|
UFL/COEL-77/001
DETERMINATION OF DIRECTION OF LITTORAL TRANSPORT
ALONG THE NORTH SHORE OF SANTA ROSA ISLAND,
FLORIDA
Yu-Hwa Wang
T.H. Chang
Sidney L. Harrell
March, 1977
Sponsor:
Department of the Army
Mobile District, Corps of Engineers
Mobile, Alabama
TABLE OF CONTENTS
age
I. Introduction 1
II. General Description of the Project Area 1
III. Field Measurements and Procedures 1
1. Test site and operating period 1
2. Sampling grid and tracer sand preparation 2
3. Injection of tracer and recovery of samples 2
4. Measurements of environmental factors 3
A. Visual observations 3
B. Recording instruments 3
IV. Results, Discussion and Conclusions 4
V. Recommendations 6
Appendix: List of Figures 7
I. INTRODUCTION
The study described in this report was authorized by a contract dated
October 19, 1976 between Department of the Army, Mobile District, Corps of
Engineers, Mobile, Alabama and the Engineering and Industrial Experiment
Station, University of Florida. The purpose of this study was to determine
the actual direction of littoral transport along the north shore of Santa
Rosa Island in the vicinity of Pensacola Beach, Florida. To accomplish this
objective the sand tracer method was used for the study. Visual observations
and instrument recordings of the environment factors were also made during
the tracing operations. The investigation covered a time span from September
14, 1976 to March 12, 1977.
II. GENERAL DESCRIPTION OF THE PROJECT AREA
Santa Rosa Island is a barrier island facing the Gulf of Mexico that
lies between Pensacola Beach and Fort Walton Beach, Santa Rosa Sound, sit-
uated on the north of the island, is an integral part of the intracoastal
waterway between Panama City and Mobile Bay. Frequent barge traffic as
well as recreational boating was observed during the sand tracing operations,
The area of immediate interest to this investigation was the north shore of
Santa Rosa Island near Pensacola Beach. It stretches from Avenida 10 to
Santa Rosa Villa, a highly developed recreational community.
III. FIELD MEASUREMENTS AND PROCEDURES
1. Test site and operation period:
The sand tracing operation and environmental factor observations were
carried out in November 1976 and again in February 1977, The location of
the test sites are shown in figure 1. The categories and operating duration
are shown in the following table.
environmental factor observations
Site A 13-14 Nov. 1976 13-14 Nov. 1976
15-20 Feb. 1977 15-20 Feb. 1977
Site B 13-14 Nov. 1976 13-14 Nov. 1976
19-20 Feb. 1977
Site C ------------- 19-20 Feb. 1977
2. Sampling grid and tracer sands preparation:
A. The November 1976 operation: The grid system established at site A
is shown in figure 2. The initial spacing was 25 feet apart, but was expanded
to 50 feet and finally 100 feet between sampling stations, A similar grid
was established at site B as shown in figure 3.
B. The February 1977 operation: The initial spacing of 25 feet was
too close. Therefore, 50 feet spacing between the sampling stations are adopted
for site A. The grid system is shown in figure 4.
C. Tracer sands: Sands were collected from site A and B shortly before
the tracing operation. These sands were coated with fluorescent dye in the
Coastal and Oceanographic Engineering Laboratory (COEL), University of Florida.
These colored sands were then injected in the predetermined coordinate system
as shown in figures 2 to 4.
3. Injection of tracer and recovery of samples
A. November 1976 operation: Approximately 100 pounds of tracer sand
was dumped instantaneously into the water at site A and B. The location of
the injections are shown in figures 2 and 3. A dredge-type sand sampler was
used for collecting the samples and the sampling stations were according to
the predetermined coordinate system. The sampling frequency was based on the
tidal cycles (approximately 24 hours). In this way, the field crew could
work alternatively between sites A and B. Each sample was put into a sampling
sand tracing
environmental factor observations
Site A 13-14 Nov. 1976 13-14 Nov. 1976
15-20 Feb. 1977 15-20 Feb. 1977
Site B 13-14 Nov. 1976 13-14 Nov. 1976
19-20 Feb. 1977
Site C ------------- 19-20 Feb. 1977
2. Sampling grid and tracer sands preparation:
A. The November 1976 operation: The grid system established at site A
is shown in figure 2. The initial spacing was 25 feet apart, but was expanded
to 50 feet and finally 100 feet between sampling stations, A similar grid
was established at site B as shown in figure 3.
B. The February 1977 operation: The initial spacing of 25 feet was
too close. Therefore, 50 feet spacing between the sampling stations are adopted
for site A. The grid system is shown in figure 4.
C. Tracer sands: Sands were collected from site A and B shortly before
the tracing operation. These sands were coated with fluorescent dye in the
Coastal and Oceanographic Engineering Laboratory (COEL), University of Florida.
These colored sands were then injected in the predetermined coordinate system
as shown in figures 2 to 4.
3. Injection of tracer and recovery of samples
A. November 1976 operation: Approximately 100 pounds of tracer sand
was dumped instantaneously into the water at site A and B. The location of
the injections are shown in figures 2 and 3. A dredge-type sand sampler was
used for collecting the samples and the sampling stations were according to
the predetermined coordinate system. The sampling frequency was based on the
tidal cycles (approximately 24 hours). In this way, the field crew could
work alternatively between sites A and B. Each sample was put into a sampling
sand tracing
cloth bag (2" x 4") with station number marked on the label, and then, sorted
into sample sets for shipping to Gainesville for tracer count in COEL.
B. February 1977 operation: Sands were collected at two locations of
site A for making tracers. The sands collected at the high-water mark were
dyed blue and green. The sands collected 100 feet bayward from the high water
mark were dyed yellow and red. These tracer sands were put back in four
locations. Their relative positions are shown in figure 4. The purpose of
this arrangement was to see if grain size and injection position influenced
the sand tracing technique. However, only blue tracers were counted for
the time being. The blue tracer alone was considered adequate for the purpose
of determining the littoral drifting direction.
The sampling frequency was chosen to correspond to the high and low water
level. The sampling procedure was similar to that for November 1976 operation,
4. Measurement of physical parameters:
A. Visual observations: Wave parameters such as height, length, direction,
and period, were observed during sampling operations. Littoral drift currents
were obtained by following a dye pack. These data are presented in the
results and conclusion section of this report.
B. Recording instruments: Two tide recorders were installed. One was
located at the Pensacola Beach Causeway Bridge. The second tide gage and a
wind anemometer were located at the private pier of Dr. C. Gifford. The
data are presented in the results and conclusion section of this report.
IV. RESULTS AND CONCLUSIONS
1. Results
The results are organized according to date and sampling sites in the
following tables:
A. November 1976 operation:
Equal Concentration Contours
Environmental Factors
Figures Site Figures Site
November 13, 1976 5a, 7a A, B 6a, 8a A, B
November 14, 1976 5b, 7b A, B 6b, 8b A, B
Wind records for the tracing operating period are given in figures 9a
and 9b. Tide records are presented in figures 10a through lOf.
B. February 1977 operation:
Date Equal Concentration Contours Environmental Factors
Figures Site Figures Site
February 15, 1977 la A 12a A
February 16, 1977 llb A 12b A
February 17, 1977 11c A 12c A
February 18, 1977 11d A 12d A
February 19, 1977 lie A 12e, 13a, 14a A, B, C
February 20, 1977 11f A 12f, 13b, 14b A, B, C
Wind records for the
figures 15a through 15e.
17a-17e.
period from February 15 to 20, 1977 are given in
Tide records are presented in figures 16a-16d; and
Date
2. Discussion and conclusion:
elliptical bars
arp point
transverse bars
land
F. Considerable bottom changes have taken place between November 1976
and February 1977. The shoals in figure 6b have grown both in size
and in height, as shown in figure 4b. A transverse bar situated
between 200 to 300 feet East (figure 4a) in the NE direction has
grown out of the water surface. Sandpipers standing on the dry
ridge of this transverse bar can be seen in figure 4c.
t
er
A. The observed wave parameters in Santa Rosa Sound are directly
related to the wind conditions.
B. There is an observable correspondence between the littoral transport
and littoral drifting currents.
C. Figures 5a and 5b have shown that the longshore movement was strong
than the on/offshore components.
D. Figures 7a and 7b have shown that the tracer sands moved around
the sharp land feature first and then towards the beach.
E. Many distinctive land features have been observed in the project
area, such as crescent sharp points (e.g. site B), and the semi-
elliptical submerged sand bar which is superimposed with transverse
bars in the NE and NW directions. It seems that all these have a
strong indication of edge wave effects.
G. Different patterns of tracer contour maps between November 1976 and
February 1977 are clearly observable. Contour map figures 5 and 7
are characterized by one peak region while figures lla to llf have
many peaks and valleys.
H. Peaks of the contour map, figures lla to llf, correspond to the
shoals in figure 4b and transverse bar in figure 4c very well. It
may be explained that the tracers left the point of injection and
moved along various route until they stopped at the shoals and
transverse bar.
I. There were relatively high concentration contours along the line
which was parallel to the shore and 300 feet north. A sudden
change in water depth, consequently, a sudden reduction of current
velocity bayward along the line was realized. This may explain
why the deposition of tracers along this line.
J. A study of the sequence of figures lla to llf may shed light for
bar formation in that area.
V. RECOMMENDATIONS
1. It would be desirable to extend the sand tracing study to cover the
summer months.
2. Correlation analyses between (1) distinctive land features, (2) sand
movements and environmental factors, would be most beneficial prior
to any shoreline activities such as a beach nourishment project.
3. The present study provided for the collection of considerable data and
the determination of the direction of littoral transport. It is recom-
mended that the study be extended to obtain additional information about
sand transport from the data already collected.
-6-
G. Different patterns of tracer contour maps between November 1976 and
February 1977 are clearly observable. Contour map figures 5 and 7
are characterized by one peak region while figures lla to llf have
many peaks and valleys.
H. Peaks of the contour map, figures lla to llf, correspond to the
shoals in figure 4b and transverse bar in figure 4c very well. It
may be explained that the tracers left the point of injection and
moved along various route until they stopped at the shoals and
transverse bar.
I. There were relatively high concentration contours along the line
which was parallel to the shore and 300 feet north. A sudden
change in water depth, consequently, a sudden reduction of current
velocity bayward along the line was realized. This may explain
why the deposition of tracers along this line.
J. A study of the sequence of figures lla to llf may shed light for
bar formation in that area.
V. RECOMMENDATIONS
1. It would be desirable to extend the sand tracing study to cover the
summer months.
2. Correlation analyses between (1) distinctive land features, (2) sand
movements and environmental factors, would be most beneficial prior
to any shoreline activities such as a beach nourishment project.
3. The present study provided for the collection of considerable data and
the determination of the direction of littoral transport. It is recom-
mended that the study be extended to obtain additional information about
sand transport from the data already collected.
-6-
APPENDIX
List of Figures
LIST OF FIGURES
Figure No. Page
1. Site Location Map 8
2. Sampling Grid at Site A, November Operation, 1976 9
3. Sampling Grid at Site B, November Operation, 1976 10
4. Sampling Grid at Site A, February Operation, 1977 11-13
5a through 5b. Equal Concentration Contour for Site A, November
Operation, 1976 14-15
6a through 6b. Observed Littoral Current and Wave Parameters at
Site A, November Operation, 1976 16-17
7a through 7b. Equal Concentration Contour for Site B, November
Operation, 1976 18-19
8a through 8b. Observed Littoral Current and Wave Parameters at
Site B, November Operation, 1976 20-21
9a through 9b Wind Records, November Operation, 1976 22-23
10a throughlOf. Tidal Records, November Operation, 1976 24-29
11a through 1lf. Equal Concentration Contours for Site A,
February Operation, 1977 30-39
12a through 12f. Observed Littoral Current and Wave Parameters
at Site A, February Operation, 1977 40-42
13a through 13b. Observed Littoral Current and Wave Parameters
at Site B, February Operation, 1977. 43-49
14a through 14b. Observed Littoral Current and Wave Parameters
at Site C, February Operation, 1977 50-51
15a through 15e. Wind Records, February Operation, 1977 52-56
16a through 16d. Tidal Records, Private Pier, February Operation, 57-60
1977
17a through 17e. Tidal Records, Causeway Bridge, February Operation, 61-65
1977
I.
33.5;;;1?~
Np
>1-
I I
aROA
S..--
Site
Site A
Site C
pg
ALATEA INN
WHITE SANDS RESORT Q ^\C
Figure 1. Site location map
-- ."-'
34
r
.t
r
Ldj~
r
SSi~
0 0 0 0 -o
0 0 0 0 C
0 0 0 0
0 0 0 0
o 0 0 0 0 0 0 0 0
o 0 0 0 0 0 0 0 0
0tae inetn 0point- 00 0 0
/ ^ / ^/ / / / / / / / /y '^ /~
Distance (ft.)
Figure 2. Sampling grid at site A, November operation, 1976
-300 o
0
-200 o
-P-
4-
)U 0
0
r-
a100o
o
77-~7
o 100
0
0 0
Distance (ft.)
Figure 3. Sampling grid at site B, November operation, 1976
Run No.
Color code:
0 0 0
o o o o
o o o o
0 0 0 0
0 o o
o a. a a
4275
0 a
175 o o
0 0
o o0
o F
0 0
@.- tracer injecting point
75 o o o o
'25 o o
0 0
Figure 4a. Sampling grid at site A, February operation, 1977
Date:
Time:
F o
E o
D o
o D
o B
SO 0 0 0 e o o o A
--W oo o o o o o \E--
300 200 100 00 100 200 .300
Distance (ft.)
125
300
200
-100
Distance (ft.)
Figure 4b.
Shoal location
-12-
shoal
300
200
100
300
- ef 11 a W6-
[-
300
200
100
transverse bar
Distance (ft.)
Figure 4c. Transverse bar location
-13-
Numbers = tracer sand count per 40 gm sample
@ = tracer sand injection point
Santa Rosa Sound
- water line
Land -
Distance (ft.)
Figure 5a. Equal concentration contours for site A
Date: 11/13/76
4-,
4-
100
Numbers = tracer sand count per 40 gm sample
H = tracer sand injection point
Santa Rosa Bay
__ w water
Land
200 100
Distance (ft.)
Figure 5b. -Equal concentration contours for site A
Date: 11/14/76
200
u_
u
100 .5
-4->
-n
9 -, -J
0 0 0
wave length: 10 ft.
wave height: 9 in.
wave period: 2 sec.
0 wave direction: NE300
date: 11/13/76 Time: 9:30 CST
O 0 0
0 0 0 0 0 0
Average current speed 0.23 fps
0 0 0 0 0 0
0 0 0 0 0 0
--,
0 0 0 0 0 0 0 0 0 0
-I*I
0 0 0 0 0 0 0 0 0 ,
o o o o a o < o o 8 o
t^
0 0 -->-^ 0 0 0 0 0 (i
Distance (ft.)
Figure 6a. Observed littoral current and wave parameters at site A
wave length: 25 ft.
wave height: 1 ft.
wave period: 2 sec.
o Wave direction: NE
date: 11/14/77 Time: 8:40 CST
0o0
I~!O05"
o 0 0 0 o 300 0
Average current speed 0.72 fps
o0 0 a o o
0 o 0 0 o o -200 0
4-
0 00 C,
0 o 0 0 0 0 U 0
4'4"
0 0 0 0
0 0 0 0
OOO O
OO OO
0 0 0 0
tracer injecting point
0 0 0 0
Distance (ft.)
Observed littoral current and wave parameters at site A
Figure 6b.
Numbers = tracer sand count per 40
= tracer sand injection point
Santa Rosa Bay
gm sample
T 200
03 -
50
water line /
/ JLand
201 100 0
Distance (ft.)
Figure 7a. Equal concentration contoursifor site B
Date: 11/13/76
I
Numbers = tracer sand count per 40 gm
Stracer sand injection point
Santa Rosa Sound
water line / Land
0
Distance (ft.) I
I
200
Figure 7b.
Equal concentration contour for site B
Date: 11/14/76
wave length: 15 .ft.
wave height: 7 in.
wave period: 1.6 sec.
wave direction: NE
Average current speed V, = 0.25 .ft/sec
Date: 11/13/76 Time: 15:37 17:00
distance
represents sampling stations
,dye pack dropped
Figure 8a.
Observed littoral current and wave parameters at site B
-20-
i
wave length: 25 ft.
wave height: 1 ft.
wave period: 1.6 sec.
wave direction: NE
date: 11/14/76
Average current speed 0.77 fps
scale
O' 1o0'
Figure 8b. Observed littoral current and wave parameters at site B
5 mph
10 mph -
15 mph m
20 mph
Location: Private pier,Avenida 22, Santa Rosa Island
Date: 11/13/76
Figure 9a. Wind records
-22-
15 mph
20 mph
Location: Private pier, Avenida 22, Santa Rosa Island
Date: 11/14/76
Figure 9b. Wind records
-23-
Location: Private pier, Avenida 22, Santa Rosa Island
Date: 11/9/76
+30 Time: 07:34 CST
+20
E
S+10
0
I>
~-10
Lii
Date: 11/10/76
Time: 07:34 CST
Hours
Figure 10a. Tide records
Location: Private pier, Avenida 22, Santa Rosa Island
Date: 11/10/76
Time: 09:19 CST
Date: 11/11/76
Time: 07:50 CST
Hours
Figure 10b. Tide records
Location: Private pier, Avenida 22, Santa Rosa Island
+3. Date: 11/11/76
Time: 07:53 CST
+2C
E
-,-
SI MSL
' > Hours
10
L.LJ
Date: 11/12/76
Time: 07:53 CST
Figure lOc. Tide records
Location: Private pier, Avenida 22, Santa Rosa Island
Date:11/12/76
+30t Time:09:25 CST
Date: 11/13/76
Time:09:25 CST
Hours
Figure 10d. Tide records
+20
E
+10
0
1>
Lio
-20
Location: Causeway bridge pier, Pensacola Beach
Date: 11/10/76
+30r Time: 08:22 CST
+20
-+10
r-
0
--10
-20
-30
Date: 11/11/76
Time: 08:22 CST
Hours
Figure l0e. Tide records
Location: Causeway bridge pier, Pensacola Beach
Date: 11/11/76
+30t Time: 08:23 CST
+20
E
3-10
*r-
-10
LU
-20
-30
Date: 11/12/76
Time: 08:23 CST
Hours
Figure lOf. Tide records
I
', tracer injecting point'
300 200 100 00 100 200 300
Distance (ft.)
Figure 11a-l.
Equal concentration contours for site A
Date: 2/15/77 Time: 13:00 14:00 CST
I-- W
tracer injecting point
0//
,0
300 200 100 00 100 200 300
Distance (ft.)
Figure 11a-2.
Equal concentration contours for site A
Date: 2/15/77 Time: 20:00 CST
e--- W
--- o/
tracer injecting point
300 200 100 00 100 200 300
Distance (ft.)
Figure llb-1.
Equal concentration contours for site A
Date: 2/16/77 Time: 9:00 10:15 CST
30
^-
--- W
*60-
So~_
tracer injecting point
s'o-
- 60 oo-
220
a\ 0
300 200 100 00 100
Distance-(ft,)
Figure 11b-2. Equal concentration contours for site A
Date: 2/16/77 Time: 14:00 15:30 CST
200 300
0 tracer injecting point
15
Zo0
-........2 2
300 200 100 00 100 200 300
Distance (ft.)
Figure llc-1. Equal concentration contours for site A
Date: 2/17/77 Time: 9:00 CST
Stracer injecting point
-60
75
300 200 100 00 100 200 300
Distance (ft.)
Figure 1c-2. Equal concentration contours for site A
Date: 2/17/77 Time: 15:00 CST
300 200 100 00 100 200 300
Distance (ft.)
Figure lld-1.
Equal concentration contours for site A
Date: 2/18/77 Time: 9:00 CST
300 200 100 00 100 200 300
Distance (ft.)
Figure lld-2. Equal concentration contours for site A
Date: 2/18/77 Time: 15:30 CST
Stracer injecting point
o50
S100
--- @ --0
300 200 100 00 100 200 300
Distance (ft.)
Figure lie. Equal concentration contours for site A
Date: 2/19/77 Time: 11:00 CST
tracer injecting point
100-
50--- _
30
BD-
1 100
20
220-
300 200 100 00 100 200 300
Distance (ft.)
Figure 11f. Equal concentration contours for site A
Date: 2/20/77 Time: 11:00 CST
Date: 2/15/77
Wave height: 6 in.
wave period: 2.5 sec.
wave direction: NW
Average current speed: 0.51 ft/sec
Date: 2/16/77
wave height: 4 in.
wave period: 3 sec.
wave direction: NW
Average current speed:
0.23 ft/sec
Date: 2/17/77
wave height: 3 in.
wave period: 2 sec.
wave direction: NE
Average current speed: 0.21 ft/sec
Date: 2/18/77
wave height: 6 in.
wave period: 1.7 sec.
wave direction: NW
Average current speed: 0.33 ft/sec.
Figures 12a, 12b, 12c, 12d
Observed littoral current and wave parameters at site A
-40-
0 0
wave length: 12.5 ft.
wave height: 3 in.
wave period: 1.82 sec
wave direction: NW300
date: 2/19/77 Tim
F o.
D o
B o
0 0
e; 10:30 CST
0 0 0
o o0
0 0 ,0 0
3' 3 4! 1,'" 5W'o
0 0 0
0 0
,275
0 0
Average current speed: C1 = 0.46 fps
C2 = 0.59 fps
175 o 0 o "e o F
2
>125
0 0
0 0
o 0 o oD
0, 9 o o o o D
,75
>_ 4!" -{':
o 0. 0 @
o o0 0
0 .0 0
o B
N N
1O 200 150
-_Q --
IUO 50 go bO
Distance in feet
Observed littoral current and wave parameters at site A
u U
300
Figure 12e.
o E
~-?--C c~-~ _
m
c
I 3U
G o
0 0 .0 0
12:30 CST
wave length: 10 ft.
wave height: 1 ft.
wave period: 0.5 sec.
wave direction: NW300
date: 2/20/77 Time:
0 0 0 0
E o
B o
0 0
Average current speed:
SG
o
C1 = 0.42 fps
C2 = 0.24 fps
175 o o
125
o o0
0 0 0 0
'25 o o
o o, 0 4o> o o o o
k-'\\ \ \.\ \
00 200 15o inn
50 00 50 100 150
Distance in feet
Figure 12f. Observed littoral current and wave parameters at site A
o F
o E
o D
o B
Date: 2/19/77
Time: 17:30 CST
Average current speed:
C = 0,32 fps
C2 0.45 fps
C
I\2
Observed littoral current and wave parameters at site B
0 50 100 (ft)
SCALE I
Figure 13a-1.
Date: 2/19/77
Time: 17:30 CST
Average current speed 0.35 fps
0 50s 10(ft)
SCALE
Figure 13a-2. Observed littoral current and wave parameters at site B
Wave length: 12.5 ft.
wave height: 10 in.
wave period: 0.5 sec.
wave direction: NW600
Date: 2/20/77 Time:
Average current speed: 0.51 fps
9:38 CST
scale
S 50 10b ft.
Observed littoral current and wave parameters at site B
Figure 13b-l.-
wave length: 12.5 ft.
wave height: 10 in.
wave period: 0.5 sec.
wave direction: NW600
Date: 2/20/77 Time:
Average current speed:
9:38 CST
scale
6 50 1bo ft.
Figure 13b-2. Observed littoral current and wave parameters at site B
= 0.44
= 0.36
= 0.58
fps
fps
fps
wave length: 8 ft.
wave height: 0.7 ft.
wave period: 0.5 sec.
wave direction: NW300
Date: 2/20/77 Time:
Average current speed 0.43 fps
14:00 CST
I I
0 50 100(ft)
SCALE
Observed littoral current and wave parameters at site B
Figure 13b-3.
wave length: 8 ft. Average current speed: C1 = 0.31 fps
wave height: 0.7 ft. C2 = 0.40 fps
wave period: 1.61 sec.
wave direction: NW300
Date: 2/20/77 Time: 14:00 CST ,
C
1
co
0 50 100(ft)
SCALE
Figure 13b-4. Observed littoral current and wave parameters at site B
wave length: 8 ft.
wave height: 0.7 ft.
wave period: 1.61 sec.
wave direction: NW300
Date: 2/20/77 Time:
Average current speed 0.41 fps
14:00 CST
0 50 100(ft)
SCALE
Observed littoral current and wave parameters at site B
Figure 13b-5.
Average current speed 0.40 fps
0 50 100(ft)
SCALE
Figure 14a. Observed littoral current and wave parameters at site C
Date: 2/1 9/ 77
Time: 16:03 CST
wave length: 10 ft.
wave height: 0.7 ft.
wave period: 1.75 sec.
wave direction: NW30"
Date: 2/20/77 Time:
Average current speed: C1 = 0,67 fps
C2 = 0.57 fps
13:00 CST
0 50 loo(ft)
SCALE
Observed littoral current and wave parameters at site C
Figure 14b.
10 mph -
15 mph
20 mph I
Location: Private pier,Avenida 22, Santa Rosa Island
Date: 2/16/77
Figure 15a.. Wind records
-52-
2.5 mph
5 mph
10 mph
15 mph
Location: Private pier,Avenida 22, Santa Rosa Island
Date: 2/17/77
Figure 15b. Wind records
-53-
10 mph
15 mph
20 mph
Location: Private pier, Avenida 22, Santa Rosa Island
Date: 2/18/77
Figure 15c. Wind records
-54-
20hrs
10 mph -
15 mph
20 mph
Location: Private pier, Avenida 22, Santa Rosa Island
Date: 2/19/77
Figure 15d. Wind records
-55-
15 mph -
20 mph .
30 mph
Location: Private pier, Avenida 22, Santa Rosa Island
.Date: 2/20/77.
Figure 15e. Wind records
-56-
Location: Private pier, Avenida 22, Santa Rosa Island
Date: 2/16/77
+30 Time: 11:12 CST
+20
+10
o MSL
-10 Hours
Date: 2/17/77
Time: 09:05 CST
Figure 16a. Tide records
Location: Private pier, Avenida 22, Santa Rosa Island
Date: 2/17/77
Time: 09:10 CST
Date: 2/18/77
Time: 09:10 CST
Hours
Figure 16b. Tide records
-20
-30
Location: Private pier, Avenida 22, Santa Rosa Island
Date: 2/18/77
Time: 09:35 CST
Date: 2/19/77
Time: 09:35 CST
Hours
Figure 16c. Tide records
Location: Private pier, Avenida 22, Santa Rosa Island
Date: 2/19/77
Time: 09:35 CST
Date: 2/20/77
Time: 08:38 CST
Hours
Figure 16d. Tide records
Location: Causeway bridge pier, Pensacola Beach
+31. Date: 2/15/77
Time: 08:00 CST
+20
Date: 2/15/77
.-+I( Time: 16:25 CST
+10
0 MSL
0
> 0 Hours
-20
-30
Figure 17a. Tide records
Location: Causeway bridge pier, Pensacola Beach
Date: 2/15/77
Time: 16:26 CST
Date: 2/16/77
Time: 16:26 CST
Figure 17b. Tide records
0
ni
ii-
Location: Causeway bridge pier, Pensacola Beach
Date: 2/16/77
Time: 16:39 CST
Date: 2/17/77
Time: 16:39 CST
Figure 17c, Tide records
E
.+l,
-301
Location: Causeway bridge pier, Pensacola Beach
Date: 2/19/77
0 Time: 09:00 CST
Date: 2/20/77
Time: 08:19 CST
Hours
Figure 17d, Tide records
C
I >
--10
Lii
Location: Causeway bridge pier, Pensacola Beach
Date: 2/20/77
Time: 08:19 CST
I MSL I I I I 1 I
Hours
Date: 2/20/77
Time: 04:36 CST
Figure 17e. Tide records
+30
+201
E
0
0
I>
ai
S-10
-20
-30
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