Citation
St. Augustine beach nourishment project : Anastasia State Park St. Augistine Beach
1996 Phase I Report

Material Information

Title:
St. Augustine beach nourishment project : Anastasia State Park St. Augistine Beach 1996 Phase I Report
Series Title:
St. Augustine beach nourishment project : Anastasia State Park St. Augistine Beach 1996 Phase I Report
Creator:
Donohue, Kerry Anna
Place of Publication:
Gainesville, Fla.
Publisher:
Coastal & Oceanographic Engineering Dept. of Civil & Coastal Engineering, University of Florida

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Source Institution:
University of Florida
Holding Location:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.

Full Text
UFL/COEL-97/008

ST. AUGUSTINE BEACH NOURISHMENT PROJECT: ANASTASIA STATE PARK ST. AUGUSTINE BEACH
1996 Phase I Report
by
Kerry Anne Donohue and
Robert G. Dean

May, 1997 Prepared for:

St. Johns County, Florida




ST. AUGUSTINE BEACH NOURISHMENT PROJECT:
ANASTASIA STATE PARK
ST. AUGUSTINE BEACH 1996 Phase I Report
May, 1997 Prepared for: St. Johns County
Prepared by: Kerry Anne Donohue and
Robert G. Dean

Coastal and Oceanographic Engineering Department
University of Florida Gainesville, FL 32611




TABLE OF CONTENTS

LIST OF FIGURES ..............
EXECUTIVE SUMMARY ......... 1. INTRODUCTION ..........
2. BACKGROUND ............
3. DATA COLLECTION .......
3.1 Topographic Surveys .......
3.2 Sand Samples ............
3.3 Photographic Documentation . 4. DISCUSSION .................
4.1 Beach Profiles ...........
4.2 Sediment Analysis ......... 5. SUMMARY AND CONCLUSION 6.REFERENCES ...............

................................ 3
................................ 4
................................ 5
................................ 5
................................ 8
................................ 8
................................ 9
............................... 10
............................... 10
............................... 10
. . . 15
............................... 17
............................... 18

APPENDIX A: APPENDIX B: APPENDIX C: APPENDIX D:

BEACH PROFILES: SOUTH SECTION .............. 19
BEACH PROFILES: ANASTASIA STATE PARK ...... 32 SEDIMENT SIZE STATISTICS SOUTH SECTION .... 40 SEDIMENT SIZE STATISTICS ANASTASIA STATE PARK ..................................... 47




FIGURE
1
2 3
4 5 6
7 8 9
10 11
12 13
14 15
16 17 18

LIST OF FIGURES

PAGE
Aerial Photograph of St. Augustine Beach and Inlet .................... 6
Phase I Survey Schedule ...................................... 7
Erosion Rates: St. Augustine Beach South Section .................... 7
Erosion Rates: Anastasia State Park .............................. 8
Profile Locations ........................................... 9
Beach Profiles at Monument R147 C Street, St. Augustine Beach, South Section ................................................ I I
Total Volume of Sand Above NGVD in South Section ................. I I
Total Volume of Sand placed by Dredge in South Section ............... 12
Additional Beach Width since January, 1996 South Section ............. 12
Density of Sand Volume above NGVD since January, 1996 South Section ... 13 Total Volume of Sand Above NGVD Anastasia State Park ............. 14
Additional Beach Width since January, 1996 Anastasia State Park ......... 14 Density of Sand Volume above NGVD since January, 1996 Anastasia State Park .................................................. 14
Grain Size Distribution for St. Augustine Beach R146.3 ............... 15
Mean Diameter of Sand- South Section ........................... 15
Standard Deviation of Sand Size Distribution South Section ............. 16
Mean Diameter of Sand Anastasia State Park ...................... 16
Standard Deviation of Sand Size Distribution Anastasia State Park ........ 17




EXECUTIVE SUMMARY

The following report documents the results of the monitoring of the 1996 St. Augustine Beach Nourishment. Two sites were nourished by the US Army Corps of Engineers in the Spring of 1996, in conjunction with a maintenance dredging project at St. Augustine Inlet,. Wading beach profiles were measured and sediment samples were collected periodically during nourishment and for six months after the initial placement of sand.
The southern site, located south of Anastasia State Park, was nourished first, commencing in February, 1996, and concluding in April, 1996, whereby 1 10,000 m3' (144,000 yd') of sand was placed over a shoreline length of 800 mn (2,600 ft). The northern site, in southern section of Anastasia State Park, commenced nourishment in May, 1996, and was finished in June, 1996. At this site, only 300 mn (1000 ft) of shore line was nourished with 20,000 m3 (26,000 yd 3) The total volume of sand placed at the two sites, 13 0,000 i (170,000 yd 3), was considerably less than the 240,000 Mn3 (314,000 yd&) of sand originally proposed for the sites. The proposed volume was not met due to various factors, including severe weather conditions before and during sand placement, a northeaster which hit 20 days after placement commenced, equipment malfunctions, and the start of turtle nesting season on June 15, whereby it is required that dredging operations cease.
At the southern site, 7 profiles were monitored during the placement phase. After the placement was completed, 4 profiles were added to include the adjacent "spreading out" area. At the northern site, 7 profiles were monitored during the placement phase and for 6 months after operations ceased.
While it was anticipated that the short length of the project would severely limit the longevity of the nourished sand in its initial placement site, the monitoring results indicate that the project is performing much better than anticipated. After 4 months, at least 50% of the sand was expected to leave the area at the southern site. However, 94% was still in the area after 4 months. When the monitoring stopped, 6 months after completion of placement, 68% of the sand was still in the initial segment of beach. At the northern site, the initial nourished beach segment was so small that essentially all the nourished sand left the area before the 6 months. The erosion rate at the northern site is extremely high, on the order of 7 rn/yr (21 ft/yr), as compared to the 1 rn/yr (3 ft/yr) erosion trend at the southern site.
Two factors of the nourishment that are relevant to its performance include the larger sand particle diameter of the nourished sand, and the placement of the material at an elevation higher than mean sea level. These factors seem to be favorably affecting the nourishment's longevity, especially at the southern site.




INTRODUCTION

This report is the first in a series documenting the evolution of beach nourishment at St. Augustine Beach, Florida, (Figure 1). In the Spring of 1996, the US Army Corps of Engineers (USACE) placed approximately 130,000 M3 of beach quality material at two sites on the beach face as a part of a maintenance dredging project of St. Augustine Inlet. This was the first time St. Augustine Beach had an on-shore nourishment project of this magnitude. The quantity was considerably less than the planned 240,000 n3 of sand, as dredging operations were limited by severe weather conditions and dredging equipment malfunctions. These problems caused the sand placement operations to extend over a four month period, from February to June of 1996, significantly greater than the planned one month period. Both sites were monitored every four weeks during placement and for a six month duration after the dredging and pumping operations ceased, (Figure 2). The USACE plans to repeat the maintenance dredging/beach nourishment project in 1997. This monitoring study involved topographic surveys and sediment analysis at the two sites. The proposed study is planned to continue for another year. Nourishment during the Fall, 1997 is being considered.
2 BACKGROUND
The nourishment areas have many interesting facets. Before the present St Augustine Inlet was cut and stabilized in the 1940's, a natural migrating inlet existed. The presence and maintenance of the stabilized inlet has stressed the study areas, which are located between 5.8-8.8 km (3.5-5.2 miles) south of the inlet. Approximately 900,000 m3' of material has been dredged from the inlet since 1970 (USACE, 1990), all of which has been placed in the offshore or near shore region. The 1987 report, Florida's East Coast Inlets, Shoreline Effects and Recommended Action (UFL/COEL-87/0 17) states that the USACE net littoral transport rate estimate in the St. Augustine Inlet area is between 270,000-3 10,000 M3 /year. A wave height rose produced by the US Weather Bureau in Jacksonville shows the dominant waves propagating from the east and northeast. The 1976 St John's County Beach Erosion Study identified two eroding locations in the county's shoreline: one immediately south of the inlet, and the other at St. Augustine Beach. Unsurprisingly, these were the two sites chosen for the 1996 beach nourishment.
The south study area ranged from DNR Monuments R145-R149. The beach at the south site is eroding at an average rate of 1. 16 rn/year, since the construction of the stable inlet in the 1 940's. (Figure 3) The site has been identified consistently as an eroding beach. The USACE 1977 Feasibility Report for Beach Erosion Control in St. John County mentions the 4 km (2.4 miles) stretch of beach in front of St. Augustine Beach as one characterized by an erosional trend. The erosion is mainly caused by the federally maintained inlet 6.5 km (4 miles) north. The portion 2.8 kmn (1.7 miles) north of A St. (126 in south of R146) to 1.3 km south of A St. is in an initial stage of advanced erosion. The remnant of a smaller revetment, extending from the edge of a large revetment at the north end of the site, to A St, was visible in January, 1996. It was buried by nourished sand initially. However, it became exposed again in October, 1996.




Filled: from 5/10 to ) 15 Final Length: 10m
SRock Reiclment
fourishment Area til Filled: from 2/20 lo 4/28 Final Length: 842m

Figure 1: Aerial Photograph of St. Augustine Beach and Inlet (taken 11/88)




Figure 2: Phase I Survey Schedule

January 1, 1996
South
March 1
Northeaster 3/10-3/12-0'South Survey
May 1 South Survey
North
Nourishment
Began
.o t o~ ............. ... ....i "i 0North & South Jl
Survey
N orth & Sout .... ....................
Survey September 1

North & Survey

South
November 1

. ......................................................... Pre N ourishm ent
Survey: North and
-February 1 South
S South Nourishment Began
. ........................................................... South Survey
l April 1
.South Survey
South Nourishment Ended
June 1 -O ................. ................
NorthNorth & South
N o rth Survey
Nourishment
- Ended
........................................................... N orth & South
August 1 Survey
........................................................... N orth & South
i October 1 Survey
QDecember North Survey

EROSION RATES: ST AUGUSTINE BEACH: SOUTH SITE

600
U
I- 500
z
w
Z 400
0
300
0
LL LU
0 200
z I
U)
- 100

0.

0*
A.~. ..... ....... o
1950 1960 1970 1980 19
YEAR
Figure 3: Erosion Rates at St. Augustine Beach: South Site




There is a 670 revetment separating the two nourishment sites. This revetment, constructed in 1964, was extended 550 mn to the south in 1975, with coquina rock. The revetment was extended approximately 30 mn again by a private property owner to its current configuration. This places the revetment's south edge at 156 mn south of R145, which was the north edge of where the nourished sand was initially placed at the south site .
The north nourishment site is Anastasia State Park, ranging from monuments R139-R141. It experiences 7.36 rn/year of erosion, (Figure 4). Rip-rap is scattered on the beach, located approximately 30 meters seaward from the baseline set for this study (baseline is approximately the vegetation line). The rip-rap is more consolidated in the southern end of the park. Rip currents are known to be common in this area, as the discontinuity of the shoreline causes waves to build up in this area (Olsen, 1988).
EROSION RATES: ANASTASIA STATE PARK 1000
goo -* R138 UL A R139
80 R140
LL 700 V -g
AVERAGE SLOP/ ~
LL 300
Q0200NA
Z 10 -----0
1950 1960 1970 1980 1990
YEAR
Figure 4: Erosion Rates at Anastasia State Park
3 DATA COLLECTION
3.1 Topographic Sury
A standard survey level was used to determine the elevation, while a 100 mn tape measured distances seaward. A compass was used to establish the azimuth of the profile lines. Mobilization of a boat for offshore soundings would have increase the monitoring costs substantially, and was not justified considering the reduced accuracies attainable by sounding and the small nourishment volumes placed. At the south nourishment site, 12 profiles were surveyed each visit. These profiles are presented in Appendix A. At the Anastasia State Park site, which was nourished later, 7 profiles were monitored on 7 dates. These profiles are




presented in Appendix B. The locations of these profiles are illustrated in Figure 5. Each profile was surveyed to wading depth, unless pumping operations prevented entrance to that section of the beach. Initially, the surveys were scheduled around low tide. However, during the days in which both sites were surveyed, time permitted only one of the two surveys to be performed during low tide. This affected the length of the profiles, as the tidal range fluctuated 1.5-1.75 meters. The gentle slope of the beaches made this wide tidal range even more pronounced. Also, the "wading depth' was a function of the wave climate, which varied from mild to severe throughout the year.
R139--a140 --Anastasia State Park
---- ------ (North Section)
Ri141 -------- )m.Armnored
R142 Shoreline N
Fishing
Pier+
R 145 -- ----R146A --r------ St Augustine Beach
R147A --- ----- (South Section)
R148
R149 -------- Surveyed Profile ]Locations
Shore Baseline
Figure 5: Profile Locations
3.2 Sand Samples
At a minimum, one sediment sample was collected during each survey at the waterline from the profiles where the DNR Monuments were located. On occasion, samples were collected at 20 meter intervals along the profile. The samples were dried, split, weighed, saturated in water for 24 hours, and the size characteristics determined by a Rapid Sediment Analyzer (RSA), an apparatus developed by the University of Florida Coastal Engineering Laboratory The apparatus makes use of the particles' settling velocities to determine the sediment size distribution. Periodically, sediment samples were compared with sediment size distribution data obtained by the traditional sieving method, and the mean diameters fell within 0.01mm. Over 100 samples were analyzed. These data are presented in Appendices C and D.




3.3 Photographic Documentation

Both color and black and white ground photography was used to visually document changes in the beach as the nourishment evolved. In the southern section, photos were taken in a panoramic sequence at an elevated position approximately 50 meters north of R147, close to the center of the nourishment, and at critical locations in the nourishment placement process. In Anastasia State Park, sequential photographs were taken at Ri41. The reader may contact the authors regarding the availability of the photographs.
4 DISCUSSION
The beach profile and sediment data are discussed briefly below, with all results found in the appendices
4.1 Beach Profiles
During the 1996 project, the sand was pumped hydraulically on to the berm, which was approximately 2.5 m above NGVD. Figure 6 is an example of a profile in the center of the south section nourishment site, R147. This is the standard shape of the profiles measured inside the nourishment area. Interesting variations in the data occur when the profiles are compared to the January pre-nourishment profiles. The baseline for this section was established at a 0 degree azimuth line, commencing from a beach walk over piling, as a replacement for R148 (which was missing). The profile lines followed a 85-90 degree transect towards the Atlantic Ocean. Figure
7 clearly shows the progression of the sand being placed on the beach until May 2, when placement was finished. After May 2, the sand in non-equilibrium quickly disperses to the adjacent beaches. This "spreading out" loss remains constant until September, when both inside and outside the nourishment area experience volume deficits.
Note that Figure 7 only includes the sand volumes above NGVD. Various approximation methods were investigated to extrapolate the short profiles, so the fluctuations of sand volumes in the surf zone could be compared between each survey. However, a satisfactory method was not found. Thus, while the above NGVD volume and density figures presented are accurate, sand bar formation and dispersion below NGVD is only displayed in the profile plots of Appendices A and B. Figure 8 is the cumulative amount of sand the dredging company emptied from the hopper dredge at each survey date. The sand normally was hydraulically pumped from the hopper onto the beach. The dredger's final volume was approximately twice the above NGVD volume calculated by the surveyed profiles. The sand not accounted for was either below NGVD, or was carried away by longshore or cross shore transport processes.




147 C Street South Section
-0- Jane
- -- Feb24
3. .... ... 01... -92
3 .0 . . . . . . . . . . .. . . . . . . . .. . . . ... : . . .l a r; .
2 .5 ........ . .". . . ...... ... ... ..... A- Pr2o "!"
:'. !---... ..
2 .0 .. .. .. .. ...... ............ ............ ........ ..
1.L
1.5 ........ ..... .. .. .. . ..- .... J M ... 7..
-0 .5 ........ . ............. ......
. ..... ... i r. .
10
0 20 40 60 80 100 120 140 160
Distance Seaward(in)
Floure 8 : Beadh Profiles at DNR Monument 147a C St.
Total Volume of Sand above NGVD South Section Since January. 1996 St Augustine Beach Nourishment 1996
CD0
ini
- itMarnch Noheaar-_ L ... .......... .. .... ... N ... . .. ..
C"
70 ....
- 0 o -. .. ........ ::= = ... ... . ................ .. ..... .......... sl ........ .. ...... !.................
4. 0 . -; ... .... . . . ..i.... ... .......... ... .... .... .. .. .. ... . ..
20 .......8......
D 50 100 150 200 250 3o
Days Since Start of Nourishment Figure 7: Total Volume of Sand Above NGVD In South Section
On May 2, 5 days after the south nourishment operations ceased, the additional beach width in the nourished area ranged from 27 to -26 meters. Figure 9 shows how the additional dry beach width fluctuated as the nourishment evolved. Figure 10 illustrates the movement of the nourished sand in the cross sections of the profiles, above NGVD. Both Figures 9 and 10 indicate an erosional hot spot in the RI 48-RI 49 region, just outside the nourished area. However, a closer look at profiles R148-R149 in Appendix A indicate that the January 9 profiles were unseasonably high. Since all profiles are compared to this pre-nourishment profile, it appears as if this area is an erosional hot spot.
11




Dredging Records
Sand Collected by Hopper Dredge ... ..0 .............. ::. ... . ............ . . ... .......... 6 f h r . .
o .......... ................ ............ ....... ..................... .nis h e ........
-0 0 ......
0 . . . . . . . . .. . . . . . . . . . . . . . . . ... . i . . . . . ... . . . . .
o50"
..................................... ... ....
0
r 0 ... .0 .50. 60 70
10 Since St shment
Figure 8; Total Voture of ,Sg nd .Collected by Dredge Inrsutm action
Additional Beach Width since January, 1996 South Section [- eb 24
I : + ...........i '.....-- ---.....
30~~~ ~ ~ Ferarar29 ..... ... ....... ..... .......... .............. ........... ........ .......... " ".e ............
20
- t 10 ....... '. . . . ........ ..... .......... i ....... .... .. .. .. ... .. .. ... .. .. .... ..........
02 0 20 30 40" 50: 0 70
NEyd fNcu sh art of een..i .
-:30 .. U.. ......r"'""" "'i euth eet
-40 "R145 R1..... F;46A"..... R1,47A' ...... I" 1;4BA .R149
, i I i i i i i
0 200 400 600 800 1000 1200 1400
Distance South from R145 (in) Figure 9; Additional Beach Width Since January, 1996 In South Section
It is interesting to note that the northern end gained more from the "spreading out losses", which could be explained by waves propagating from the south, typical in the summer months when those surveys took place, or could be due to the presence of the revetment projection at the north end.
12




Density of Sand Volume, Since Januar 1996 South:Section -- Fb24
E 160 .. .... .. ........ ............. ..... ...... ........: .............. .. M'",,' ..
1 .....................
14 0 .............. ...........
a~may
} 1 ( . .......... ........ .... : ................. . / : ................ O 1 . .
120.. ...- ....
.100 ......
. .. ............ ......-... .. .. 0 u
... 40 .: ........:.. ......_."".. ....... ........ .. ..... .....*........
o= 80 F:i, sop :
o 0
. 20
K"14

"O...
0 200 400 600 800 1000 1200 1400 Distance South from R145 (m)
Figure 10]: Density Sand VoIlime, Since January, 1996 in outh Section
A severe northeaster hit the region from March 10-13, 1996. The north Florida Atlantic coast experiences a typical March significant wave height of 0.5 meters. However, from March 10 to March 13, waves were ranging between 1.0- 2.1 meters. The storm halted beach pumping operations for over 2 weeks. The effect of the storm is evident in all the March 29 profiles, and in Figures 9 and 10 which vividly display the sand lost. During the 20 day interim between surveys, Figure 7 shows how 14,000 m3 of sand was lost above NGVD, even though the dredger's log indicates that 11,000 m' was placed on the beach in that same 20 day interim.
Anastasia State Park received much less sand than planned by the USACE. The sand was placed between May 15 and June 15, when the dredging/pumping activity ceased due to the onset of the turtle nesting season. Most of the sand was placed between R140 and R141. Figure 11 illustrates the evolution of the total volume of sand inside and outside the initial sand placement area. The presence of the rip-rap in the swash and surf zone consistently caused difficulty in documenting the presence of any sand bars. Thus, only above NGVD data was considered for the park site. The additional dry beach width in between these two monuments on June 29 (14 days after nourishment completion), ranged from 6 to 24 meters, seen in Figure 12. There appears to be a minor nodal point and/or erosional hot spot at R139.7, which is evident both in Figure 12, and in Figure 13, which displays the density of sand volume.
13




Total Volume of Sand above NGVD
in Anastasia State Park
1 4 . . . .. ... . ....... . .. : .... ..... .. .. . !. . . . . .
in ~ Anastasia AMt Pr
14
80 . . . . . . , . . . . . . . i . . . . . . . . . . 5 . . . . . . "
..... ...= ... ......... ......,...... .......... .
-:3 4 . ..... . .. ..
*02
:: i i i i
CO
CO)
0
< -2 i &I9 ,iR4 I4
0 20 40 60 80 100 120 140 160 180
Days Since Start of Noushrment
Figure 1: Total Volumre of Sand Above HGid since January, 1996 in Anastasa State Park
Additional Width of Beach, Since January, 1996 Anastasia State Park
4 0 ........... ....... ...............
0, -4 JLMe29
3 -. ,uCD 2 ............. .............. ............ ...... ...... ..............
70
.. .. .. D oc. .. 1. i ..... . . . . .
''b
0 0-- < 0 ........
i ....... ... .. .... .. . . - -.
0 -10 ..... ".. . . . .
- o ........ i ......~..... r ......... .............. i ...... ............... :r 4
R139. R140 R111
-100 0 100 200 300 400 500 600
Longshore Distance South from DNR139 (m)
Figure12*- naljeavbidtb ince .January,1M
Figure ~ 1:ifR sta stat ant ,i
Density of Sand Volume, Since January, 1996 Anastasia State Park
E 80
70 .. ..... ....e.i...... ...
-A 0m29
.. . . . . . . .
0 30 ... uy2
E0AW2
.. . .. . . .
C20
: -10 0 10 0 30 4000 0
< Longshore Distance South from DNR139 (in)
Figure 13: Density ofl Sand Volumne Sice January, 1996 In Anastasia State Perk




4.1 Sediment Analysis
For the southern site, the average mean diameter of the native beach sand was 0.18 mm, while the average mean diameter of the fill material was 0.35 mm (Figure 14). The larger beach fill diameter should enhance the longevity of the project. The sand collected during the placement phase (February-May) have the largest mean diameter (Figure 15). As time progressed, the sand became well sorted, with the mean diameter fluctuating around 0.18 mm, the native mean grain size. In Figure 16, the varying standard deviations at R145 and R148A indicate that the nourished sand is slowly progressing into those border areas. In all other areas, the sand is medium to well sorted.

Grain Size Disitbution for St. Augustine Beach R146.3

Grain Size (mm

Figure 14: Grain Size Distribution for St. Augustine 1996 Beach Nourishment: Native and Fill Sediment Comparison

Mean Dian
0.52 .
0.42 ........
0.32
"' IX

0.22 t-

meter of Sa
South S
x
X
.. . . . . i "

0

146A
.... 46.A.=

A
* *~1~
A

R1 R14

nd, South Section section Fb 2V
A.. M.m- 9 Wl.
* Mot, a29 W SApi 20W L V M.Y2 Vl 0 Jn I V4L ................. u 28 Vd= '.
* 0 J* 25 V& .0 A22 V&L
SW22 V&
*iO r Oe27WL N"tv snd A,9 so. ... ........... ,. I J n l n
X Frb 24Gnm
-- Mind 29 Bern
* z A'92D B..
WL x Water Line
47A R148A R149

12

0 200 400 600 800 1000 1200 1400
Distance South from R145 (m)
Figure 15: Mean Diameter of Sand in South Section

, H I




Standard Devia
South Secti

:X
. .. ............. ...................
-: ................ ................ ..'
. ....i ........... ..- ....... .. .
: .
R146

tion
on

Native San
a
R147A R148A

* Feb 24 VWL A MuwchS0V&
R Mamh 29 WL
* Apr oWL
V May 2 v t
L Juwe*28WL
o Juy 2z WL
0 Aug 22 WL
V Sept 22 WL
+ Oct 27 V. I Jan Berm
X rob 24 nm
- March 2 Senm
S ApdIl 20 Bm
WL-W ter tine
........ 9.... ...

U.' n n n

0 200 400 600 800 1000 1200 14
Distance South from R145 (m)
Figure 16: Standard Deviation of Sand Size Distribution in South Section

In Anastasia State Park, the native mean grain size diameter was 0.175 mm. The mean diameter varies more at R141, in the nourished area. However, with the exception of the R141 June 28 sample, all samples are well sorted, ie., have standard deviations less than 0.5. The influence of the nourished sand size distributions at the park is minimal because of the small amount placed.
Mean Diameter of Sand, Anastasia State Park

0.23
S0.22
E
E
S0.21
E 0.20 0-.1
e- 0.19 C,

0.18 V

_ . . . .

SNative Sand JangesBm
A Junm 1 WL S Jume 2WL J Juy 25 WL
7 Aug 22 w1. ... . .............. :. ........ O W s p 22 V
0 Sep22WL A Od.27W1. ......O...... Dec I WL
: WL = Water Line:
.. . .. . A.... . . . . . .. . . .

0.. . . . .. . . . .
R V R .. ....

I
......... .. ........

B

0
A
V
A

.41

. ,
-100 0 100 200 300 400 500
Distance South from R139 (m)
Figure 17: Mean Diameter of Sand in Anastasia State Park

3.0 r

2.5 r

i

I I H I I . .

1-

- .

J I n n 1 m

UL

00




Standard Deviation, Anastc,
Native Sand

WIL =Water Line
0

Ri 39

S
0

R140

0.7[
0.6

R141

-100 0 100 200 30D 400 500 600
Distance South from R139 (in)
Figure 18: Standard Deviation of Sand Size Distribution
in Anastasia State Park

5 SUMMARY AND CONCLUSION
In conclusion, it is evident that the nourished sand on the beach is providing a significant measure of protection. The small volume placed and the short nourished beach length will severely limit the life span of the project. While both sites in general had short nourished beach lengths, when comparing the two sites, the longer south section is retaining the original volume considerably better than the shorter Anastasia State Park site. This scenario reinforces the trend of increased longevity with nourished beach length; however, this interpretation is complicated by the difference in background erosion rates: 7 mlyr at the northern site, verses 1 mlyr at the southern site. If the characteristics of the south section nourishment (deep water wave height and group speed, shoreline orientation, vertical length of nourished sand in profile) are considered, the expected half life of the nourished sand is on the order of 4 months. However, as of the last survey, 68% of the nourished sand was still in the initial beach segment. At 4 months after construction, 94% of the nourished sand was still in the initial beach segment. The increased longevity is attributed to the coarse sand fill, and the placement of sand at a considerably high elevation on the beach profile. The effect of the these two factors is a subject needing further documentation and analysis.

tsia State Par k
*~m .ii28WL V Aug 22 WL o SW 22 V& A d 027 V&
0
. . . . .

I-

a 0.5
0
C1 0.4 'V
S0.3

-L




6 REFERENCES

Florida Coastal Engineers, Inc.. "St. Johns County Beach Erosion Study" Jacksonville, Florida 1976.
Olsen Associates, Inc.. "Shoreline Restoration Study. Anastasia State Recreation Area St. Johns County, Florida". June 1, 1988. #NR-871 01011.
U. S. Army Corps of Engineers, Jacksonville District. "St. Johns County Beach Restoration Management Plan". 199?.
U. S. Army Corps of Engineers, Jacksonville District. "Feasibility Report For Beach Erosion Control. St. Johns County, Florida. 1977.
U. S. Army Corps of Engineers, Jacksonville District. "St. Johns County, Florida, Beach Erosion Control Project", 1990.
War Department: Beach Erosion Board, Washington, D.C.. "Report on the Effects of Proposed Navigation Improvements on Adjacent Shore Lines at St. Augustine, Florida". 1947




APPENDIX A




145 In Front of Revetment (Outside Nourishment Area)
St Augustine Beach: South Section

* Ii
I j .1
. .
LII
IA

--- - -- -- - ----- ---

I I

100

7 _.- .,..'.'.'.0 .-......_... ........ 0
I I I

120

140

160

Distance Seaward (in)

0 January 9 (estimated)
--A-- June 1
--- June 28
.. .. July 25
7 August 22
J[+ September 22
.... O October 27

C
(D
z
C
0
Lu

20

40

60

80




145.3 -On Stoop in Front of Revetment

(Outside

E
(D
z
0
.

Nourishment Area)
r 'l . . . . . . . . .... . '

20

40

60

St Augustine
.0

80

100

Beach: South
-J
--A-- j
--D-- J
V

120

140

Section

160

Distance Seaward (m)

anuary 9 (estimated) une 1 une 28 uly 25 ugust 22 September 22 October 27

-. .- - - -- . .- .- - -

I




145.6 Edge of Revetment

St. Augustine Beach:
... .. .. .. -- -- -- --

i

40

60

SoL

-\ \

80

100

ith Section
, .. ..... .. .. ..

120

Distance Seaward (m)

z
(
0
(5.
CU
aU

0 January 9
A .... February 24 S-March 9
-"-- March 29
- V- April 20 -'O-. May2
--/- June 1
-- June 28 . .... July 25
-August 22
-I+- September 22 ........ October 27

20

140

160

S .

..........




145.75
4

E
(9
z
0 i)
UJ

South Edge of Revetment and Nourishment
St. Augustine Beach: South Section

- - - - - - - - -
-- -- ---7--" "

* *

--- -- -- -- -- -- -- --

I -

60

O- ---
0

80

100

120

Distance Seaward (in)

January 9 February 24 March 9 March 29 April 20 May 2 June 1 June 28 July 25 August 22 September 22 October 27

20

40

140

160

... .i i iI rI

I I I I I

I

. . . . . .

- - - - - -

P




146 Beside 2 Story White Slate House

St. Augustine Beac

20

40

60

:h: South

80

100

Section

120

Distance Seaward (m)

A
I --------

E
(.9
z
4
0
o >1 uI

--- - - - - - - - - -
... . . . . . - - - - -
..............

140

160

I 1 , , 1 1

January 9 .... .... February 24
S-March 9
- March 29
Y~ April 20
"-'O-*" May2
--A-- June 1
---F- June 28 .. July 25
- August 22
-I+ September 22 .0 .... October 27

V _

---------------................

.............
. . . ... .

-------------

r




146.3 A Street
St. Augustine Beach: South Section
- -. - - - - - - - - - - --- - - - - - -. . . . . . . . . . . . ..
!
-- --- - . . .

20

40

60

80

100

120

140

Distance Seaward (in)

0*
E
(9
z
C
0
w

-January 9 .... .... February 24
March 9
- March 29
- April 20
-O- May2
--A-- June 1
---- June 28 0 .... July 25
7 August 22
I, September 22
.... October 27

A
A
-S

160

- - - - - -




146.7 B Street St. Augustine Beach: South Section
5
0 January 9 (estimated) 4- - --- - - - - . . .. A . February 24
- U March 9
* March 29
3 April20
~O" May 2
--A--Junel1
>2 -L June 28
CD.... July25
- ------- August 22
+ September 22 O" October 27
-2 0
0 20 40 60 80 100 120 140 160
Distance Seaward (in)




147 C Street
St. Augustine Beach: South
' -- -- -- - -
- - - - - - - - -

--- - ; '
. . . - - A - O-
- - - - - - - - - - -

3.0 2.5

60 80 100
Distance Seaward (in)

Section
January 9
A.. February 24
- U March 9
+ March 29
S April 20
0 May 2
-- --- -- -- June 1
--D June 28
-- -- -- -- -- . July 25
V August 22
............. September 22
0... October 27
A

(D
z
0

2.0 1.5 1.0 0.5 0.0
-0.5
-1.0
-1.5

20

4(

120

140

160




Dune Walk-Over with Platform

St. Augustine

0 .

4*

Beach: South Section

4

0
E
(9
z
0
a)
W
ci
w

80

100

120

Distance Seaward (in)

147.5-

i I I

0 January 9 (Estimated)
A.... February 24
- -U-March 9
--- March 29
- April 20
.-- May2
--Af-- June 1
--]-- June 28 .. July 25
- August 22
-+- September 22 O .... October 27

20

40

60

140

160

- - - -

............




148 Dune Walk-Over

St. Augustine

Beach: South Section

- - - - -

40

60

80

100

120

Distance Seaward (in)

E
(D
z
0
LU

January 9 ... February 24 U March 9 ~ March 29 SApril 20
*-*O-*May 2
--A-- June 1
--EL--June 28 ....* July 25
-V---August 22 ~F September 22
0.... October 27

20

140

160

---- ------ --- -- ------




148.5 Dune Walk-Over (Outside Nourishment Area)
St. Augustine Beach: South Section

-- -- ---- --

I I I I

0 20

40

60

80

100 120

140 160 180

Distance Seaward (m)

E
(.
z
0
W

0 January 9 (estimated)
--A-- June 1
-- June 28 . .... July 25 S August 22
+ f, September 22 ... O. October 27

I i I I

...........




Dune Walk-Over (Outside Nourishment Area)

149

Beach: South Section

V

0 20

40

60

80

100 120 140 160 180

Distance Seaward (in)

St. Augustine

E
0
z
C
0
4.0
C
a)
LU

@ January 9 (estimated)
--A-- June 1
----- June 28 .. July 25
7 August 22
+ September 22
O .... October 27

- - - - . .

D-4-

- - - -




APPENDIX B




R138.7 -

Anastasia State Park

St Augustine 1996 Beach Nourishment Project

Jan9
-- Junl
- Jun29
SO-- Jul25 --/ Aug22
--El-- Sept22 ........... O ct27
-- Dec1
EI I

140

Distance Seaward (m)

E
z
C
0
,a)
W

Ilk.

20

40

60

80

100

120

160

, ................







R139.3 -

Anastasia State Park

St Augustine 1996 Beach Nourishment Project

N
N
N

-Jan9
---4--- Junl
- Jun29 -O-- Jul25
----- Aug22
--0-- Sept22 ........... O ct27
--4-- Dec1
-. - -. -. -. - - - - -. -. - - . . . . . . . . . . . .

l

I I

60

80

100

Distance Seaward (m)

2.0

-

1.5 1.0 0.5 0.0

E
(.
z

U])
LU

K>

-0.5
-1.0

N
NE2.

20

40

120

140

160

i i I

I

l



i I




R1 39.7 Anastasia State Park
St Augustine 1996 Beach Nourishment Project

2.5

- - - -

20

.,,5'
.4k
. . . . . . .. ..
.. . . .. .. .. .

1.5
E
(9 z 0.5
0
LJ -0.5

I I

40

60

80

100

120

Distance Seaward (in)

4 January 9
---+--- June 1
-T- June 28
.O" July 25
--- August 22
-E- September 22 ........... October 27
- ---- December 1

~..........

-1.5

140

160

-- - - -

]

.. ... .. .. .. .

I




R140 -

Anastasia State Park

St Augustine 1996 Beach Nourishment Project
-Jan9
- -- Junl
- F -Jun29
-A- Jul25
.... .............. . . ........ ... ..- A u g 2 2
, -D Sept22
.......... O ct27
--+-- Dec1

I I

20

40

60

80

100

120

140

Distance Seaward (m)

C
(.5
z
0 a)
=u

160

I ~ ~~ i I i

-. .. .. .. .. . ... .. .. .. .

I

S I




R140.5 Anastasia State Park
St Augustine 1996 Beach Nourishment Project

- - - - ----- i \*.. \
I I I

20

40

60

L
I I

80

Distance Seaward (in)

z
a
ED

January 9
- June 1
- June 28
0" July 25
------ August 22
---- September 22
........... October 27
--+ December 1

V

100

I I

120

140

160

.........




R141 Anastasia State Park
St Augustine 1996 Beach Nourishment Project

- - - - - - - . . .

E
0
a

-- -- -- -

100

120

140

Distance Seaward (in)

*~1111

.... . .. .

20

40

60

80

160

p January 9
* June 1 T June 28
0.. July 25
--A--August 22
- L1 -September 22 ........ October 27
~+ December 1

..........

...........




APPENDIX C




Mean Diameter of Sand, South Section St Augustine 1996 Beach Nourishment

X
x
X
.....* i. . .. ..

0.52

200

4
E
+ C R146A

-I

R147A R148A
I, I

400

600

800

1000

* February 24 WL
A March 9 WL
U March 29 WL
S April 20 WL
V May 2 WL
o June 1 WL
A June 28 WL
II July 25 WL
S August 22 WL
V September 22 WL
S October 27 WL
- I January 9 Berm
X February 24 Berm
- March 29 Berm
April 20 Berm
WL Water Line

R149

1200

1400

Distance South from R145 (m)

Native Sand

0.42 0.32 0.22

E
E
L-.
a)
E
Co
a)
2D

x
145

F
0.12

I I I II II I II




Median Diameter: South Section St Augustine 1996 Beach Nourishment

0.6

0.5
E E 0.4
a) E 0.3
0.2

x ,145

R146A

200

R147A
I I

400

600

Native SandR148A

800

1000

* February 24 WL
A March 9 WL
* March 29 WL
* April 20 WL
V May 2 WL
o June 1 WL
A June 28 WL
l July 25 WL
K August 22 WL
7 September 22 WL
- October 27 WL
-1 January 9 Berm
X Feb 24 Berm
-- March 29 Berm
April 20 Berm
WL = Water Line
R1:49

1200

1400

Distance South from R145 (in)

I I r I I I




Standard Deviation of Sand Size Distrubution, South
St Augustine 1996 Beach Nourishment,

3.0
2.5
0
-I 2.0
a
1.5 C 1.0 C/)

0.5 0.0

- x

+R145 S,145

R146A

200

. ---- - ,--
,
R147A

400

600

Native Sand
A
0
R148A

800

1000

0
A
0 VA El
7
x
)K

WL = R14

120C

Section

February 24 WL March 9 WL March 29 WL April 20 WL May 2 WL June 1 WL June 28 WL July 25 WL August 22 WL September 22 WL October 27 WL January 9 Berm February 24 Berm March 29 Berm April 20 Berm

Water Line
1400
S 1400

Distance South from R145 (m)




Comparison of Mean Diameter Along the Profile March 29, 1996
0.36 ... R146.3: Sand Pumping in Progress
0.34- -------........- --------- ---- R146.7: 3 Weeks After Nourishment
---B--R147: Not Yet Nourished
10 0 3 2 - - - - . .-- - - -- - -.. .- -- -- -- -
E
E 0.30 ---
S0.28
E0.26
05 0.24
- - - - 0 2 2- - - -- -
S0.20 -- --- -- -- W ater-Line
0.16 I I I II
-110 -90 -70 -50 -30 -10 10 30
Distance Seaward from Water Line (in)




Comparison of D50 Along the Profile
March 29, 1996

0.40 0.38
0.36
E
E 0.34 ..p0.32
a)
C- 0.30 ,00.28 Lo 0.26 CO 0.24 4a 0.22
a)
E 0.20 iU 0.18
0.16

.............. /

----- -- /-

. . . . .i. . . . .

.4

.... R146.3: Sand Pumpi
- --- R146.7:3 Weeks Af R147: Not Yet Nouri,
. . . . . . . . . . . . . . . . . . . . .- --Water Line:- ---

I I Ii

-90

-70

-50

-30

-10

Distance Seaward from Water Line (m)

ng in Progress ter Nourishment shed

-110

30

-- - --- -

i




Comparison of

Sediment Standard Deviation Along the Profile

March 29,

1.0 0.9 0.8
0 .L 0.7 0.6 :0.5 Ul)
0.4 0.3
0.2

-90

- - - - -
- - --- -

-70

-50

1996

Water Li

-30

rl

-10

-
- - - -
e:

10

30

Distance Seaward from Water Line (m)

...... R146.3: Sand Pumping in Progress A R146.7: 3 Weeks After Nourishment
---- R147: Not Yet Nourished

- - -
. . . . . .
- - - - - - -
-- - - -- . I ./

-110

I I I / I I I
I
9,,
I
I .1
I I.




APPENDIX D




Mean Diameter of Sand, Anastasia State
St. Augustine 1996 Beach Nourishment

0.23

@6

300

Native Sand
V 0
A
E :WLA

0.22 0.21 0.20
0.19 0.18

E
E
a)
-4
E
M
C) t-

100

200

Water Line
S

R

400

500

Distance South from R1 39 (in)

I

January 9 Berm June 1 WL June 28 WL July 25 WL August 22 WL September 22 WL October 27 WL December 1 WL

R9
I

I I

Park


A 141 ..

600

0.17

-100




Median Diameter, Anastasia State Park St Augustine 1996 Beach Nourishment

Native Sand
D- -.

0.24 0.23 0.22 0.21 0.20 0.19 0.18 0.17 0.16

R139

100

Distance South from R1 39 (in)

* January 9 Berm -4
A June 1 WL
U June 28 WL
* July 25 WL
V August 22 WL
O September 22 WL
A October 27 WL
LII December 1 WL

E
E
E

Water Line::
0
A
0 0
F. - - - - - - -- .

.W

.JL

-. . ..- -

R11
LI

-100

R140

200

300

I I

400

500

600

I I

.




Standard Deviation, Anastasia State Park
St. Augutine 1996 Beach Nourishment

Native Sand

WL = Water Line . . . . . - - - . .- . . . .
A
R139

100

104 January 9 Berm
A June 1 WL
* June 28 WL
* July 25 WL
V August 22 WL
O September 22 WL
A October 27 WL
l December 1 WL

A
R140

200

300

400

500

Distance South from R1 39 (in)

0.7 0.6

R..... .41.....
R141I

0.5 0.4 0.3

0.2

-100

600

- - - -