sediment transport, and wave transformation effects of a newly dredged pit on the shoreline.
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17 2.2.1 Price et al. (1978) Price et al. (1978) investigated the effect of offshore dredging on the coastline of England. The tendency of a dredge pit to cause a drawdown of sediment and to prevent the onshore movement of sediment was investigated. The study by Inman and Rusnak (1956) on the onshoreoffshore interchange of sand off La Jolla, California, was cited. This threeyear study found vertical bed elevation changes of only+ / 0.03 mat depths greater than 9 m Based on the consideration that the wave conditions off the southern coast of England would be less energetic than off La Jolla, California, Price et al. (1978) concluded that beach drawdown at a depth greater than 10 m would not occur. A radioactive tracer experiment off Worthing, on the south coast of England was performed to investigate the mobility of sediment at depths of 9, 12, 15, and 18 m. The 20month study found that at the 9 and 12 m contours there was a slight onshore movement of sediment and it was concluded that the movement of sediment beyond a depth contour of 18 m on the south coast of England would be negligible. Therefore, at these locations and in instances when the onshore movement of sediment seaward of the dredge area is a concern, dredging in water beyond 18 m depth below low water level was considered acceptable (Price et al., 1978). A numerical model of the shoreline change due to wave refraction over dredged holes was also employed in the study, the details of which will be examined later in Section 2 5.2.1. The model found that minimal wave refraction occurred for pits in depths greater than 14 m for wave conditions typical off the coast of England 2.2.2 Kojima et al. (1986) The impact of dredging on the coastline of Japan was studied by Kojima et al. (1986). The wave climate as well as human activities (dredging construction of
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18 structures) for areas with significant beach erosion and/or accretion was studied in an attempt to determine a link between offshore dredging and beach erosion The study area was located offshore of the northern part of Kyushu Island. The wave climate study correlated yearly fluctuations in the beach erosion with the occurrence of both storm winds and severe waves and found that years with high frequencies of storm winds were likely to have high erosion rates. A second study component compared annual variations in offshore dredging with annual beach erosion rates and found strong correlation at some locations between erosion and the initiation of dredging although no consistent correlation was identified. Hydrographic surveys documented profile changes of dredged holes over a four year period. At depths less than 30 m, significant infilling of the holes was found, mainly from the shoreward side, indicating a possible interruption in the longshore and offshore sediment transport. This active zone extends to a much larger depth than found by Price et al. (1978) and by Inman and Rusnak (1956). The explanation by Kojima et al. is that although the active onshore / offshore region does not extend to 30 m, sediment from the ambient bed will fill the pit causing a change in the supply to the upper portion of the beach and an increase in the beach slope. Changes in the beach profiles at depths of 35 and 40 m were small and the holes were not filled significantly. Another component of the study involved tracers and seabed level measurements to determine the depths at which sediment movement ceases Underwater photographs and seabed elevation changes at fixed rods were taken at 5 m depth intervals over a period of 3 months during the winter season for two sites. The results demonstrated that sediment movement at depths up to 35 m could be significant. This depth was found to
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19 be slightly less than the average depth (maximum 49 m minimum 20 m) for five proposed depth of closure equations using wave inputs with the highest energy (H = 4.58 m, T = 9.20 s) for the 3month study period. 2.3 Laboratory Experiments 2 3.1 Horikawa et al. (1977) Laboratory studies have been carried out to quantify wave field and nearshore modifications due to the presence of offshore pits. Horikawa et al. (1977) performed wave basin tests with a model of fixed offshore bathymetry and uniform depth containing a rectangular pit of uniform depth and a nearshore region composed of moveable lightweight sediments The experimental arrangement is shown in Figure 28. The incident wave period and height were 0.41 sand 1.3 cm, respectively. With the pit covered waves were run for 5 5 hours to obtain an equilibrium planform followed by wave exposure for three hours with the pit present. Shoreline measurements were conducted at 1 hour intervals to determine the pit induced changes u 400 300 200 100 0 C .,~.........,.,~.... ..,.. : ...., .......12 0 ,!! i "'"" _':: S HORELINE/ ~ < 4 0 L :.; C g' I I ~ . o _3 I I (un i t : cm) 20 5Wl ,, l 0 9 J I :l 0": 0 _;_.a~~~&::;~~~~~~~~~~~~~~~ 0 200 100 0 Offshor~ dist~nct Figure 28: Setup for laboratory experiment (Horikawa et al. 1977)
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20 The results of the experiment are presented in Figure 29 Almost all of the shoreline changes with the pit present occurred in the first two hours. At the still water level, a salient formed shoreward of the pit, flanked by two areas of erosion that generally extend to the sidewalls of the experiment; however, the depth contour at a water depth h = 0.85 cm also shown in Figure 29 shows only a slightly seaward displacement at the pit centerline. 25 E V 20 > o," ... 0 .c 0 0, V C a Ill 0 0 0 20 o Longshore h 0 8 S cm ha 0cm 6 0 80 100 120 d i stance, X (cm) Figure 29: Results from laboratory experiment showing plan shape after two hours (Horikawa et al. 1977) 2 3.2 Williams (2002) Williams (2002) performed wave basin experiments similar to those of Horikawa et al. (1977). The experimental setup of a fixed bed model containing a pit with a moveable sand shoreline was constructed for similar trials by Bender (2001) and was a larger scale version of the Horikawa et al. (1977) arrangement. The Williams e x perimental procedure consisted of shoreline bathymetric and profile measurements after specified time intervals that comprised a complete experiment. Figure 210 shows the experiment progression sequence that was used. For analysis the shoreline and
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21 volume measurements were made relative to the last measurements of the previous 6hour phase. The conditions for the experiments were 6 cm waves with 1 35 s period and a depth of 15 cm in the constant depth region surrounding the pit. The pit was 80 cm long in the crossshore direction 60 cm in the longshore direction and 12 cm deep relative to the adjacent bottom. CoMplete E x periMent Current Control Next Control Pho.ses Pho.ses Previous Test (cover ed pit ) Current Test
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c :::i 0. ,.!:'. C1) .., c, E C: I) ca ,r:; ,r:; u 22 150 +C1) g' 1 0 120 100 80 E C1) :::i .J .. 0 > .. Longshore Po sition (cm) I 0 to 6 Hours 6 to 12 Hours I (pit covered) (pit present) 1 0 Figure 211: Volume change per urut length tor hrst expenment l W 11liams 2002) The net volume change for the first complete experiment (control and test phase) was approximately 2500 cm 3 Different net volume changes were found for the three experiments However similar volume change per unit length results were found in all three experiments indicating a positive volumetric relationship between the presence of the pit and the landward beach. The shoreline change results showed shoreline retreat, relative to Time Step 0 0, in the lee of the borrow pit during the control phase (pit covered) for all three experiments with the greatest retreat at or near the centerline of the borrow pit. All three experiments showed shoreline advancement in the lee of the borrow pit with the pit uncovered (test phase). With the magnitude of the largest advancement being almost equal to the largest retreat in each experiment, it was concluded that under the conditions tested the presence of the borrow pit resulted in shoreline advancement for the area shoreward of the borrow pit (Williams 2002) An evenodd analysis was applied to the shoreline and volume change results in an attempt to isolate the effect of the borrow pit. The even function was assumed to represent the changes due solely to the presence of the borrow pit. The even components
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23 were adjusted to obtain equal positive and negative areas, which were not obtained using the laboratory data. For each experiment, the shifted even results shoreward of the pit showed positive values during the test phase for both the shoreline and volume changes with negative values during the control phase The shifted even component of shoreline change for the first experiment is shown in Figure 212. These results further verify the earlier findings concerning the effect of the pit. G) C: 0 .s::. en 0 'E E 0 G) C. C) E c: 0 nl u 5 1 C: G) > w "C G) :E en ... ~o 120 100 ,., ,,,,, o /'c "\. ,, ., ., / / , ... .J ., ,, '" 100 y 60 ~ 20 0 20 120 1 5 ',,.,, / .... o 0 ~ Longshore Position (cm) I0 to 6 Hours 6 to 12 Hours I (pit covered) (pit present) Figure 212: Shifted even component of shoreline change for first experiment (Williams 2002). 2.4 Wave Transformation 2.4.1 Analytic Methods There is a long history of the application of analytic methods to determine wave field modifications by bathymetric changes. Early research centered on the effect on normally incident long waves of an infinite step, trench or shoal of uniform depth in an otherwise uniform depth domain. More complex models were later developed to remove the long wave restriction add oblique incident waves and allow for the presence of a
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24 current. More recently, many different techniques have been developed to obtain solutions for domains containing pits or shoals of finite extent. Some of these models focused solely on the wave field modifications, while others of varying complexity examined both the wave field modifications and the resulting shoreline impact. 2.4.1.1 2Dimensional methods By matching surface displacement and mass flux normal to the change in bathymetry Lamb (1932) was one of the first to develop a long wave approximation for the reflection and transmission of a normally incident wave at a finite step. Bartholomeauz (1958) performed a more thorough analysis of the finite depth step problem and found that the Lamb solution gave correct results for the reflection and transmission coefficients for lowest order (kh) where k is the wave number and h is the water depth prior to the step. Sretenskii (1950) investigated oblique waves over a step between finite and infinite water depths assuming the wavelength to be large compared to the finite depth. An extensive survey of early theoretical work on surface waves including obstacle problems is found in Wehausen and Laitone (1960). Kreisel (1949) developed a method that conformally mapped a domain containing certain obstacles of finite dimensions into a rectangular strip. The reflection from obstacles at the surface and on the bottom were considered. Kreisel (1949) presents a proof demonstrating that the reflection coefficient is independent of the incident wave direction for a symmetric (upwave and downwave depth equal) or asymmetric obstacle (trench or shoal) in arbitrary water depth. Jolas (1960) studied the reflection and transmission of water waves of arbitrary relative depth over a long submerged rectangular parallelepiped (sill) and performed an experiment to document the wave transformation. To solve the case of normal wave
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25 incidence and arbitrary relative depth over a sill or a fixed obstacle at the surface Takano (1960) used an eigenfunction expansion of the velocity potentials in each constant depth region and matched them at the region boundaries. The set of linear integral equations was solved for a truncated series A laboratory experiment was also conducted in this study. Dean (1964) investigated long wave modification by linear transitions. The linear transitions included both horizontal and vertical changes. The formulation allowed for many domains including a step, either up or down, and converging or diverging linear transitions with a sloped wall. A proposed solution was defined with planewaves of unknown amplitude and phase for the incident and reflected waves with the transmitted wave specified. Wave forms, both transmitted and reflected, were represented by Bessel functions in the region of linear variation in depth and/or width. The unknown coefficients were obtained through matching the values and gradients of the water surfaces at the ends of the transitions. Analytic expressions were found for the reflection and transmission coefficients. The results indicate that the reflection and transmission coefficients depend on the relative depth and/or width and a dimensionless parameter containing the transition slope, the wavelength and the depth or width (Figure 213) In Figure 213 the parameter Z, = 4trh I for the case of linearly varying depth and L,S v z, = trb, for linearly varying breadth where I indicates the region upwave of the LSH transition Sv is equal to the depth gradient, and SH is equal to onehalf the breadth gradient. These solutions were shown to converge to those of Lamb (1932) for the case of an abrupt transition (Z 1 =0)
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26 II! u I ; I I r :' ~ ' , i v,, I ~ ..., J I \'I, ~ 'v. I! I \ /I I % ,I ,,, l IV~ ::. 0 I 1 ,, /ii' f" I I 9. o ~ I .,' J i_l,~ e l ,1.,, ,,, .. _,, ~' .. / ., 1 / _,{"' ;1,,I> o., ,, / I .. 'I.~ C: / ~ 11 ,,_J I ~ I ,~,,1 /
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27 Newman (1965b) examined the propagation of water waves past long obstacles. The problem was solved by constructing a domain with two steps placed back to back" and applying the solutions of Newman (1965a). Complete transmission was found for certain water depth and pit length combinations; a result proved by Kriesel (1949). Figure 214 shows the reflection coefficient, Kr, and the transmission coefficient K 1 versus Koho where Ko is the wave number in the infinitely deep portion before the obstacle and h o is the depth over the obstacle. The experimental results ofTakano (1960) are included for comparison It is evident that the Takano experimental data included energy losses 0 r 11 0 3 \) 1 0 0 Numerical results of Newman (1965b) o Takano (1960) experimental results 0 0 8 Figure 214: Approximate reflection and transmission coefficients for the rectangular parallelepiped of length 8 86ho in infinitely deep water (Newman 1965b ).
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28 The variational approach was applied by Mei and Black (1969) to investigate the scattering of surface waves by rectangular obstacles. For a submerged obstacle complete transmission was found for certain kho values where h 0 is the depth over the obstacle A comparison of th e results of Mei and Black (1969) and those ofNewman (1965b) is shown in Figure 215 which presents the reflection coefficient versus kho for a submerged obstacle. Data from the Jolas (1960) experiment are also included on the plot and compared to the results of Mei and Black (1969) for a specific R. I h 0 where R. is the halflength of the obstacle. I Ri [Mei and Black (1969)], o [data from Jolas (1960) experiment] ( R. I ho = 4.43, h/ho = 2. 78) [Mei and Black (1969)], [ ewman 0 ....._.....__.....__1.1._L __ 1.11_x.__..1..__ ~ "'1== ~ :::::::..___J 0 02 0 4 0 6 O S lO 1 2 1 1 6 kh 0 Figure 215 : Reflection coefficient for a submerged obstacle (Mei and Black, 1969). Black and Mei (1970) applied the variational approach to examine the radiation caused by oscillating bodies and the disturbance caused by an object in a wave field Two domains were used for both submerged and semiimmersed (surface) bodies: the first domain was in Cartesian coordinates with one vertical and one horizontal
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29 dimension for horizontal cylinders of rectangular cross section and the second domain was in cylindrical coordinates, for vertical cylinders of circular section The second domain allowed for objects with two horizontal dimensions to be studied for the first time (see Section 2.4 1 2 ) Black et al. (1971) used the variational formulation to study the radiation due to the oscillation of small bodies and the scattering induced by fi x ed bodies Black et al. demonstrated the scattering caused by a fixed object in a single figure; see Black and Mei (1970) for further results. Lassiter (1972) used complementary variational integrals to solve the problem of normally incident waves on an infinite trench where the depth on the two sides of the trench may be different (the asymmetric case). The symmetric infinite trench problem was studied by Lee and Ayer (1981), who employed a transform method. The fluid domain was divided into two regions one an infinite uniform depth domain and the other a rectangular region representing the trench below the uniform seabed level. T he transmission coefficient for the trench is shown in Figure 216 with the theoretical results plotted along with data from a laboratory experiment conducted as part of the study. Results from a boundary integral method used to compare with the theoretical results are also plotted. The results show six of an infinite number of relative wavelengths where complete transmission ( K 1 = l) will occur, a result that had been found in prior studies (Newman (1965b ), Mei and Black (1969)). The laboratory data show the general trend of the theoretical results with some variation due to energy losses and reflections from the tank walls and ends. Lee et al. (1981) proposed a boundary integral method for the propagation of waves over a prismatic trench of arbitrary shape which was used for comparison to
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30 selected results in Lee and Ayer (1981). The solution was found by matching the unknown normal derivative o f the potential at the boundary of the two regions. A comparison to pre v ious results for trenches with vertical sidewalls was conducted with good agreement. A case with bathymetry containing gradual transitions in depth was shown in a plot of the transmission coefficient for a trapezoidal trench (Figur e 217 ). Note that the complete dimensions of the trapezoidal trench are not specified i n the inset diagram making direct comparison to the results impossible 1 00 0 c 0 <) n E o> 8 0 C: 0 : ~ a o so e f0 [Numerical Solution] [Experimental Results] x [Boundary Integral Method] 0 ?0 OL~0:...1. 0 S ____ O.L l_O _ __ O 'I S __ __ 0....,_ 20':'0 :!5 De pth t o w a v ele n gth ratio ( h /A) Figure 216: Transmission coefficient as a function ofrelative wavelength (h = lO. J cm, d = 67 3 cm trench width = 161.6 cm) (modified from Lee and Ayer 1981) Miles (198 2 ) solved for the diffraction by an infinite trench for obliquely incident long waves The solution method for normally incident waves used a procedure developed by Kreisel (1949) that conformally mapped a domain containing certain obstacles of finite dimensions into a rectangular strip. To add the capability of solving
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31 for obliquely incident waves Miles used the variational formulation of Mei and Black (1969) ,J i:: Q) .I l 0 0 ~ 0 9~ ..... ..... Q) 0 u i:: 0 ~ :J. ',l(l Ill .I E: Cl)
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32 0.5 [Kirby and Dalrymple (1983a)] [Lassiter (1972, Fig. 7)] [Boundary Integral Method] 0 1 0 0.1 o : 0 3 0.4 0 5 0 6 0 7 o Figure 218: Reflection coefficient for asymmetric trench and normally incident waves as a function ofKh 1 : h 2 /h 1 = 2, h 3 /h 1 =0.5 L/h 1 = 5; L = trench width (Kirby and Dalrymple 1983a). [Numerical solution 8 1 = 0 deg] [Numerical solution 8 1 = 45 deg] o ~ L., __ _,...._ __ __.__ _______ ._ _________ _____ :0 2 0.4 0 6 0 8 1.0 1 2 1.4 k1h1 Figure 219: Transmission coefficient for symmetric trench two angles of incidence: L/h 1 =10, h 2 /h 1 =2 ; L = trench width (modified from Kirby and Dalrymple 1983a). This study also investigated the planewave approximation and the longwave limit, which allowed for comparison to Miles (1982). Figure 220 shows transmission coefficients with the results of the numerical solution, the long wave solution and values from the Miles (1982) solution which is only valid for small kh values in each region. For the first case with a small relative trench width, the numerical results from Kirby and
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33 Dalrymple compare well with the results using the Miles (1982) method and the plane wave solution is seen to deviate from these. For the case of a relative trench length equal to eight, the numerical results differ from the planewave solution, which diverge from the values using Miles (1982) for this case where the assumptions are violated. 1 000 0 99 0 996 0. 9 4 0 9 0. 4 (a)
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34 the reflection and transmission coefficients for waves over a trench compared to the no current case Adverse currents and following currents made a trench less reflective and more reflective respectively (Kirby et al., 1987). 2.4.1.2 3Dimensional methods Extending the infinite trench and step solutions ( one horizontal dimension) to a domain with variation in the longshore (twohorizontal dimensions) is a natural progression allowing for the more realistic case of wave transformation by a finite object or depth anomaly to be studied Changes in bathymetry can cause changes in wave height and direction through the four wave transformation processes noted earlier. Some of the twodimensional models study only the wave transformation while others use the modified wave field to determine the impact of a pit or shoal on the shoreline Several models use only a few equations or matching conditions on the boundary of the pit or shoal to determine the wave field and in some cases the impact on the shoreline in a simple domain containing a pit or shoal. Other much more complex and complete models and program packages have been developed to solve numerically for the wave field over a complex bathymetry which may contain pits and/or shoals. Both types of models can provide insight into the effect of a pit or shoal on the local wave field and the resulting impact on the shoreline. The wave transformation in a threedimensional domain was investigated in a study by Black and Mei (1970) which solved for the radially symmetric case of a submerged or floating circular cylinder in cylindrical coordinates A series of Bessel functions was used for the incident and reflected waves as well as for the solution o v er the shoal with modified Bessel functions representing the evanescent modes As mentioned previously in the 2D section, a variational approach was used and both the
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35 radiation by oscillating bodies and the disturbance caused by a fixed body were studied. The focus of the fixed body component of the study was the total scattering cross section, Q, which is equal to the width between two wave rays within which the normally incident wave energy flux would be equal to that scattered by the obstacle and the differential scattering crosssection which shows the angular distribution of the scattered energy (Black and Mei, 1970). Figure 221 shows the total scattering cross section for a circular cylinder at the seabed for three ratios of cylinder radius (a) to depth over the cylinder (h) 0 2 3 ka 4 5 6 Figure 221: Total scattering cross section of vertical circular cylinder on bottom (modified from Black et al., 1971). Williams (1990) developed a numerical solution for the modification oflong waves by a rectangular pit using Green's second identity and appropriate Green s functions in each region that comprise the domain. This formulation accounts for the diffraction, refraction and reflection caused by the pit. The domain for this method
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36 consists of a uniform depth region containing a rectangular pit of uniform depth with vertical sides. The solution requires discretizing the pit boundary into a finite number of points at which the velocity potential and the derivative of the velocity potential normal to the boundary must be determined. Applying matching conditions for the pressure and mass flux across the boundary results in a system of equations amenable to matrix solution techniques. Knowledge of the potential and derivative of the potential at each point on the pit boundary allows determination of the velocity potential solution anywhere in the fluid domain. The effect of a pit on the wave field is shown in a contour plot of the relative amplitude in Figure 222. A partial standing wave pattern of increased and decreased relative amplitude is seen seaward of the pit with a shadow zone of decreased wave amplitude landward of the pit flanked by two areas of increased relative amplitude McDougal et al. (1996) applied the method of Williams (1990) to the case of a domain with multiple pits. The first part of the study reinvestigated the influence of a single pit on the wave field for various pit geometries. A comparison of the wave field in the presence of a pit versus a surface piercing structure is presented in Figures 223 and 224, which present contour plots of the transformation coefficient, K, (equal to relative amplitude) that contain the characteristics discussed in the last paragraph. For this case with the pit depth equal to 3 times the water depth a greater sheltering effect is found (K = 0.4) landward of the pit than for the case of the full depth breakwater. An analysis of the effect of various pit characteristics on the minimum value of K found in the domain was also performed. The dimensionless pit width, a/L, (a= cross shore dimension, L =wavelength outside pit) was found to increase the distance to the
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37 region where K < 0 5 behind the pit and the value ofK was found to decrease and then become approximately constant as a/L increases. The minimum values of the transformation coefficient for a wide pit are much lower than those values found in Lee and Ayer (1981) and Kirby and Dalrymple (1983a) which may be explained by the refraction divergence that occurs behind the pit in the 2D case (McDougal et al. 1996). Figure 222 : Contour plot ofrelative amplitude in and around pit for normal incidence ; k i/ d = n/10 h/d = 0.5 b / a = l a/d = 2 a = crossshore pit length b = longshore pit length h = water depth outside pit, d = depth inside pit L 2 = wa v elength outside pit. (Williams 1990)
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38 The effect of the dimensionless pit length, b/L, indicates that K decreases as b/L increases to 1 with a change in the trend, and an increase in K, from b/L = 0.55 to b/L = 0.65. Increasing the dimensionless pit depth, d/L, was found to decrease the minimum value ofK with a decreasing rate. The incident wave angle was not found to significantly alter the magnitude or the location of the minimum K value, although the width of the shadow zone changes with incident angle. For the case of multiple pits, it was found that placement of one pit in the shadow zone of a more seaward pit was most effective in reducing the wave height. However, adding a third pit did not produce significant wave height reduction as compared to the twopit results. Williams and Vazquez (1991) removed the long wave restriction of Williams (1990) and applied the Green's function solution method outside of the pit. This solution was matched to a Fourier expansion solution inside the pit with matching conditions at the pit boundary. Once again the pit boundary must be discretized into a finite number of points and a matrix solution for the resulting series of equations was used. Removing the shallow water restriction allowed for many new cases to be studied, as the wave conditions approach deep water, the influence of the pit diminishes. A plot of the minimum and maximum relative amplitude found in the domain versus the dimensionless pit length (the wave number outside of the pit times the crossshore pit dimension, koa) is shown in Figure 225. The maximum and minimum relative amplitudes in Figure 225 are seen to occur near k 0 a = 2n or when L = a and then approach unity as the dimensionless pit length increases. The reason that the extreme values do not occur exactly at koa = 2n is explained by Williams and Vazquez (1991) as due to diffraction effects near the pit modifying the wave characteristics.
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39 Figure 223: Contour plot of diffraction coefficient in and around pit for normal incidence; a/L=l b/L=0.5, d/h = 3 kh=0 167 (McDougal et al., 1996). Figure 224 : Contour plot of diffraction coefficient around surfacepiercing breakwater for normal incidence ; a/L=l b / L=0.5, kh=0 167 (McDougal et al., 1996).
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40 1 2 Q) "O I I r1 r1 I j ~., I .,1 113 11$ r1 Q) P:: 0 6 ~7 1 o ~..., 0 2 10 I 111 I U 20 Figure 225: Maximum and minimum relative amplitudes for different koa, for normal incidence, a/b=6, a/d=n, and d/h=2. (modified from Williams and Vasquez, 1991). 2.4.2 Numerical Methods The previous threedimensional solutions, while accounting for most of the wave transformation processes caused by a pit, are simple in their representation of the bathymetry and their neglect of many waverelated processes including energy dissipation. Berkhoff (1972) developed a formulation for the 3dimensional propagation of waves over an arbitrary bottom in a vertically integrated form that reduced the problem to twodimensions. This solution is known as the mild slope equation and different forms of the solution have been developed into parabolic (Radder, 1979), hyperbolic, and elliptic (Berkhoff et al., 1982) models of wave propagation, which vary in their approximations and solution techniques. Numerical methods allow solution for wave propagation over an arbitrary bathymetry. Some examples of the parabolic and elliptic
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41 models are RCPWA VE (Ebersole et al., 1986), REF/DIF1 (Kirby and Dalrymple, 1994), and MIKE 21 's EMS Module (Danish Hydraulics Institute, 1998). Other models such as SW AN (Holthuijsen et al., 2000) and STWAVE (Smith et al., 2001) model wave transformation in the nearshore zone using the waveaction balance equation. These models provide the capability to model wave transformation over complicated bathymetries and may include processes such as bottom friction, nonlinear interaction, breaking, wavecurrent interaction, windwave growth, and white capping to better simulate the nearshore zone. An extensive review of any of the models is beyond the scope of this paper; however, a brief outline of the capabilities of some of the models is presented in Table 1. Maa et al. (2000) provides a comparison of six numerical models. Two parabolic models are examined: RCPWAVE and REF/DIF1 RCPWAVE employs a parabolic approximation of the elliptic mild slope equation and assumes irrotationality of the wave phase gradient. REF/DIF1 extends the mild slope equation by including nonlinearity and wavecurrent interaction (Kirby and Dalrymple, 1983b; Kirby, 1986). Of the four other models included, two are defined by Maa et al. (2000) as based on the transient mild slope equation (Copeland 1985; Madsen and Larson, 1987) and two are classified as elliptic mild slope equations (Berkhoff et al., 1982) models. The transient mild slope equation models presented are Mike 21 's EMS Module and the PMH Model (Hsu and Wen, in review). The elliptic mild slope equation models use different solution techniques with the RDE Model (Maa and Hwung, 1997 ; Maa et al. 1998a) applying a special Gaussian elimination method and the PBCG Model employing a Preconditioned Biconjugate Gradient method (Maa et al., 1998b).
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42 T bl 2 1 C bTf a e apa 1 1 1es o f 1 t d se ec e nears ore wave mo e s. h d 1 RCP W AVE REF/DIF1 Mike 21 ~E MS STWAVE SW AN~ 3 rd Gen Parabolic Parabolic Elliptic Mild Conservation Conservation Solution Slope Equation Mild Slope Mild Slope of Wave of Wave Method (Berkhoff et al. Equat i on Equat i on Action Act i on (1972) Phase Averaged Resolved Resolved Averaged Averaged No No Sgectral No Yes Yes Use REF / DIFS Use NSW unit Shoaling Yes Yes Yes Yes Yes Refract i on Yes Yes Yes Yes Yes Yes Yes Yes No Diffraction No (SmallAngle) (WideAngle) (Total) (Smoothing) Yes Yes Yes Reflection No No (Forward only) (Total) (Specula r) Stable Energy Stable Energy Bore Model: Depth limited: Bore Model : Breaking Flux: Dally et Flux : Dally et al. Battjes & Miehe (1951) Battjes & Janssen al. ( 1 985 ) (1985 ) Janssen (1978) criterion (1 978 ) WhiteKamen et al. ( 1984), No No No Resio (1987) Janssen (1991 ) cagging Kamen et a l. ( 1994) Dalrymple et al. Quadratic Hasselmann et al. Bottom (1984) both Friction Law (1973) Co lli ns No No Friction laminar and Dingemans (1 972 ), Madsen e t turbulent BBL (1983) a l. ( 1988 ) Currents No Yes No Yes Yes Cava l er i & Mala n otteR i zzoli Wind No No No Resio (1988) (1981 ), Snyde r et a l., (1981 ), Janssen e t a l. (1 989 1991) Availability Commercia l Free Commercial Free Free
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43 A table in Maa et al. (2000) provides a comparison of the capabilities of the six models A second table summarizes the computation time memory required and where required, the number of iterations for a test case of monochromatic waves over a shoal on an incline; the Berkhoff et al. (1982) shoal. The parabolic approximation solutions of REF/DIF and RCPW A VE required significantly less memory (up to 10 times less) and computation time (up to 70 times less) than the elliptic models, which is expected due to the solution techniques and approximations contained in the parabolic models The required computation times and memory requirements for the transient mild slope equation models were found to be intermediate to the other two methods. Wave height and direction were calculated in the test case domain for each model. The models based on the transient mild slope equation and the elliptic mild slope equation were found to produce almost equivalent values of the wave height and direction. The parabolic approximation models were found to have different values with RCPW A VE sho w ing different wave heights and directions behind the shoal and REF/DIF showing good wave height agreement with the other methods but no change in the wave direction behind the shoal. Plots of the computed wave heights for the six models and experimental data along one transect taken perpendicular to the shoreline and one transect parallel to the shoreline are shown in Figures 226 and 227 Onl y four results are plotted because the RDE model the PMH model and PBCG model produced almost identical results. The wave directions found with REF/DIF1 in Maa et al. (2000) were found to be in error by Grassa and Flores (2001) who demonstrated that a second order parabolic
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44 model, equivalent to REF/DIF1 was able to reproduce the wave direction field behind a shoal such as in the Berkhoff et al. (1982) experiment. 0 I 5: Longshore (m) Figure 226: Comparison of wave height profiles for selected models along transect parallel to shore located 9 m shoreward of shoal apex[ =experimental data] (Maa et al., 2000). 0 1 s ,~~~ 0 0 d \ .. .... . ..._ ..... . .. RCP A 6 tom 8 0 2 1 4 Cross Shore ( m ) Figure 227: Comparison of wave height profiles for selected models along transect perpendicular to shore and through shoal apex [ =experimental data] (Maa et al., 2000).
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45 Application of numerical models to the problem of potential impact on the shoreline caused by changes to the offshore bathymetry was conducted by Maa and Hobbs (1998) and Maa et al. (2001). In Maa and Hobbs (1998) the impact on the coast due to the dredging of an offshore shoal near Sandbridge, Virginia was investigated using RCPWA VE. National Data Buoy Center (NDBC) data from an offshore station and bathymetric data for the area were used to examine several cases with different wave events and directions The resulting wave heights, directions, and sediment transport at the shoreline were compared. The sediment transport was calculated using the formulation of Gourlay (1982), which contains two terms, one driven by the breaking wave angle and one driven by the gradient in the breaking wave height in the longshore direction Section 2 5.4 provides a more detailed examination of the longshore transport equation with two terms. The study found that the proposed dredging would have little impact on the shoreline for the cases investigated. Later, Maa et al. (2001) revisited the problem of dredging at the Sandbridge Shoal by examining the impact on the shoreline caused by three different borrow pit configurations. RCPW A VE was used to model the wave transformation over the shoal and in the nearshore zone. The focus was on the breaking wave height; wave direction at breaking was not considered. The changes in the breaking wave height modulation (BHM) along the shore after three dredging phases were compared to the results found for the original bathymetry and favorable or unfavorable assessments were provided for ensuing impact on the shoreline. The study concluded that there could be significant differences in the wave conditions, revealed by variations in the BHM along the shoreline depending on the location and extent of the offshore dredging
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46 Regions outside the inner surf zone have also been studied through application of nearshore wave models. Jachec and Bosma (2001) used the numerical model REF/DIFS (a spectral version ofREF/DIF1) to study borrow pit recovery time for seven borrow areas located on the inner continental shelf off New Jersey. The input wave conditions were obtained from Wave Information Study (WIS) data with nearshore bathymetry for the existing conditions and also different dredging scenarios Changes in the wave induced bottom velocity were obtained from the wave height and direction changes determined by REF/DIFS. The waveinduced bottom velocities were coupled with ambient nearbottom currents to determine the sediment transport and then recovery times of the borrow areas. The recovery times from the numerical modeling were the same order of magnitude as recovery times estimated from two independent data sets of seafloor change rates offshore of New Jersey. 2 5 Shoreline Response 2.5.1 Longshore Transport Considerations The previous discussion on one and twodimensional models focused first on simple and complex methods of determining the wave transformation caused by changes in the offshore bathymetry and then applications that determined the changes to the wave height, direction and even longshore transport at the shoreline. However, none of the applications were intended to determine the change in shoreline planforms due to an anomaly or a change in the offshore bathymetry With wave heights and directions specified along the shoreline sediment transport can be calculated and, based on the gradients in longshore transport the changes in shoreline position can be determined The longshore transport can be driven by two terms as was discussed previously in the review of Maa and Hobbs (1998). In most situations where the offshore
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47 bathymetry is somewhat uniform, the magnitude and direction of the longshore transport will depend mostly on the wave height and angle at breaking as the longshore gradient in the breaking wave height will be small. In areas with irregular bathymetry or in the presence of structures, the transformation of the wave field can lead to areas of wave focusing and defocusing resulting in considerable longshore gradients in the wave height. Longshore transport equations containing a transport term driven by the breaking wave angle and another driven by the longshore gradient in the wave height can be found in Bakker (1971), Ozasa and Brampton (1980), who cite the formulation of Bakker (1971), Gourlay (1982), Kraus and Harikai(1983), and Kraus (1983). While the value of the coefficient for the transport term driven by the gradient in the wave height is not well established, the potential contribution ofthis term is significant. It is shown later that under steady conditions the diffusive nature of the angledriven transport term is required to modify the wave height gradient transport term in order to generate an equilibrium planform when the two terms are both active. 2.5.2 Refraction Models 2.5.2.1 Motyka and Willis (1974) Motyka and Willis (1974) were one of the first to apply a numerical model to predict shoreline changes due to altered offshore bathymetry. The model only included the effect of refraction caused by offshore pits for idealized sand beaches representative of those found on the English Channel or North Sea coast of England. A simplified version of the Abernethy and Gilbert (1975) wave refraction model was used to determine the transformation of uniform deep water waves over the nearshore bathymetry. The breaking wave height and direction were calculated and used to determine the sediment transport and combined with the continuity equation to predict
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48 shoreline chang e The longshore transport was calculated using the Scripps Equation as modified by Komar (1969): Q 0.045 H 2 C ( 2 ) = pg b g sm a b Y s (21) where Q is the volume rate oflongshore transport Y s is the submerged unit w ei ght of the beach material pis the density of the fluid Hb is the breaking wave height C g is the group velocity at breaking and ab is the angle of the breaking wave relative to the shoreline. This form of the Scripps Equation combines the transport and porosity coefficients into one term; the values used for either parameter was not stated. This process was repeated to account for shoreline evolution with time. Figure 228 shows a comparison of the predicted shorelines for the equivalent of two years of waves o v er 1 m and 4 m deep pits with alongshore extent of 880 m and a crossshore extent of 305 m. The detailed pit geometries were not specified 30 W4TER DEPTH(m) DISTANCE OFFSHORE (m) E 17 08 21,0 1 7 52 3050 20 ...l .w 10 ...l co g op=raa.ti...a.~.~====="~=,.,...(!) ~ 10 ,I (I) H 20 0 ..c: UJ 30 o 0 Pit depth = 1 m Pit depth = 4 m 500 I 1000 1500 2 0 00 2500 3000 DISTANCE ALONG SHORE m PLANSHAPE OF BEACH DU E T O REFRA C TION OVER DREDGED HOLE 27,0m OFFSHOR E t500 Figure 228 : Calculated beach planform due to refraction after two years of prototype waves for two pit depths (modified from Motyka and Willis 1974).
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49 The model determined that erosion occurs shoreward of a pit, with adjacent areas of accretion. For the wave conditions used, stability was found after an equivalent period of two years. During the runs, "storm" waves (short period and large wave height) were found to cause larger shoreline changes than the "normal" waves with longer periods and smaller heights, which actually reduced the erosion caused by the storm waves. The erosion shoreward of the pits is shown in Figure 228 with more erosion occurring for the deeper pit. 2.5.2.2 Horikawa et al. (1977) Horikawa et al. (1977) developed a mathematical model for shoreline changes due to offshore pits. The model applies a refraction program and the following equation for the longshore sediment transport: Q 0.77pg H 2 C ( 2 ) b sm ab 16(p p)(l,1,) g (22) where')... is the porosity of the sediment. Equation 22 is identified as the Scripps Equation in Horikawa et al. (1977); however, to match the Scripps Equation and for a dimensionally correct expression, the g term in the numerator should be removed. A model by Sasaki (1975) for diffraction behind breakwaters was modified to account for refraction only. The model computes successive points along the wave ray paths. Interpolation for the depth and slope is used along the ray path with an iteration procedure to calculate each successive point. The wave conditions were selected to be typical of the Eastern Japan coast facing the Pacific Ocean. Several pit dimensions and pit locations were used with the longshore dimension of the pit ranging from 2 km to 4 km, a crossshore length of2 km, pit depth of 3 m and water depths at the pit from 20 m to 50 m
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50 For the configurations modeled accretion was found directly shoreward of the pit flanked by areas of erosion. The magnitude of the accretion behind the pit and the erosion in the adjacent areas were found to increase with increasing longshore pit length and for pits located closer to shore. The shoreline planform for a model after the equivalent of 2 years of waves is shown in Figure 229 with a salient directly shoreward of the pit. E A FTER 2 YE A RS 2 k m 41 ... 0 4 2 ._____..____._ _,_ _,__.,___..__._ _._ ___.__. S 4 3 2 I 0 2 3 4 5 Longshore d i stance from center of dredged hole (km) Figure 229: Calculated beach planform due to refraction over dredged hole after two years of prototype waves (Horikawa et al., 1977) Although Horikawa et al. state that good qualitative agreement was found with Motyka and Willis (1974), the results were the opposite with Horikawa et al. and Motyka and Willis (1974) predicting accretion and erosion shoreward of a pit, respectively. The proposed reason for the accretion given in Horikawa et al. was that sand accumulates behind the pit due to the quiet water caused by the decrease in wave action behind the pit. However, a model that considers only refraction caused by a pit and only includes a transport term dependent on the breaking wave angle would have wave rays that diverge over the pit and cause sand to be transported away from the area behind the pit resulting
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51 in erosion. The two models used different refraction programs and basically the same transport equation with Horikawa et al. having a pit that was 2 or 3 times as large, lying in deeper water and with longer period incoming waves. The refraction grid was 250 m square in the Horikawa et al. model and 176 m square in Motyka and Willis. Regardless of the differing results from Motyka and Willis, the mathematical model results of Horikawa et al. follow the trend of the lab results contained in that study showing accretion behind a pit (Figure 230); however, the aforementioned anomalous prediction of accretion considering only wave refraction remains E u HOLE C: 41 1 L E ., u 0 0. Ill "O ., ... 0 .s:: Ill 0 4 2 0 2 4 0 20 40 60 Longshore distance from center of dredged hole (cm) Figure 230: Comparison of changes in beach plan shape for laboratory experiment and numerical model after two years of prototype waves (Horikawa et al., 1977). 2 5.3 Refraction and Diffraction Models 2. 5. 3 .1 Grav ens and Rosati ( 1994) Gravens and Rosati (1994) performed a numerical study of the salients and a set of offshore breakwaters at Grand Isle, Louisiana (Figures 21 and 22). Of particular interest is the analysis and interpretation of the impact on the wave field and the resulting
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52 influence on the shoreline, of the "dumbbell" shaped planform borrow area located close to shore. The report employs two numerical models to determine the change in the shoreline caused by the presence of the offshore pits: a wave transformation numerical model (RCPW A VE) and a shoreline change model (GENESIS (Hanson, 1987, Hanson, 1989)) using the wave heights from the wave transformation model. RCPW A VE was used to calculate the wave heights and directions from the nominal 12.8 m contour to the nominal 4.3 m contour along the entire length of the island for 3 different input conditions. Figures 231 and 232 show the wave height transformation coefficients and wave angles near the pit (centered about alongshore coordinate 130). Significant changes in the wave height and direction are found near the offshore borrow area. The shadow zone centered at Cell 130 suggests the presence of one large offshore pit as opposed to the "dumbbell" shaped borrow pit for the project described in Combe and Soileau (1987). The shoreline changes were calculated using a longshore transport equation with two terms; one driven by the breaking wave angle, and one driven by the longshore gradient in the breaking wave height. Each of these terms includes a dimensionless transport coefficient. In order for GENESIS to produce a salient leeward of the borrow pit, an unrealistically large value for the transport coefficient associated with the gradient in the breaking wave height (K 2 = 2.4) was needed, whereas 0.77 is the normal upper limit. While a single salient was modeled after applying the large K 2 value, the development of two salients leeward of the borrow pit, as shown in Figures 21 and 22, did not occur. The nearshore bathymetric data used in the modeling was from surveys taken in 1990 and 1992. Significant infilling of the borrow pit occurred prior to the
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53 surveys in 1990 and 1992; however, details of how the pit filled over this time period are not known. Ncanbore Wave Height Truaformation Coeffic.icnu An&lc Bltld 5 Period Band 2 S 3+1.4 5 11.2 OJI 0 6 100 110 120 l'.l0 1 40 150 160 Aloapl,cre Coonlia&tc (c:ell ll)ICUII 100 ft) Figure 231: Nearshore wave height transformation coefficients near borrow pit from RCPWAVE study (modified from Gravens and Rosati, 1994) Neanbore Wave AoJlcs 15 ,..,..,..,, Ao&)cB.andjl'fflodllal>d2 .s tt 3 " .S I ..10 ... .>I 0 < l;' ; S .,o 100 110 120 130 140 150 160 Awq.borc Cocxdm&le (c:
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54 The authors proposed that the salient was formed by the refractive divergence of the wave field created by the borrow pit that resulted in a region of low energy directly shoreward of the borrow area and regions of increased energy bordering the area The gradient in the wave energy will result in a circulation pattern where sediment mobilized in the highenergy zone is carried into the low energy zone For GENESIS to recreate this circulation pattern K 2 must be large enough to allow the second transport term to dominate over the first transport term 2 5.3.2 Tang (2002) Tang (2002) employed RCPW A VE and a shoreline modeling program to evaluate the shoreline evolution leeward of an offshore pit. The modeling was only able to generate embayments in the lee of the offshore pits using accepted values for the transport coefficients This indicates that wave reflection and/or dissipation are important wave transformation processes that must be included when modeling shoreline evolution in areas with bathymetric anomalies 2.5.4 Refraction, Diffraction, and Reflection Models 2.5.4.1 Bender (2001) A study by Bender (2001) extended the numerical solution of Williams (1990) for the transformation of long waves by a pit to determine the energy reflection and shoreline changes caused by offshore pits and shoals. An analytic solution was also developed for the radially symmetric case of a pit following the form of Black and Mei (1970 ). The processes of wave refraction wave diffraction and wave reflection are included in the model formulations however wave dissipation is not. Both the numerical and analytic solutions provide v alues of the complex velocity potential at any point which allows determination of quantities such as velocity and pressure.
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55 The amount of reflected energy was calculated by comparing the energy flux through a transect perpendicular to the incident wave field extending to the pit center to the energy flux through the same transect with no pit present (Figure 233). The amount of energy reflected was found to be significant and dependent on the dimensionless pit diameter and other parameters. Subsequently a new method has been developed which allows the reflected energy to be calculated using a farfield approximation with good agreement between the two methods. Pit Diameter/Wavelength(inside pit d) 0 26 0 2 0 4 0 6 0 8 1 1 2 1 4 1 6 1 8 2 r. + (radius = 6 m) 0 24 o (radius= 12 m) 0 (radius = 25 m) 0 22 x (radius= 30 m) <> (radius= 75 m) 0 2 0 c o Q) u 0 18 X :E Q) 0 U 0 16 + C + 0 ~ X 0 14 + Q) a:: 0 12 + + X 0 1 + 0 08 + 0 06 0 0 5 1 5 2 2 5 3 Pit Diameter/Wavelength(outside pit h) Figure 233: Reflection coefficients versus dimensionless pit diameter divided by wavelength inside and outside the pit; water depth= 2 m, pit depth = 4 m (Bender, 2001). The shoreline changes caused by the pit were calculated using a simple model that considers continuity principles and the longshore transport equation with values of the wave height and direction determined along a transect representing the shoreline. A nearshore slope and no nearshore refraction were assumed. The impact on the shoreline
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56 was modeled by determining the wave heights and directions along an initially straight shoreline then calculating the transport and resulting shoreline changes. After updating the shoreline positions the transport resulting shoreline changes, and updated shoreline positions were recalculated for a set number of iterations after which the wave transformation was recalculated with the new bathymetry and values of the wa v e hei g ht and direction were updated at the modified breaker line The impact on the shoreline was found to be highly dependent on the transport coefficients. Considering transport driven only by the breaking wave angle and wave height, erosion was found to occur directly leeward of the pit flanked by two areas of accretion as in Mo ty ka and Willis (1974). Following an initial advancement directly shoreward of the pit erosion occurs and an equilibrium shape was reached E x amining only the effect of the second transport term (driven by the longshore gradient in the wave height) accretion w as found directly shoreward of the pit with no equilibrium planform achieved. Figure 2 34 shows the shoreline evolution for each transport term. Including both transport terms with the same transport coefficients resulted in a shoreline with accretion directly shoreward of the pit that was able to reach an equilibrium state (Figure 235). The twoterm transport equation used to determine the shoreline in Figure 235 is Q K H i' .J sin{0 a }cos{0 a ) K H i' .J cos(0 a ) dH ~ ~ (23) where H b is the br e aking wave height g is gravity K is the breaking index, 0 is the shoreline orientation a is the breaking wave angle m is the beach slope, s and p are the specific gravity and porosity of the sediment, respectively, and K 1 and K 2 are sediment
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57 transport coefficients, which were set equal to 0.77 for the results presented here. A review of the development of Eq. 23 is contained in Appendix D. F i rst Transport Term (wave angle) 200 ~~ 150 100 I Q) 50 C o O I!! 0 .c "' g> .50 .3 100 150 Erosion 2 00 ~~79 5 80 80 5 81 Shoreline Position (m ) Second Transport Term (dHb/d x ) 200 rTrT.., 150 100 50 0 50 100 150 200~ ~+40 60 80 100 120 Shoreline Posit i on (m) Figure 234: Shoreline evolution resulting from each transport term individually for transect located 80 m shoreward of a pit with a radius = 6 m, last time step indicated with [+] (modified from Bender and Dean, 2001). In application the wave height and angle calculations were limited to a uniform depth region; therefore no nearshore shoaling and refraction was performed to resolve the depth limited breaking values. The wave height and angle values at the transect location representing the shoreline were assumed to be the values at breaking; this limitation is removed in the model developed in Section 6.10. In these figures the water depth and pit depth were 2 m and 4 m, respectively, the period was 10 s the incident wave height was 1 m, and averaging over 5 wave directions was used to smooth out the longshore variation in the wave height at large distances from the pit. The time step was 120 sand 10 iterations of shoreline change were calculated between wave height and direction updates for a total modeling time of 48 hours. The
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58 diffusive nature of the angledriven transport term is seen to modify the much larger wave height gradient transport term in order to generate an equilibrium planform when the two terms are used together. Comparison of these results with those described earlier establishes the significance of wave reflection and the second transport term on the equilibrium planform. Full Transport Equation (both tenns) 200 150 100 I 50 ., u C: "' 1i, i5 0 ., I:) ,::; "' Cl 8 50 ...J 100 150 Erosion 200 78 78 5 79 79 5 80 80 5 81 81 5 82 Shoreline Position (m) Figure 235: Shoreline evolution using full transport equation and analytic solution model for transect located 80 m shoreward of a pit with a radius = 6 m, last time step indicated with[+] (modified from Bender and Dean, 2001).
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CHAPTER3 2DIMENSIONAL MODEL THEORY AND FORMULATION 3 .1 Introduction The reflection and transmission of normally incident waves by twodimensional trenches and shoals of finite width with sloped transitions between the depth changes are studied. Prior twodimensional studies, outlined in Chapter 2 have all investigated the interaction of water waves with changes in bathymetry that have featured domains with an abrupt transition, with the exception of Dean (1964) and Lee et al. (1981 ). A more realistic representation of natural trenches and shoals should allow for gradual transitions (sloped sidewalls) The focus of the 2dimensional study is the propagation of water waves over a 2D trench or shoal of more realistic geometry This will extend the study of Dean (1964) that investigated long wave modification by a sloped step and Lee et al. (1981), which did not directly address the effect of the transition slope on the reflection and transmission coefficients. Three solution methods are developed for linear water waves: (1) the step method, (2) the slope method and (3) a numerical method The step method is valid in arbitrary water depth while the slope method and the numerical method are valid only for shallow water conditions. The step method is an extension of the Takano (1960) eigenfunction expansion solution as modified by Kirby and Dalrymple (1983a) that allows for a trench or shoal in arbitrary depth with "stepped" transitions that approximate a specific slope or shape The slope method extends the long wave solution 59
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60 of Dean (1964) that allows for linear transitions between the changes in bathymetry for a trench or shoal creating regular or irregular trapezoids. The numerical method employs a backward spacestepping procedure for arbitrary (but shallow water) bathymetry with the transmitted wave specified. 3 2 Step Method: Formulation and Solution The twodimensional motion of monochromatic, smallamplitude water waves in an inviscid and irrotational fluid of arbitrary depth is investigated. The waves are normally incident and propagate in an infinitely long channel containing a two dimensional obstacle (trench or shoal) of finite width. Details of the fluid domain and the formulation of the solution vary depending on the case studied: abrupt transition or gradual transition with the slope approximated by the step method. The step method is an extension of the Takano (1960) formulation for the propagation of waves over a rectangular sill. The eigenfunction expansion method of Takano (1960) was extended in Kirby and Dalrymple (1983a) to allow for oblique wave incidence and again in 1987 by Kirby et al. to include the effects of currents along the trench. In the present formulation the method ofTakano, as formulated in Kirby and Dalrymple (1983a), was generally followed for normal wave incidence. The solution starts with the definition of a velocity potential: ~ iat /x,z,t) = /x,z)e (J=l J) (31) where j indicates the region, J is the total number of regions (3 for the case of a trench or sill with an abrupt transition), and cr is the angular frequency. The velocity potential must satisfy the Laplace Equation:
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61 2 +2 (x, z )= 0 ( a 2 a 2 J ax a z the freesurface boundary condition : a(x, z ) + a2 = 0 a z g and the condition of no fl.ow normal to any solid boundary: a ,z ) =O an The velocity potential must also satisfy radiation conditions at large l xl. (32) (33) (34) The boundary value problem defined by Eq. 32, the boundary conditions of Eqs 33 and 34, and the radiation condition can be solved with a solution in each region of the form (J =I J), (n =I oo) (35) In the previous equation A 1 + is the incident wave amplitude coefficient, A 1 is the reflected wave amplitude coefficient and A/ is the transmitted wave amplitude coefficient. The coefficient B is an amplitude function for the evanescent modes (n = I oo) at the boundaries, which are standing waves that decay exponentially with distance from the boundary The values of the wave numbers of the propagat i ng modes, k j, are determined from the dispersion relation: (J = 1 J) (36) and the wave numbers for the evanescent modes, K j n are found from
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62 CY 2 = gK tan(K. h ) J,n J, n J (J = 1 J) (n = 1 oo) (37) In each region a complete set of orthogonal equations over the depth is formed by Eqs 35 to 37. To gain the full solution matching conditions are applied at each boundary between adjacent regions. The matching conditions ensure continuity of pressure: and continuity of horizontal velocity normal to the vertical boundaries : a
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63 where n j is the ratio of the group velocity to the wave celerity: n = 1+ 11 1 ( 2k h J 1 2 sinh(2k j h) (313) 3.2 1 Abrupt Transition The solution ofTakano (1960) for an elevated sill and that of Kirby and Dalrymple (1983a) for a trench are valid for abrupt transitions (vertical walls) between the regions of different depth. For these cases the domain is divided into three regions (J = 3) and the matching conditions are applied over the two boundaries between the regions. The definition sketch for the case of a trench with vertical transitions is shown in Figure 31 where Wis the width of the trench. L ~I Jl I Reg i on l I 1 Reg i on I w 'TIT X2 ht : Jl 2 2 I l Region 3 Figure 31 : Definition sketch for trench with vertical transitions. Takano constructed a solution to the elevated sill problem by applying the matching conditions [Eqs. 38 and 39] for a truncated series (n = 1 N) of eigenfunction expansions of the form in Eq 35. Applying the matching conditions results in a truncated set of independent integral equations each of which is multiplied by the appropriate eigenfunction; cosh[kj{h j +z)] or cos[ K j, n(h j +Z)] The proper eigenfunction to use depends on whether the boundary results in a "step down or a "step up" ; thereby
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64 making the form of the solution for an elevated sill different than that of a trench With one wave form specified the orthogonal properties of the eigenfunctions result in 4N+4 unknown coefficients and a closed problem. By applying the matching conditions at the boundary between Regions 1 and 2 (x = x 1 ) 2N+2 in t egral equations are constructed. For the case of a trench with vertical transitions (Figure 31) the resulting equations are of the form 0 0 fiCx, ,z )cosh[k,(h, + z )]d z = 2 (x, ,z )cosh[k,(h, + z )]d z (314) 0 0 f ( x z ) cos[K,)h, + z )]d z = f 2 (x, z ) cos[K 1 Jh 1 + z )]d z (n = 1 N) (315) (316) The limits of integration for the right hand side in Eqs. 316 and 317 are shifted from h 1 to h 2 as there is no contribution to the horizontal velocity for (h 2 z < h ) at x = x 1 and (h 2 z < h 3 ) at x = x2 for this case. In Eqs 314 and 315 the limits of integration for the pressure considerations are (h 1 z < 0) at x = x I and (h 3 z < O) at x = x 2 At the boundary between Regions 2 and 3 the remaining 2N + 2 equations are developed. For the case of a trench the downwave boundary is a "step up ", which
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65 requires different eigenfunctions to be used and changes the limits of integrations from the case of the "step down at the upwave boundary [Eqs 314 to 317] 0 0 J 2 ( x 2 ,z )cosh[k 3 (h 3 + z )]d z = f 3 ( x 2 ,z )cosh[k 3 (h 3 + z )]d z (318) 0 0 2 ( x 2 ,z )cos[K 3 Jh 3 + z )]d z = 3 (x 2 ,z )cos[K 3 Jh 3 + z )]d z (n = 1 N ) (319) (320) At each boundary the appropriate evanescent mode contributions from the other boundary must be included in the matching conditions The resulting set of simultaneous equations may be solved as a linear matrix equation. The value ofN (number of non propagating mod e s) must be large enough to ensure convergence of the solut i on. Kirby and Dalrymple (1983a) found that N = 16 provided adequate convergence for most 3.2.2 Gradual Transition The step method is an extension of the work by Takano (1960) and Kirby and Dalrymple (1983a) that allows for a domain with a trench or sill with gradual transitions (sloped sidewalls ) between regions. Instead of having a "step down and then step up" as in the Kirby and Dalrymple solution for a trench or the reverse for Takano s solut i on for an elevated sill in the step method a series of steps either up or down are connected by a constant depth region followed by a series of steps in the other direction. A sketch
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66 of a domain with a stepped trench is shown in Figure 32. In this method, as in the case of a trench or a sill, a domain with J regions will contain J1 steps and boundaries. t : t : t : h1 I h2 : h3 I I f I h I 5 I Figure 32: Definition sketch for trench with stepped transitions. TlTRegion 6 Each region will have a specified depth and each boundary between regions will have a specified x location where the matching conditions must be applied. At each boundary the matching conditions are applied and depend on whether the boundary is a "step up" or a "step down." With the incident wave specified, a set of equations with 2(Jl)N+2(J1) unknown coefficients is formed. The resulting integral equations are of the form: for (J = 1 J 1) if (h 1 > h 1 + 1 ) at x = Xj then the boundary is a "step down"; 0 0 f/x 1 ,z)cosh[k)h 1 +z)]dz = 1 + 1 (x 1 ,z)cosh[k)h 1 +z)]dz (322) 0 0 f /x 1 ,z )cos[K 1 )h 1 + z )]dz= f 1 + /x 1 z )cos[K 1 )h 1 + z )]dz (n = 1 N)(323)
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67 (n = 1 N) (325) if (h j < h j+ i) at x = X j then the boundary is a "step up"; 0 0 J/x j,z )cosh[k j+ 1 (h j+ l + z )]d z = j+ 1 (x j z )cosh[k j+ i(h j+ l + z )]d z (326) 0 0 J j ( x j, z ) cos[K j+ i )h j+ i + z )]d z = J j+ l (x j, z ) cos[K j+ i )h j+ t + z )]d z (n =1 N) (327) 0 J j ( x z ) cosh[k (h + z )]d z = 0 J j+ i (x 1 z ) cosh[k)h j + z )]d z a x l 11 ax h i h J+ I (328) (n = 1 N) (329) At each boundary (xj) the appropriate evanescent mode contributions from the adjacent boundaries (xjI, X j+ I) must be included in the matching conditions The resulting set of simultaneous equations is solved as a linear matrix equation with the value ofN large enough to ensure convergence of the solution. 3.3 Slope Method: Formulation and Solution The slope method is an extension of the analytic solution by Dean (1964) for long wave modification by linear transitions. Linear transitions in the channel width depth, and both width and depth were studied. The solution of Dean (1964) is valid for one linear transition in depth and/or width, which in the case of a change in depth allowed for
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68 an infinite step, either up or down to be studied. In the slope method a domain with two linear transitions allows the study of obstacles of finite width with sloped transitions The long wave formulation of Dean (1964) for a linear transition in depth was followed. By combining the equations of continuity and motion the governing equation of the water surface for long wave motion in a channel of variable crosssection can be developed. The continuity equation is a conservation of mass statement requiring that the net influx of fluid into a region during a time, ~t, must be equal to a related rise in the water surface Tl For a channel of uniform width b this can be expressed as [Q (x )Q( x + ~)~t = b~[ry(t + ~t)17(t)] (330) where Q(x) and Q(x + ~x) are the volume rates of flow into and out of the control volume respectively. The volume flow rate for the uniform channel can be expressed as the product of the cross sectional width A and the horizontal velocity u in the channel: Q =A u (331) By substituting Eq 331 into Eq 330 and expanding the appropriate terms in their Taylor series while neglecting higher order terms, Eq. 330 can be rewritten as a a 17 ( A u)=b ax a t (332) The hydrostatic pressure equation is combined with the linearized form of Euler's equation of motion to develop the equation of motion for small amplitude lon g waves. The pressure field p(x y t) for the hydrostatic conditions under long waves is p( x, z, t) = pg[17( x, t)z ] (333) Euler s equation of motion in the x direction for no body forces and linearized motion is 1 ap au =p ax a t (334)
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69 The equation of motion for small amplitude long waves follows from combining Eqs. 333 and 334: a 11 au g =ax a t (335) The governing equation is developed by differentiating the continuity equation [Eq 332] with respect to t: ~[ ~(Au)= b 8 77] ~[A au]= b 8 2 77 a t a x a t a x at 8t 2 (336) and inserting the equation of motion [Eq. 335] into the resulting equation, Eq. 336 yields the result (337) Eq. 337 is valid for any small amplitude, long wave form and expresses 11 as a function of distance and time. Eq. 337 can be further simplified under the assumption of simple harmonic motion: 77( x, t) = 77 1 ( x ) ei(at+a) (338) where a is the phase angle. Eq. 337 can now be written as (3 39) where the subscript 11 1 (x) has been dropped and the substitution, A= bh was made. 3.3.1 Single Transition The case o f a channel of uniform width with an infinitely long step either up or down was a specific case solved in Dean (1964). The definition sketch for a step down" is shown in Figure 33. The three regions in Figure 33 have the following depths :
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70 (340) Region 2, x 1 < x < x 2 ; (341) Region 3, x > x 2 ; h = h 3 (342) Region 1 Region 2 Region 3 Figure 33: Definition sketch for linear transition. For the regions of uniform depth, Eq. 339 simplifies to (343) which has the solution for ri of cos(kx) and sin(kx) where k = 2 1r and A is the wave ,.i length. The most general solution of ri(x,t) from Eq. 343 is (344) The wave form ofEq. 344 consists of two progressive waves of unknown amplitude and phase: an incident wave traveling in the positive x direction and a reflected wave traveling in the negative x direction. For the region oflinearly varying depth, Eq. 341 is inserted in Eq. 339 resulting in a Bessel equation of zero order:
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71 a 2 a x __!]__ + _!]_ + /317 = 0 ax 2 ax (345) where (346) The solutions of ri(x) for Eq 345 are (347) where J 0 and Y O are zeroorder Bessel functions of the first and second kind respectively. From Eq 347 the solutions for ri(x t) in Region 2 follow 17( x ,t) = B 3 J 0 (2/3 2 x I 1 2 ) cos( at + aJ + B 3 Y 0 (2,8 2 x 2 ) sin( at + a 3 ) + B 4 J 0 (2/3 1 1 2 x I 1 2 ) cos( at + a 4 ) B 4 Y 0 (2/3 1 1 2 x I 1 2 ) sin( at + a 4 ) (348) The wave system ofEq. 348 consists of two waves of unknown amplitude and phase; one wave propagating in the positive x direction (B 3 ) and the other in the negative x direction (B 4 ). The problem described by Figure 33 and Eqs. 344 and 348 contains eight unknowns: B1 4 and a 1 4 Solution to the problem is obtained by applying matching conditions at the two boundaries between the three regions. The conditions match the water surface and the gradient of the water surface: (349) a 17 j = 8 17 j+ l ax ax at x = x. J (J=l 2) (350)
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72 Eqs. 349 and 350 result in eight equations (four complex equations), four from setting CY t = 0 and four from setting CY t = n which can be solved for the eight 2 unknowns as a linear matrix equation. 3.3.2 Trench or Shoal The slope method is an extension of the Dean (1964) solution that allows for a domain with a trench or a sill with sloped transitions. Two linear transitions are connected by a constant depth region by placing two solutions from Dean (1964) "back to back." A trench/sill with sloped side walls can be formed by placing a "step down" upwave/downwave of a "step up." The definition sketch for the case of a trench is shown in Figure 34. In the slope method the depths are defined as follows Region 2, x 1 < x < x 2 ; hh 3 Region 5, x > x 4 ; h = h 5 (351) (352) (353) (354) (355) where h1, h3, hs, s1, s2, and Ware specified. With the new definition for the depth in 2 regions 2 and 4, the definition of the coefficient pin Eq. 345 changes to j3 = !!_ and gs, 2 /3 =!!_in regions 2 and 4, respectively. gs 2
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73 Region 1 Region 2 Region 3 Jtegion 4 Region 5 X x,. X2 X3 x, h l h i h 3 h, h s ' .__wFigure 34: Definition sketch for trench with sloped transitions. The matching conditions of Eqs. 349 and 350 are applied at the four boundaries between the regions. With the transmitted wave specified and by setting at = 0 and at = tr for each matching condition a set of 16 independent equations is developed. 2 Using standard matrix techniques the eight unknown amplitudes and eight unknown phases can then be determined. The reflection and transmission coefficients can be determined from (356), (357) Conservation of energy arguments in the shallow water region require K 2 + K 2 [K] = 1 R T Fi (358) This method can be extended to the representation of long wave interaction with any depth transition form represented by a series of line segments.
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74 3.4 Numerical Method: Formulation and Solution A numerical method was developed to determine the long wave transformation caused by a trench or shoal of arbitrary, but shallow water bathymetry. A transmitted wave form in a region of constant depth downwave of the depth anomaly is the specified input to the problem. Numerical methods are used to space step the wave form backwards over the trench or shoal and then into a region of constant depth upwave of the depth anomaly where two wave forms exist; an incident wave and a reflected wave. As in the long wave solution of Section 3, the continuity equation and the equation of motion are employed to develop the governing equation for the problem. The continuity equation and the equation of motion in the x direction are written in a slightly different form than in Eqs. 332 and 335 of Section 3.3: a77 aq x = at ax (359) gh a77 = aq x ax at (360) Taking the derivative of Eq. 359 with respect tot and the derivative of Eq. 360 with respect to x results in the governing equation for this method: a 2 77 gh a 2 77 g dh a77 = o at 2 ax 2 dx ax (361) where the depth, h, is a function ofx and ll may be written as a function of x and t: 7] = 77(x)eiar (362) Inserting the form of ll in Eq. 362 into the governing equation ofEq. 361 casts the equation in a different form (equivalent to Eq. 339) (363)
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75 Central differences are used to perform the backward space stepping of the numerical method. F" (x) = _F_:_(x_+_Lix___;_)__2 LixF'(:')_+_F_(x__Lix_) F'(x)= F(x+Lix)F(xLix) 2& Inserting the forms of the central differences into Eq. 363 for ri results in (364) (365) 77 (x) + gh [77(x + Lix)277(x) + 77(x&)] +L dh [77(x + Lix)77(xLix)] = 0 ( 3 66 ) a 2 & 2 a 2 dx 2& For the backward space stepping calculation, Eq. 366 can be rearranged 77 (x + Lix)[ g h + g dh l ]77 (x)[l_ 2 g h ] a 2 & 2 a 2 dx 2ix a 2 & 2 77 (xLix) = [ gh _ g dh l ] a 2 & 2 a 2 dx 2ix (367) To initiate the calculation, values of ri(x) and ri(x+Llx) must be specified in the constant depth region downwave from the depth anomaly. If the starting point of the calculation is taken as x = 0 then the initial values may be written as H 77(0) =2 77(&) = H [cos(kLix)i sin(kLix)] 2 (368) (369) The solution upwave of the depth anomaly comprises of an incident and reflected wave. The form of the incident and reflected waves are specified as (370) (371)
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76 where the E's are arbitrary phases. At each location upwave of the depth anomaly the total water surface elevation will be the sum of the two individual components : 17r =7], +7] R = H, cos(kxs,)cos(at)+sin(kxs,)sin(at) 2 + HR cos(kx & R) cos( at) sin(kx& R) sin( at) 2 cos(ot)[ :, cos(kxe,) + : cos(kxE,)] I +sin(oti[ :, sin(kxe,): sin(kxe,)] ff 1 (II) & =tan I Using several trigonometric identities, Eq. 372 can be reduced further to the form which is found to have maximum and minimum values of 17 rmin = (H, HR) Eqs 374 and 375 are used to determine the values ofH 1 and HR upwave of the trench/shoal, and allow calculation of the reflection and transmission coefficients. (372) (373) (374) (375)
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CHAPTER4 3DIMENSIONAL MODEL THEORY AND FORMULATION 4.1 Introduction The threedimensional motion of monochromatic, smallamplitude water waves in an inviscid and irrotational fluid of arbitrary depth is investigated. The waves propagate in an infinitely long, uniform depth domain containing a threedimensional axisymmetric anomaly (pit or shoal) of finite extent. The addition of the second horizontal dimension provides many new, and more practical, possibilities for study compared to the 2D model domains, which excluded longshore variation. Two different models are developed for the 3D domains that contain linear transitions in depth. The analytic step method is an extension of Bender (2001) that determines the wave transformation in arbitrary water depth for domains with gradual transitions in depth that are approximated by a series of steps of uniform depth The exact analytic model solves the wave transformation in shallow water for specific bathymetries that reduce the governing equations to known forms. 4.2 Step Method: Formulation and Solution The step method for a threedimensional domain is an extension of the Bender (2001) formulation for the propagation of waves past a circular anomaly with abrupt transitions. This method allowed oblique wave incidence, but was limited to the shallow water region Following Bender (2001) with significant changes in notation the governing equations for the threedimensional models are developed. 77
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78 Details of the fluid domain and the formulation of the solution vary depending on the case studied: abrupt transition in depth between regions or gradual transition with the slope approximated by the step method. The definition sketch for the case of a circular pit with an abrupt depth transition is shown in Figure 41 I Region 1 I z r I Region 1 I hi Figure 41: Definition sketch for circular pit with abrupt depth transitions. The domain is divided into regions with the bathymetric anomaly and its projection comprising Regions 2 Ns+ 1 where Ns is the number of steps approximating the depth transition slope and the rest of the domain, of depth h 1 in Region 1. For the case of an abrupt transition in depth the bathymetric anomaly occurs in Region 2 of uniform depth h 2 where abrupt is defined as one step either down or up. For the case of a gradual depth transition the bathymetric anomaly will be divided into subregions with the depth in each subregion equal to hj for each step j = 2 N s + 1
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79 The solution starts with the definition of a velocity potential in cylindrical coordinates that is valid in each Region j: where w is the wave frequency. (41) Linear wave theory is employed and Laplace s solution in cylindrical coordinates is valid: where the free surface boundary condition is and the bottom boundary condition is taken as a = o az at z = h 1 in Region 1 or z = h j in Region 2. (42) (43) (44) Separation of variables is used to solve the equations with the velocity potential given the form rp(r 0 ,z ) = R(r)0(0)Z( z ) (45) A valid solution for the dependency with depth is (46) where k j is the wa ve number in the appropriate region and h j is constant within each region. Inserting Eqs. 45 and 46 into the Laplace equation gives R "0 I 0 I 0 2 .. + R .. + .. R + R0k = 0 r r 2 (47)
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80 If the form of the dependence with 8 is assumed to be 0(0) = cos(m0) (48) then Eq. 47 may be reduced to r 2 R" + rR' + R(k 2 r 2 m 2 ) = 0 (49) which is a standard Bessel equation with solutions Jm(kr), Y m(kr), and Hm(kr) The dependency of the solution on 8 cancels out of Eq. 49; a result of the separation of variables approach The wave number is determined from the dispersion relation: ( 410) The standard Bessel solutions and the wave numbers ofEq. 410 represent the plane progressive wave component of the solution. Another solution is found when the dependence with depth is defined as Z(z) = cos(Kj(hj+z)) Inserting Eqs. 45 48 and 411 into the Laplace Equation gives r 2 R" + rR' R(K 2 r 2 + m 2 )= 0 (411) (412) which is a modified Bessel equation with solutions Km(Kr) and Im(Kr) where K is the wave number for the evanescent modes obtained using (413) where n indicates the number of the evanescent mode. The modified Bessel solutions and the wave numbers ofEq. 413 represent the evanescent mode solutions, which decay with distance from each interface between regions. The evanescent terms are included to account for the distortion of the plane wave near the interface (Black and Mei, 1970) and to extend the range of the solution into the arbitrary depth region.
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81 At each interface between changes in depth, matching conditions must be applied to ensure continuity of pressure: (r = rJ, (J = 1 NJ (414) and continuity of horizontal velocity normal to the vertical boundaries: (415) The matching conditions are applied over the vertical plane between the two regions: (h j z 0) if h j < h j+i or (h j+ i z 0) if h 1 > h 1 + The solution must also meet the radiation condition for large r: where / is the specified incident velocity potential. 4.2.1 Abrupt Transition (416) The solution method for an abrupt transition CNs = 1) will be shown first to illustrate the simplest case for the threedimensional step method. The definition sketch for the case of an abrupt transition is shown in Figure 42. The solution starts with the definition of an incident velocity potential in the form of a plane progressive wave: ( ) [ ~ ] cosh[k, (h, + z )] imr r,0,z,t =M, LJmcos(m0)J,,,(k,r) ( ) e 111=0 cosh k, h, (417) where Ym = 1 for m = 0 and 2im otherwise, M 1 = igH r is the radial distance from the 2m center of the bathymetric anomaly to the point in the fluid domain and 8 is the angle to the point measured counterclockwise from the 0 origin as shown in Figure 41.
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82 R _____________________ t 0 1 r i >ins R ! ! ! ! i Figure 42: Definition sketch for boundary of abrupt depth transition The scattered velocity potential consists of reflected modes that persist with substantial distance from the pit and evanescent modes, which decay rapidly with distance from the pit: ( 0 ) [ f, l cosh[k 1 (h 1 + z )] iw, s r, ,z,t = L..i A 111 cos(m0)H 1 111 (k 1 r) ( ) e m=o cosh k 1 h 1 (418) where H 1 m indicates the Hankel function of the first kind and m th order. Inside the pit the velocity potential is given the form ( ) [I 00 l cosh[k (h + z )] ,1, r 0 z t = B cos(m0)J (k r) 2 2 e,w, 'Pm s ' m Ill 2 h(k h ) m=O COS 2 2 (419)
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83 Am, am n Bm and ~m n are unknown amplitude coefficients that must be determined for each Bessel function mode included in the solution. The solution is obtained by applying the matching conditions of Eq. 414 and 415 at the single interface (r = R) between Regions 1 and 2 for two truncated series: (m = 1 M) and (n = 1 NJ. The velocity potential in Region 1 is the sum of the incident potential Eq. 417, and scattered potential Eq. 418. Applying the matching conditions results in a truncated set of independent integral equations each of which is multiplied by the appropriate eigenfunction ; cosh[kj(h j +z)] or cos[Kj n(h j +z)] The proper eigenfunction to use depends on w hether the boundary results in a step down or a "step up as r approaches zero; thereby making the form of the solution for a pit different than that of a shoal. With the incident wave form specified, the orthogonal properties of the eigenfunctions result in 2M(N e+ l) complex unknown coefficients and a closed problem where Mand N e are the number of Bessel modes and evanescent modes respectively, taken in the solution Applying the matching conditions at the interface between Regions 1 and 2 the necessary 2M(N e+ 1) equations are developed For the case of a pit ("step down") the resulting equations are of the form 0 0 f 1 (R ,z )cosh[k 1 (~ + z )] d z = f 2 (R ,z )cosh[k 1 (~ + z )] d z (420) 0 0 f, (R ,z )cos[K 1 )~ + z )]d z = f z(R ,z )cos[K 1 ,, (~ + z )] d z (n = 1 N J (421)
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84 (4 22) The limits of integration for the right hand side in Eqs. 422 and 423 are shifted from h 1 to h 2 as there is no contribution to the horizontal velocity for (h 2 z < h,) at the interface for a pit. In Eqs 420 and 421 the limits of integration for the pressure considerations are (h, z < 0) at r = R. For the case of a shoal ("step up") the resulting equations are of the form 0 0 1 (R, z )cosh[k 2 (h 2 + z )]d z = 2 (R ,z )cosh[ki{~ + z )]d z (424) 0 0 1 (R, z )cos[K 2 )h 2 + z )]d z = 2 (R, z )cos[K 2 ,,(~ + z )]d z (n = 1 N J (425) (426) (n = 1 N J (427) The limits of integration for the left hand side in Eqs 426 and 427 are shifted from h 2 to h1 as there is no contribution to the horizontal velocity for (h 1 z < h 2 ) at
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85 the interface for a shoal. In Eqs. 424 and 425 the limits of integration for the pressure considerations ar e (h 2 z < 0) at r = R. The resulting set of simultaneous equations is solved as a linear matri x equation The values ofM and N e must be large enough to ensure convergence of the solution. 4.2 2 Gradual Transition The step method extends the work of Bender (2001) by allowing a domain of arbitrary depth that contains a depth anomaly with gradual transitions (sloped sidewalls) between regions Instead of having a step down" from the upwave direction as in the Bender solution for a pit or a step up" for the case of a shoal, in the step method a series of steps either up or down of uniform depth are connected by a uniform depth region for r < r Ns A sketch of a domain with a stepped pit is shown in Figure 43 indicating the location and definition of the velocity potentials and boundaries for a pit with N s = 3
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86 the matching conditions depend on whether the boundary is a "step up or a step down With the incident wave specified a set of equations with 2N 5 Ne(M + l) unknown coefficients is formed. The solution starts with the definition of an incident velocity potential defined by Eq. 417 The scattered velocity potential is defined at each boundary (R j ) and consists of a plane progressi v e wave and evanescent modes for (J = 1 N s + 1): Inside the pit the velocity potential is given by the form [ "" ] coshlk 1 (h J + z )j iwr 'P ins J (r 0 ,z ,t)= L,B J m cos(m0)J,,,(k/) ( ) e m=O cosh k j h j The velocity potentials in each region are determined in the following manner ; for j =1 N s: if j = l ; then 1 = + s i and 1 + 1 = r/J ; ,, s i + s 2 o f if 1 < j < N 5 ; then ,1. = ,1. + ,1. 5 and ,1. 1 = ,1. + ,1. 'r 1 'r ms J 'f/ J 'r 1+ 'rm s J+l 'f/ S J + l (428) (429)
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87 The resulting integral equations are of the form: for j = l N s : if (h j > h j+ i) at r = Rj the depth anomaly is a pit and the boundary is a step down" and the matching conditions are 0 0 f/R j z )cosh[k)h j + z )]d z = f + i (R j z )cosh[k)h j + z )]d z (430) 0 0 f /R j,z )cos[K j jh j + z )] d z = f j+ I (Rj ,z )cos[K j j\ + z )] d z (n = 1 NJ (431) o f j [ ( )~ o f j+ I [ ( )~ (R j,z )cosh k j+ I h j+ i + z ~dz= (R j,z )cosh k j+ i h j+ i + z ~d z (432) a x ax h i h J+ l (n = 1 NJ (433) if (h j < h j+ i) at r = R j the depth anomaly is a shoal and the boundary is a step up" and the matching conditions are 0 0 f/R j,z )cosh[k j+ 1 (h j+ i + z )]d z = j+ 1 (R j,z )cosh[k j+ i(h j+ i + z )]d z (434) h j+ l 1, j+ l 0 0 f/R j,z )cos[K j+ ijh j+ I + z )]d z = fj + 1 (R j z )cos[K j+i jh j+ I + z )]d z h j+ l h j+ I (n = 1 NJ (435) (436)
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88 (n = 1 NJ (437) At each boundary (R j ) the appropriate evanescent mode contributions from the adjacent boundaries (R j I R j + I ) must be taken into account. The resulting set of simultaneous equations is solved as a linear matrix equation with the values of M N e and N 5 large enough to ensure convergence of the solution. 4.3 Exact Shallow Water Solution Method: Formulation and Solution The exact shallow water solution method solves for the long wave transformation by an axisymmetric pit or shoal that reduces the governing equation to an equation with a known solution Therefore this method is only valid within the shallow water limit for certain bathymetries containing a region where the depth is a function of the radius that connects two uniform depth regions. The governing equation is developed with the continuity equation in cylindrical coordinates : (438) Integrating from h to 11 applying the Leibnitz rule the kinematic free surface and bottom boundary conditions and then multiplying by the depth to obtain the v olume flow, q, results in (439) The nonviscous equations of motion averaged over depth and linearized gi v e (440)
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89 8q 0 gh 877 =at r a0 (441) Inserting Eqs. 440 and 441 into Eq. 439 after taking the derivative with time of each gives The solution is assumed to be of the form 77(r,0,t) = F(r)cos(mB)e;a1 which, when inserted into Eq. 442 results in the governing equation: r 2 F"(r) + rF'(r) +~ dh(r) F'(r) + (r 2 k(r) 2 m 2 )F(r) = 0 h(r) dr The solution starts by specifying an incident wave form: (442) (443) (444) (445) which is the shallow water form of Eq. 417. The velocity potential of the scattered wave and the wave inside the uniform depth region of the depth anomaly are given by the forms ,{r 0 t )[t.;A. cos(m0)H, ,,, (k, r) }'' ., (r,0,t )[ts cos(m0)J .(k,r) } '' (446) (447) A definition sketch for the boundaries of the exact solution method is shown in Figure 44 As in the step method, matching conditions are used at the interface between different reg10ns.
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90 711 11(r,n)+ +l ~ z 11 ins t L.J 11s 11(r,n)_L__., Oi r ! h(r) ! Figure 44: Definition sketch for boundaries of exact shallow water solution method The matching conditions ensure continuity of the water surface, ri: (r = RJ, (J = 1 2) (448) and continuity of the gradient of the water surface ( equivalent to continuity of discharge) : 8 77 j = 877 j+ I a r j ar j 1 8 where 77=g at z=O (r = RJ, (J = 1 2) (449) In order for Eq. 47 to be solved exactly only specific bathymetries must be defined. Table 41 contains two bathymetries, one pit and one shoal which sol v e the governing equation exactly The resulting set of simultaneous equations is sol v ed as a linear matrix equation with the number of Bessel function modes included m large enough to ensure convergence of the solution.
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91 T bl 4 1 S 'fi a e : ;pec1 cations fi b h fi h 11 l h d or two at ymetnes or exact s a ow water so ution met o h(r) C r 1 r 2 Solution ~ ri(r n) s [m] [m] C i r a~m) [J(<; s) iY(<; s)] 4ff fc 10 10 5 (pit) T gC C*r 0.2 10 5 a(r m) [J( <;,s ) iY(<; s)] + 4m 2 4 ff ff,' (shoal) 3 3T gC
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CHAPTERS 2DIMENSIONAL MODEL RESULTS AND COMPARISONS 5 .1 Introduction The step method was used to study wave transformation by 2D trenches and shoals in arbitrary water depth with the Analytic 2D Step Model ("2D Step Model"). The focus of the study was trenches or shoals with sloped transitions, which for the step method was performed by approximating a slope as a series of steps of equal size. The focus of the 2D results as there is no variation in the longshore is the energy reflection caused by the trench or shoal versus a dimensionless wave parameter. For shallow water conditions the results of the step method were compared to the results of the slope method and the numerical method, which are longwave models. The step method is also compared with the numerical model FUNW A VE 1.0 (1D] (Kirby et al., 1998) with reasonable agreement for the cases presented. 5.2 Matching Condition Evaluation Solution of the governing equations for the step method requires that the matching conditions for the pressure and the horizontal velocity Eqs 38 and 39 be satisfied over the depth, z, at each boundary between regions. For a bathymetric anomaly of infinite length with abrupt transitions the matching conditions are applied at the boundaries between the uniform depth region upwave and downwave of the anomaly and the uniform depth region that is the anomaly 92
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93 The matching conditions at the upwave boundary (x = X 1 ) for the case of a trench with abrupt transitions are shown in Figures 51 and 52. The trench, indicated in the inset diagram in each figure has a width of 30 m with uniform depths outside and inside the trench of 2 m and 4 m respectively and a incident wave period of 12 s. F i gure 51 plots the magnitudes of the horizontal velocity and the velocity potential with depth for two locations slightly inside and outside of the trench for 16 evanescent modes. The velocity potential can be used for the continuity of pressure condition as they have equivalent forms with depth The magnitude of the horizontal velocity shows good agreement between the solutions inside and outside the trench with zero velocity inside the trench along the vertical transition in depth (z < 2 m); where zero velocity is required. The oscillations in the values with depth arise from the inclusion of the evanescent modes in the solutions with more evanescent modes resulting in more oscillations with depth. The di v ergence in the velocities at z = 2 m can be explained by Gibb's phenomena when a Fourier series is used to approximate the behavior near the boundary. The magnitude of the velocity potentials inside and outside the trench shows good agreement with no requirement for the velocity potential to be zero for z < 2 m. Plots of the phase with depth for the horizontal velocity and the velocit y potential are shown in Figure 52. For z > 2 good agreement is shown for the solutions inside and outside the trench for both horizontal velocity and the velocity potential. The results of Figures 51 and 52 indicate that the matching conditions in the 2D Step Model are met for this case and the Eqs 314 through 317 correctly characterize the problem of an infinite trench with abrupt transitions in depth.
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I C o ,;~~~ 0 5 1 1 5 (solid) Inside Trench (o) Outs i de Trench X = X 1 = 0 k 1 h 1 = 0 24 0 2 ~ t [ij 2 5 3 3 5 C g 3 (I) > dl 3 5 4 L_ _!:::====:!..._ _J 0 20 40 X Distance (m) 4~ ~~~0 0 05 0 1 0 15 0 2 Horizontal Ve l ocity Magn i tude (m/s) 94 I C 0 t [ij (solid) Ins i de Trench 0 5 (o) Outs i de Trench X = X 1 = 0 1 k 1 h 1 = 0 24 1 5 2 5 3 3 5 4 ~~0 4 0 42 0.44 0 46 Velocity Potential Magn itu de (m 2 /s) Figure 51: Matching conditions with depth for magnitude of the horizontal velocity and velocity potential for trench with abrupt transitions and 16 evanescent modes. o ~~~ (solid) Inside Trencl 0 5 (o) Outside Treni 1 X = X 1 = 0 k 1 h 1 = 0 24 1 5 Outside Depth I 2 ~\_ _______ (I) t \ [ij 2 5 3 3 5 4 2 l L I I I 0 2 Horizontal Veloc i ty Phase (rad) 4 C 0 t [ij 0 5 1 1 5 (solid) Ins i de Trench (o) Outs i de Trench X = X 1 = 0 k 1 h 1 = 0 24 2 5 2 3 t,[] 3 5 4 0 20 40 X Distance (m) 0 25 0 2 0 15 0 1 0 05 Velocity Potential Phase (rad) Figure 52: Matching conditions with depth for phase of the horizontal velocity and velocity potential for trench with abrupt transitions and 16 evanescent modes.
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95 5.3 Wave Transformation The wave transformation caused by a twodimensional (infinitely long) bathymetric anomaly is usually shown through reflection and transmission coefficients as they are straightforward to calculate and can be plotted versus the wavelength thereby presenting values for many incident wave conditions. The reflection and transmission coefficients are calculated using the reflected and transmitted wave heights along with the specified incident wave conditions and Eqs. 310 and 3.11. The reflected and transmitted wave heights for a single wave period can be shown in a plot of the relative amplitude along a transect taken across the anomaly. Figure 53 shows the relative amplitude for a transect taken across the anomaly with the incident wave traveling in the positive X direction. The trench bathymetry is shown in the inset diagram with 10 steps approximating a transition slope of 0.1. 1 2 1 15 1.1 1 05 Q) "O 1 :e 0.. E <0 95 Q) > 0 9 a; er 0 85 0 8 0 75 0 7 100 50 0 1 C B1 5
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96 Upwave of the trench a standing wave pattern comprised of the incident and reflected waves is observed; however, downwave of the trench only the transmitted wave is found. With the incident wave specified, the reflected and transmitted wave heights can be determined and the reflection coefficient (KR= 0 164) and transmission coefficient (Kr= 0.987) can be calculated. Inside the trench, indicated by the dotted line in the main plot, the waveform must adjust to the new depth and therefore wave properties causing the reflection from the trench. The wave transformation caused by a shoal of infinite length for an incident wave period of 16 s is shown in Figure 54 with the inset diagram indicating the shoal bathymetry (slope = 0.05). As in the previous figure the dashed line in the main figure indicates the extent of the shoal and the "adjustment" of the waveform is shown. For this case the reflection and transmission coefficients are 0.115 and 0.993, respectively. 1 2 .rr~~~ Q) :, 1 15 1 1 i 1 05 E <( Q) > 1 Q) a::: 0 95 0 9 T = 16 s KR=0 115 KT= 0 993 N = 10 steps 50 X Distance (m) 100 0 85 ''''L___J 100 50 0 50 100 150 X D i stance (m) Figure 54: Relative amplitude for crossshoal transect for k 1 h 1 = 0.22; shoal bathymetry included with slope = 0 05.
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97 5.3.1 Comparison of2D Step Model to Numerical Model FUNWAVE 1.0 To provide some verification for 2D Step Model, a comparison can be made to the numerical model FUNW AVE 1.0 [1D] (Kirby et al., 1998), which has shown good agreement with laboratory data (Kirby et al., 1998). FUNW AVE 1D is based on the fully nonlinear Boussinesq model of Wei et al. (1995). The relative amplitude along a crosstrench transect is shown in Figure 55 for the 2D Step Model and for FUNW A VE 1D with wave heights of 0.2, 0.1 and 0.05 m and a wave period of 12 s. The trench bathymetry is indicated in the inset diagram with 10 steps approximating a transition slope of 0.1 for the 2D Step Model. In FUNW A VE 1D a space step of 1 m was used with a time step of 0.1 s. For the FUNW A VE 1D results the relative amplitude was calculated using Re/Amp= H(x) whereH(x) = with cr equal to the HI standard deviation, 17(x,t) equal to the water surface time series, and H 1 equal to the incident wave height. To ensure that reflection from the end walls was not encountered the time steps used in the relative amplitude calculation were from 1500 to 2220 with a basin length of 900 m and 10001 total time steps. The relative amplitude values from the 2D Step Model agree with those of FUNW AVE 1D with better agreement as wave height in FUNW AVE 1D is reduced and the waves become more linear. For an incident wave height of 0.05 m the FUNW AVE 1D results and the 2D Step Model results nearly match at the crests and troughs of the standing wave in the up wave region and also in the downwave region. The maximwn Ursell parameter ( U, =~:'),which is a measure of the wave nonlinearity, in the domain occurs outside the trench and is 74.2 and 19.6 for incident wave heights of0.2
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98 and 0.05 m, respectively One measure of the wave nonlinearity is to ensure that second order Stokes wave expansion is valid with the limit U < 8 1r 2 3 1 15 1 1 1 05 Q) u :E 1 a. E Q) 0 95 Q) Cl:'. 0 9 0 85 0 8 350 360 FUNWAVE 1D T = 12 s dx= 1 m dt = 0 1 s (s ol id) Analytic Step Model (x) FUNWAVE 1D [H=0 2 m] (o) FUNWAVE 1D [H=0 1 m) (+) FUNWAVE 1 D [H=0 05 m) 410 4 30 X Distance (m) 370 380 390 400 410 420 430 440 450 X Distance (m) Figure 55 : Relative amplitude along crosstrench transect for Analytic Model and FUNW A VE 1D for k 1 h 1 = 0.24; trench bathymetry included with slope = 0.1. The relative amplitudes for an asymmetric shoal are shown in Figure 56 for the 2D Step Model and for FUNW AVE 1D with heights of 0.2, 0.1 and 0.05 m The shoal has 10 steps approximating an upwave transition slope of 0.2 and a downwave transition slope of 0.05, with the waves incident from left to right. As in the previous diagram a period of 12 s was used with a space step of 1 m and a time step of 0.1 sin FUNW AVE 1D with the relative amplitude calculations from time step 1500 to 2220 The relative amplitude values from the 2D Step Model and FUNW AVE 1D compare well with much better agreement in the values as the wave height in FUNW A VE 1D is reduced and the waves become more linear For an incident wave
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99 height of 0 05 m the FUNW AVE 1D results and the 2D Step Model results nearly match at the crests and troughs of the standing wave in the upwave region and also in the downwave region with FUNW AVE 1D indicating somewhat larger values over the shoal. The maximum Ursell parameter in the domain occurs over the shoal and is 327.5 and 85.4 for incident wave heights of 0.2 and 0.05 m, respectively. The maximum Ur value outside of the shoal is 72.8 and 20.1 for wave heights of 0.2 and 0.05 m respectively. These results of the last two figures indicate the twodimensional 2D Step Model can adequately represent a symmetric or asymmetric bathymetric anomaly. 1 25 ...~ ,,~~~ ~~ 1 2 1 15 1 1 Q) 1 05 Q_ E <( 1 Q) > ai 0 95 IY 0 9 C: ll 1 5 "' > (solid) Analytic Step Model FUNWAVE 1 D T= 12 s dx= 1 m dt = 0 1 s 0 85 0 8 (x) FUNWAVE 1D [H=0 2 m\11 2 (o) FUNWAVE 1D [H=0 1 m] '40 0 4 2 0 4 4 ' 0 I ( +) FUNWAVE 1D [H=0 05 m] X Distance (m ) O 7 ~6 '0 3 '70 38 '0 3 '90 4 ' 0 0 41 .L 0 _ 4 ....L 20 43 L 0 4 ...L 40 4 ' 5 0 _,1 460 X Distance (m) Figure 56: Relative amplitude along crossshoal transect for Analytic Model and FUNW A VE 1D for k1 h1 = 0.24; shoal bathymetry included with upwave slope of 0 2 and downwave slope of 0.05. 5.4 Energy Reflection 5 .4.1 Comparison to Previous Results A comparison to results from Kirby and Dalrymple (1983a) was made to verify the step method (Figures 57 and 58). In these figures the magnitudes (i e. the phases
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100 are not reported) of the reflection coefficient, K R, and magnitudes of the transmission coefficient K T, are plotted versus the dimensionless wave number k 1 h 1 using the step method for the case of a symmetric trench with abrupt transitions and normal wave incidence. Also plotted are the values (shown as *") of Kr and K 1 for three different k 1 h 1 values taken from Table 1 in Kirby and Dalrymple (1983a) with good agreement between the results. 0 5 0.45 (' ") Kirby and Da l rymple (1983) Tab l e 1 0.4 0 35 0 3 a: 0.25 0 2 0 15 0 1 0 05 o ~ ~ ~~ ~ ~~~''''''''" ''___j'' 0 0 1 0 2 0 3 0 4 0 5 0 6 0.7 0.8 0 9 1 1 1 1 2 1 3 1.4 1 5 k1h1 Figure 57: Comparison ofreflection coefficients from step method and Kirby and Dalrymple (1983a Table 1) for symmetric trench with abrupt transitions and normal wave incidence: h 3 = h 1 h i/ h 1 = 3 W/h 1 = 10. The results in the figure include 16 evanescent modes, an amount which was found by Kirby and Dalrymple (1983a) to provide adequate convergence for most values
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101 0 98 0 96 0 94 0 92 (*) Kirby and Dalrymple (1983) Table 1 0 9 0 88 '''=.,_____,__'____._'____._~~~~~~ 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 1 1 1 2 1 3 1 4 1.5 k1h1 Figure 58: Comparison of transmission coefficients from step method and Kirby and Dalrymple (1983a Table 1) for symmetric trench with abrupt transition and normal wave incidence: h 3 = h 1, h i/ h 1 = 3 W/h 1 = 10. A comparison to the results of Lee et al. (1981) was also carried out. Good agreement was found between the results of the step method and those from Lee et al. for several cases of a trench with abrupt transitions A direct comparison between the results of the step method and data from the one case in Lee et al. (1981) for a trench with gradual transitions was not made as the complete dimensions of the trench were not specified in the article and could not be obtained 5.4 2 Arbitrary Water Depth To study the effects of sloped transitions on the wave transformation a number of trench and shoal shapes were examined. For the first component of the analysis the crosssectional ar e a was kept constant for several different symmetric trench
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102 configurations. The objective was to investigate wave transformation for various slopes with a fixed crosssectional trench area in a twodimensional domain The first set of trench shapes has the same crosssectional area and depth with different bottom widths and transition slopes as shown in Figure 59. The transition slopes range from an extreme value of 5000 that represents an abrupt transition to a gradual transition with a slope of 0 1. In this figure of the bathymetry and those that follow, the still water level is at elevation = 0 m. The trench with the abrupt transitions contains one step while ten equally sized steps approximate the slopes in the other three trenches I C 1 5 ,,...,,~~~ .2 1...~, 2 5 ( 4 ) : .(3 ) L ,<2>l c 1 ) l I ... : I I , I I : 1i , I i J I I I I ; ,' ,4 I I ; ~ 1 I I I I I I ,r 1 1 0 3 : ~ ..... : > Q) w 3 5 4 , : .ir, I l .. ~ : I L I : I I I ,_ I I I I I , ;:7 I I ,, ' : I : ... ... ; I I j I I .J ' I I Trench (1) (2) (3) (4) Slope 5000 1 0 2 0 1 4 5 ~~~~'''' 0 10 20 30 40 50 X Distance (m) Figure 59 : Setup for symmetric trenches with same depth and different bottom w idths and transition slopes. The reflection and transmission coefficients versus the dimensionless wa v e number k 1 h 1 are shown in Figures 510 and 511 respectively for the trenches w ith the
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103 same depth An inset figure of the trench through the centerline is included in each figure with four different line types indicating the corresponding trench configurations. The reflection coefficients oscillate with decreasing peaks as k1h1 increases and with k1h1 values of complete transmission (KR= 0) Decreasing the transition slope is seen to reduce the reflection caused by the trench, especially at larger values ofk 1 h 1 As the slope is reduced, the location of the maximum value of KR is shifted to a smaller k 1 h 1 as the apparent width of the trench is increased with decreasing slope, even though the slope does not change the average width. The number of instances where complete transmission occurs is also seen to increase greatly as the slope is made more gradual. 0 35 :~~~ 0 3 0.25 0 2 0 15 0 1 0 05 0 5 1 5 ~~~~~1 2 1,, :, ,.,., .. ~ I2 s ... ... t '/ =: 1 :II : .. \ '"1 I . 10 20 X Distance (m) 1 1 5 Figure 510: Reflection coefficients versus k 1 h 1 for trenches with same depth and different bottom widths and transition slopes Only onehalf of the symmetric trench crosssection is shown with slopes of 5000 1 0 2 and 0.1. The plot of the transmission coefficients shows the same features as the reflection coefficients with the effect on the wave field reduced as the slope is decreased. For all
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104 four trench configurations and all values of k 1 h 1 conservation of energy requirements were satisfied. 0 99 0 98 ~0 9 7 0 9 6 0 95 2 ~ ~, ~ , L, ... .. C ,g 3 "' a; w 3 5 4 a,. t _ ... :. ~. '1 4 5 ~0 1 0 2 0 X D i stance (m) 0 94 '~~~0 0 5 1 5 Figure 511 : Transmission coefficients versus k 1 h 1 for trenches with same depth and different bottom widths and transition slopes. Only onehalf of the symmetric trench crosssection is shown with slopes of 5000 1 0.2 and 0 1. The results shown in Figures 510 and 511 are for 16 evanescent modes taken in the summation and trenches with 10 steps approximating the sloped transitions The influence of the number of evanescent modes taken in the summation on the reflection coefficient is shown in Figure 512 for the same depth trenches with slopes of 5000 1 and 0 1 at a specified value of k I h 1 The reflection coefficient is seen to converge to a near constant value with increasing number of evanescent modes A value of 16 modes is found to produce adequate results and was used for all the step method calculations
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105 0 195 'y_~ 0 19 Trench (1) : Slope= 5000 k 1 h 1 = 0 95 0 185 0 5 10 15 20 25 30 35 40 0 242 0 241 Trench (2) : Slope= 1 'y_~ 0 24 k 1 h 1 =0 7 0 239 0 238 0 5 10 15 20 25 30 35 40 0 282 0 2815 Trench (4) : S l ope= 0 1 'y_~ 0 281 k 1 h 1 =0 1 0 2805 0 28 0 5 10 15 20 25 30 35 40 Number of Evanescent Modes in Summation Figure 512: Reflection coefficient versus the number of evanescent modes used for trenches with same depth and transition slopes of 5000 1, and 0.1. The influence of the number of steps used in the slope approximation is shown in Figure 513 for the same depth trench configurations. The reflection coefficient is seen to converge to a steady value with increasing number of steps used for the trenches with slopes of 1 and 0 1; however, for the abrupt transition trench (slope= 5000) convergence with an increasing number of steps was not found. Convergence for the abrupt transition was found as the step number decreased to 1, which represents an almost vertical wall. This could be due to the small distance between points that results when dividing the nearly vertical wall into an increasing number of segments. For this reason the abrupt transition trenches were configured with 1 step, resulting in an almost vertical wall and for all other slopes 10 steps were used This convention was followed for all the step method calculations.
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106 0 27 0 26 Trench (1) : Slope= 5000 ~o::0 25 k 1 h 1 = 0 95 0 24 0 23 0 5 10 15 20 25 30 0 3 Trench (2) : S l ope = 1 ~o::0 295 k 1 h 1 =0 7 0.29 0 5 10 15 20 25 30 0 285 ~o:: 0 28 Trench (4) : S l ope 0 1 k 1 h 1 =0 1 0 275 0 5 10 15 20 25 30 Number of Steps Figure 513: Reflection coefficient versus the number of steps for trenches with same depth and transition slopes of 5000 1, and 0.1 A second way to maintain a constant crosssectional area is to fix the bottom width of the trench and allow the trench depth and transition slopes to vary. The reflection coefficients for four trenches developed in this manner with the same bottom width are shown in Figure 514. An inset figure is included to show the trench dimensions through the centerline with slopes of 5000, 1, 0.2 and 0.05 being used. For this case, as the slope decreases, the depth of the trench must also decrease to maintain the fixed value of the crosssectional area The maximum reflection coefficient is seen to decrease and shift towards a smaller value of k 1 h 1 as the slope decreases, due to the associated decrease in the depth of the trench Generally the depth of the trench determines the magnitude of KR and the trench width determines the location of the maximum value of KR
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107 0 5 ,.====i::...====:...=====.=====., 0 45 0.4 0 35 0 05 0 5 :[ 3 C: 15 4 111 > dl 5 10 0 10 2 X D i stance ( m ) 1 5 Figure 514: Reflection coefficients versus k 1 h 1 for trenches with same bottom width and different depths and transition slopes. Only onehalf of the symmetric trench cross section is shown with slopes of 5000 1 0 2 and 0.05. Maintaining the trench crosssectional area and top width fixed while allowing the transition slopes and depths to change, results in another series of trench configurations. The reflection coefficients for four trenches with the same crosssectional areas and top width are shown in Figure 515. The slopes of the transitions are 5000 5 2 and 1. The trench with the smallest slope is found to produce the largest value of K R due to the large depth associated with that slope ; however the abrupt transition results in the largest KR values after the first maximum. For this case decreasing the slope does not shift the locations of the maximum values of KR as much as in the same depth and same bottom width cases althou g h no slopes less than one were used as they do not satisfy the constraints of the domain These three cases have demonstrated that trenches with the
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108 same crosssectional area can have very different reflective properties depending on the trench configuration. 0.45 0.4 0 35 0 3 'YO! 0 25 0 2 0.15 0 1 0.05 2 3 ]:_4 C: 0 cg 5 a3 [jJ 6 7 1 ___ , ' I_ 10 15 2 X Distance (m) OL_ ________ _L____!.L.:_~ _____ ...I...:..[.:...._ ___ __,""' 0 0 5 1 5 Figure 515: Reflection coefficients versus k 1 h 1 for trenches with same top width and different depths and transition slopes. Only onehalf of the symmetric trench cross section is shown with slopes of 5000, 5, 2, and 1. The effect of the transition slope can be viewed in another manner when the crosssectional area of the trench is not fixed. For a fixed depth and bottom width, decreasing the transition slope results in a trench with a larger crosssectional area Plots of the reflection coefficients versus k 1 h 1 for four trenches with the same depth and bottom width, but slopes of 5000, 0.2, 0.1 and 0.05 are shown in Figure 516. Decreasing the transition slope is seen to reduce KR, even though the trench crosssectional area may be much larger.
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109 0 3 ~r= 2 :: 5 =~~'____~_____~,' 0 25 ~"'0 15 0 05 3 ~,, '1 L I 35 !..I .. ll . I ~, (~ C ,g 4 (ll i 4 5 [jJ 5 ~... ... i: ., I :.. , L \ r : 20 0 X D i stance ( m ) 20 Figure 516: Reflection coefficients versus k 1 h 1 for trenches with same depth and bottom width and different transition slopes. Only onehalf of the symmetric trench crosssection is shown with slopes of 5000, 0.2 0.1 and 0.05. The step method is also valid for the case of a submerged shoal with sloped transitions approximated by a series of steps. Figure 517 shows the reflection coefficients versus k 1 h 1 for four different shoal configurations with transition slopes of 5000 0.5 0.2 and 0.05. Decreasing the transition slope is found to reduce the value of KR as was the case for the trench ; however, the reduction in KR is not as significant for large k1h1 as in the trench cases. A planar transition slope approximated by a series of uniform steps was used in the previous cases for the wave transformation caused by symmetric trenches and shoals. In the following cases the wave transformation by depth anomalies with variable transition slopes is investigated The domain was created by inserting a Gaussian form for the bottom depth into an otherwise uniform depth region
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110 0 25 ~~~===..=..:...=====..=======..==::..,, 0 2 0 15 0 1 0 05 2 I C .g 2 5 \ .. ' _, / j Ill ai w 1 1 l _3 .__~~ i / .=. , 1 5 Figure 517: Reflection coefficients versus k 1 h 1 for shoals with same depth and different top widths and transition slopes. Only onehalf of the symmetric shoal crosssection is shown with slopes of 5000, 0.5, 0.2 and 0.05. The equation for the Gaussian shape centered at x 0 was (x x 0 ) 2 h(x)=h 0 +C 1 e ~ (51) where ho is the water depth in the uniform depth region and C 1 and C 2 are shape parameters with dimensions of length. To implement the step method, steps were placed at a fixed value for the change in depth to approximate the Gaussian shape. Two extra steps were placed near h 0 where the slope is very gradual and one extra step was placed near the peak of the "bump" to better simulate the Gaussian form in these regions. The reflection coefficients versus k 1 h 1 for a Gaussian trench with C 1 and C 2 equal to 2 m and 12 m, respectively and a uniform water depth, h 0 equal to 2 mis shown in Figure 518. An inset figure is included to show the configuration of the stepped trench and the
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111 form of the Gaussian trench. The Gaussian form is approximated by the step method with a step at every 0 05 m change in depth The reflection caused by the Gaussian trench is seen to differ considerably from that for the trenches with constant transition slopes shown previously where KR showed significant oscillations that diminished as k 1 h 1 increased, even with gradual transition slopes. The reflection coefficient for the Gaussian trench is seen to have one peak near k 1 h 1 equal to 0.1 with minimal reflection for larger 0 25 2 2 2 2 4 0 2 2 6 :[ 2 8 C: 0 3 0 15 > 3 2 "' lJ.J :.:: 3 4 0 1 30 20 10 0 0 05 X Distance (m) 0 5 1 5 Figure 518: Reflection coefficients versus k 1 h 1 for Gaussian trench with C 1 = 2 m and C 2 = 12 m and h o = 2 m. Only onehalf of the symmetric trench crosssection is shown with 43 steps approximating the nonplanar slope. The reflection caused by a Gaussian shoal is shown in Figure 519 for C 1 and C 2 values of 1 m and 8 m respectively The steps approximating the Gaussian form are placed at 0.05 m depth intervals. As for the case of the Gaussian trench, a single peak in KR occurs followed by minimal reflection at larger values of k 1 h 1
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112 0 28 ~1 :::...==:=_==,..====:.,:=.=====...=~==:.,:=.=====...==:.., ;, ;, , 0 24 0 2 0 16 0 12 0.08 0 04 1 1 1 2 1.3 I1.4 C E 1 5 Ill > ~1 6 1 7 X Distance (m) 0 L~""""'""""'=....=~=..1 0 0 5 1 5 Figure 519: Reflection coefficients versus k 1 h 1 for Gaussian shoal with C1 = 1 m and C2 = 8 m and ho= 2 m. Only onehalf of the symmetric shoal crosssection is shown with 23 steps approximating the nonplanar slope. The trenches considered previously have been symmetric with the upwave and downwave water depths equal and the same slope for the upwave and downwave transitions. Figure 520 shows the reflection coefficients versus k 1 h 1 for 3 trenches with the same depth upwave and downwave of the trench: a symmetric trench with an abrupt transition, an asymmetric trench with a steep (s 1 = 1) upwave transition and gradual (s 2 = 0.1) transition and a mirror image of the asymmetric trench with a gradual (s 1 = 0.1) upwave transition and steep (s 2 = 1) downwave transition. The trench configurations are shown in the inset diagram with dashed and dotted lines. The order of the transition slopes (steep slope first versus gradual slope first) is seen to have no effect on the value of KR; therefore only one dotted line is plotted in the KR versus k 1 h 1 plot. Stated differently, the direction of the incident wave (positive x direction versus negative x
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113 direction) does not matter for this case. Kreisel (1949) proved this analytically for the case of a trench or shoal, either symmetric or asymmetric, in arbitrary water depth. For the asymmetric trenches with the different transition slopes, complete transmission only occurs at k 1 h 1 = 0 which is different from the case for the abrupt transitions and the previous cases where s 1 equals S z o 35 ~._ 1 ,..., 5 =~~'~~~~~,1 2 0 3 I2 5 C 2 3 ro 0 25 ~ 3 5 w 4 0 2 0 15 I \ I'\ I \ I \ I \ I \ I \ I \ I \ I \ : \,., I .. 0 1 _, 0 05 ....,.. Wave \ \ I I I I I I \ \ ,_ .J I ' _, I I . _, .! 20 30 40 50 X Distance (m) 0 L~~~ 0 0 5 1 5 Figure 520: Reflection coefficients versus k 1 h 1 for a symmetric abrupt transition trench, an asymmetric trench with s 1 = 1 and s 2 = 0.1 and a mirror image of the asymmetric trench. Asymmetric trenches can also be studied with different depths upwave and downwave of the trench. Figure 521 plots KR versus k 1 h 1 for domains with different depths upwave (h 1 ) and downwave (h 1 ) of the trench. The case of an abrupt transition (solid line) with the downwave depth greater than the upwave depth can be compared to the case with transition slopes of 0.2 ( dashed line) with the same crosssectional area. Complete transmission does not occur for either the trench with the abrupt transition or
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114 the trench with sloped transitions. The trench with sloped transitions is found to cause less reflection with an irregular oscillation in KR with increasing k 1 h 1 as compared to the abrupt transition. 0 3 1 5 . wave 2 I, I2 5 .. 0 25 .. C I 0 3 I > ~ 3 5 ., w 0 2 , 4 10 20 30 40 50 6 0 ::.:::a:0 15 X Distance ( m ) 0 1 0 05 0 'L~~ 0 Q5 1 5 Figure 521: Reflection coefficients versus k 1 h 1 for an asymmetric abrupt transition trench (h 1 ,t; h 5 ) an asymmetric trench with gradual depth transitions (h1 h s and s 1 = s 2 = 0 2) and a mirror image of the asymmetric trench with s 1 = s2 For this asymmetric case KR does not approach zero as k 1 h 1 approaches z ero as was found when h 1 was equal to h 1 but approaches the long wave value for a single abrupt step (either up or down) of elevation l h 1 h J!. Also plotted (dotted line) are the results for an asymmetric trench with the depth upwave of the trench greater than the depth downwave of the trench with transition slopes of 0 2 which is a mirror image of the trench shown with the dashed line The reflection coefficients for this case are identical in magnitude to (but differ in phase from) the mirror image trench if KR is plotted versus the shallower constant depth k 1 h 1 ; therefore only one dashed line for KR is
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115 plotted. This result is another case of the incident wave direction not affecting the magnitude of the reflection coefficients for an asymmetric trench as shown in Figure 520. Another asymmetric trench case is shown in Figure 522 where the upwave and downwave depths and transition slopes are different with a larger upwave depth and slope. In this figure two asymmetric trenches with the same crosssectional area are compared: a trench with an abrupt transition (solid line) and a trench with an upwave transition slope (s 1 ) equal to 1 and a downwave slope (s 2 ) of 0.2 (dashed line) The sloped transitions are seen to reduce significantly the value of KR, especially as k 1 h 1 mcreases 0 4 ,,;====i=====:::;:::====:::;:::==:;i 0 35 0 3 0 25 ,, ' 2 +Wave E ~3 0 ijj 4 w 5 I ,j' .. 20 40 60 X Distance (m) y_rr. 0.2 I I 0 15 0 1 0.05 I I ' I I I I I I I l l I I I I I I I I I \ \ \ I \ \ ,_, .. I I l I I I l I I I \ I I I ,, \ .. , \ \ \ .. \ o ~''____, 0 0 5 1 5 Figure 522: Reflection coefficients versus k 1 h 1 for an asymmetric abrupt transition trench (h1 :t:hs) an asymmetric trench with gradual depth transitions (h 1 :t:h 5 and s 1 = 1 and s2 = 0.2) and a mirror image of the asymmetric trench with s 1 :t:s 2
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116 As shown in the previous figure, KR does not approach zero as k 1 h 1 approaches zero for this case where the upwave and downwave depths are not equal. Also plotted is a mirror image of the asymmetric trench with the sloped transitions (dotted line).Only one dashed line for K R is plotted as the reflection coefficients for this case are identical to that for the mirror image trench if KR is plotted versus the deeper constant depth k s hs. This result is another example of the independence of KR to the incident wave direct i on as shown in Figures 520 and 521 and proven by Kreisel (1949). 5.4 3 Long Waves Direct comparison of the step method to the slope and numerical methods can only be made in the long wave region While the slope method and numerical method are limited by the long wave restrictions, it is in this region that changes in bathymetry are most effective at modifying the wave field The slope method does not contain any variables that will affect the accuracy of the results such as the number of evanescent modes or the number of steps as in the last section The numerical method however, is sensitive to the spacing between points used in the backward space stepping procedure described in Section 4 Figure 523 shows the value of KR versus the step spacing dx using the numerical method for three trench configurations at a single value ofk 1 h 1 for the three of the same depth cases (Figure 59) presented earlier. The reflection coefficient is seen to converge for dx < 1 m and a v alue of dx = 0 5 m was found to be adequate for the numerical model. To compare the three solution methods the same depth trench configurations shown in Figure 59 were used. In order to maintain long wave conditions throughout the domain the limit of k 3 h 3 n / 10 was taken with the subscript 3 indicating the constant
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117 depth region inside the trench between the transitions. Figure 524 shows K R v ersus k 3 h 3 for the three solution methods for the same depth trench case with a slope of 5000 The slope method and the numerical method are found to yield nearly the same value of KR at each point with the peak value occurring at a slightly smaller k 3 h 3 than for the step method. Overall the agreement between the three models is found to be very g ood for this case. 0 36 1 5 2 0 355 I 2 5 I I C , ,. 0 3 0 35 : I_ I ~ 3 5 w 1I 0 345 4 4 5 0 34 0 10 20 er: 0 335 0 0 33 0 325 0 32 }i~, .. ... ,<, .,( ...... . 0 315 ''''''''''' 0 1 2 3 4 5 6 7 8 9 10 d x (m) Figure 523: Reflection coefficient versus the space step dx, for trenches with same depth and different bottom width and transition slopes Only onehalf of the symmetric trench crosssection is shown with slopes of 5000 1 and 0 1. Figures 525 and 526 show KR versus k 3 h 3 for a slope of 1 and 0.1 respectively for the same depth trench case with all three models results plotted Good agreement is found for the results of the three models. In Figure 526 the numerical model results match those of th e slope method up to the peak value for K R, but as k 3 h 3 increases beyond
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118 the peak the numerical results match those of the step method and the slope method results diverge slightly. The similarity in the results of Figures 524 through 526 provides reasonable verification for the three solution methods in the shallow water region. 0 35 ~~...., 0 3 0 25 0 2 0 15 0 1 0.05 I I (solid)= step method (dash) = slope method (o) = numerical method 1 5 ~~~~ 2. E_2_5 C ,g 3 (ll > dJ3 5 4 4 5 L~~~~ 0 10 20 X Distance ( m ) 0 L''''~~ 0 0 05 0 1 0 15 0 2 0 25 0 3 k3h3 Figure 524: Reflection coefficients versus k 3 h 3 for three solution methods for the same depth trench case with transition slope equal to 5000. Only onehalf of the symmetric trench crosssection is shown. While the conservation of energy requirement is satisfied exactly in the step method and the slope method, for the cases studied, the numerical method is found to have some variance in the conservation of energy requirement for the space step used in Figures 524 through 526 Figure 527 shows the conservation of energy parameter versus the dimensionless wave number inside the pit, k 3 h 3 ,for the same depth trench with a slope of 1.
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119 0 3 5 ,~,,,,,,, 0 3 0 25 0 2 0 15 0 1 I I 0 0 0 05 0 1 1 5 2 .s2 5 C ,g 3 "' > ~ 3 5 4 4 5 0 15 k3h3 ( sol i d ) = step method ( dash ) = slope method ( o ) = numerica l method I 0 10 20 X D i stance ( m ) 0 2 0 2 5 0 3 Figure 525 : Reflection coefficients versus k 3 h 3 for three solution methods for same depth trench case with transition slope equal to 1 Only onehalf of the symmetric trench cross section is shown 0 2 5 0 2 :.::"' 0 1 5 0 1 0 05 I I I (solid) = step method ( dash) = slope method ( o) = numer i ca l method '~ ' 1 5 ,, 2 [ 2 5 2 3 Cll > &l 3 5 4 4 5 ~~~ 0 10 2 0 X Distance ( m ) \ \ \ \ \ ' \ ' \ \ o ~~ ~~ ~~ 0 0 0 5 0 1 0 2 0 25 0 3 Figure 526 : Reflection coefficients versus k 3 h 3 for three solution methods for same depth trench case with transition slope equal to 0 1. Only onehalf of the symmetric trench crosssection is shown
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120 1 0001 ~~,,..,,, 1 >Q) tfj 0 9999 1 .5 0 2 C I 2.5 0 C C: 0 3 Q) VJ C > 8 0 9998 .,g/ 3 5 w 4 4 5 I 1 0 10 X D i stance (m) 20 (solid) = step method ( x ) = slope method (o) = numerical method 0 9997 ~~~~~~~ 0 0 05 0 1 0 15 0 2 0 25 0 3 k3h3 Figure 527: Conservation of energy parameter versus k 3 h 3 for three solution methods for same depth trench case with transition slope equal to 1. Only onehalf of the symmetric trench crosssection is shown. As noted the step method and the slope method have values exactly equal to 1 while the numerical method results are equal to one for small k 3 h 3 with increasing deviation from one, although very small, as k 3 h 3 increases. Using the step method the reflection coefficients for Gaussian trenches and shoals were shown to ha v e a single peak followed by minimal reflection as k 1 h 1 increased Figure 528 shows a comparison of the step method and numerical method results for a shoal with ho= 2 m, C 1 = 1 m, and C 2 = 8 m. The results for the step method were shown previously in Figure 519. The slope method can only contain two slopes and therefore cannot be emplo y ed to model a Gaussian form and is not included in the following
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121 compansons. The numerical results show good agreement with those of the step method with a slight divergence at higher k 1 h 1 values near the shallow water limit. 0 28 ~~,., ,, 0 24 0 2 0 16 0 12 0 08 0 04 X Distance (m) (sol i d) step method, dh = 0 1 m (o) numerical method dx = 0 5 m 0 0 0 0 0 0 0 0 0 0 0 0 0 o ~~~~ ~0 0 05 0 1 0 15 0 2 0 25 0 3 k1h1 Figure 528: Reflection coefficients versus k 1 h 1 for step and numerical methods for Gaussian shoal (h 0 = 2 m, C 1 = l m, C 2 = 8 m). Only onehalf of the symmetric shoal crosssection is shown with 23 steps approximating the nonplanar slope. Figure 529 is a comparison of the results of the step method and the numerical method for a Gaussian trench in shallow water. The step method has a step for every 0.01 m in elevation and the numerical method has a space step of 0.1 m. The domain is in very shallow water (ho = 0 25 m, C 1 = 0.2 m, C 2 = 3 m) to extend the numerical method results into the region of minimal reflection following the initial peak in KR. The numerical method results agree closely to those of the step method and verify the small KR values of the step method that occur as k 3 h 3 increases after the initial peak in KR.
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122 The case of a trench with unequal upwave and downwave slopes as shown in Figure 520 is no w compared for the three solution methods In order to maintain shallow water conditions throughout the domain a limit ofk 3 h 3 ::::; 1t / lO was set for the slope and numerical methods. Figure 530 shows the value of KR versus k 3 h 3 for the same depth trench with an abrupt transition (solid line) and for s 1 and s 2 equal to 1 and 0 1 respectively The bottom width for all three cases was maintained the same. The slope and numerical method results show good agreement with the step method solution for both cases. Due to the location of the shallow water limit the increase of KR for the step method at k 3 h 3 equal to 0.4 cannot be verified directly 0 25 0 25 0.3 0 2 I C ,8 0 35 <1l > Q) [jj 0 15 0.4 a,: ::.::'. 0.45 10 0 1 0 05 8 6 4 2 X Distance (m ) (sol i d) step method (o) numer i cal method 0 Figure 529: Reflection coefficients versus k 3 h 3 for step and numerical methods for Gaussian trench in shallow water (ho = 0.25 m C 1 = 0.2 m, C 2 = 3 m). Only onehalf of the symmetric trench crosssection is shown with 23 steps approximating the non planar slope.
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123 The case of an asymmetric trench with unequal upwave and downwave slopes and depths as shown in Figure 522 is now compared for the three solution methods. For the slope and numerical methods a limit ofk 3 h 3 n / 10 was taken to maintain shallow water conditions. 0 35 ,,,,,,= === = == = 0 3 0 25 0 2 0 15 0 1 0 1 (solid) step method abrupt transition ( ) step method s 1 not equal to s 2 (+) numer i cal method (o) slope method 0 2 0 3 2 0 5 .wave 20 30 40 50 X D i stance (m) .. __ ,,,,,,, ,,' 0 6 0 7 .. ,,,"" 0 8 Figure 530: Reflection coefficients versus k 3 h 3 for three solution methods for same depth trench case with symmetric abrupt transition trench and asymmetric trench with unequal transition slopes equal to 1 and 0 1 Figure 531 shows the value of KR versus k 3 h 3 for an asymmetric trench with an abrupt transition (solid line) and s 1 and s 2 equal to 1 and 0.2, respectively (dash line ) The bottom width was changed to maintain a constant crosssectional area. The slope and numerical method results show good agreement with the step method solution for both cases with less divergence in the KR values at larger k 3 h 3 for the sloped transition trench
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0 35 0 3 0 25 0 2 "' 0 15 0 1 C 24 ., > 0 05 &l5 0 0 I I I I I 0 0 1 I I I I 20 40 X D i stance (m) 0 2 124 ,, ............. , ' \ \ \ \ \ \ \ \ \ \ \ // \ \\ \ ,/ (solid) step method abrupt trans ition \ v () step method s 1 not equal to s 2 (+) numerical method (o) slope method 60 0.4 0 5 0 6 Figure 531: Reflection coefficients versus k 3 h 3 for three solution methods for same depth trench case with asymmetric abrupt transition trench and asymmetric trench with unequal transition slopes equal to 1 and 0 2
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CHAPTER6 3DIMENSIONAL MODEL RESULTS AND COMPARISONS 6.1 Introduction Solution of the threedimensional models establishes the complex velocity potential anywhere in the fluid domain. From the complex velocity potential the wave height, wave angle and energy flux can be determined and used to show the wave field modification and energy reflection caused by a bathymetric anomaly Using the Analytic 3D Step Model ( 3D Step Model") the effect of the depth transition slope on the wave field modification was investigated. The wave field modification is indicated by changes in the wave height and wave direction. The effect of the transition slope on the energy reflected by a 3D bathymetric anomaly is approximated using a farfield method developed in the study. To extend the 3D Step Model to the nearshore region where the depth is non uniform an analytic shoaling and refraction method was developed to determine the breaking wave height and angle for arbitrary nearshore slopes Estimates of the longshore transport and shoreline change are made by combining the 3D Step Model, the analytic shoaling and refraction model and the shoreline change model. The shoreline change model uses the conservation of sand ( continuity) equation with the breaking wave height and angle from the nearshore model driving the longshore transport. Comparisons between the 3D Step Model and the exact analytic model were made in shallow water conditions for two bathymetries. The 3D Step Model is also 125
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126 validated through comparison with the laboratory data of Chawla and Kirby (1996) the numerical models REF/DIF1 (Kirby and Dalrymple 1994) and FUNWAVE 1.0 [2D] (Kirby et al. 1998) and the numerical model of Kennedy et al. (2000) for arbitrary depth conditions 6.2 Matching Condition Evaluation Solution o f the governing equations for the step method requires the matching conditions for the pressure and the horizontal velocity Eqs. 414 and 415, to be satisfied over the depth z at each boundary between regions. For a bathymetric anomaly with abrupt transitions the matching conditions are applied at the boundary between the uniform depth region outside the anomaly and the uniform depth region that is the anomaly. The matching conditions for the case of a pit with abrupt transitions are shown in Figures 61 and 6 2 The pit has a radius of 20 m with uniform depths outside and inside the pit of 2 m and 4 m respectively and an incident wave period of 12 s. Figure 61 plots the magnitude of the horizontal velocity and the velocity potential with depth for two locations slightly inside and outside of the pit for 10 evanescent modes. The velocity potential can be used for the continuity of pressure condition as they have equi v alent forms with depth. The magnitude of the horizontal velocity shows good agreement between the solutions inside and outside the pit. The requirement of zero velocity inside the pit along the v ertical transition in depth (z < 2 m) is met to good approximation The oscillations in th e values with depth arise from the inclusion of the evanescent modes with the divergence in the velocities at z = 2 m explained by Gibb s phenomena The magnitude of the v elocity potentials inside and outside the pit shows reasonable agreement with no requirement for the velocity potential to be zero for z < 2 m
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0 0 5 (solid) Inside Pit (o) Outside Pit 1 r = R = 20 m 0 = 0 deg 1 5 5 C oa 0 2 =%/ > Q) iii Outs i de 2 5 Depth 3 3 5 4 0 2 4 6 Hor i zontal Velocity Magn i tude (m/s) 127 E C 0 :.;::; ro > Q) iii 0 0 5 1 1 5 2 2 5 3 3 5 4 (solid) Inside Pit (o) Outs i de Pit r = R = 20 m 0 = Q deg 13 6 13.8 14 14 2 Velocity Potential Magn i tude (m 2 /s) Figure 61: Matching conditions with depth for magnitude of the horizontal velocity and velocity potential for pit with abrupt transitions and 10 evanescent modes. Figure 62 plots the phase with depth for the horizontal velocity and the velocity potential with good agreement for z > 2 The results of Figures 61 and 62 indicate that the matching conditions in the 3 D Step Model are met for this case and Eqs. 420 through 423 correctly characterize the problem of a bathymetric anomaly in the form of a pit with abrupt transitions in depth. 6 3 Wave Height Modification Using the 3D Step Model, a wave field that encounters a bathymetric anomaly will be modified by the three wave transformation processes identified earlier. In a three dimensional domain the modified wave field can be viewed as a contour plot of the relative amplitude for the wave envelope where the modified wave field is normalized by
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128 the incident wave height. Figure 63 shows a contour plot of the relative amplitude for a circular pit with sloped sidewalls (truncated cone) In this figure and all that follow the incident waves propagate from left to right. A cross section of the pit taken through the centerline is shown in the inset diagram for onehalf of the pit and a transition slope of 0.1 where 10 equally sized steps approximate the slope. The divergence of the wave field caused by the pit is shown clearly in Figure 63 with a large area of wave sheltering evident directly shoreward of the pit. This area is flanked by two bands ofrelative amplitude greater than one caused as the waves converge or focus at these locations The relative amplitude values are found to be symmetric about Y = 0. 0 ~ 0 5 1 (solid) Inside Pit ( o) Outs i de Pit r=R=20m 0 = Odeg 1 5 Outside Depth \ 2 2 111 > (I) [iJ 2 5 3 3 5 1 0 Horizontal Velocity Phase (rad) 2 I C 0 > (I) w 0 0 5 (solid) Inside Pit (o) Outside Pit 1 r = R = 20 m 0 = Odeg 1 5 2 2 5 3 3 5 4 0.55 0 5 0.45 0.4 0 35 Velocity Potential Phase (rad) Figure 62: Matching conditions with depth for phase of the horizontal velocity and velocity potential for pit with abrupt transitions and 10 evanescent modes.
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200 150 /> 100 I 50 C 0 n 0 0 >50 100 150 200 100 0 100 129 200 300 400 500 X Direction (m) 1 2 1 1 Q) 0 1 :E a. E 0 9
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130 1 1 ,,,..~, 0 9 Q) "O .E C. E <0 8 Q) i "' Qj 0:: 0 7 0 6 2 I 2 5 C g 3 "' a'; w 3 5 30 20 10 0 R value [m] 0 5L...'''''' 100 0 100 200 300 400 500 X Distance (m) Figure 64: Relative amplitude for crossshore transect at Y = 0 with k1h1 = 0.24 for pit with transition slope= 0.1; crosssection of pit bathymetry through centerline included. Note small reflection. 1 3 ,~~~,~~ Q) "O ::, 1 2 1 1 i1 E < Q) i 0 9 Qj 0:: 0 8 0 7 20 0 R value [m] 0 6 ~~ ~~~ ~~~~ 200 150 100 50 0 50 100 150 200 Y D i stance (m) Figure 65: Relative amplitude for longshore transect at X = 300 m with k 1 h 1 = 0.24 for pit with transition slope = 0.1; crosssection of pit bathymetry through centerline included.
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131 The longshore transect (Figure 65) shows sheltering directly shoreward of the pit and oscillations in the relative amplitude that decay with distance in the longshore direction. The oscillations in the longshore direction indicate the refraction and diffraction of the wave field created by the bathyrnetric anomaly. In the previous plots of the relative amplitude the number of evanescent modes and Bessel function modes were 4 and 120, respectively, with these values providing reasonable convergence of the solution In the 3 D Step Model the convergence of the solution depends on three parameters: the number of evanescent modes included the number of Bessel function modes included and the number of steps approximating the transition in depth. The convergence of the solution with respect to the number of Bessel functions modes included was found to depend on the distance from the center of the bathyrnetric anomaly and its radius ; a dependency that was not found for the number of evanescent modes and the number of steps. The influence of the number of evanescent CN e ) and Bessel function (Mval) modes on the solution is shown in Figure 66 for case of a circular pit with a radius of 20 m and abrupt transitions in depth. Abrupt transitions were used to remove the influence of the number of steps approximating the transition slope. The uniform water depth outside the pit h is 2 m and the uniform depth in the center of the pit, d is 4 mas before. To illustrate the dependence of the solution on distance from the center of the pit two plots are shown; one for a point located 100 m shoreward of the pit center and one for a point located 800 m shoreward. The plots indicate convergence of the relative amplitude value with increasing number of evanescent modes and increasing number of Bessel function modes For both locations using 4 evanescent modes was found to
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132 provide adequate convergence. The point located at X = 100 m was found to require between 30 and 50 Bessel function modes for convergence of the solution while the point located at X = 800 m required between 120 and 140 modes. This indicates that for convergence of the solution the number of Bessel function terms must be increased as distance from the bathymetric anomaly increases. Circular Pit r = 20 m h = 2 m d = 4 m k 1 h 1 = 0 24 Q) 0 579 "O :e 0 578 a. E 0 577 ( 0 576 0 575 Cl:'. 0 574 X ~X X Xp = 100 m Yp= 0 0 573 '''~~~1 2 3 4 5 6 Bessel Functions Modes (x) Mval = 15 (+) Mval = 30 (o) Mval = 50 7 8 9 10 0 83 ~~~ Q) 0 8295 a. E 0 829 Q) > cii 0 8285 Cl:'. X X Xp = 800 m Yp = 0 0 828 '''~~1 2 3 4 5 6 Bessel Funct i ons Mode (x) Mval = 110 (+) Mval = 120 (o) Mval = 140 7 8 9 10 Number of Evanescent Modes (N 9 ) Taken in Summation Figure 66: Relative amplitude versus number of evanescent modes included for different Bessel function summations at two locations directly shoreward of a pit with abrupt transitions in depth. The influence of the number of steps, N s approximating a linear, gradual transition in depth is shown in Figure 67. Two plots are included in the figure for circular pits with transitions slopes of 1 and 0.1, respectively. The uniform water depth outside the pit, h is 2 m, and the uniform depth in the center of the pit, d, is 4 m. The relative amplitudes are taken at a point located 400 m shoreward from the first step used
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133 to approximate the gradual transition in depth. For both pits the solution converges as the number of steps approximating the slope increases, with 10 steps providing adequate convergence. The number of Bessel function modes needed to ensure converge is between 60 and 90 for both pit configurations With these results the base conditions for the 3D Step Model were 4 evanescent modes, 10 steps approximating the linear depth transitions and 90 or 120 Bessel function modes depending on the distance from the anomaly Circular Pit h = 2 m, d = 4 m, Xp = Rt400 m Yp = 0 k 1 h 1 = 0.24 0 84 X X ~0 82 X X X X ::, X != a. 0 8 R 1 = 21 m Bessel Functions Modes E R 2 = 19 m (x) Mval = 30 <( 0 78 slope= 1 (+) Mval = 60 +J (o) Mval = 90 (1l ai 'flo:: 0 76 I 0 74 0 5 10 15 20 25 30 0 9 ~~~~~ Q) ]0 8 a. E X ai 0 6 0:: 8;) X X X X R 1 = 29 m R 2 = 9 m slope= 0 1 X X Bessel Functions Modes (x) Mval = 30 (+) Mval = 60 (o) Mval = 90 0 5'''L''_J_o 5 10 15 20 25 30 Number of Steps (NJ Figure 67: Relative amplitude versus number of steps approximating slope for different Bessel function summations for two pits with gradual transitions in depth. The wave field modification caused by a shoal can also be studied using the 3D Step Model. A contour plot of the relative amplitude for a domain containing a shoal in the form of a truncated cone with a transition slope equal to 0.1 is shown in Figure 68.
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134 The shoal causes an area of wave focusing, and a resulting increase in relative amplitude directly shoreward of the shoal. Two areas with relative amplitude less than one flank this area of increased relative amplitude. These results demonstrate the difference in the wave field modification caused by a shoal versus a pit (Figure 63) with shoals causing wave sheltering/focusing where a pit causes focusing/sheltering. 250 1 6 200 1 4 Q) 150 1 2 'g ~ 0.. 1 E 100 <( Q) 08 i I 50 .!!! Q) C 0 6 o::: 0 :;::; 0 0 0 4 0 >50 1 5 100 I C 2 0 150 :;::; Cll a, 2 5 [jJ 200 3 40 20 0 250 R value (m) 100 0 100 200 300 400 500 600 X Direction (m) Figure 68: Contour plot ofrelative amplitude for shoal with k 1 h 1 = 0.29 and transition slope= 0.1; crosssection of shoal bathymetry through centerline included. A focal point of the current study was to investigate the effect of the transition slope on wave field modification. In an attempt to isolate the effect of the sidewall slope, different truncated cones of constant volume were created. Starting from a pit of uniform depth with abrupt depth transitions (cylinder), three other pits (truncated cones) with the same volume and depth were created by allowing the transition slope to decrease. A
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135 crosssection of these same depth pits taken through the centerline is shown in Figure 69 where the slopes used were abrupt, 1 0.2 and 0.07. The main plot shows the relative amplitude along a crossshore transect through the center of each pit for k1h1 = 0.15 w ith the extent of the abrupt pit indicated by the dotted line Upwave of the pit a more gradual transition slope is seen to reduce the reflection caused by the pit. The sheltering downwave of the pit is seen to increase as the transition slope decreases. 1 2 ~~r,,r,, Q) ::, ~ 0.. 1 15 1 1 1 05 E 0 95 < Q) i 09 (1) Q) 0:: 0 85 0 8 0 75 0 7 150 I \ ; .. 100 r r ... i\_ i \ \ i 50 2.5 I C :8 3 (1) > Q) [iJ 3 5 4 : I ;,~ .. I I ; I .. I ; I \ :,~ t. I I I :": ._ i ''~~_, 30 20 10 0 R value (m) 0 50 100 X Position (m) 150 Figure 69: Relative amplitude for crossshore transect at Y = 0 for same depth pits for k1h 1 = 0 15; crosssection of pit bathymetries through centerline included with slopes of abrupt, 1 0 2 and 0.07. The wave field modification caused by an incident wave with k 1 h 1 = 0.3 i s shown in Figure 610 In this figure the greatest reflection upwave of the pit is associated with transition slopes of 1 and 0.2 with minimal reflection for a slope of 0.07. The effect of the slope on the reflection is different in Figure 610 than in Figure 69 indicating that the
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136 incident wave characteristics can significantly affect the wave field modification caused by the bathymetric anomaly. This result will be further discussed in Section 6 8. The sheltering caused by all four pit bathymetries is greater for k1h1 = 0.3 than for k1h1 = 0.15 with the most gradual slopes having the greatest sheltering effect. Q) "'O 0 9 ~ 0 8 ci. E <( 0 7 Q) O:'.'. 0 6 0 5 04 100 50 0 2 j I . =: ;., I I : I h 1 2 5 C ;. :8 3 (1l uJ 3 5 I ;': i _' : I .. .,L I :, \ \ I : 4 ........._ __ ~~ I I 30 20 10 0 R value (m) 50 100 150 X Position (m) Figure 610: Relative amplitude for crossshore transect at Y = 0 for same depth pits for k 1 h 1 = 0.3; crosssection of pit bathymetries through centerline included with slopes of abrupt, 1, 0.2 and 0.07. The effect of the transition slope on the wave field can also be viewed in the longshore direction Figure 611 shows the relative amplitude versus longshore distance for k 1 h 1 = 0.15 at X = 200 m. Only onehalf of the longshore transect is plotted as the results are symmetric about Y = 0. As indicated in Figure 69 as the transition slope becomes more gradual the sheltering directly shoreward of the pit increases indicating a greater divergence in the wave field near the pit. The focusing caused by the pit at Y =
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137 120 mis seen to increase as the transition slope decreases, which follows from the more gradual slopes causing a greater divergence in the wave field. 1 2 ~..,.,,,~, 1 15 1 1 ..., 1 05 C Q) 0 1 0 0 C 2 0 95 u Q) 0 9 0 85 0 8 .,, .,,,, C 2 3 ro ai [ij3 5 ,_ I 4.......__~~ 30 20 10 0 R value (m) k 1 h 1 = 0.15 Xp = 200 m 0 75 ''''~~~ 0 50 100 150 200 250 300 Y Distance (m) Figure 611: Relative amplitude for alongshore transect at X = 200 m for same depth pits for k 1 h 1 = 0.15; crosssection of pit bathymetries through centerline included with slopes of abrupt, 1, 0.2 and 0.07. The results from Figure 611 can be compared to those of Figure 612 which show the relative amplitude in the longshore direction for k 1 h 1 = 0 3 As shown previously, the more gradual transition slopes result in the greatest sheltering of the waves directly shoreward of the pit with Figure 612 indicating more wave sheltering and greater wave focusing than for the case of Figure 611. The effect of the transition slope for the case of a shoal can be viewed in Figures 613 and 614 in the crossshore and longshore direction, respectively. A crosssection of the shoal configurations taken through the centerlines is shown in each figure with each
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138 shoal in the form of a truncated cone with constant volume The slopes for the transitions are abrupt 1 0.2 and 0.05. Figure 613 shows the relative amplitude for a transect in the crossshore direction through the center of the shoal for k 1 h1 = 0 15 with the extent of the shoal indicated by the dashed line. The features of the contour plot of relative amplitude for a shoal (Figure 68) are shown with an increase in the relative amplitude over the shoal and shoreward of the shoal where wave focusing occurs The shoal with a transition slope of 0.05 is seen to cause less focusing shoreward of the shoal significantly smaller relative amplitudes over the shoal and a reflected wave that is out of phase but similar in magnitude to the other transitions slopes. 1 4 .r~~r~~ 1 3 1 2 1.1 Q) ] 1 a. E Qi 0 8 er 0 7 0 6 k 1 h 1 =0 3 Xp = 200 m :[2 5 C: 2 3 ro > Q) [jJ 3 5 1. \, I I , '; ~ l' 'I !., == 4 L_ ~ ::'.: ;t === :::: ~ :::::::f 30 20 10 R value ( m) 0 4 '''j__'__L_ _J 0 50 100 150 200 250 300 Y Distance (m) Figure 612: Relative amplitude for alongshore transect at X = 200 m for same depth pits for k 1 h 1 = 0.3 ; crosssection of pit bathymetries through centerline included with slopes of abrupt, 1 0.2 and 0.07.
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139 1 8 ~r~r.,,, 1 7 1.6 a, 1 5 E 0.. E 1.4 < Q) > 1 3 Q) Cl:'. 150 100 50 1 5 E 2 I' ,_; I : r ;r I : .. ; ~ I _, I /\\ \ \ , j 3~ \ . \ ., 40 30 20 _______ :, , , .. ... . R value (m) 0 50 100 150 X Distance (m) 10 200 Figure 613: Relative amplitude for crossshore transect located at Y = 0 for same depth shoals with k 1 h 1 = 0.15; crosssection of shoal bathymetries through centerline included with slopes abrupt 1 0.2 and 0.05. In Figure 614 the transition slope is shown to reduce the magnitude in the longshore oscillations of the relative amplitude in the regions of wave focusing. The longshore transect is located at a crossshore distance of 300 m and only onehalf of the longshore transect is plotted as the results are symmetric about Y = 0. Up to this point all of the transitions in depth have been linear. Nonlinear transitions in depth can also be studied using the step method and provide a more realistic representation ofbathymetric anomalies found in nature. In Figure 615 a transition slope with a Gaussian form connects two regions of uniform depth The equation of the (xx 0 ) 2 Gaussian form centered at x 0 was h( x ) = h 0 + C 1 e 2 where the shape factors C 1 and C 2 were taken as 1 m and 20 m respectively
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140 1.2 1 5 I I 1 15 I ,. ]: 2 I ,. 1 1 ~ ,,. ,f 1 05 ' _; I Q) ( 1 0 3 ::::, ~ ci.. 40 20 E R value (m) Q) io 95 (1l Q) k 1 h 1 = 0 15 0:: 0 9 Xp = 300 m 0.85 0 8 0.75 0 50 100 150 200 250 300 Y Distance (m) Figure 614: Relative amplitude for alongshore transect located at X = 300 m for same depth shoals with k 1 h 1 = 0 15; crosssection of shoal bathymetries through centerline included abrupt 1 0.2 and 0 05 The Gaussian slope connects the uniform depth region outside the pit to a uniform depth region ofradius equal to 20 mat the center of the pit. A crosssection of the pit bathymetry taken through the centerline is shown in an inset diagram with the parameters for the pit. For this example 23 steps approximate the nonlinear slope of the Gaussian transitions in depth. The main plot shows the relative amplitude for a crossshore transect through the center of the pit for k 1 h 1 = 0.24. The pit is shown to cause minimal reflection in the upwave direction with significant sheltering at the shoreward extent of the pit and shoreward of the pit.
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Q) "O 0 9 0 8 :e 0 7 a. E <( 0 6 ai a:: 0 5 0.4 0 3 141 2r, 2.2 E ~2.4 0 iii 2 6 jjj 2 8 3 c 1 = 1 m C 2 = 20 m rflat=20m N = 23 100 80 60 40 R value (m) X Distance (m) 20 0 Figure 615: Relative amplitude for crossshore transect at Y = 0 for pit with Gaussian transition slope for k 1 h 1 = 0.24; crosssection of pit bathymetry through centerline included. 6.3.1 Comparison of 3D Step Model and Analytic Shallow Water Exact Model For certain shallow water bathymetries the 3D Step Model can be compared to the exact shallow water analytic model (exact analytic model) described in Section 4.3. Table 41 indicates two bathymetric forms that satisfy the requirements of the exact analytic model. To specify a bathymetry for the exact analytic model the value of C, h 1 h2, R1, R2 and T (wave period) must be selected such that shallow water conditions are maintained Figure 616 shows the relative amplitude in the crossshore direction through the center of the pit for the 3D Step Model (N 5 = 10 steps) and the exact analytic model. The inset diagram shows a crosssection of the pit bathymetry through the centerline for the dimensions indicated in the figure, which satisfy the exact analytic model for the first case in Table 41 h = C / r. Good agreement between the models is indicated in all
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142 regions (upwave, over the pit and downwave) providing verification for the 3D Step Model in shallow water. A transect in the longshore direction comparing the two models for this bathymetry is shown in Figure 617. The transect is located at Xp = 100 m with good agreement between the models indicated in the longshore direction for this case 1 .2~~~rrr, Q) ""CJ :E a. 1 1 E ~0 9 Q) > Q) Cl'. 0 8 0 7 80 I C 21 5 ffl ai [Ij 2 ~~ 15 10 5 0 R value (m) 60 40 20 0 X Distance (m) (solid) Step Model [Ns = 10 (o) Exact Solution Model 20 h = C/r C = 10 R 1 = 10 m R2=5m r T = 12 s Yp= 0 40 60 Figure 616: Relative amplitude for crossshore transect at Y = 0 for pit with for h = C i r in region of transition slope; crosssection of pit bathymetry through centerline included. The 3D Step Model and the exact analytic model can also be compared for the case of a shoal with Case 2 in Table 1 Figures 618 and 619 show the relative amplitude in the crossshore and longshore directions for the case of a shoal that satisfies the requirements of the exact analytic model with h = C*r (linear slope) in the region connecting the two uniform depth regions. In each figure the inset diagram shows a crosssection of the shoal bathymetry through the centerline. In Figure 618 good agreement is shown between the models in the upwave region with the exact analytic model indicating slightly less focusing over the shoal and in the downwave region.
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143 1 15 , Q) u :E a. E Q) > ai a:: 1 1 1 05 0 95 0 9 1 C B1 5 (II ai w 2 '' 15 10 5 0 R value (m) 50 Y Distance (m) (solid) Step Model [Ns = 10) (o) Exact Solution Model 100 T= 12 s Xp=100m 150 Figure 617: Relative amplitude for longshore transect at X = 100 m for pit with for h = C i r in region of transition slope; crosssection of pit bathymetry through centerline included 1 35 1 ~ 1 2 E 1 3 ~14 0 1 25 1 6 Q) Q) 1 2 u ~ w _1 s f115 10 5 R value (m) 1 1 ai a:: 1 05 0 95 0 9 0 (solid) Step Model [Ns = 10] (o) Exact Solution Model h = C*r C= 0 2 R 1 = 10 m R 2 = 5 m 0 85 ''',.__'''_J 80 60 40 20 0 20 40 60 X Distance (m) Figure 618: Relative amplitude for crossshore transect at Y = 0 for shoal with for h = C*r in region of transition slope; crosssection of shoal bathymetry through centerline included
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144 Figure 619 shows reasonable agreement between the models with the exact model having smaller oscillation magnitudes in the longshore direction with differences between the results less than 1 % 1 1 r, Q) "Cl 2 1 08 1 06 1 04 "6.. 1 02 E <( Q) ~ 1 (1) Q) O:'. 0 98 0 96 0 94 1 E C 2 1 5 (1) w 10 5 0 R value (m) 50 Y Distance (m ) (so li d) Step Model [Ns = 10] (o) Exact Sol u t i on Model h = C r C= 0 2 R 1 = 10 m R 2 = 5 m T = 12 s Xp = 1 00 m 100 1 50 Figure 619: Relative amplitude for longshore transect at X = 100 m for shoal with for h = C*r in region of transition slope; crosssection of shoal bathymetry through centerline included. 6.4 Wave Angle Modification Previous plots of the relative amplitude in a domain with a bathymetric anomaly have demonstrated the divergence and convergence of the wave field near the anomaly due to wave sheltering and focusing, respectively. The divergence and convergence of the wave field can also be viewed by examining the wave angle modification near a bathymetric anomaly. The method for calculating the wave angles is contained in Appendix A.
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145 A contour plot of the wave angle for a pit with a gradual depth transition is shown in Figure 620. As in the previous figures the waves are incident from left to right with an incident angle equal to 0 with positive wave angles measured counter clockwise. Leeward of the pit a divergence in the wave field occurs with the waves "spreading out" due to the increase in depth over the pit. The wave angles inside the pit were not calculated due to the complex nature of the solution in this region. The wave directions are antisymmetric in the longshore direction about the center of pit with oscillations in the wave angle occurring in the longshore indicating the diffraction pattern caused by the pit, as in the relative amplitude results 200 150 100 :[ 50 C 0 :p 0 u 0 >50 100 150 200 100 0 100 200 X Direction (m) 300 400 500 2 :[2 5 C 3 a, w3 5 15 10 4 .___ ___ ___, 30 20 10 0 R value (m) Figure 620: Contour plot of wave angles in degrees for pit with k 1 h 1 = 0.24 and transition slope = 0.1; crosssection of pit bathymetry through centerline included
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146 The wave angle modification caused by a shoal with a Gaussian transition in depth and a uniform depth inner region is shown in Figure 621 with the inset diagram showing the shoal bathymetry The Gaussian shoal is seen to cause a focusing of the wave field in the lee of the shoal as the waves converge over the decreased depth of the shoal. Although not clearly indicated by the resolution of the contour plot the results were found to be antisymmetric in the longshore about the center of the shoal. The shoal is seen to cause less wave field modification than the pit in the previous plot with much smaller wave angles resulting leeward of the shoal. 300 200 100 I C: 0 u 0 0 >100 200 300 100 0 100 200 300 X Direction (m) 2 r 2 2 2 4 ;:::...1 ~ 2 6 Q) W 2 8 3 6 4 50 40 30 20 1 0 0 400 500 R va l ue (m) Figure 621 : Contour plot of wave angles for Gaussian shoal with C 1 = land C 2 = 10 for k1h1 = 0.22; crosssection of shoal bathymetry through centerline included with 23 steps approximating slope The impact of the transition slope on the wave angle was investigated using the constant volume constant depth pits first shown in Figure 69. The wave angle for a longshore transect located 300 m from the center of the pits is shown in Figure 622 for
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147 k 1 h 1 = 0.15. Decreasing the transition slope is seen to increase slightly the magnitude of the wave angle oscillations in the longshore 4 ~~ ,,,,, 3 2 cl Cl) ~o Cl C <( Cl) 1 > 2 3 4 k 1 h 1 = 0 15 Xp=300m 1 2 5 C 2 3 (1J a, iii 3 5 'I t: :, 1_1 \ I I h ~ : I '; : I ~ I I ;~ I ;i I : 4 .__._~~~ 30 20 10 0 R value (m) 5 '~~ ~~~~ 0 50 100 150 200 250 300 Y Distance (m) Figure 622: Wa v e angle for alongshore transect at X = 300 m for same depth pits for k 1 h 1 = 0 15; crosssection of pit bathymetries through centerline included with slopes of abrupt, 1, 0.2 and 0 07. Negative angles indicate divergence of wave rays. 6.5 Comparison of 3D Step Model to Numerical Models Threedimensional numerical models for nearshore wave transformation can be employed to validate the 3D Step Model for similar bathymetries. As in comparing any models care must be taken to ensure the models are representing comparable processes and are used within their limits The widely used numerical model REF/DIF1 (Kirby and Dalrymple 1994) and a 2D fully nonlinear Boussinesq model (Kennedy et al. 2000) were employed to assess the results of the 3D Step Model for a uniform domain containing a bathymetric anomaly. REF/DIF1 has been compared to laboratory data from Berkhoff et al. (1982) for a submerged shoal on a sloped, plane beach. Using its
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148 composite nonlinear wave theory REF/DIF1 was shown to be quite accurate in predicting the wave field. Boussinesq models have shown very good agreement to laboratory data for numerous bathymetries including the Berkhoff et al. (1982) shoal with the results being quite reasonable. Thus, while the 3D Step Model can only be compared to the laboratory data from a single experiment (Chawla and Kirby, 1996) for the wave field modification by a bathymetric anomaly with gradual transitions in an otherwise uniform domain, comparing the 3D Step Model to numerical models can provide a certain level of validation for many domains as the numerical models have been compared successfully to laboratory data. 6.5.1 3D Step Model Versus REF/DIF1 REF/DIF1 (Kirby and Dalrymple, 1994) is a parabolic model for monochromatic water waves that is weaklynonlinear and accounts for wave refraction, diffraction, shoaling, breaking, and bottom friction. REF/DIF1 assumes a mild bottom slope and has been found to remain accurate for slopes up to 1 on 3 byBooij (1983). REF/DIF1 was run with no wave energy dissipation and with linear wave theory in order to most closely match the limitations of the 3D Step Model. One difference between REF/DIF1 and the 3D Step Model is that upwave scattering (reflection) caused by a bathymetric anomaly is not handled by REF/DIF1. The 3D Step Model and REF/DIF1 results for a crossshore transect of the relative amplitude are shown in Figure 623. A crosssection of the bathymetric anomaly used in the 3D Step Model taken through the centerline for this comparison is shown in the inset diagram where 23 steps approximate the slope. A grid spacing of 5 m was used in the x and y directions for REF/DIF1, which resulted in a coarser resolution for the anomaly than in the 3D Step Model. The solid line in the main plot shows the relative
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149 amplitude for the 3D Step Model and indicates slight reflection upwave of the pit and significant wave sheltering shoreward of the pit that diminishes with distance from the pit. The circles show the REF/DIF1 results for the case of linear wave theory, and generally shows good agreement with the 3D Step Model results; however, upwave of the pit the REF/DIF1 results identically equal 1 as reflection is not considered. 0 9 0 8 2 2 E i2.4 c1 = 1 m 2.6 c2 = 20 m Q) rflat = 20 m w Q) 2 8 N = 23 .... .... .. .... 0 7 a. E 3 '~~ .,,,,' &0.5 0 4 T=12s 0 3 Y = 0 100 ... _____ ,; (solid) Analytic Model [N = 23] (o) REF/DIF1 [linear dx=dy=5m] 50 R value (m) ,, ., ,,,,// 0 2 (dash) REF/DIF1 [nonlinear, H=0.2rffl!~~~ ,, 0 .... .. ,, 100 0 100 200 300 400 500 600 700 800 X Distance (m) Figure 623: Relative amplitude using 3D Step Model and REF/DIF1 for crossshore transect at Y = 0 for Gaussian pit with k 1 h 1 = 0.24; crosssection of pit bathymetry through centerline included. The dashed line indicates results from REF/DIF1 using composite nonlinear wave theory (Kirby and Dalrymple 1986) for an incident wave height of 0.2 m. The nonlinear results follow the linear results over the pit and at small ( < 50 m) downwave distances. At large downwave distances the nonlinear results diverge significantly from the linear results and indicate much less wave sheltering due to the pit. The nonlinear REF/DIF1 results were
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150 found to approach the linear results as the wave height was decreased to very small values and the waves become more linear. The 3D Step Model and REF/DIF1 results were also compared for transects in the longshore direction. Figure 624 shows the relative amplitude for a longshore transect located at Xp = 100 m. The 3D Step Model and REF/DIF1 (linear) results overlay each other for longshore distance less than m. The REF/DIF1 (nonlinear) results show good agreement with the models using linear wave theory as the crossshore location of the transect is not in the region shown in Figure 623 where the nonlinear and linear results diverge At large longshore distances the 3D Step Model and REF/DIF1 (linear and nonlinear) results diverge as the minimax wideangle parabolic approximation (Kirby, 1986) used in REF/DIF1 is violated at these locations. 1 4~~~~ QI "O :, 1 3 1 2 1 1 i1 E <( QI io 9 Ill Q) a:: o s I C: :.8 2 5 0 7 Ill ai w 0 6 50 0 R value (m) I I I f Xp=100m ,/ (solid) Analytic Model [N = 23) (o) REF/DIF1 [linear, dx,dy=5m] (dash) REF/DIF1 [nonlinear H=0 m] 0 5 ~ ''...,__ _ ___, _ __,__ __ _J 300 200 100 0 100 200 300 Y Distance (m) Figure 624: Relative amplitude using 3D Step Model and REF/DIF1 for longshore transect at X = 100 m for Gaussian pit with k 1 h 1 = 0.24; crosssection of pit bathymetry through centerline included.
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151 A transect of the relative amplitude at Xp = 400 mis shown in Figure 625 This transect lies in the region where the REF/DIF1 (nonlinear) results diverge from the REF/DIF1 (linear) and 3D Step Model results and significant differences are shown for longshore distances, IYI < 300 m. The difference between the nonlinear and linear results is seen to diminish for large longshore distances Cl) 0 ::, 1 6 ,.. ,,,, 1 4 1 2 I E: 1 I I I a. E <( Cl) I io s ai I I I \ er I 0 6 c: 22 5 cu 0.4 [ij 3 c__ ___ '""= 100 50 0 R value (m) I I I I I I I Xp = 400 m (solid) Analytic Model [N = 23 ] (o) REF/D I F1 [linear dx dy=5m] (dash) REF/DIF 1 [nonlinear H=0 2 0 2 ~ ~~ ~~~~ 600 400 200 0 200 400 600 Y Distance (m) Figure 625 : Relative amplitude using 3D Step Model and REF/DIF1 for longshore transect at X = 400 m for Gaussian pit with k 1 h 1 = 0.24; crosssection of pit bathymetry through centerline included. As in the previous figure the 3D Step Model and REF/DIF1 (linear) results show good agreement. The divergence in the results seen in the previous figure at m due to the wide angle approximation being violated does not occur until longshore distances greater than 500 m due to the crossshore location of the transect in Figure 625. REF/DIF1 can also be used to validate the wave angles calculated using the 3D Step Model. Figure 626 shows the wave angles for alongshore transect located at Xp = 400 m for the same bathymetry as for the last 3 figures. The results are only plotted for
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152 onehalf of the longshore transect as the wave angles are antisymmetric about Yp = 0 The 3D Step Model and REF/DIF1 (linear) results show good agreement with a slight divergence in the results at the larger longshore distances. The REF/DIF1 (nonlinear) results show significant differences in the magnitude of the wave angle at longshore distances less than 100 m with better agreement in the magnitude as longshore distance mcreases. 4 2 Q) '\ \ \ \ ' ' I I ' ' t I ' ' ' I I t t t t I I ' I 3: 4 I t I t I I I t I 6 Xp = 400 m I I t I t I I I C B2 s "' ai [jj 8 ( sol i d ) Analytic Model [N = 23) 3 L_ ____ ...c.=z:.=,, 100 50 0 ( o ) REFIDIF1 {linear dx dy = Sin) ( dash ) REFIDIF1 {no11l i near H=0 2 m) R value (m) 10 ~~~~~~ 0 100 200 300 400 500 600 Y Distance (m) Figure 626: Wave angle using 3D Step Model and REF/DIF1 for longshore transect at X = 100 m for Gaussian pit with k 1 h 1 = 0.24; crosssection of pit bathymetry through centerline included. The 3D Step Model was also compared to REF/DIF1 for a pit with linear transitions in depth with a slope equal to 0.1. The intent was to create a bathymetry that would cause significant reflection and to compare the results of the 3D Step Model which accounts for reflection, to REF/DIF1, which does not allow reflection in the upwave direction Figure 627 shows the relative amplitude for a transect taken in the crossshore direction with a crosssection of the pit taken through the centerline shown in
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153 the inset. In this example 10 steps approximate the linear slope in the 3D Step Model and a grid spacing of 4 min the x and y directions was employed in REF/DIF1. 0 9 ~08 :e 0. E ~0 7 Q) > ~06 0 5 0.4 1 1 5 C 2 2 "' a'i w 2 5 40 20 0 R value (m) Y=O (so l id) Analyt i c Model [N=10) (o ) REF/DIF1 [linear dx=dy=4m 0 3 ~~~~~~~~~~~~ 100 50 0 50 100 150 200 250 300 350 400 X Distance (m) Figure 627: Relative amplitude using 3D Step Model and REF/DIF1 for crossshore transect at Y = 0 for pit with linear transitions in depth with k 1 h 1 = 0 24; crosssection of pit bathymetry through centerline included with slope = 0.1. The 3D Step Model results (solid line) indicate significant upwave reflection in the upwave region with wave sheltering in the downwave region. The relative amplitude values for REF/DIF1 employing linear wave theory show good agreement with the 3D Step Model results in the downwave region with a slight divergence inside and just downwave of the pit. Thus, the reflection captured by the 3D Step Model does not result in significant differences in the relative amplitude in the downwave region for the two models for this crossshore transect. The relative amplitude can also be viewed in the longshore direction for a transect at Xp = 300 m in Figure 628. The results are only plotted for onehalf of the longshore transect as the relative amplitude values are symmetric about Yp = 0 The 3D Step
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154 Model and REF/DIF1 results show good agreement for small longshore distances in the main region of wa v e sheltering As the relative amplitude oscillates in the longshore direction the peak values ofREF/DIF1 show greater focusing and sheltering (around 3 % ) than for the 3D Step Model. The difference in the results of the two models in the longshore direction might be attributed to the reflection that is included in the 3D Step Model but not REF/DIF1. Divergence in the results of the 3D Step Model and REF/DIF1 at these locations is not apparent in the longshore transects shown in Figures 624 and 625 which are for a gradual pit with little reflection. 1 6 ~~~~~~~ Xp= 300 m ( sol i d) Ana l yt ic Mode l [N= 1 0] REF/D I F 1 [l i near dx=dy=4m 1 .4 1 1 2 ::15 C: ,g 2 ro t a> <( 1 w 2 5 Q) ?. 1ii Q) O::'. 0 8 R value (m) 0 6 I I I I I I I I I I I I I 0 AL__'"'"'__, 0 50 100 150 200 2 50 300 Y Distance (m) Figure 628: Relative amplitude using 3D Step Model and REF/DIF1 for longshore transect at X = 350 m for pit with linear transitions in depth with k 1 h 1 = 0 24 ; cross section of pit bathymetry through centerline included with slope = 0 1 6.5.2 3D Step Model Versus 2D Fully Nonlinear Boussinesq Model The 3D Step Model was also compared to a 2D fully nonlinear Boussinesq numerical model developed by Kennedy et al. (2000). The Boussinesq model used in the comparison accounts for wave refraction diffraction, reflection shoaling breaking
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155 nonlinear wavewave interactions and bottom friction Boussinesq models have been shown to give good estimates of the wave height, direction, shape and transformation when compared to a growing collection of laboratory data (Kirby et al., 1998) The 3D Step Model was compared to the Boussinesq model for an abrupt circular shoal of radius and height equal to 1 m and 0.15 m respectively, lying in an uniform domain of depth equal to 0 3 m. Figure 629 shows the relative amplitude for a transect taken in the crossshore direction with the inset diagram showing a crosssection of the shoals used, taken through the centerline. An abrupt shoal is not an applicable domain for a Boussinesq model so a smoothing filter was used to create more gradual transitions in depth. 1.4 (solid) Analytic Step Model (abrupt) (dash) Analytic Step Model (N=6) Q) "O 1 3 1 2 ci E <( Q) > 1 1 Q) Cl:'. 0 9 15 (0) 2D Nonlinear Boussinesq Model 10 5 I I ,,, ') 0 0 15 E 0 2 C: 0 i 0 25 w I ' I I ,. I I I I 0.3t==~ ~__J 1 5 0 5 R value (m) 5 10 X Direction (m) 15 Figure 629: Relative amplitude using 3D Step Model and 2D fully nonlinear Boussinesq model for crossshore transect at Y = 0 for shoal with k 1 h 1 = 0.32; cross section of pit bathymetry through centerline included.
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156 The inset diagram shows two shoals with the solid line indicating an abrupt shoal and the dashed line representing the abrupt shoal after two smoothing passes in the both the longshore and crossshore directions. The "smoothed" shoal was evaluated using the 3D Step Model with 6 steps approximating the form, which is similar to the one used in the Boussinesq model. The solid and dashed lines in the main plot show the relative amplitude for the abrupt and smoothed shoals, respectively, using the 3D Step Model. The circles show the results of the Boussinesq model for an incident wave height and period of 0.01 m and 3.5 s, respectively. It should be noted that Boussinesq models were not derived for steep slopes used in this comparison. To calculate the relative amplitude from the Boussinesq model, the wave height was determined from Re!Amp = H(x) whereH(x) = with cr equal to the H, standard deviation, ri(x,t) equal to the water surface time series, and H 1 equal to the incident wave height. In both the upwave region where significant reflection occurs and in the downwave focusing, the 3D Step Model and Boussinesq model results compare well with the stepped, smoothed shoal showing better agreement than the abrupt shoal. The Boussinesq model results upwave of the shoal indicate a mean value above unity, a result of dividing the nonlinear waveform upwave of the shoal by the linear incident wave height. The maximum value of the Ursell parameter for the Boussinesq model over the shoal and upwave of the shoal are 68.3 and 14.2, respectively. 6.6 Comparison to Laboratory Data of Chawla and Kirby (1996) The requirement of uniform depth outside of the bathymetric anomaly in the Step Method greatly limits the available laboratory data for comparison. The laboratory experiment of Chawla and Kirby (1996) is the only experiment known to the author with
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157 wave measurements in a domain of uniform depth that contains a bathymetric anomaly The bathymetric anomaly in Chawla and Kirby is a shoal of 2.57 m radius with the shape of the shoal being the upper portion of a sphere with a radius of 9 1 m. The dimensions for the basin used in the experiment were 18.2 m in the longshore direction and 20 m in the crossshore direction. Further details of the experiment and the collected data can be found in Chawla and Kirby (1996) The data collected during the experiment of Chawla and Kirby that fits within the constraints of the Step Method are comprised of 3 different tests (Tests 1 2 and 4) for monochromatic nonbreaking incident waves with wave heights collected along se v en transects. To compare with the step method the data from Test 4 were used along four of the seven transects. A schematic of the laboratory setup with the transect locations used in the comparisons is shown in Figure 630 with the shoal is centered at (0 0) 1 0 ~~~~~ 8 I 2 Q) u C: 0 0 >2 4 6 8 SIDEWALL BEACH \ S I DEWALL ""'""''"'"''''""'"'"'"'"'"""'' '"'"'"'''"'"'"' 0 '""'''""""''"'"""'"'''"""" ""'"'"'"""""''"""' 10 ~'''__J 5 0 5 10 1 5 X Distance ( m ) Figure 630: Experimental setup of Chawla and Kirby (1986) for shoal centered at ( 0 0) with data transects used in comparison shown.
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158 The relative amplitudes along Transect AA for the Analytic Model and the Chawla and Kirby (1986) data are shown in Figure 631. An inset diagram is including showing the bathymetry with the shoal being approximated by 15 steps in the 3D Step Model. Also included in the main plot is the relative amplitude from FUNW A VE 1.0 [2D] (Kirby et al., 1998) FUNW AVE 2D is a twodimensional fully nonlinear Boussinesq model based on the equations of Wei et al. (1995), which has been successfully compared with the data of Chawla and Kirby (1986) The specifications of the inputs for FUNW A VE 2D necessary to model the experiment of Chawla and Kirby (1986) are included in the freely distributed code for the numerical model and were used to generate the FUNW AVE 2D results shown here. The incident wave height and period are 0.0233 m and 1 s respectively. 3 5 ~~~~ ~~Cl) 'O ::, 3 2 5 t 2 E <( Cl) 1 5 l1l ai a:: 1 .... Yp = 0 0 5 (solid) Analytic Model [N = 15] (dash) FUNWAVE 2D (o) Chawla and K i rby (1996) Data 0 1 I.02 C: 0 aj 0 3 [j] 0 4 3 0 2 R value (m) o ~~~~ __ ..,_ __ .._ ____.__ 4 2 0 2 4 6 8 X Distance (m) 0 ,.. 1' , I I \ \ '.! 10 12 Figure 631: Relative amplitude using 3D Step Model, FUNW AVE 2D and data from Chawla and Kirby (1996) for crossshore transect AA with k 1 h 1 = 1.89; crosssection of shoal bathymetry through centerline included.
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159 Good agreement is shown in Figure 631 between the 3D Step Model and the data of Chawla and Kirby. FUNW A VE 2D is found to agree well with the data up to X = 5 m, where oscillations in the relative amplitude commence. Nonlinear effects could cause the difference in the maximum relative amplitude values over the shoal for the Step Model and those of the data and FUNW AVE 2D The maximum value of the Ursell parameter for the FUNW A VE 2D results over the shoal is 83.13, while the maximum value upwave of the shoal is 0.60 Both the 3D Step Model and FUNW AVE 2D indicate smaller relative amplitude values shoreward of the shoal ( 4 < X < 6 m). The relative amplitude values for longshore Transect EE, which lies over the shoreward side of the shoal, are found in Figure 632. For each data point, the 3D Step Model results show good agreement with the data of Chawla and Kirby (1996). Q) "O 2 6 2 2 e 1 8 Q. E <( Q) 1.4 "' Q) er 0 6 Xp = 1 35 m (solid) Analytic Model [N = 15] (dash) FUNWAVE 2D (o) Chawla and Kirby (1996) Data ' 0 1 E ~02 0 ~0 3 Q) w 0.4 3 2 0 R value (m) 0 2 ~~~'''___J 6 4 2 0 2 4 6 Y Distance (m) Figure 632: Relative amplitude using 3D Step Model, FUNW A VE 2D and data from Chawla and Kirby (1996) for longshore transect EE with k 1 h 1 = 1.89; crosssection of shoal bathymetry through centerline included
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160 The FUNW AVE 2D results nearly match those of the 3D Step Model with a smaller peak value at Y = 0 and a slight asymmetry in the values due to a slight asymmetry in the experimental setup (sidewall locations), and therefore the FUNW A VE 2D domain. The relative amplitudes along Transects DD and BB are shown in Figures 633 and 634, respectively. In each figure the 3D Step Model is seen to have relative amplitude values that are comparable to the data of Chawla and Kirby (1996) and FUNW AVE 2D. 1 8 ~~~~ Xp=2 995m n (solid) Analytic Model [N = 15] : 1 6 dash)FUNWAVE2D : (o) Chawla and Kirby (1996) Data 1.4 Q) 1 2 I 0 :e a. E 1 <( Q) > ~0 8 Q) 0 a:: 0 6 0.4 0 2 0 8 6 4 2 0 0 f' I ' I I 0 0 I I Y Distance (m) I I I I I 0 IDTZl 0 2 ~0 3 ai w 0 4 3 2 1 0 R value (m) 2 4 6 8 Figure 633 : Relative amplitude using 3D Step Model, FUNW AVE 2D and data from Chawla and Kirby (1996) for longshore transect DD with k 1 h 1 = 1.89; crosssection of shoal bathymetry through centerline included. In Figure 633 the data of Chawla and Kirby (1996) show large(> 1.4) values directly shoreward of the shoal where the 3D Step Model and FUNW AVE 2D results indicate values around 1.1; a result first shown in Figure 631. Overall the agreement between the Analytic Step Method and experimental data of Chawla and Kirby (1996) is found to be acceptable.
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2 1 o 1 C 0 2 0 ~ 0 3 Q) oui 0.4 161 0 """"''' 3 2 0 Xp = 6 12 m (solid) Analytic Model [N = 15) (dash) FUNWAVE 2D (o) Chawla and Kirby (1996) Data , I I :o: I I I Q) 1.5 R value (m) 0 "O :e a. E <( Q) > ai O:'. I I I I I I I I I I I I I I 0.5 / I I I I I I I I I I I I \ I I I I I I I I I I 0 q I I I I I I I I I I I I I I I I I I o' I I I I I I I I I I I I I It 0 '''~~~~~~ 8 6 4 2 0 2 4 6 8 Y Distance (m) Figure 634: Relative amplitude using 3D Step Model, FUNW A VE 2D and data from Chawla and Kirby (1996) for longshore transect BB with k 1 h 1 = 1.89; crosssection of shoal bathymetry through centerline included. 6.7 Direction Averaged Wave Field Modification The results presented thus far have been for a monochromatic incident wave from a single direction; however, a natural wave field is known to consist of many wave directions and periods Since the 3D Step Model employs linear wave theory, solutions can be superimposed to create a wave field that is averaged over several directions or periods, thereby creating more realistic incident wave conditions. Figure 635 is a plot of the relative amplitude for alongshore transect where the relative amplitudes are an average of the values obtained with incident wave directions from 10 to 10 deg taken every 2 deg. Two averaging procedures were used. The solid line is the average relative amplitude with each incident direction having the same weight or frequency while the dashed line is the average relative amplitude where the incident
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162 directions were weighted in the following manner: 0 deg (30%), deg (15%) deg (10%), deg (6 % ), deg (3%), deg (1 %). The dotted line on the plot is the relative amplitude for an incident wave directed normal to the transect (0 deg). A cross section of the pit used in the models taken through the centerline is shown in the inset diagram. The transect was located 300 m shoreward of the pit and k1h1 = 0.24 1 4 ~~ ~ ~ ~ ,r,,, , 1 3 1 2 1 1 Q) 1 a. E <( 0 9 Q) > ai 0 8 a:'. 0 7 :'. ) : , , , I Xp=300m \ 0 6 k 1 h 1 = 0 24 .\ (solid) Direction Averaged [10 : 2 : 1 OJ \ 0 5 (dash) Direction Averaged [weighted)'""' / (dot) Single D i rection (0 deg) ., 4'== 30 20 10 0 R value (m) 0 4 L__ __ L__ __J L,_ __J __ __J __ __J __ __J __ __, __ __, 400 300 200 100 0 100 200 300 400 Y Distance (m) Figure 635: Relative amplitude averaged over incident direction (centered at 0 deg) for alongshore transect at X = 300 m for pit with k 1 h 1 = 0.24; crosssection of pit bathymetries through centerline included with slope = 0.1. The weighted average ( dashed line) is shown to reduce the oscillations in longshore direction with the reduction increasing with longshore distance away from the pit and the phasing of the oscillations unchanged. There is only a slight reduction in the wave sheltering directly shoreward of the pit using the weighted average Averaging over the 11 directions with no weighting (solid line) greatly reduces the oscillations in the longshore directions and also changes the phasing of the oscillations. The unweighted
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163 averaging technique is shown to result in a significant reduction in the sheltering shoreward of the pit and in the focusing bands that border the sheltering Averaging over a few periods around 12 s, while also averaging over the 11 directions, was found to produce slightly more dampening of the oscillations in the longshore while maintaining the features directly shoreward of the pit. The effect of averaging over incident wave direction on the wave angle is shown in Figure 636 for the same incident wave conditions as for the previous figure Both averaging procedures are shown to reduce the wave angles along the entire transect, with the greatest reduction at large longshore distances. 10 8 6 4 OJ 2 Q) Cl 0 C: Q) > 2 4 6 8 10 400 Xp = 300 m k 1 h 1 = 0.24 \ \ I \ / \ I _. ,~ (solid) Direction Averaged (10 : 2: 1 OJ (dash) Direction Averaged [weighted] (dot) Single Direction (0 deg) 300 200 100 .~ ... _: :. f ,, I \ . \ 1 \ I \ 0 100 200 Y Distance (m) 300 400 Figure 636: Wave angle averaged over incident direction (centered at 0 deg) for alongshore transect at X = 300 m for pit with k 1 h 1 = 0.24 with bathymetry indicated in inset diagram of previous figure
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164 As in the previous figure, the weighted averaging results in a reduction of the longshore oscillations with the effect increasing with longshore distance, and no change to phase of the oscillations. The unweighted averaging is shown to reduce the wave angles significantly along the entire transect, with changes to the phasing of the oscillations. The unweighted average wave angles indicate a divergence in the wave field shoreward of the pit without the small area of convergence seen for the case of normally incident waves. Averaging around an incident wave direction of 20 degrees was performed for Figures 637 and 638, which show the longshore transects of the relative amplitude and wave angle, respectively. As in the previous example two averaging procedures were used with the solid line indicating the average value with each incident direction having the same weight or frequency and the dashed line is the weighted average value: 20 deg (30%), 20 deg (15%), 20 deg (10%), 20 deg (6%), 20 deg (3%), 20 deg (1 %). Figure 637 shows the relative amplitude values with the area of wave sheltering shifted in the longshore direction due to the incident wave angle. The weighted averaging technique is shown to result in a dampening of the longshore oscillations with no changes to the phasing, while the unweighted averaging results in a larger reduction in the relative amplitude values, especially at small longshore distances, and changes in the phasing. The oscillations in the negative Y direction are found to have a smaller wavelength than the oscillations in the other longshore direction, a result of the transect orientation for oblique wave incidence. Figure 638 shows similar features for the wave angles with the area of wave divergence being shifted in the longshore direction.
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165 1 4 ~,,,,,,,,,, 1 3 1 2 1.1 Q) Xp = 300 m k 1 h 1 = 0 24 (solid) Direction Averaged [10 : 2 : 30] ': (dash) Direction Averaged [weighted] : \ (dot) Single Direction (20 deg )". J \ I I ' ' I a. I E a;0 8 Cl'. 0 7 0 6 0 5 2 I25 C 2 3 "' > dl3 5 20 10 0 R value (m) ' , I / I I I I I I I : \ I ~ 0.4 ~ ~~~~~~~~ 400 300 200 100 0 100 200 300 400 Y Distance (m) Figure 637: Relative amplitude averaged over incident direction (centered at 20 deg) for alongshore transect at X = 300 m for pit with k 1 h 1 = 0.24; crosssection of pit bathymetries through centerline included with slope = 0.1. 30 ~~~ 25 cl Q) Q) g>20 <( Q) > 3 15 Xp= 300 m k 1 h 1 = 0 24 (solid) Direction Averaged [10 : 2 : 30] (dash) Direction Averaged [weighted] (dot) S i ngle Direction (20 deg) .. 10 ~~~~~~''' 400 300 200 1 00 0 100 200 300 400 Y Distance (m) Figure 638: Wave angle averaged over incident direction (centered at 20 deg) for alongshore transect at X = 300 m for pit with k 1 h 1 = 0.24 with bathymetry indicated in inset diagram of previous figure.
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166 6.8 Energy Reflection Unlike the twodimensional case of waves over a trench or shoal of infinite length determining the energy reflection from a bathymetric anomaly in three dimensions is not trivial. To determine the energy reflection caused by a three dimensional bathymetric anomaly a method was developed using farfield approximations of the Bessel functions along a halfcircular arc bounding the region of reflected energy A reflection coefficient was obtained by summing the reflected energy through this arc and comparing it to the amount of energy incident on the anomaly The complete formulation of the farfield energy reflection method is presented in Appendix B 6.8.1 Comparison to Prior Results The farfield energy reflection method will first be compared to a shallow water method that sums the energy flux through a transect. In Bender (2001) a method to calculate the energy reflection caused by bathymetric anomalies in shallow water was developed This method used a timeaveraged energy flux approach in which a transect was created outward from the center of the anomaly in the longshore direction and parallel to the incident wave fronts. At each location in the transect the energy flux was determined, which allowed for the total energy flux through the transect to be summed and compared with the energy flux through the transect if no pit were present resulting in a reflection coefficient. Figure 639 shows the reflection coefficient, KR, versus pit diameter divided by the wavelength outside the pit for the farfield approximation method and the shallow water transect method. In order to maintain shallow water conditions the transect method
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167 requires increasing the pit radius to obtain KR for larger values of the nondimensional diameter; therefore 4 different pit radii are included for the transect method results 0 25 0 2 0 15 0 1 0 05 FarField Approximation [ h = 2 m d = 4 m] (solid) R = 30 m (dash) R = 75 m Transect Method (shallow water) [h = 2 m d = 4 m] (+) R = 6 m (o) R = 12 m (*) R = 25 m (x) R = 75 m 0 ''__J.''''__J.''~ 0 0 2 0 4 0 6 0 8 1 2 1.4 1 6 1 8 2 Diameter/L 1 Figure 639: Reflection coefficient versus nondimensional diameter; comparison between shallow water transect method and farfield approximation method Two different pit radii were used for the farfield approximation method with little difference in the values indicated in the results. The transect method values for each of the four radii used show good agreement with the results of the farfield approximation method with the largest difference at a nondimensional diameter of 0 9. 6.8.2 Effect of Transition Slope on Reflection The effect of the transition slope on the reflection was investigated using the step method and the farfield approximation for the reflection coefficient. In an attempt to isolate the effect of the transition slope, bathymetric anomalies of constant volume were created either by keeping the depth or the bottom radius constant. Figure 640 shows the
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168 reflection coefficient versus k 1 h 1 for four pits in the shape of truncated cones with constant volume and equal depth; these are the same pit configurations used in Section 6.3 in Figures 69 to 612 The gradual transition slopes are seen to greatly change the reflection properties of the pits The KR values for each pit are seen to oscillat e with k 1 h 1 with the trend of KR decreasing as k 1 h 1 increases. For the more gradual transition slopes the oscillations are almost completely damped for the larger k 1 h 1 values. The only occurrence of complete transmission (KR = 0) is the trivial solution of k 1 h 1 = 0. This differs from the result for symmetric twodimensional trenches of infinite length with the same depth on both sides of the trench, where for each oscillation there is an instance of complete transmission. 0 25 0 2 0 15 0 1 0 0 5 ,._ i I I I I I 1 I 1 0 2 0 4 .. . ________ _ _ 2 !... t, \ I : I ; ': I : f~ 1 2 5 C ,g 3 ro ai W 3 5 . ,.., .. : I :,~ ;~ 1 I I ,: 4 ......_ _____ ...J _J 2 0 10 0 ... ,,.. ... .. .... . ... ,, ..... ....... ..,. .. .. ,. ,,,.:.:.:.:.: __ ... .... ......... .. 0 6 0 8 Figure 640 : Reflection coefficient versus k 1 h 1 based on farfield approximation and constant volume and depth pits; crosssection of pit bathymetries through centerline included with slopes of abrupt 1 0.2 and 0.07.
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169 The reflection caused by a pit is shown to depend greatly on the pit bathyrnetry and the nondimensional wave number. The abrupt pit is shown to have the largest KR value at k 1 h 1 = 0.15; however, at k 1 h 1 = 0 30 the pit with a transition slope of 1 has the largest KR value and the pit with a slope of 0.2 has a value that approaches the more abrupt pits. The wave field for these instances is shown in Figures 69 and 610, which show the relative amplitude along a crossshore transect at k 1 h 1 = 0.15 and 0.3, respectively. Reviewing Figure 69 indicates that the abrupt pit clearly causes the largest reflection upwave of the pit, and Figure 610 shows that the pits with slopes of 1 and 0.2 cause a slightly larger reflected wave than the abrupt pit. The reflection coefficients for four pits (truricated cones) of equal volume with constant bottom radius (slope: abrupt, 1, 0.2, 0.05) are shown in Figure 641. 0 25 0 2 0 15 "' 0 1 0 05 I I I\ \ \ I \ I 0 2 2 125 C 2 3 C\l iii W 3 5 I "' ; \ I ,. ~ I . : \ \ 30 : .. 1 , :, 20 ... .... ___ \;\ .............. .. \ ...... ... .,. ... ........... .... , _; .... ... ...... ,_ ~ _:',;,i,"':.:;~.:.:".::'~"0 4 0 6 0 8 Figure 641: Reflection coefficient versus k 1 h 1 based on farfield approximation and constant volume bottom width pits; crosssection of pit bathyrnetries through centerline included with slopes of abrupt, 1, 0.2 and 0.05.
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170 The smaller transition slopes are seen to reduce greatly the reflection caused by the pit for most values ofk 1 h 1 The pit with transition slope of0.2 is shown for all the pits with k 1 h 1 :::::: 0.27 to have the largest KR As in the previous figure KR is shown to oscillate with k 1 h 1 with a decreasing trend as k 1 h 1 increases and no instances of complete transmission The reflection coefficients for four shoals of equal volume and depth are shown in Figure 642 The same shoal configurations were used as in Figure 613. The more gradual transition slopes are seen to produce less reflection than the more abrupt slopes as seen previously. The reflection coefficient is seen to oscillate with k 1 h 1 with the general trend of the KR values increasing with k 1 h 1 for all slopes except the most gradual; a result that differs from the case for a pit. 0 3 0 25 0 2 0 15 0 1 0.05 I I I I ,, ;
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171 6.9 Analytic Nearshore Shoaling and Refraction Method The 3D Step Model requires a uniform depth outside of the bathymetric anomaly, which limits its use in the nearshore zone where shoaling and refraction occur due to changes in depth. To overcome this limitation an analytic nearshore shoaling and refraction method was developed The Analytic Shoaling and Refraction Model (Analytic SIR Model) uses wave height and direction values determined from the 3D Step Model as the initial conditions at a crossshore location where a region of uniform depth joins with a nearshore region with a defined slope. The Analytic SIR Model propagates the waves in the nearshore region up the slope the to the point where depth limited breaking occurs; the theory and formulation for the model are found in Appendix C. The bathymetries for two cases used in the Analytic SIR Model are shown in Figure 643. In both cases the center of the pit lies in a region of uniform depth and is centered at X = 0 m with the nearshore region commencing at X = 600 m. For Pit 1 both the transition slopes and the nearshore slope are linear with values of 0.1 and 0.02, respectively with 10 steps defining the transition slope and a crossshore spacing of 1 m in the nearshore region. For the second case, Pit 2, the side wall slopes are of Gaussian form with C1 and C2 equal to 1 m and 10 m, respectively with 23 steps defining the slope. The nearshore region for this case has an Equilibrium Beach Profile form defined by 2 h = Ax 3 with A equal to 0.1 m 1 1 3 and a crossshore spacing, dx, equal to 1. In all models run the base conditions were an incident wave height and period of 1 m and 12 s, respectively.
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172 o ~~~~~..r.. Case~ Pit 1 , , .' , , 4 ,.___===''''''' 100 0 100 200 300 400 500 600 7 00 X Pos i t i on ( m ) o ~~~~~~~~~~; Case~ Pit 2 ; ,, ; ________________ ., / ; , , I I 4 c...__==''__.l.__''''' 100 0 100 200 300 400 500 600 700 X Position (m) Figure 643 : Ba t hymetry for two nearshore regions used in analytic shoaling and refraction model: Pit 1 ; linear transition slopes with linear nearshore slope and Pit 2 ; Gaussian transition slopes with Equilibrium Beach form for nearshore slope. The results of the Analytic SIR Model for Pit 1 are shown in Figure 644 The upper plot in Figure 644 shows the wave height values at the start of the nearshore region (X = 600 m) and at the breaking location after the wave transformation processes of shoaling and r e fraction have altered the waves in the surfzone The middle plot shows the wave angles at these locations Only onehalf of the longshore region is plotted as the wave height values are symmetric about Y = 0 while the wave angle values ar e anti symmetric The upper plot indicates that the greatest amount of shoaling occurs directly shoreward of the pit where the smallest initial waves coincide with an area of wave convergence Very little shoaling is found where the largest initial waves occur near Y = 200 m. It is apparent that as the wave height oscillates in the longshore direction th e re
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173 are regions of minimal shoaling followed by regions of significant shoaling that coincide in longshore location with areas of wave divergence and convergence respectively. ci 5 Q) 0 gi 5 <( 100 200 300 400 500 Y Distance (m) 10 (solid) Xp = 600 m start of slope co 600 3: (dash) Value at break i ng locat i on 15 ''''''' 0 100 200 300 400 500 600 Y Distance (m) Eo ~~~~~~~~~ i :6 ~: ____,_ / : ______L__ : ______L___ : ': ': ____j,_________: 1 100 0 100 200 300 400 500 600 700 X Position (m) Figure 644: Wa v e height and wave angle values at start of nearshore region and at breaking for longshore transect with bathymetry with H = 1 m and T = 12 s for Pit 1 The most significant refraction is shown to occur where the initial wave heights are the smallest which allows for the wave to propagate farther into the surf zone before depth limited breaking commences. In Figure 645 the wave heights in the nearshore region are shown in a contour plot with the breaking location indicated. This plot reveals the differences in the cross shore location of the breaking point which is a consequence of the nonuniform alongshore wave height shoreward of the pit. The waves with the smallest heights are
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174 seen to travel well into the nearshore region, while in the regions of wave focusing where the initial w ave heights are larger, breaking commences much farther offshore. 670 660 650 I 640 :;:; u 0 >< 630 620 610 0 100 200 300 Y Direction (m) 400 500 600 1.4 1 2 E 0 8 i 0) 'Qi I Q) 0 6 fii 0.4 0 2 0 Figure 645: Contour plot of wave height for Pit 1 in nearshore region with breaking location indicated with H = 1 m and T = 12 s. The initial and breaking values of the wave height and wave angle for Pit 2 are shown in Figure 646. The upper plot of the wave height shows considerably more wave shoaling than for the case of Pit 1. There are two reasons for the increased shoaling : the water depth in the region of uniform depth is greater for Pit 2 and initially the nearshore slope is smaller for Pit 2, both of which allow for greater shoaling to occur before wave breaking. As in Figure 644 for Pit 1, there are both regions of considerable wave shoaling and regions of minimal wave shoaling, which correspond to regions of wa v e convergence and divergence shown in the middle plot of the wave angles in the
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175 longshore. The wave angles at the start of the slope for the case of Pit 2 are shown to be much smaller than for Pit 1 due to Pit 2 lying in greater water depth and having a less abrupt change in depth, a result of the Gaussian transition slopes. Y Distance (m) ~4 ~~~~~r~ Cl Q) ~2 gi 0 <( a, 2 solid ) Xp = 600 m start of slope iu (dash ) Value at break i ng location ~4 '''= '.__ ___ _._ ___ _, 0 100 200 300 400 500 600 Y Distance (m) ~o ~~~~~~~~~ i :h : / : : : : : : : / 1 100 0 100 200 300 400 500 600 700 X Position (m) Figure 646: Wave height and wave angle values at start of nearshore region and at breaking for longshore transect with bathymetry with H = 1 m and T = 12 s for Pit 2 bathymetry. A contour plot of the wave height and breaking location for Pit 2 i s shown in Figure 64 7. The figure indicates that all of the waves shoal significant distances into the surf zone before breaking commences as compared to Figure 645 for Pit 1 The distance between locations of the first wave breaking and last wave to break is 26 m which can be compared to the 70 m difference for the case of Pit 1. The longshore gradient in the breaking wave height is shown to be much smaller than for the case of Pit 1.
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700 ~680 S C 0 t 660 0 >< 640 620 0 176 100 200 300 Y Direction (m) 400 500 600 1.2 1 1 E 0 9 1: Cl ai I 0 8 0 7 0 6 0 5 0 4 Figure 647: Contour plot of wave height for Pit 2 in nearshore region with breaking location indicated with H = 1 m and T = 12 s. 6.9 1 Comparison of Analytic Method to REF/DIF1 The 3D Step Model can be compared to the numerical model REF/DIF1 (Kirby and Dalrymple, 1994) as demonstrated in Section 6.5.1 for cases of a uniform depth domain containing a bathymetric anomaly. Comparisons can also be drawn for the Analytic SIR Model and REF/DIF1 for the domains shown in Figure 643 which mesh a uniform depth region containing a bathymetric anomaly to a sloped region representing the nearshore. For the comparisons the wave height and wave angle from each model were compared at the start of the slope representing the nearshore and at two locations in the nearshore re gi on for both Pit 1 and Pit 2 The REF/DIF1 modeling was performed using linear wave theory with no bottom dissipation and with crossshore and longshore spacing equal to 4 m. REF/DIF1
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177 uses the Dally et al. (1985) model for wave breaking which is based on the premise that there is a stable wave height within the surf zone for each water depth. The stable wave height is reached after the breaking threshold is met and breaking commences The wave height and wave angle values for the Analytic SIR Model and REF/DIF1 (linear) at the start of the nearshore region for Pit 1 are shown in Figure 648 The bottom plot shows the bathymetry for the two regions and the crossshore location for the wave heights and angles The upper plot indicates that the REF/DIF1 values nearly match the analytic values with a slight divergence at large longshore distances. The wave angles (middle plot) show good agreement with the REF/DIF1 results showing some scatter but with a trend that nearly matches the analytic results. E 1 5 ..., .c ~ 1 I Cl) > (sol i d) Analytic Model (N=1 OJ 0 5 (o) REF/DIF1 [linear dx=dy=4m] <11111~ ~J_ ___ L__ __ __[ __:__:: _..1_ _:__ _:__i___:_ __:__J 0 100 200 300 400 500 600 Y Distance (m ) Cl) gi 5 <( 1 O (so l id) Analytic Model [ N=1 OJ 15 (o) REF/DIF1 [ li near dx=dy=4m J ~~''''0 1 00 200 300 400 500 600 Y Distance (m) ~o r...~~s C :82 : .,,,, Cross Shore Transect Location _. \ .,."' ' = ~; co w4 '=L__,_ __ ,_ __ _1__ __ _1__ _ ...L,_ __ _j__ ____d 100 0 100 200 300 400 500 600 7 00 X Posit i on (m) Figure 648 : Wave height and wave angle values at start of nearshore region from 3D Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 1.
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178 The wave height and angle values for the Analytic SIR Model and REF/DIF1 at a location on the nearshore slope with a depth of 1 68 m (X = 616 m) are shown in Figure 649. As in the previous figure the crossshore location of the wave height and angle transects is indicated in the bottom plot. At this crossshore location, wave breaking has commenced for the largest waves as shown in the upper plot. In the Analytic SIR Model wave breaking is depth limited and after breaking the wave height is simply the breaking criterion (0 78) times the depth, while for REF/DIF1 the broken waves reach a stable wave height with a smaller breaking criterion. At the two longshore sections where breaking has occurred the Analytic SIR Model and REF/DIF1 show similar values for breaking height and breaking location. :[1.2 .E 1 Cl iii 08 I 0 6 (solid) Analytic Model [N=1 OJ 0 4~, (o) REF/DIF1 [linear dx=dy=4m] 0 2 '''''1.'' 0 1 00 200 300 400 500 600 Y Distance (m) 18 ~~~ Cl i 12 E o C ,g 2 rn a, 0 (sol i d) Analytic Model [N=10) 0 (o) REF/D I F1 [linear,dx=dy=4m] 100 200 300 400 500 600 Y Distance (m) : CrossShore Transect Location ~~ ; ,,,' ,'~ [iJ 4 ..___ _ ....... ~__J~ __J __ __J __ __J _ __J __ __j_ _ 100 0 100 200 300 400 500 600 700 X Position (m) Figure 649: Wave height and wave angle values at h = 1.68 m (X = 616 m) from 3D Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 1.
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179 The values for the unbroken waves show similar shoaled wave heights with more divergence between the models at large longshore distances. The wave angle values in the middle plot show good agreement between the models in the areas of unbroken waves with the REF/DIF1 results showing significant scatter in two sections of broken waves. The wave angle in the Analytic SIR Model is controlled by Snell's Law refraction throughout the nearshore region both before and after breaking. Figure 650 shows the wave height and angle for a longshore transect located farther into the surf zone (h = 1.44 m, X = 628 m), which induces widespread depth limited breaking is found. The lower plot shows the location of the crossshore transect in the nearshore region. 1 2 ,,,~~! 1 ..c io a I 0 6 (solid) Analytic Model [N=10) 0.4~~~ _.1.._ ___ ..L.._ ___ ...J...____..'.. (o::..'..)_R:=E ~ F/~D.::_IF_1~(~1in~e=a :..:_ r d:::i_x=~d~y= ~ ~ 4m ~)'.__ J 0 100 200 300 400 500 600 Y Distance (m) 20 ,,,~4'Cl 10 20 (solid) Analytic Model [N=1 OJ ~3 0 '.,__ ___ _,__ ___ _.__ (o_)_RE_F ID I ...L F _ 1_[1_in ea r _, d x= __[_ d_y= 4 m J _j 0 1 00 200 300 400 500 600 Y Distance (m) so ,.,,, , c CrossShore Transect Location ~ ~ ,,, 2 ~ '' ai w4 ''_.L._ __ .1...._ __ ..L.._ __ ..L.._ __ ...J..._ __ ....1..__ ~ 100 0 100 200 300 400 500 600 700 X Position (m) Figure 650: Wave height and wave angle values at h = 1.44 m (X = 628 m) from 3D Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 1
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180 The wave height values for the two models show good agreement for the breaking height and location in the longshore for this location with significant breaking The REF/DIF1 wave angle values show considerable scatter in the areas of wave breaking which is the majority of the transect, with the Analytic SIR Model wave angles generally following the trend of the scattered REF/DIF1 values. The Analytic SIR Model and REF/DIF1 were also compared for the case of Pit 2 for three crossshore locations (h = 3 m (slope start), h = 2.04 m, h = 1.6 m). Figure 651 shows the wave height and angle at the start of the nearshore region with the crossshore location indicated in the bottom plot. The wave height (upper plot) and wave angle (middle plot) values show good agreement with a slight divergence in the values that grows with longshore distance. I1.2 .... .c ~1 1 Q) I 1 Q) i0 9 0 8 0 ~5 Q) c, C <( Q) > 5 0 gO C 2 2 Ol > Q) [u 4 100 0 100 200 300 Y Distance (m) 100 200 300 Y Distance (m) (solid) Analytic Model [N=10) (o) REF/DIF1 [linear,dx=dy=4m] 400 500 600 (solid) Analytic Model [N=10) (o) REF/DIF1 [linear dx=dy=4m 400 500 600 ," CrossShore Transect Location ~ i .,.,,' __________________ [ ~,,,' 100 200 300 400 500 600 700 X Position (m) Figure 651 : Wave height and wave angle values at start of nearshore region from 3D Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 2.
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181 The wave height and wave angle shown in Figure 652 occur at a depth of2 04 m before breaking has been initiated at any longshore location. The upper plot shows the wave height values of the Analytic SIR Model with larger values in the peaks and smaller values in the troughs of the oscillations that occur in the longshore, as compared to the REF/DIF1 values, with the largest differences being less than 5%. The wave angles (middle plot) show similar magnitudes for the two models but with a phase shift of approximately 15 m E1 3 ~1 2 Q) I 1 1 Q) > 1 0 0 ]i 5 0) C <( Q) > 5 0 gO C :22 (1l > Q) [ij 4 100 0 100 200 100 200 (solid) Analytic Model [N=10] (o) REF/DIF1 [linear dx=dy=4m] 300 400 500 Y Distance (m) (solid) Analytic Model [N=1 OJ (o) REF/DIF1 [linear dx=dy=4m] 300 400 Y Distance (m) CrossShore Transect Location 500 ~.... ,, L .... 600 600 _____ __ _______ ...... .... 100 200 300 400 500 600 700 X Position (m) Figure 652 : Wave height and wave angle values at h = 2.04 m (X = 672 m) from 3D Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 2. The wave height and angle values at a crossshore location for Pit 2 with significant breaking are shown in Figure 653 The crossshore location is at X = 672 m (h = 1 6 m) and is indicated in the bottom plot. The wave height values in the upper plot
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182 show similar values for the breaking wave height and location for the two models with the Analytic SIR Model showing slightly larger values before breaking and generally smaller values in the nonbreaking waves. The REF/DIF1 values for the wave angles show large scatter for the broken waves with similar values for the nonbroken waves with the Analytic SIR Model. 11 2 :g,1.1 iii I 1 Q) > 10 0 0 0 0 100 200 300 400 500 600 Y Distance (m) gO C 22 1 ,. CrossShore Transect Location ____. j ,/ ...... Q) ill4 100 0 100 200 300 400 500 600 700 X Position (m) Figure 653: Wave height and wave angle values at h = 1.6 m (X = 704 m) from 3D Step Model and REF/DIF1 (linear) with H = 1 m and T = 12 s for Pit 2. Overall the Analytic SIR Model is found to agree quite well the results from REF/DIF1 for linear waves for the cases shown. The Analytic SIR Model will be used to determine the nearshore wave transformation needed for the shoreline change model of Section 6.10.
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183 6.9.2 Wave Averaged Results As was demonstrated in Section 6.7, averaging over several directions centered on a central value generates a more realistic incident wave climate and greatly reduces the longshore oscillations in the wave height and angle found using a single monochromatic incident wave. The weighted averaging technique described in Section 6.7 was used for the bathymetries of Pit 1 and Pit 2 with H = 1 m and T = 12 s to determine the breaking values for an averaged wave field. Figure 654 shows the wave height and angle values at the start of the nearshore region and at breaking for the case of Pit 1 with the bathymetry indicated in the bottom plot. The values of the wave height at breaking shown in the upper plot indicate fairly uniform shoaling for the entire transect with little longshore variation for the larger longshore distances; the desired consequence of the averaging procedure. The wave angle values show minimal refraction except for longshore distances less than 100 m. The magnitudes of the values and the variation in the longshore for the averaged values can be compared to those of Figure 644 for a normally incident wave The weighted average values of the wave height and angle at the start of the nearshore region and at breaking for Pit 2 are shown in Figure 655. The bathymetry for this case is detailed in the bottom plot. Significant shoaling is seen in the upper plot of the wave height, which also indicates minimal variation in the values for large longshore distances. The wave angles are small in magnitude with slight refraction occurring at most longshore locations. Using the weighted averaging technique these values can be compared for the bathymetry of Pit 2 in Figure 646 where the waves are normally incident.
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I1.2 t1 184 0 8 Weighted Average Angle (10 : 2 : 10] Gl (solid) Xp = 600 m start of slope 0 6 (dash) Value at break i ng location 3:0 4='~~~~15 & Cl < 0 Q) > 0 100 200 300 400 500 600 Y Distance (m) Weighted Average Angle [10 : 2 : 10 (solid) Xp = 600 m start of slope (dash) Value at breaking location "' 3: 5 ''''''~ 0 100 200 300 400 500 600 Y Distance (m) i:6: / : : : : : 1 100 0 100 200 300 400 500 600 700 X Position (m) Figure 654: Weighted wave averaged values of wave height and wave angle at start of nearshore region and at breaking for longshore transect with H = 1 m and T = 12 sand bathymetry for Pit 1. E .,.,~ :;:1 2 ;"'' .s::: ,, Cl .,, iii __ ,,,,_,.,..,,. I 1 (solid) Xp = 600 m start of slope "' Weighted Average Angle [10 : 2 : 10](dash) Value at breaking l ocation 3 o a ~~~~~~o 100 200 300 400 500 600 Y Distance (m) ~2 r,~,,,, Cl Q) &1 Q) 0) < 0 ~ ..... Q) > (solid) Xp = 600 m start of slope (dash) Value at breaking location 3 ''~'''' 0 100 200 300 400 500 600 Y Distance (m) 1: L. w 46,/ : : : : : : : i 100 0 100 200 300 400 500 600 700 X Position (m) Figure 655: Weighted wave averaged values of wave height and wave angle at start of nearshore region and at breaking for longshore transect with H = 1 m and T = 12 sand bathymetry for Pit 2
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185 To make sure that the weighted average method was valid with the Analytic SIR Model a study of when to implement the averaging procedure was made. The first procedure ran the 3D Step Model for 11 wave directions from 10 deg to 10 deg every 2 deg and obtained the results at a transect representing the start of the nearshore zone. Next, the weighted averaging technique was used to determine the averaged values, which were then used in the Analytic SIR Model. The other procedure ran the Analytic SIR Model 11 different times, one for each incident wave direction. Then the weighted averaging technique was employed on the shoaled and refracted values for each wave direction to determine the averaged values. Little difference was found in the values obtained by the two procedures with the wave height values almost equal and only small differences for the wave angles. From this comparison it was determined that only shoaling the weighted average values was sufficient. 6.10 Shoreline Evolution Model Up to this point only the wave field modification caused by bathymetric anomalies has been demonstrated. The development of the Analytic SIR Model extends the bathymetry altered wave field into the nearshore region where shoaling and refraction induced by the sloping bottom modify the waves until depth limited breaking occurs. In order to calculate the shoreline planform evolution shoreward of a bathymetric anomaly the Analytic SIR Model is employed to calculate the breaking wave height and angle as well as the breaking location, which are then used to drive the longshore transport and, with the continuity equation, the change in shoreline position. Details of the Shoreline Evolution Model can be found in Appendix D. The Shoreline Evolution Model provides a means to determine the shoreline evolution near an axisymmetric bathymetric anomaly
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186 lying in uniform depth, which has gradual transitions in depth, and a nearshore region that may be defined with a linear slope or an Equilibrium Beach Profile (EBP) form. 6 10.1 Shoreline Change Estimates Shoreward of Bathymetric Anomalies The Shoreline Evolution Model was used with several domains containing different bathymetric anomaly shapes, as well as nearshore forms, in an attempt to develop the equilibrium planform for a variety of conditions. The base conditions for the modeling were an incident wave height and period of 1 m and 12 s, respectively with the first longshore transport term, K 1 equal to 0.77. The time step was 50 seconds with 12600 time steps, for a total modeling time of 175 hours (7.3 days) The boundary conditions for the model were closed boundarys (longshore transport, Q, equal to 0) at Yp = +/800 m. The weighted averaging procedure described in Section 6. 7 was used on the initial wave height and angle values determined by the 3D Step Model. The shoreline evolution for the case of Pit 1 is shown in Figure 656 with K 2 = 0.4 with the bathymetry shown in inset diagram. The weighted average wave height and angles used as the initial values at the offshore limit of the nearshore region are found in Figure 654. The shoreline planforms are plotted every 4 hours for the first 16 hours and thereafter every 12 hours. The initial shoreline position is indicated by the dotted line and the final shoreline position is indicated with "o" for every third longshore point. Accretion (shoreline advancement) is in the negative X direction. The shoreline plot indicates a large salient forming directly shoreward of the pit, which is bordered by two areas of erosion with the crossshore extent of the shoreline advancement approximately twice that of the shoreline retreat. Some areas of interest are directly shoreward of the pit (Yp +/50 m) where the shape of the planform changes concavity as the shoreline evolves, and the oscillations in the longshore at Yp > +/250 m where the shoreline
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187 advances at first and then retreats as material leaves the area. The system is seen to approach equilibrium as the change in the shoreline position with each 12 hour step is seen to decrease dramatically. 700 I Q) Accretion u C 695 0 (/) 0 X .s 1 690 C Time Step (dt) = 50 sec _g 2 ____, (ll > From Initial Shoreline (dash) Q) w 3 685 1 st 4 every 4 hours Then every 12 hours 4 Final shoreline (o) 200 I I , I '' 0 200 400 600 X Position (m) 680 ~~~~~~~~~ 800 600 400 200 0 200 400 600 800 Y Distance (m) Figure 656: Shoreline evolution for case Pit 1 with K 1 = 0. 77 and K 2 = 0.4 for incident wave height of 1 m, wave period of 12 s, and time step of 50 s with shoreline advancement in the negative X direction; Pit 1 bathymetry along crossshore transect included. Studying the longshore transport terms (K 1 and K 2 ) individually allows investigation of the mechanics of the shoreline evolution. Figure 657 shows the shoreline position, longshore transport (Q), breaking wave height, and breaking wave angle within subplots to isolate their behavior after one time step for the model shown in the previous figure. Only onehalf of the domain is shown as the results are either symmetric (shoreline position, wave height) or antisymmetric (wave angle, Q) about Yp
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188 = 0 The upper plot shows the shoreline position versus longshore distance with accretion indicated shoreward of the pit flanked by an area of erosion and then shoreline advancement. The second plot shows the longshore transport, which causes the change in the shoreline position with the total transport (K. 1 & K 2 ) transport driven by the breaking wave angle (K. 1 ) and transport driven by the gradient in the breaking wave height (K 2 ) plotted separately The K 2 transport term is seen to dominate the total transport in most areas with few regions where the terms reinforce. Regions where the gradient in the longshore transport is negative (0 < Yp < l30 m) are shown to correspond to regions of shoreline advancement with shoreline retreat for a positive gradient in transport. t:.~ .___t ~ .____.__: ~ .____.____.______,0 50 100 150 200 250 300 0 1 ,,,,=::::;;;;;;;;;;= :r==~KtK2 t : : ::=::::~~: ~ '_ .. ,_ .... .... _, .. ,_ .... ... L._ ... .... .... ,. :.: L._~ ~ . _ .. _ L._ _ ~~.. ~ ~ ' : 0 50 100 150 200 250 300 1 5 ~~~~ ~::::::::::.::::: ::::0 1 :[ 1 l = ~+ i I.00 5= ~' _______J___ ..... ,: 0 1 ON 0 50 100 150 200 250 300 5 ~~0) __ ...... ....... 0 05 Q) ,, 0 025,,,:? ...... .... .oO ro ..c a. .. .. 0 '....... < 5 ~ ___ .,___ ___ .,___ ___ .,___ ___ .,___ ___ .1_.C::..::...._ ____; .. .... _,, 0.025 0 50 100 150 200 250 300 Y D i stance (m) Figure 657: Pa r ameters for shoreline change after 1 s t time step showing shoreline position, and longshore transport terms for case Pit 1 with K 1 = 0. 77 and K 2 = 0 .s a
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189 The third plot shows the relationship between the breaking wave height and the K2 driven transport (Q 2 ) with the left axis and solid line indicating Hb and the right axis and dotted line indicating Q 2 A positive gradient in Hb is shown to cause negative transport, which is intuitive as a gradient in Hb will cause a flow from the section with the larger wave height to the smaller wave height. The bottom plot shows the breaking wave angle ( ab) and the longshore transport driven by the angle (Q 1 ) with the transport having the same form as the wave angle The effect of the second transport coefficient, K 2 on the equilibrium planform is shown in Figure 658 for the case of Pit 1 with K 1 = 0.77. Only onehalf of the domain is plotted as the results are symmetric about Yp = 0. 720 ~~~~~~~~~~ 710 700 I Accretion Q) 0 u 690 t, ]:1 i:5 >< C: 15 2 680 "' > OJ 3 K 1 = 0 77 4 670 T i me Step (dt)=50 sec 200 12600 Time Steps (175 hour model) 660 0 100 200 300 400 Y Distance (m) 0 500 Initial Position ___ K 2 =0 ......... K 2 = 0.2 K 2 = 0.4 ___ K 2 = 0 77 I I I I I I I I 200 400 600 X Position (m) 600 700 800 Figure 658 : Final shoreline planform for case Pit 1 with K 1 = 0.77 and K 2 = 0, 0.2, 0.4, and 0.77 for incident wave height of 1 m and T = 12 s, with shoreline advancement in the negative X direction ; Pit 1 bathymetry along crossshore transect included.
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190 The final shoreline planforms are plotted for four different K2 values: K2 = 0 indicating only wave angle driven transport, the base condition ofK2 = 0.4, K2 = 0.77 taken as the upper limit for effect of the longshore gradient in the breaking wave height, and K 2 = 0.2 The final shoreline planform is shown to vary greatly with the value of K 2 The shoreline advance that occurs directly shoreward of the pit (Yp = 0) ranges from appro x imately 2 m for K 2 = 0 to 36 m for K 2 = 0.77 All of the equilibrium planforms are shown to pass through a point at Yp = 110 m with the value ofK 2 determining the magnitude of the shoreline advancement and retreat. Plotting the change in shoreline position versus time indicates approach of the system to an equilibrium planform. Figure 659 shows the change in shoreline position with modeling time for 4 longshore locations for the case of Pit 1 with K 1 = 0 77 and K 2 = 0.4 and the bathymetry indicated in the inset diagram The longshore locations were directly behind the pit (Yp = 0) and then every 100 m out to 300 m. At all four longshore locations the change in shoreline position with time is seen to approach 0 for the larger modeling times For Yp = 0 m the change in shoreline position with time indicates accretion (negati v e X) at an increasing rate up to 23 hours and then at a rate that decrease asymptotically towards 0. For the transects located at 100 and 300 m the shoreline first advances greatly and then retreats at a diminishing rate, while at Yp = 200 m the shoreline retreats monotonically at a decreasing rate. The assumption of small changes in the wave height and angle in the crossshore at the beginning of the nearshore zone is contained in the Shoreline Evolution Model. This allows the same initial wave height and wave angle values to be used ev e n as the shoreline translates onshore or offshore. To check the assumption of small changes in the
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191 crossshore a comparison was made of the wave height and angle at the start of the nearshore zone for the case of Pitl and at locations +/ 20 m from the start of the nearshore zone (Figure 660). The bottom plot indicates the bathymetry for Pit 1 and the locations of the two transects for 600 m +/ 20 m. The top plot shows the wave height at the three crossshore locations with little variation indicated The middle plot shows the wave angle values with longshore distance for the 3 locations with differences from the value at Xp = 600 m less than 0.5 degrees at all locations These results indicate that the assumption of small crossshore variations in the wave height and wave angle where the uniform depth region joins the nearshore region is valid 2 0 40 o ~ ~ I C ,22e, Ill 5i w I I I I .'' 4 ~ ~ '~~.....__, 200 0 200 400 600 X Pos i tion (m) 60 80 100 120 140 1 60 Modeling Time (hr) Figure 659: Change in shoreline position with modeling time at 4 longshore locations (Yp = 0, 100 200 300 m) for case Pit 1 with K 1 = 0.77 and K 2 = 0.4 with shoreline advancement in the negative X direction; Pit 1 bathymetry along crossshore transect included.
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:[ 1 2 1: 1 Cl i0 8 0 6 (11 192 Xp=600m Xp = 580 m ......... Xp = 620 m 0 41!!!:!~~ =._.i_ ___ _L_ ___ ,L__ __ ____L __ _L_ __ __J 0 50 100 150 200 250 300 ~5 r..,.,, Cl Q) Q) gi 0 <( Q) iu Xp= 600m Xp = 580 m ,........ Xp = 620 m 5 L'~ ~~ ~o 50 100 150 200 250 300 Y Distance (m) i::6 / : : : : : i l 100 0 100 200 300 400 500 600 700 X Pos i tion (m) Figure 660: Comparison of wave height and wave angle values at 600 m and 600 m +/20 m for case of Pit 1 for T = 12 s with bathymetry and transect locations indicated in bottom plot. The final shoreline planforms for the case of Pit 2 are shown in Figure 661 for 4 values ofK 2 (0 0 2 0.4, 0.77) with the bathymetry indicated in the inset diagram. The nearshore region for this case is an Equilibrium Beach Profile form with coefficient A" equal to 0.1 m 1 1 3 corresponding to a sediment diameter of 0.1 mm. The weighted average wave height and angles used as the initial values at the start of the nearshore region are found in Figure 655. The final shoreline planform is found to vary greatly with K 2 as for the case of Pit 1; however, there are some differences between the two cases For K 2 = 0 the shoreline is found to retreat directly shoreward of the pit, due to the divergence of the wave field This result indicates that depending on whether the gradient in the breaking wave height term is included or what value it is assigned the shoreline response directly landward of the pit can change from erosion to accretion or vice versa. Due to
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193 the smaller breaking wave angles and breaking wave height gradients, the magnitude of the shoreline changes are smaller than for the case of Pit 1; this provides many more locations where all 4 final planforms pass through the same point with the K 2 value determining the crossshore extent of the deflections. 772 770 768 766 I 764 C m .... f/) o 762 X 760 Accretion 758 i 756 0 100 200 T i me Step (dt)=50 sec 12600 Time Steps (175 hour mode l) 0 :[ 1 C 22 m > 3 w 4 0 200 In i tia l Posit i on fS= O ,........ K 2 = 0 2 fS=0 4 ___ K 2 = 0 77 I I I I , , 400 600 X Posit i on (m ) 300 400 500 600 700 Y Distance (m) 800 Figure 661: Final shoreline planform for case Pit 2 with K 1 = 0. 77 and K 2 = 0 0.2 0.4 and 0.77 for inc i dent wave height of 1 m, wave period of 12 s, and time step of 50 s with shoreline advancement in the negative X direction ; Pit 2 bathymetry along crossshore transect included The shoreline evolution for the case of Pit 2 with K 1 and K 2 equal to 0 77 and 0 respectively is shown in Figure 662. The shoreline planforms are plotted every 4 hours for the first 16 hours and then every 12 hours with the initial shoreline position indicated by the dotted line and the final shoreline position is indicated with o for every third longshore point. The plot indicates that directly shoreward of the pit the shoreline
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194 advances initially and then retreats at a decreasing rate. Inspecting the final shoreline position at the two regions of maximum advancement reveals that the shoreline advances to a point and then retreats as the planform must compensate for the large region of erosion shoreward of the pit. 765 5 ~~~....,, K 1 = 0 77 K 2 = 0 765 Time Step (dt) = 50 sec 764 5 764 763 5 763 From In i tial Shoreline (dash) 1 st 4 every 4 hours Then every 12 hours Fina l shoreline (o) I I I I I / _____ 0 200 400 600 X Posit i on (m) 762 5 ~~ ~~~~~~~ 800 600 400 200 0 200 400 600 800 Figure 662: Shoreline evolution for case Pit 2 with K 1 = 0.77 and K 2 = 0 for incident wave height of 1 m, wave period of 12 s, and time step of 50 s with shoreline advancement in the negative X direction ; Pit 2 bathymetry along crossshore transect included. The chan g e of the shoreline planform with time for Pit 2 with K 1 = 0.77 and K 2 equal to 0 can be viewed in Figure 663 at longshore distances of 0 100 200 and 300 m. At Yp = 0 the large initial shoreline advancement followed by the gradual decrease in the retreat is indicated while at Yp = 100 m only erosion occurs. For Yp = 200 m (region of maximum advancement) the shoreline is shown to advance and then retreat very gradually. The complex nature of reorganization of the sediment in response to the
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195 forcing of the w av es is highlighted at Yp = 300 m where a large initial shorel i ne advance is followed by a gradual shoreline retreat, which at a modeling time of 500 hours, the shoreline starts to advance at a very small rate 3 I a. 2 2 (/) < C: 3 w , I I I I _______ / 4 "' ,..__ ~~~' 0 200 400 600 X Position (m ) .. ___________ ____________________________ . .. .. ,.. ~ .. ~.~~:~:~~ "'''''=:::::; ::::":: ~'~,'~~::~;:;;~...: , ,. , Yp = 0 .. _.. .. Yp = 100 m / /' ......... Yp = 200 m ; /~ , Yp = 300 m \ ~ ... ,( 2 ~~~~~~~~~ 0 100 200 300 400 500 600 7 00 Modeling Time (hr) Figure 663 : Change in shoreline position with modeling time at 4 longshore locations (Yp = 0, 100 200,300 m) for case Pit 2 with K 1 = 0 77 and K 2 = 0 with shoreline advancement in the negative X direction; Pit 2 bathymetry along crossshore transect included. The equilibrium shoreline planform for the case Shoal 1 for K 2 equal to 0 0.2, 0.4 and 0.77 is shown in Figure 664 for K 1 = 0.77. The bathymetry for the case of Shoal 1 is shown in the inset diagram. The equilibrium planforms show two cases of erosion occurring directl y shoreward of the shoal (K 2 = 0.4 0. 77) and two cases of accretion occurring (K 2 = 0.2 0) For this case the wave angles converge directly shoreward of the shoal a result of the refraction and diffraction caused by the anomaly, thus causing the K1 term when taken individually to create a salient. With K 2 equal to 0.2 the gradient in
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196 the wave height term which is negative directly shoreward of the shoal is not strong enough to overcome the wave angle term but with K 2 = 0.4 the gradient in the breaking wave height overcomes the breaking wave angle term and erosion occurs directly shoreward of th e shoal. 910 905 E ~900 u C: 19 V) 0 >< 895 890 Accretion K 1 = 0 .77 Time Step (dt)=50 se 12600 Time Steps (175 hour mode l) 0 I C: :8 2 (ll > Q) [iJ 4 0 200 In i t i a l Pos i t i on K = 0 2 ......... K 2 = 0 2 K 2 = 0.4 ___ K 2 = 0 77 I I I I I I I I I I I I 400 600 800 X Position (m ) 885 ''''__._ __ ___. __ 0 100 200 300 400 500 600 7 00 Y Distance (m) 800 Figure 664 : Final shoreline planform for case Shoal 1 with K 1 = 0.77 and K 2 = 0 0.2 0.4 and 0. 77 for incident wave height of 1 m wave period of 12 s and time step of 50 s with shoreline ad v ancement in the negative X direction ; Shoal 1 bathyrnetry along cross shore transect included. The shoreline evolution for the case ofK 1 = 0.77 and K 2 = 0.2 with Shoal 1 is shown in Figure 665 For this plot the shoreline position is shown at 4 hour intervals for the first 16 hours by dotted lines with the shoreline position every 12 hours after that indicated by solid lines The initial shoreline position is plotted as a dashed line The shorelines indicat e that an area of erosion occurs directly shoreward of the shoal in the first 20 hours After 20 hours the shoreline starts to advance and at 90 hours the shoreline
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197 crosses the initial location and advances 0 5 m before reaching an equilibrium position. The other areas of significant shoreline movement all either only advance or only retreat. 904 ~~ ~~~~~~~ 903 902 901 E Q) 0 290 V) 0 X 899 K 1 = 0 77 K 2 = 0 2 898 Time Step (dt) = 50 sec From Initial Shoreline (dash) 897 1 st 4 every 4 hours Then every 12 hours Final shoreline (o) 0 ~ E f C I 22 : ca ai : w : 41!!....!,,,==,!_J 100 400 900 Accretion 896 ~~~~~~~~~ 800 600 400 2 00 0 200 400 600 800 Y Distance (m) Figure 665: Shoreline evolution for case Shoal 1 with K 1 = 0. 77 and K 2 = 0.2 for incident wave height of 1 m, wave period of 12 s, and time step of 50 s with shoreline advancement in the negative X direction; Shoal 1 bathymetry along crossshore transect included. 6.10.2 Effect ofNearshore Form on Shoreline Change The effect of the nearshore form (linear slope or Equilibrium Beach Profile) on the shoreline evolution was investigated using the cases of Pit 1 and Shoal 1. Pit 1 (nearshore 1) has linear transitions in depth and a nearshore region with a linear slope of 0 2, resulting in a crossshore extent of 100 m Pit 1 (nearshore 2) was characterized by an EBP form that fit the depth and crossshore distance constraints of case Pit 1 (nearshore 1 ), which require a coefficient "A" value of 0 0928 m 1 1 3 corresponding to a sediment diameter of 0.08 mm. Figure 666 shows the final equilibrium shoreline
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198 position for the cases of Pit 1 with the two nearshore forms for two different values of K 2 with the bathymetry for the two cases indicated in the bottom plot. The upper plot shows the final shoreline position for K 1 and K 2 equal to 0. 77 and 0 respectively with the equilibrium planforms shown to be almost identical. The middle plot is for K 1 and K2 equal to 0.77 and shows that case Pit 1 (nearshore 1) results in more shoreline advancement directly shoreward of the pit and more erosion in the bordering areas ; however the differences are relatively small. With K 2 = 0 indicating no difference in the planforms and K 2 = 0 77 showing a divergence in the final planforms, suggests that the change in the shoaling of the waves over the two nearshore forms is more pronounced than the variation in the wave refraction 704 ,.~~r,;:;::,r ,,~_ _~__ _~___ '~_7 :[ K 1 = 0. 77 linear nearshore slope 702 K 2 = 0 o EBP form C ~ 700 0 X 698 L.__''''''_j_.J....___J_ ___JL___ _J 0 50 100 150 200 250 300 350 400 450 500 E 720 ,,,=::;'i~~~:,,, ,.7 1 :: 7 ~=~ii _______ X .. 660 ___ .. linear nearshore slope o EBP form 0 50 100 150 200 250 300 350 400 450 500 Y Distance (m) 0 .,,,~~~~5 linear slope ....__ /. ~ c Pit 1 ,"~:(.~ 2 \ EBP w_4 '=_ ......,....,,.L___ _L_ __ .J...._ __ ..L__ __ _L_ __ ..L_ __ ...J..._ ____.d 100 0 100 200 300 400 500 600 700 X Position (m) Figure 666: Final shoreline planform for case Pit 1 with linear nearshore slope and EBP form for T = 12 sand with K 1 = 0.77 and K 2 = 0 and 0.77 with shoreline advancement in the negative X direction; Pit 1 and Pit 1 b bathymetry along crossshore transect included.
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199 The case of Shoal 1 was also used to investigate the impact of the nearshore form Figure 667 shows the final shoreline planform for Shoal 1 with a linear nearshore slope and with an EBP form with K 1 = 0.77 and K 2 = 0 and 0.77 in the top and middle plots, respectively. 0 50 1 00 150 200 250 300 350 400 450 500 K 1 = 0 77 ,_.,., .. .. ...... K 2 =0 77 . "' ~)n,.,,,,ri\Y. linear nearshore slope / ......... __ ,.,., o EBP form 0 50 100 150 200 250 300 350 400 450 500 Y Distance (m) o .~~~~~,,, S C 2 ai Shoal 1 / l i near slope ,'/ ,, /:/ t .,. ,,., [iJ 4 lee= ~_j_ ___!e,="'"""""""""" ...... """""""""""""""""="""""""""'""""""""""""""'""""""" ,.,~, EBP 100 0 100 200 300 400 500 600 700 800 900 X Posit i on (m) Figure 667: Final shoreline planform for case Shoal 1 (linear nearshore slope) and Shoal lb (Equilibrium Beach Profile) for T = 12 sand with K 1 = 0.77 and K 2 = 0 and 0.77 with shoreline advancement in the negative X direction; Shoal 1 and Shoal 1 b bathymetry along crossshore transect included. The bathymetry for the two nearshore forms is shown in the bottom plot. The EBP form has an A value of 0 117 m 1 1 3 for the Equilibrium Beach Profile coefficient which provides an equ iv alent nearshore distance to Shoal 1. The case ofK 2 = 0 shows that both bathymetries pro v ide similar final shoreline planforms. The middle plot with K 2 = 0.77 indicates that Shoal 1 with a linear nearshore slope leads to a larger shoreline change with more erosion directly shoreward of the shoal and more accretion in the first salient in the
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200 longshore direction. The case of a linear nearshore slope was also found to produce larger shoreline change for the case of Pit 1 in Figure 666. 6.10.3 Investigation of Boundary Conditions In Appendix D two different boundary conditions at the longshore extent of the domain are discussed: no longshore transport (Boundary Condition 1) and fixed cross shore location (Boundary Condition 2). All of the prior shoreline change results have used the no longshore transport boundary condition. Neither boundary condition fully depicts a natural shoreline where transport can occur and the crossshore location is not fixed However for domains with large longshore extents the impact of the pit near the end of the domain should be minimal and little shoreline effects should be expected, thereby reducing the influence of the boundary condition that is used .. Figure 668 shows the final shoreline planform for the case of Pit 1 for K 1 = 0.77 and K 2 = 0.4 for both boundary conditions. The average shoreline position for the entire domain is included on the plot to quantify the gain or loss of sediment from the system For the no longshore transport boundary condition (Boundary Condition 1) a closed system is requisite, and the average shoreline position should equal the starting position, a result not expected for the fixed crossshore location condition, which allows sediment flow at the longshore limits of the domain. As expected, the plot indicates that the final shoreline planform for longshore distances less than mare not very sensitive to the boundary condition. At larger longshore distances, Boundary Condition 2 is shown to result in an average shoreline position of 700.62 m, which is greater than the initial shoreline position of 700 m, indicating a net loss of sediment from the system. Assuming that the nearshore zone is translated in the crossshore direction, this equates to a net
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201 sediment loss of 3968 m 3 (0.62 m 1600 m 4 m) from the system. Boundary Condition 1 leads to a build up of sediment at the longshore ends of the domain with the average shoreline position of 700.03 m indicating no significant loss of sediment from the system I Q) 0 C 710 705 700 695 0 >< 690 685 Accretion Boundary Condition 1 No longshore transport Xp = 700 03 m avg Boundary Condition 2 Fixed crossshore location Xp = 700 62 m avg E C o~~ I I I I 2 e,' ai w 200 0 200 400 600 X Position (m) 680 ~~~~~~~~~ 800 600 400 200 0 200 400 600 800 Y Distance (m) Figure 668: Final shoreline planform for case Pit 1 for T = 12 sand with K 1 = 0.77 and K 2 = 0.4 for two boundary conditions with shoreline advancement in the negative X direction; Pit 1 bathymetry along crossshore transect included. The case of Shoal 1 was also used to demonstrate the impact of the boundary condition on the shoreline evolution. Figure 669 shows the final shoreline position for the case of Shoal 1 with K 1 = 0. 77 and K 2 = 0.4 for both boundary conditions. For this case no significant difference is indicated between the final shoreline positions for the two boundary conditions except at large longshore distances. Boundary Condition 2 (fixed crossshore location) is shown to result in a net gain of the sediment to the system with the average shoreline position of 899.81 m, which is less than the initial location.
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202 For Boundary Condition 1 (no longshore transport) no significant amount of sediment is lost from the system. 910 905 895 890 800 ti Accretion 600 400 200 0 200 Y Distance (m) 0.. ,S I I C I _g 2 : CU I > I Q) I W I .41!..!,,""""""""",;_' _J 100 Boundary Cond i t i on 1 Xp = 899 98 m avg Boundary Condition 2 Xp = 899 81 m avg 400 600 800 Figure 669: Final shoreline planform for case Shoal 1 for T = 12 sand with K 1 = 0.77 and K 2 = 0.77 for two boundary conditions with shoreline advancement in the negative X direction ; Shoal 1 bathymetry along crossshore transect included 6 10.4 Investigation of Transition Slope on Shoreline Evolution The effect of the transition slope on the wave transformation and energy reflection has been investigated previously using the constant volume pits first shown in Figure 69 Using the same constant volume constant depth pits in the form of truncated cones (slope = abrupt, 1 0.2 0.07) the effect of the transition slope on the shoreline evolution was studied The incident wave conditions were averaged over direction using the weighted averaged procedure discussed in Section 6.7
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203 The Shoreline Evolution Model was run for the base conditions described in Section 6.10.1 with the longshore boundaries at m. The shoreline was located 500 m from the center of the pits, with a nearshore slope of 0 2. The final shoreline planforms for the 4 pits of constant volume with K1 and K2 equal to 0 77 and 0 respectively are shown in Figure 670 for half of the domain. An inset plot is included to show the bathymetry for the 4 slopes with the line type corresponding to the slope value on the main plot. 502 ~~~,,~, 501 5 501 :[ 500 5 C ffi 0 >< 500 499.5 499 0 Accretion 100 ~=0 T= 12 s abrupt s = 1 ... ..... s = 0 2 s = 0 07 C 2 3 (ll 6i w 3 5 1 . "' '.; , i :,~ i 4 .__.__ __ ~' : I ;;,, 30 20 10 0 R value (m) 200 300 400 500 600 Y Distance (m) Figure 670 : Final shoreline planform for constant volume pits for T = 12 s and with K 1 = 0. 77 and K 2 = 0 with shoreline advancement in the negative X direction; crosssection of pit bathymetries through centerline included with slopes of abrupt 1 0.2 0.07. The pit with the most gradual transition slope is shown to cause the largest shoreline retreat directly shoreward of the pit for this case bordered by the largest shoreline advancement. Generally the more gradual the slope the larger the shoreline
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204 displacement. For this case with K 2 = 0 the longshore transport direction will be driven by the wave angle only and the more gradual transition slopes resulted in greater refraction and larger modification to the wave angles shoreward of the bathymetric anomaly. Due to the noflow boundary condition a build up of sediment is found at the larger longshore distances of the domain. This area of shoreline advancement must occur to balance the large area of shoreline retreat directly shoreward of the pits with the continuity principle confirmed by the average shoreline position. The Shoreline Evolution Model was also employed with K 2 = 0.4 for the constant volume pits. To compare the magnitude of the shoreline response with K2 equal to 0 and 0.4, the final planforms for both values are shown in Figure 671. With K2 = 0.4 all four pit configurations are shown to result in shoreline advancement directly shoreward of the pits with the advancement increasing for more gradual transition slopes. This is another demonstration of the significance of the transport coefficients on the shoreline response with either shoreline advancement or retreat possible depending on the magnitude of the coefficients. The impact of the wave period on the shoreline response was also investigated for the same depth pits. The final shoreline planform for 5 periods (8, 10, 12, 14, 16 s) for the constant volume pit with a transition slope of 0.2 is shown in Figure 672 for K 2 = 0. A period of 10 s is shown to produce the largest shoreline displacement, with a shoreline retreat of 1.8 m. The largest shoreline advancement occurs for a period of 16 s, the period with the smallest shoreline retreat. This is due to the final planform for a period of 16 s having a wider area of erosion, which forces the area of accretion to be larger, resulting in the largest shoreline advancement.
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205 504 T = 12 s .. ~ ;L 1 5 i_t Accretion :8 3 "' a'.; 3 5 i~ I j w. :': ._'! 4 L_ ~I= ::: == = :=1 :. ~ = 30 20 10 0 _, R value (m) 494L_ ___ .1...,_ ___ .J...._ ___ _,__ ___ ..J..._ ___ _L_ ___ _, 0 100 200 300 400 500 600 Y Distance (m) Figure 671: Final shoreline planform for constant volume pits for T = 12 sand with K1 = 0. 77 and K 2 = 0 and 0.4 with shoreline advancement in the negative X direction; cross section of pit bathymetries through centerline included with slopes of abrupt 1, 0 .2, 0.07 502 ~~~~;:::=:::r========r=======.~ 501.5 501 I 500 5 C i'.5 X 500 499 5 499 0 T=8s T = 10 s ......... T=12s T = 14 s T= 16 s 100 200 1 .25 C _g 3 "' ai [ij _3 5 4 ~~ 20 10 R value (m) 300 400 500 600 Y Distance (m) Figure 672: Final shoreline planform for 5 periods for constant volume pits with K 1 = 0. 77 and K 2 = 0 with shoreline advancement in the negative X direction; crosssection of pit bathymetry through centerline included with slope 0.2.
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206 The magnitude of the maximum shoreline advancement and shoreline retreat are plotted for the 4 pit bathymetries shown in the inset diagram and periods of 8, 10, 12, 14, 16 seconds with K 2 = 0 in Figure 673. For K2 = 0 the maximum shoreline retreat occurs shoreward of the pits with the locations of maximum advancement bordering this area, as shown in Figure 670 for T = 12 s. A period of 10 s is shown to produce the largest shoreline displacement (2 m) with the most gradual transition slope producing the largest displacement for each period. 1 2 r;::::::====ir.,,,i abrupt _,._ s = 1 .. + .. s = 0 2 :: ::~ ~ ::: ;:;;;_::: ::: : : :::: :: ::: :: :::::::: :: :::::::: :::. ~~= : : _ ..., _ ... 2 ''''"= ~==...... _'~~''~ Q) ~E ~:::1 .C C (J) Q) 8 9 10 11 12 13 Period (sec) E E Q) 0 8 ::, () EC (IJ <( 14 15 16 20 0 0 4 ~~~~~~ __ R v ~ ue ~ m ~~ 8 9 10 11 12 Period (sec) 13 14 15 16 Figure 673: Maximum shoreline advancement and retreat versus period for constant volume pits with K 1 = 0.77 and K 2 = 0; crosssection of pit bathymetries through centerline included with slopes of abrupt, 1, 0.2, 0 07 The maximum shoreline advancement values show that a period of 16 s produces the largest shoreline advancement with a transition slope of 0.07 producing the largest values. Figure 674 plots the magnitude of the maximum shoreline advancement and retreat for the 4 constant volume pit bathymetries shown in the inset diagram with K 2 =
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207 0.4. With K 2 = 0.4 a period of 8 seconds results in the largest shoreline advancement and retreat. A transition slope of 0.07 is shown to produce the largest shoreline displacements for each period. 8 9 10 11 12 Period (sec) 13 14 15 16 20 0 R value (m) .. .. .. :":' .. ,, .. ,:':';,::,,.,,., 2 ~~~ ~~~ ~ '' 8 9 10 11 12 Period (sec) 13 14 15 16 Figure 674: Maximum shoreline advancement and retreat versus period for constant volume pits with K1 = 0. 77 and K2 = 0.4; crosssection of pit bathymetries through centerline included with slopes of abrupt, 1, 0.2, 0.07.
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CHAPTER 7 CONCLUSIONS AND DIRECTIONS FOR FUTURE STUDY 7 1 Conclusions Recent interest in extracting large volumes of nearshore sediment for beach nourishment and construction purposes has increased the need for reliable predictions of the wave transformation and associated shoreline changes caused by the resulting bathyrnetric anomalies This predictive capacity would assist the designer of such projects in minimizing undesirable shoreline changes. The available laboratory and field data suggest that the effect of wave transformation by an offshore pit can result in substantial shoreward salients. Of the four wave transformation processes caused by a bathyrnetric anomaly, a significant number of wave models include only the effects of wave refraction and diffraction with few models incorporating wave reflection and/or dissipation over a soft medium in the pit. Computational results incorporating only refraction and diffraction and accepted values of sediment transport coefficients appear incapable of predicting the observed salient landward of borrow pits Therefore, improved capabilities to predict wave transformation and shoreline response to constructed borrow pits will require improvements in both: (1) wave modeling particularly in representing wave reflection and dissipation and (2 ) longshore sediment transport particularly by the breaking wave angle and wa v e height gradient terms 208
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209 The interaction of linear water waves with twodimensional trenches and shoals has been demonstrated using three methods (2D Analytic Step Method, Analytic Slope Method, Numerical Method) for both symmetric and asymmetric anomalies. The three methods show good agreement for the cases presented for various bathymetric anomalies with abrupt and gradual transitions between changes in depth. The numerical model FUNW AVE 1.0 [1D] compares reasonably well with the 2D Analytic Step Model, with better agreement as the linearity of the waves increases. Gradual transitions in the depth for both symmetric and asymmetric bathymetric changes are seen to reduce the reflection coefficients, especially for nonshallow water waves Linear transitions are shown to result in instances of complete wave transmission for symmetric trenches and shoals, while for asymmetric trenches and shoals complete transmission does not occur other than for the trivial solution (k 1 h 1 =0) Changes in depth that are Gaussian in form are demonstrated to result in a single peak of the reflection coefficient in the long wave region, followed by minimal reflection for shorter wavelengths. Several new results for 2D domains have been demonstrated in this study: (1) The wave field modifications are shown to be independent of the incident wave direction for asymmetric changes in depth; a result proven by Kreisel (1949), (2) For asymmetrical bathymetric anomalies with h 1 = h 1 a zero reflection coefficient occurs only at k 1 h 1 = 0, and (3) For asymmetrical bathymetric anomalies with h 1 :t:h 1 the only k 1 h 1 value at which KR = 0 is that approached asymptotically at deepwater conditions. The wave field transformation by 3D bathymetric anomalies was demonstrated by two methods (3D Analytic Step Method and Analytic Exact Solution Method)
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210 developed in this study with good agreement shown between the methods for shallow water conditions The 3D Step Method compared well with the laboratory data of Chawla and Kirby (1996) as well as the numerical models REF/DIF1 (Kirby and Dalrymple 1994) and FUNW A VE 1.0 [2D] (Kirby et al., 1998) and a 2D fully nonlinear Boussinesq model (Kennedy et al., 2000) for several bathymetries and linear incident waves. The agreement between numerical and the 3D Step Model can be used to the benefit of past and future numerical models, with the numerical models employing the analytic model for verification of the numerical scheme contained in the numerical model. The impact of the configuration of the bathymetric anomaly on the wave transformation was demonstrated using pits or shoals (in the form of truncated cones) of constant volume. Gradual transition slopes were found to cause greater wave sheltering shoreward of a pit with the degree ofupwave reflection dependent on incident wave and pit characteristics. The energy reflected by anomalies of constant volume was found to be greatly reduced for gradual transition slopes. The reflection coefficients for a pit were found to oscillate with the dimensionless wavelength (kh) with a decreasing trend in the magnitude as kh increased and the only value of complete transmission for the trivial solution at kh = 0. For the shoals of constant volume the reflection coefficients were found to oscillate with an increasing trend in the magnitude, except for the most gradual transition slope where little reflection occurred. The reflection coefficient versus the nondimensional quantity kr' where k is the wave number and r'is the apparent radius would provide another means to view the reflection caused by various pit geometries A method to determine r' must incorporate the depth dependency of the solution as the
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211 apparent radius should be larger than the average radius for the case of a pit since the waves "feel" the upper part of the pit more than the bottom of the pit. An analytic shoaling and refraction model (Analytic SIR Model) was developed to extend the 3D Analytic Step Model into the nearshore region where the depth is non uniform (linear slope or Equilibrium Beach Profile form) in the crossshore direction. The Analytic SIR Model was found to produce breaking wave heights, breaking wave angles and breaking locations (crossshore and longshore) similar to REF/DIF1 (Kirby and Dalrymple, 1994) for the same bathymetries. Shoreline changes shoreward of a bathymetric anomaly were calculated using the Analytic Shoreline Change Model, which uses the breaking wave height, angle and location values determined from the Analytic SIR Model. Several bathymetries were studied and results indicate that the shoreline evolution landward of a bathymetric anomaly is highly dependent on the longshore transport coefficients used with either shoreline advancement or retreat possible at the same location depending on the coefficient values. 7 .2 Future Work Extending the 3D Step Model to allow elliptic bathymetric anomalies will allow the study of borrow areas of more realistic shape, which usually have a much larger longshore extent than crossshore In elliptic coordinates the solution is developed from a series of Mathieu functions, instead of Bessel functions for the case of a circular anomaly. The general setup for the 3D Step Model matching conditions and matrix solution should remain generally unchanged for the elliptic anomaly case. The range of longshore sediment transport coefficient, K 2 must be better constrained in order to predict the shoreline response caused by an actual bathymetric
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212 anomaly. At this point the values of the longshore transport coefficients must be considered site specific with values obtained after laboratory or field study. This limits the use of the Shoreline Response Model to calibrating models based on known planform changes. Laboratory or smallscale field studies examining the shoreline response landward of a bathymetric anomaly would be beneficial in better constraining the range of values for the longshore transport coefficients and improve the predicative capacity of future shoreline change models. For laboratory studies the effect of scale on the second longshore transport term (Q 2 ) must be considered with regard to the wave height and longshore distance in the dH b term. dY b
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APPENDIX A ANALYTIC WA VE ANGLE CALCULATION The wave angles are calculated using a procedure outlined in Bender (2001) using the timeaveraged energy flux based on the total velocity potential outside the bathymetric anomaly. The time averaging is obtained by taking the conjugate of one of the complex variables : P r U r EFlux x r = P r Ur = 2 (* means conjugate) (A1) PrVr EF!uxy = P r V r = (* means conjugate) T 2 (A2) where p is the pressure and u and v are the velocities in the crossshore and longshore directions, respectively : p =po
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214 Therefore the equation to determine the time averaged energy flux, in the x direction, at a single point due to the incident potential and the reflected potential is The wave angle at each point is then solved employing 1 ( reat(EFluxr r )J a=tan ( ) +a 1 realEFlux x r (A8) where a 1 is the incident wave direction.
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APPENDIXB ANALYTIC FARFIELD APPROXIMATION OF ENERGY REFLECTION The farfield approximation for the energy reflection starts by constructing a half circle oflarge radius in the upwave region of the anomaly that captures all the reflected energy flux. The depth integrated, timeaveraged energy flux is calculated where total reflected energy flux at any location is where p is the pressure and velr is the velocity in the radial direction : 8 p =p at 8 ve l =r ar Large value approximations are taken for the appropriate Bessel functions (B1) (B2) (B3) 3 (Abramowitz and Stegun, 1964) and the operation f(pvez; )d0 is performed to quantify the energy flux around the entire arc. After simplifying the resulting equations, the forms for the components ofEq. B.1 are (B4) 215
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216 where after the substitution (B7) which allows Eqs. B5 and B6 to be combined (B8) In Eqs B.4 B.8 AN is the unknown reflected wave amplitude coefficient for each Bessel function mode, y is defined in Eq. 4.17, and Mand N are the Bessel function modes uses in the solution where ifM = N: (B9) and ifM :t:N: sin(M +N)3n l sin(M +N)n l sin(M N)3n l sin(M N)n l Q 1 2 1 2 + 1 2 1 2 (B 10) MN (M +N) (M N) Using Eqs. B.4 B. l O the energy reflected by a bathymetric anomaly can be approximated in the farfield using the amplitude coefficients determined using the 3D Step Model. The reflection coefficient is calculated after dividing the reflected energy
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217 flux in the farfield by the energy flux incident on the bathyrnetric anomaly and taking the square root.
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APPENDIXC ANALYTIC NEARSHORE SHOALING AND REFRACTION METHOD The Analytic SIR Model was developed to remove the limitation of the 3D Step Model that requires a uniform depth outside the bathymetric anomaly and therefore prohibits any nearshore shoaling and refraction. The Analytic SIR Model uses the w ave height and direction v alues obtained from the 3D Step Model for a transect that represents the start of the nearshore region and the shoreward end of the uniform depth region In the nearshore region the assumption of no wave transformation due to the bathymetric anomaly is made Figure C1 shows a schematic of the nearshore region z y Analytic Analytic Step + +S I R Model Model dy Breaker Line I \ \ \ I , \ I dy b / f ,/(Xb, Y b lib) (H b, ~) average t O I dx I 1+x .i Figure C1 : Setup for analytic nearshore shoaling and refraction method 218 X
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219 The Analytic SIR Model will first be formulated for the simplest case of a uniform nearshore slope, with appropriate changes for the case of a nonuniform slope defined by an equilibrium beach profile form. The initial values of the wave height (Hsj) and wave angle (8s j ) at the start of the nearshore region are determined using the analytic step method for a uniform depth h 5 The nearshore refraction is computed using Snell's Law: Sin0 s J =Sin0 .. l,J C.. l j (C1) where the subscript i and j indicate the crossshore and longshore location respectively and C is the celerity which is taken to be the shallow water relationship : (C2) where for a linear slope, m the water depth, h is equal to m (x' X; ) with x defined in Figure C1. Next the appro x imation Sin0 = d y dx is made. Using Eqs. C1 through C3 allows d y = Sin0 C ; ; = Sin0 jii;:; = Sin0 .J( x x; ; ) dx . s 1 C s,1 r::;;s 1 x 1 J s J '\J g" s j '\J X A coefficient is defined which varies only in the longshore: Sin0 B( y. )= S j J R ( C3) ( C4) (C5) Next the integral of Eq C4 is taken to relate the change in Y location to the change in X location:
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220 y(i, j) x(i j) ~f dy = B(y) fJ x' xi,j dx; J (C6) y(s ,j) 0 Integration by parts yields 2 B( )[ ( ) ] y .. y +Y X xx . 1 J S,j 3 j l ,j (C7) To determine the change in Y location based on the change in wave angle, which is known form Snell's Law (Eq. 61) the following equations were used dy = dy dB(yj) = 3[ x' x' x . ] cos0s ,j (C8) d0s ,j dB(y) d0s j 3 ( , ) fl 11 =dy fl0 fly=3[x' (x'x .. ) ]cosB s,j fl0. (C9) '.I' d0 S J 3 1 J R S,J where fly is the distance between wave rays and fl0 = 0 s,j+I 0 s,j. Using the Eq C9 fly can be obtained for a selected X location in the nearshore zone. The shoaled wave height at any location in the crossshore can be calculated using (C10) where b is the spacing between wave rays, which determines the refraction, and Cg is the group velocity, which reveals the shoaling. Taking Havgij to be the average wave height for Hij + I and Hi j, 0avgij to be the average wave angle for 0sj +I and 0sj, and with the group velocity in the shallow water limit (cg sha ll ow = C = .Jg* h) the final equation for the shoaled and refracted wave height becomes (C11)
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221 When Havgi ,j Kh; ,j then breaking occurs where K is the breaking criteria The wave height shoreward of the initial break point is equal to the breaking criteria times the depth. The preceding formulation has been for a nearshore region with a planar beach. The Analytic SIR Model can also be formulated for a nearshore region with the nonlinear slope of an Equilibrium Beach Profile where the depth is determined employing h = A(x' x) (C12) where A is a coefficient based on the grain size with dimensions of m 1 1 3 The change in the depth equation leads to changes in Eqs C4 through C9 with the new equations taking the form dy C. r::,;,(x' x \ ~ s e ~s e _'1_l5";J __ s e 1 1 J zn s,j zn s,j jiiC; zn s,j I/ dx ;,j C s 1 gh x' l 3 S,j (C13) (C14) y(i,j) x(i,j) f dy = B(y j ) f (x' xi j dxi j (C15) y(s,j) 0 2B( )[ ( ) ] Y. y +y X X x .. l J S,j 3 J 1,/ (C16) dy dy dB(y) 3 [ 1 4 1 4 / ] cos0 s,j ==X 1 3 (x x . )1 3 d0 s,j dB(y) d0 s,j 4 1 1 x' (C17) /),y= d y tie tiu=I[x' (x'x . ) ]coses ,j tie ',J' dB s,1 ',J' 4 .1 x' s 1 (C18)
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APPENDIXD ANALYTIC SHORELINE CHANGE THEORY AND CALCULATION Knowledge of the breaking wave height and angle in the nearshore zone allows the calculation of the longshore sediment transport and resulting change in shoreline position for a simplified nearshore system using the Analytic Shoreline Change Model (Shoreline Change Model). A valid domain for the Shoreline Change Model consists of a uniform depth region containing a bathymetric anomaly that connects to a nearshore region with a sloping bottom. The Analytic SIR Model (Appendix C) is employed to calculate the breaking wave height, angle, and location using the results of Analytic Step Model as the initial wave values at the juncture of the two regions. For normally incident waves with no longshore gradient in wave height the equilibrium shoreline planform will be oriented normal to the incident waves However, due to the offshore bathymetric anomaly, a nonuniform alongshore wave height and angle distribution at the start of the nearshore region develops and a uniform shoreline planform will not be in equilibrium with the incident waves. The nonuniform breaking wave height and angles will induce the shoreline to change form until an equilibrium planform is achieved A simple version of the shoreline change model was developed in Bender (2001) for use with the analytic wave transformation model developed that did not account for nearshore shoaling and refraction and was limited to abrupt transitions in depth and shallow water waves The continuity equation is the basis for a relationship between the 222
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223 shoreline position and the change in volume for the profile The assumptions of initially straight and parallel bottom contours are made in the Analytic SIR Model with no wave transformation in the nearshore region due to the bathymetric anomaly. These concepts are used to determine the longshore transport and resulting shoreline change Figure D 1 is a schematic of the nearshore region used in the Shoreline Change Model, which indicates the conventions for the coordinate system and angle directions used in the model. y Shoreline After\ Contours After 1 Time Step 1 Time Step ~ : : I X : \ : \ : J = J I i ; ~ ;' ., ., ; ., : ," ,," ; I I I \ ' " I \ : ' " : : , I l \ 1 ., ) / I Irntihl v . Initial Contours Shoreline __________ i ~ _____ _,/ Figure D1: Definition sketch for analytic shoreline change method showing shoreline and contours for initial location and after shoreline change.
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224 The breaking wave height and angle at each point (i,j) of in the longshore direction of the nearshore zone are used to determine the longshore transport with a twoterm transport equation: (D1) where Hb is the breaking wave height, a 6 is the breaking wave angle, {3 is the shoreline orientation, sis the ratio of sand to water densities, pis the porosity of the sediment K is the breaking criteria K 1 and K 2 are the sediment transport coefficients, and tan(m) equals the slope of the nearshore zone If an EBP form is used the nearshore slope (m) is equal to the average slope from the shoreline to the crossshore breaking location averaged over the longshore. The frrst transport term is driven by the waves approaching the shore at an angle and is equivalent to the CERC transport equation (Shore Protection Manual, 1984) while the second term which is sometimes not included, is due to the gradient in the wave heights or setup. Ozasa and Brampton (1979) and Gourlay (1982) among others have studied the second transport term with the current formulation based on the form of Ozasa and Brampton Bakker (1971) developed alongshore current term based on the variation in longshore wave height; this method is outlined in Ozasa and Brampton (1979) and extended by O z asa and Brampton to calculate the longshore transport for a variation in longshore wave height. Gourlay (1982) contains a thorough examination of the longshore transport caused by both the breaking wave angle and a longshore gradient in the wave height and provides an extensive review of various derivations ofEq. D1.
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225 Kraus (1983) states that K 1 and K 2 should be taken as sitespecific parameters to be determined by calibration, with K 1 acting as a timeadjustment parameter and K 2 a function of the transport parameters of the individual beach. With Eq. D1 it is possible to have either erosion or accretion at a particular location depending on the values of K 1 and K 2 selected and the breaking wave and shoreline conditions. The shoreline change is calculated using the continuity equation: ax 8 Q, ota l 1 M = 8Q to t a l 1 !it e t B Y h. + B BY h. + B (D2) where h is the closure depth which is the depth of the uniform depth region B is an assumed berm height and a positive change in Xdirection indicates erosion The maximum time step !itm ax for model stability is determined using where !iY 2 !i t <max 2G This criterion dictated the time step used in the models. ( D3) (D4) The Analytic SIR Model determines the breaking wave height angle and location Due to the initial wave angles and wave refraction in the nearshore zone the constant spacing between wave rays at the start of the nearshore slope is altered at the breaking location The v alue ofdH b is determined by taking the gradient in the longshore dYi, direction and using a simple moving average procedure to smooth out some of the noise
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226 created by the unequal longshore spacing of the wave rays with dYb equal to the longshore spacing at breaking Using Eq. D1 the total longshore transport (Qt o t a 1) is calculated and the change in the shoreline position at each longshore location is determined with Eq. D2. The Y locations of the shoreline change values are the same as the Y locations of the initial wave height and angle values at the start of the nearshore region. The crossshore slope is then translated in the crossshore direction depending on the sign of !).X thus altering the bathymetric contours so they are no longer straight and parallel, just parallel. The new shoreline and bathymetric contour orientation (which is constant in the crossshore direction) is determined using /31 = tan I(xl ,j+ I xl ,j ) ,1 d y (D5) The change in bathymetry from straight and parallel contours leads to a change in the nearshore refraction. Dean (2003) developed an analytic solution for the change in wave refraction, and consequential change in the breaking wave angle, caused by the change in shoreline orientation and contours : !).a = /3 (1C b ) /3 (1h b(i j) J b l J C l ,J h (s) (D6) Eq. D6 is used to modify the breaking wave angles determined from the Analytic SIR Model. Small changes in the wave height and angle are assumed to result from the cross shore translation of the nearshore zone as the planform evolves to a new equilibrium The change in the refraction and shoaling caused by the new shoreline orientation are also assumed to be minimal. This allows the breaking wave height angle and location to
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227 be determined once, for the initial shoreline position and orientation. These breaking wave values are then used to determine Qtotat as the shoreline planform evolves.
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235 Sumerell, H.R. 2000. Martin County, Florida beach nourishment project: Evaluation of project performance and prediction capabilities. Master's Thesis. Department of Civil and Coastal Engineering University of Florida. Takano, K. 1960 Effets d un obstacle paralellelepipedique sur la propagation de la houle Houille Blanche, 15: 247. Tang, Y. 2002. The effect of offshore dredge pits on adjacent shorelines. Masters Thesis. Department of Civil and Coastal Engineering, University of Florida. Wang Z and Dean R.G. 2001. Manatee county beach nourishment project performance and erosional hot spot analyses UFL/COEL2001 / 003. Department of Civil and Coastal Engineering, University of Florida. Wehausen J.V. and Laitone E.V. 1960. Surface Waves Handbuch der Physik. Vol. 9: pp 446477 Wei G. Kirby J T. Grilli S. T. and Subramanya, R ., 1995. A fully nonlinear Boussinesq model for surface waves. I. Highly nonlinear unsteady waves. Journal of Fluid Mechanics, 294: 7192. Williams A.N 1990. Diffraction oflong waves by a rectangular pit. Journal of Waterway Port, Coastal and Ocean Engineering, 116 : pp. 459469 Williams, A.N. and Vasquez J.H 1991. Wave interaction with a rectangular pit. Journal of Offshore Mechanics and Arctic Engineering, 113: 193198. Williams, B.P 2002. Physical modeling of nearshore response to offshore borrow pits Masters Thesis Department of Civil and Coastal Engineering, University of Florida.
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BIOGRAPHICAL SKETCH The author was born in Binghamton New York, on December 28, 1976 He was raised in nearby Endwell and grew up looking forward to the annual family vacation to the shore where his fascination with the coast developed. Mr Bender graduated from the University of Rhode Island with an ocean engineering degree in May of 1999. While attending the university he lettered all four years as a member of the varsity tennis team and was captain his final two seasons. A postgraduation crosscountry trip with his future wife was the culmination of many dreams to see the country and his scattered extended family The author was awarded an Alumni Fellowship from the University of Florida to complete his graduate work in the Civil and Coastal Engineering Department starting in the fall of 1999. He obtained his master's degree in coastal engineering in the spring of 2001. This work is the culmination of his doctoral studies, which he found very rewarding. The author enjoys spending time with his high school sweetheart and wife of over 2 years, Kathryn, and their dog, Rhody. Having accepted a job in Jacksonville Florida, with Taylor Engineering, the author and his wife will remain well south of the cold and snow that define where they grew up and much closer to the ocean. 236
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I certify that I have read this study and that in my opinion it conforms to acceptable standards of scholarly presentation and is fully adequate, in scope and quality, as a dissertation for the degree of Doctor of Philosophy. Robert G. Dean, Chairman Graduate Research Professor of Civil and Coastal Engineering I certify that I have read this study and that in my opinion it conforms to acceptable standards of scholarly presentation and is fully adequate, in scope and quality, as a dissertation for the degree of Doctor of Philosophy. Daniel M. Hanes Professor of Civil and Coastal Engineering I certify that I have read this study and that in my opinion it conforms to acceptable standards of scholarly presentation and is fully adequate, in scope and quality, as a dissertation for the degree of Doctor of Philosophy Andrew Kennedy Assistant Professor of Civ Engineering I certify that I have read this study and that in my opinion it conforms to acceptable standards of scholarly presentation and is fully adequate, in scope and quality, as a dissertation for the degree of Doctor of Philosophy. :::TT ~~ Assistant Professor of Civil and Coastal Engineering
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I certify that I have read this study and that in my opinion it conforms to acceptable standards of scholarly presentation and is fully adequate, in scope and quality, as a dissertation for the degree of Doctor of Philosophy. Ulrich H. Kurzweg Professor of Mechankal and Aerospace Engineering This dissertation was submitted to the Graduate Faculty of the College of Engineering and to the Graduate School and was accepted as partial fulfillment of the requirements for the degree of Doctor of Philosophy. May 2003 jJ Pramod P. Khargonekar Dean, College of Engineering Winfred M. Phillips Dean, Graduate School
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