Citation
Beach monitoring project, Sand Key phase II beach nourishment program (North Redington Beach and Redington Shores) post-nourishment report

Material Information

Title:
Beach monitoring project, Sand Key phase II beach nourishment program (North Redington Beach and Redington Shores) post-nourishment report
Series Title:
UFLCOEL
Uncontrolled:
Sand Key phase II beach nourishment program (North Redington Beach and Redington Shores) post-nourishment report. Part II, Offshore profiles and wave data (survey of July 19-25, 1989)
Creator:
Lin, Li-Hwa
Dean, Robert G ( Robert George ), 1930-
University of Florida -- Coastal and Oceanographic Engineering Dept
Florida -- Dept. of Natural Resources. -- Division of Beaches and Shores
Pinellas County (Fla.)
Place of Publication:
Gainesville Fla
Publisher:
Coastal & Oceanographic Engineering Dept., University of Florida
Publication Date:
Language:
English
Physical Description:
1 v. (various foliations) : ill. ; 28 cm.

Subjects

Subjects / Keywords:
Shore protection -- Florida ( lcsh )
Beaches -- Florida ( lcsh )
Beach erosion -- Florida ( lcsh )
Coastal and Oceanographic Engineering thesis M.S
Coastal and Oceanographic Engineering -- Dissertations, Academic -- UF
Genre:
government publication (state, provincial, terriorial, dependent) ( marcgt )
non-fiction ( marcgt )

Notes

General Note:
"September, 1989."
General Note:
"UFL/COEL-89/016"--Cover.
Funding:
This publication is being made available as part of the report series written by the faculty, staff, and students of the Coastal and Oceanographic Program of the Department of Civil and Coastal Engineering.
Statement of Responsibility:
by Li-Hwa Lin and Robert G. Dean ; prepared for Pinellas County and Division of Beaches and Shores, Florida Department of Natural Resources.

Record Information

Source Institution:
University of Florida
Holding Location:
University of Florida
Rights Management:
All rights reserved, Board of Trustees of the University of Florida
Resource Identifier:
20751007 ( OCLC )

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This item has the following downloads:


Full Text
REPORT DOCUMENTATION PAGE
1. Report No. <2. 3. Recipient's Accession No.
4. Title and Subtitle 5. Report Date
BEACH MONITORING PROJECT
KEY PHASE II BEACH NOURISHMENT PROGRAM September 1989
II- Offshore Profiles and Wave Data 6.
(Survey of July 19-25, 1989)
7. Author(s) 8. performing Organization Report No.
Li-Hwa Lin UFL/COEL-89/016
Robert G. Dean
9. Performing Organization Name and Address 10. Project/Task/Work Unit No.
Coastal and Oceanographic Engineering Department University of Florida 11. Contract or Grant No.
336 Weil Hall
Gainesville, FL 32611 13. Type of Report
12. Sponsoring Organization Name and Address
Pinellas County Final
and
Division of Beaches and Shores
Florida Department of Natural Resources 1,4.
15. Supplementary Notes
16. Abstract
This study presents the fifth post-nourishment survey (July 1989) results for the Sand Key Phase II beach nourishment project carried out in June, 1988. The monitoring program to this beach nourishment project is a joint effort between the University of South Florida and University of Florida. The field surveys include a total of 26 profiles, encompassing approximately 3 miles of shoreline extending from DNR R-96 to R-ll1. The total calculated volume loss of sand in the nourished segment (from R-99G to R-107) between the July 88 and July 89 surveys is 63,091 cubic yards, which is a loss about 11.9 percent of 529,150 cubic yards actually placed in the nourishment project. The total loss of sand computed in the entire survey area is 17,003 cubic yards, which is only 3.2 percent of the sand placed in the nourishment project. It is stressed that a part of these net volume reductions is due to the background erosion and not due to spreading losses induced by the nourishment project.

17. Originator's Key Words 18. Availability Statement
Nourishment
Profiles
Survey
Volume Changes
19. U. S. Security Classif. of the Report 20. U. S. Security Classif. of This Page 21. No. of Pages 22. Price
Unclassified I Unclassified P 170




UFL/COEL-89/016

BEACH MONITORING PROJECT SAND KEY PHASE II BEACH NOURISHMENT PROGRAM (North Redington Beach and Redington Shores) Post-Nourishment Report PART II Offshore Profiles and Wave Data (Survey of July 19-25, 1989)
by
Li-Hwa Lin and
Robert G. Dean
Prepared for:
Pinellas County and
Division of Beaches and Shores Florida Department of Natural Resources

September, 1989




BEACH MONITORING PROJECT
SAND KEY PHASE II BEACH NOURISHMENT PROGRAM
(North Redington Beach and Redington Shores)
Post-Nourishment Report
PART II Offshore Profiles and Wave Data
(Survey of July 19-25, 1989)
Submitted to: Pinellas County and
Division of Beaches and Shores
Florida Department of Natural Resources
by
Li-Hwa Lin
and
Robert G. Dean Department of Coastal and Oceanographic Engineering
University of Florida Gainesville, FL 32611

September, 1989




BEACH MONITORING PROJECT
SAND KEY PHASE II BEACH NOURISHMENT PROGRAM
(North Redington Beach and Redington Shores)
Post-Nourishment Report
PART II Offshore Profiles and Wave Data
(Survey of July 19-25, 1989)
Submitted to:
Pinellas County and
Division of Beaches and Shores
Florida Department of Natural Resources
by
Department of Coastal and Oceanographic Engineering
University of Florida and
Department of Geology
University of South Florida
PART I Beach profiles (USF Separate Report)
PART II Offshore profiles and wave data (UF)
PART III Sediment analysis (USF Separate Report)
PART IV Shoreline maps (USF Separate Report)

September, 1989




TABLE OF CONTENTS
page
INTRODUCTION......................................1
ADVANCED SUMMARY................................ 3
PURPOSE...........................................3
SURVEY AND REPORT SCHEDULE........................ 3
FIELD METHODOLOGY................................ 3
Landward Portion of Profile.............................5
Gulfward Portion of Profile.............................. 5
Difficulties Encountered in the Surveys...................... 6
ANALYSIS AND PRESENTATION..........................6
CALCULATION OF VOLUME CHANGES AFTER NOURISHMENT 7 WAVE DATA......................................... 10
REFERENCES........................................ 11
APPENDIX I: COMBINED OFFSHORE AND BEACH PROFILES. I-1 APPENDIX II: THE FIRST (JULY 88) AND FIFTH (JULY 89) POST-NOURISHMENT PROFILES.........................I-i
APPENDIX III: SUMMARY OF WAVE DATA................. III-1




BEACH MONITORING PROJECT
SAND KEY PHASE II BEACH NOURISHMENT PROGRAM Post-Nourishment Report
PART II Offshore Profiles and Wave Data (Survey of July 19-25, 1989)
INTRODUCTION
This is the sixth in a series of reports presenting offshore survey results for the Sand Key Phase II beach nourishment project carried out in June, 1988. This project comprised the placement of 369,714 cubic yards of sand (paid yardage) obtained from Johns Pass ebb tidal shoals, delivered by pipeline dredge and placed along 1.6 miles of Sand Key shoreline. As shown in Figure 1, the monitoring project encompasses approximately 3 miles of shoreline extending from Florida Department of Natural Resources (FDNR) Monument No. R-96 to FDNR Monument No. R-111.
This field program to document the performance of this beach nourishment program is a joint effort between the University of South Florida (USF) and the University of Florida (UF). The USF has presented their results in a series of five reports.
This report is organized as follows. The main body of this report describes the survey methods, problems encountered and any necessary adjustments to the survey data. The following section presents an analysis of volume changes of sand for the entire survey region at North Redington Beach and Redington Shores. The volumes of sand remaining as determined by the July, 1989 survey are compared with the first post-nourishment (July, 1988) surveyed volumes, thus providing a measure of project performance over this twelve month period. The final section of the main body describes the wave data from the Clearwater gage which is maintained by the Univeristy of Florida. Appendix I presents the combined USF and UF profiles for the fifth post-nourishment (July 19-25, 1989) survey. Appendix II presents, for each profile line, the profiles obtained from the first (July 88) and fifth (July 89) post-nourishment surveys. Appendix III presents the wave data obtained in May, June, and July, 1989, from the UF maintained gage off Clearwater. The digitized data for this and the five earlier surveys in the form of floppy disks have been forwarded to Pinellas County and the Division of Beaches and Shores of the Florida Department of Natural Resources.




20 15 10
2"1 0 t
..... .... ....
-- --
de Ie

MONUMENT
-- PROFILE ..... CONTOUR(FT)

NAUTICAL MILE
0 1

Fig. 1: A plan view of beach monitoring profiles in the Sand Key project.




ADVANCED SUMMARY

The change in sand volume of the nourished beach was computed based on the first (July 88) and fifth (July 89) post-nourishment surveys. The change is a loss of 17,003 cubic yards between profiles R-96 and R-111G, which is a loss of about 3.2 percent of 529,150 cubic yards, the total amount of sand actually placed in the nourishment project. The change within the nourished area (R-99G to R-107) is 63,091 cubic yards, amounting to approximately 11.9 percent.
PURPOSE
The main objective of the project is to develop and interpret survey data. Based upon the surveyed profile data, changes in sediment volumes along the shoreline are computed. At the end of the two year project the littoral sediment budget in the North Redington Beach and Redington Shores area can be evaluated. Therefore, the long-term shoreline changes and sand losses for the project area can be estimated. Also, by using this information and the wave information collected from the Clearwater wave gage, -a wave refraction study of the monitored project area will be performed. The wave refraction study will allow comparison between predicted and measured performances of the beach nourishment project. It can be used also to interpret the sediment motion between any two surveyed profiles.
SURVEY AND REPORT SCHEDULE
The monitoring study is for a duration of two years plus pre- and postnourishment surveys. The offshore profiles were taken immediately prior to the nourishment project and immediately upon completion of the nourishment. Offshore profiles are to be taken at three month intervals for the first twelve months. During the second year after the initial nourishment, profiles will be taken at six month intervals. Individual reports have been completed for the pre-nourishment and first four post-nourishment surveys. A report will be prepared for each additional post-nourishment survey.
FIELD METHODOLOGY
The field survey program includes a total of 26 profiles. The corresponding profile azimuths were established by USF for the pre-nourished beaches representing an approximate shore normal direction at that time (also see Figure 1). The profiles are located at the U.S. Army Corps of Engineers profile points which are D.N.R. reference monuments listed in Table 1. These profile lines include R96, R-97, R-98G, T-98A, R-99G, R-99A, T-100, T-100A, R-101, R-101A, R-102,




TABLE 1: MONUMENTS INCLUDED IN SURVEY PROGRAM State Plane Coordinates (from D.N.R.)

Station*
R-96 R-97 R-98G T-98A
R-99G R-99A T-100 T-100A
R-101 R-101A R-102G R-102A R-103 R-103A T-104 T-104A R-105G R-105A T-106 T-106A
R-107 R-107A R-108G R-109 R-110G R-111G

Easting (x
(feet)
227958.485
228343.814 228772.087 229028.789 229275.691 229597.306 229891.061 230148.906
230423.542 230688.978 230898.594 231116.317 231360.509 231583.068 231879.478
232146.410 232455.921
232744.670 233058.630 233416.537 233776.623
234162.479 234521.211 235223.399 23603 1.320 236870.595

Northing Wy
(feet)
1276710.289 1275866.521 1275053.219 1274566.127 1274163.874 1273596.413 1273110.390 1272691.171 1272252.968 1271769.475 1271308.691 1270935.255 1270528.098 1269891.226 1269383.631 1268917.614 1268467.560 1268091.876 1267702.733 1267304.950 1266915.338
1266496.174 1266249.446 1265406.463 1264755.180
1264146.555

*'G' monuments established by USF Geology Dept.,
**Monument height (z) referenced to N.G.V.D. 1929

Mon. Ht.**z
(feet) 5.93
6.46 6.79
6.14 6.29 7.63 9.06 8.31 8.36 6.92
6.74 5.68 6.19 6.82
6.42 7.65 6.52
6.45 6.48 6.01
6.04 4.25 7.69
7.46 5.87 6.27

Azimuth
(0) 255 250
240 240 240 240 240 260
243 248 250
247 240 245 240 240 230 235
245 240 235
240 240 230
220 220

May, 1988




R-102A, R-103, R-103A, T-104, T-104A, R-105, R-105A, T-106, T-106A, R-107, R-107A, R-108, R-109, R-110, and R-111. For all these profiles, the D.N.R. monuments serve as the baseline points for the survey except for profiles R-102, R-105, and R-108 where the 'G' monuments established on the gulf front seawall by the University of South Florida are used as the baseline points.
The field surveys are divided into a landward portion (conducted by USF) and a gulfward portion (conducted by UF).
Landward Portion of Profile
The technique of documenting the landward portion of the profiles has been described in earlier USF reports, but will be presented briefly here.
The survey procedures for the landward portion of the profile are standard for land surveying. Basically a leveling rod is held vertical at points of interest by a 'rod-person' and in this case the elevation is read using a transit. The distance from the transit to the rod is established optically by reading stadia hairs on the telescope of the transit. This procedure is continued out to wading depth where the boat surveys continue the profile line into the gulf. In order to obtain the maximum possible overlap between the landward and gulfward portions of the lines, it is desirable to conduct the landward surveys at low tide and the gulfward surveys during high tide.
Gulfward Portion of Profile
The offshore profile survey is performed using a computer controlled survey system installed on a 26 feet aluminum power boat. The survey system includes a fathometer unit (Model 412 Auto Track) and a range finder (Mini-Ranger Falcon 484). The fathometer is able to measure water depths ranging from 2.0 to 999.9 feet and provides an accuracy within 0.1 foot. The range finder can measure distance between the receiver transmitter located on the boat and a microwave transponder located on shore up to distances of 10 nautical miles with a probable error range of 6 feet. When sampling a profile, the boat moves relatively slowly along the profile in order to obtain dense data points. In the shallower water depths, a boat speed of 4 knots is maintained and in deeper water where the bottom slopes are less, a speed of 6 knots is maintained. The measured profile data obtained from the fathometer and the range finder are recorded in a Toshiba Micro-computer at a sampling rate of one data point per second. Therefore, the horizontal distance between any two contiguous sample points is about 7 feet in the nearshore area, and 10 feet in the offshore area.




The Mini-Ranger which is used for horizontal positioning consists of a 'master' unit mounted on the boat and a 'slave' unit located on the shore reference point from which the profile is being measured. Upon command from the master unit (at one second intervals), the slave unit responds and the delay between command and receipt of response is interpreted as distance. Since only one transponder is utilized, thus providing distance from the reference point, the alignment along the profile is provided by positioning two large orange-color target boards on the beach. They are separated by some distance and aligned with the profile azimuth by using a transit. The boat then moves in a course adjusted visually on line with the two target boards. Two survey runs are usually carried out for each profile line. An extra run may be added to profile surveys if any irregularities of the survey system are encountered during the profiling. For the post-nourishment survey conducted in July, 1989, the profile surveys were extended gulfward to a water depth of 18 feet.
Difficulties Encountered in the Surveys
No difficulties were experienced during the July, 1989 survey.
ANALYSIS AND PRESENTATION OF DATA
The offshore profile data obtained in the field are analyzed in the Coastal Laboratory of the Department of Coastal and Oceanographic Engineering at the University of Florida. After the data are retrieved from the field, they are transferred from the Toshiba Micro-computer to a standard VAX-750 computer for later analysis. The first step in the analysis of surveyed profile data is to eliminate any erratic points in the depth measurements with frequencies smaller than 0.1 Hz by utilizing a nine-point rectangular filter. The second step is to adjust the water depth data, based upon the measurements of daily tides from a tide gage, to N.G.V.D datum. The third step is to reformat the data based on a linear interpolation to generate profile data points at spacings of 10 feet in horizontal distance from the baseline. The fourth step is to blend the two or three runs of a profile into one single profile. The reduced data indicate the final form for the surveyed profiles and are available in 5.25" floppy diskettes at the Department of Coastal and Oceanographic Engineering, University of Florida.
Appendix I presents plots combining the offshore profiles and beach profiles, surveyed by the Department of Geology, University of South Florida, for the postnourishment survey. Appendix II presents the offshore and beach profiles for both the first (July 88) and fifth (July 89) post-nourishment surveys. Some of the composite profiles are seen to have a segment which is dashed in the nearshore




area. The dashed line indicates the 'constructed' profile which is not available from either the beach/nearshore profile survey or the offshore profile survey. It is constructed in a sense that if no bar formation is present in the adjacent profiles a simple interpolation is then inserted for the gap. Otherwise, a smoothed bar segment similar to the neighbouring profiles is established in the gap. A comparison of profiles T-104 between July 88 and July 89 surveys reveals large differences of the two for offshore distances greater than 1,800 feet. It is noted here that the offshore portion of T-104 was not measured in July, 1988, and it was linearly interpolated between the two adjacent profiles: R-103A and T-104A. Thus, the interpolated T-104 profile of July 88 is less accurate than the measured one of July 89.
CALCULATION OF VOLUME CHANGES AFTER NOURISHMENT
The volume changes of sand for the nourished beach are computed by adding the volume changes of sand in every two adjacent profiles between the July 88 and July 89 surveys. In computing the volume change between any two adjacent profiles, the volume change per beach length at each profile is first calculated. This is equivalent to computing the area change of sand in a profile between the July 88 and July 89 surveys. The individual profile area is obtained by using a trapezoidal rule to numerically integrate the area from the monument to a reference offshore distance, which is normally chosen at the place where the water depth is equal to 12 feet. The volume change in any two adjacent profile lines is computed, based on the spacings between the two profiles, and using the trapezoidal rule. A positive change of volume corresponds to an increase of volume and indicates a convergence zone of sand, while a negative change of volume corresponds to the decrease of sand and a divergence zone. Table 2 presents the results for the computation of volume changes from profiles R-96 to R-111G between the July 88 and July 89 surveys. The integration of sand area in a profile is referred to N.G.V.D, 1929, and is carried out from the monument location to a 12 feet depth offshore distance.
Figure 2 shows the computed volume changes and cumulative changes in the survey region between July 88 and July 89 surveyed data. It is seen in Figure 2 that the greatest volume losses occur in two areas: one is between R-99G and T-100A, and another is between T-104A and R-107. As with the July 88 to July 89 volume changes, these losses appear to be due to a combination of three effects:
(1) the expected "spreading" losses associated with the nourishment project, (2) trapping of the northerly transport by the Redington Shores breakwater, and (3) the background erosion. Also shown in Figure 2 are the volume changes for the July 88, Nov 88, Jan 89, and April 89 surveys. It is seen that more erosion occurred




TABLE 2: CALCULATION OF VOLUME CHANGES AFTER NOURISHMENT.

Station* Spacing
(feet)

R-96 R-97 R-98G R-98A R-99G R-99A T-100 T-100A R-101 R-101A R-102G R-102A R-103 R-103A T-104 T-104A R-105G R-105A T-106 T-106A R-107 R-107A R-108G R-109 R-11OG R-111G

928
919 550
472 652 568
492 517 552 506
432 475 675 588
537 546 474 500 535 530 570
435 1097 1038 1037

length** (feet)

2800 1300 1400 1450 1400 1450 2300 2000 3200 3500 3300 3550 3250 2950 2200 2200 1200 1700 1800 2050 2050 1900 1750 1900 1000 2100

vol.*** per unit beach length(ft2) July 88 July 89

-35200
-12234
-14131
-12377
-12692
-12562
-24302
-17920
-36449
-41075
-37414
-40252
-34098
-32622
-20343
-20251
-8906
-14376
-15003
-17598
-18521
-18050
-14419
-17365
-6222
-20871

-35144
-12191
-13718
-11994
-12673
-13130
-24756
-18591
-35899
-40734
-37209
-39805
-33952
-32305
-20978
-20954
-9364
-15050
-15370
-18173
-18688
-17338
-14435
-17114
-6199
-20707

vol. change per unit length(ft2)

56
43 413 383 19
-568
-454
-671 550
341 205
447 146 317
-635
-703
-458
-674
-367
-575
-167 712
-16 251
23 164

vol. change (cubic yard)

1706 7770 8117 3513
-6635
-10748
-10253
-1165 9092 5119 5221 5211 5774
-3463
-13305
-11748
-9933
-9634
-9331
-7293 5746 5604 4757 5277 3598

Volume Volume

changes from R-99G to R-107 in cubic yards = -63,091 changes from R-96 to R-111G in cubic yards = -17,003

* nourished area from R-99G to R-107
** horizontal distance over which volume is integrated (from baseline
to an approximate depth of 12 ft)
***volume relative to N.G.V.D. 1929




VOLUME CHANGE PER PROFILE
(102 TRRD3/FT)
0 1 0 0(1

CUMULATIVE RLONGSHORE CHANGE
1 (10 TARO3 )
0 0 0




in the area between T-104 and R-107, and some deposit of sands at R-99A after the April 89 survey. Sand is seen to move back into the survey region from the most northerly profile R-96 than the southerly profile R-111G. The changes from April 89 to July 89 were relatively small.
The total calculated volume loss of sand in the nourished segment (from R-99G to R-107) between the July 88 and July 89 surveys is 63,091 cubic yards, which is a loss about 11.9 percent of 529,150 cubic yards of material actually placed in the nourishment project. However, most of the lost volume of sand is found to remain in the neighbourhood inside the entire survey region. The total loss of sand computed between R-96 and R-11IG is 17,003 cubic yards, which is only 3.2 percent of the sand placed in the nourishment project. It is stressed that a part of these net volume reductions is due to the background erosion and not due to spreading losses induced by the nourishment project.
WAVE DATA
Before May 31, 1989, wave data were collected by a UF maintained underwater pressure gage located about 3 miles offshore Clearwater Beach, Florida. The data contain unidirectional wave information, including modal wave period and significant wave height. Since wave directions were not mearsured, they are assumed to be the same as the local wind directions. After June 1, 1989, directional wave data were collected at the offshore Clearwater station by a pressure gage and a biaxial currentmeter package. The data contain directional wave information, including modal wave period, significant wave height, dominant wave direction and the directional distribution of wave energy. A parameter is computed and presented here as a measure of the directional spreading of the wave system. Its value is equal to the power of a squared cosine function which fits best the actual directional wave energy distribution (Sand, 1979). The higher the value of a spreading parameter, the greater the directional concentration of wave energy, with the largest wave energy density occurred at the mean wave direction. Appendix III presents the wave data collected in May, June, and July, 1989. Also included in Appendix III are the daily tidal data, and the mean current data. The wave refraction analysis is in process and will be published as an addendum to this report.




REFERENCES

1. Lin, L.H., and R. Dean, 1989a. "Sand Key Phase II Beach Nourishment Program: Pre-Nourishment Report, Part II Offshore Profiles (Survey of May 12-18, 1988)," Technical Report, Coastal Engrg. Dept., Univ. of Florida,
Gainesville, Florida. UFL/COEL-89/003.
2. Lin, L.H., and R. Dean, 1989b. "Sand Key Phase II Beach Nourishment
Program: Post-Nourishment Report, Part II Offshore Profiles and Wave Data (Survey of July 21-22, 1988)," Technical Report, Coastal Engrg. Dept.,
Univ. of Florida, Gainesville, Florida. UFL/COEL-89/004.
3. Lin, L.H., and R. Dean, 1989c. "Sand Key Phase II Beach Nourishment
Program: Post-Nourishment Report, Part II Offshore Profiles and Wave Data (Survey of November 18-23, 1988)," Technical Report, Coastal Engrg.
Dept., Univ. of Florida, Gainesville, Florida. UFL/COEL-89/006.
4. Lin, L.H., and R. Dean, 1989d. "Sand Key Phase II Beach Nourishment
Program: Post-Nourishment Report, Part II Offshore Profiles and Wave Data (Survey of January 25-26, 1989)," Technical Report, Coastal Engrg.
Dept., Univ. of Florida, Gainesville, Florida. UFL/COEL-89/007.
5. Lin, L.H., and R. Dean, 1989e. "Sand Key Phase II Beach Nourishment Program: Post-Nourishment Report, Part II Offshore Profiles and Wave Data (Survey of April 25-26, 1989)," Technical Report, Coastal Engrg. Dept.,
Univ. of Florida, Gainesville, Florida. UFL/COEL-89/010.
6. Sand, S.E., 1981. "Three-dimensional Deterministic Structure of Ocean
Waves," Inst. Hydrodyn. and Hydr. Engrg., Tech. Univ. Denmark, Series
paper No. 4.




APPENDIX L
COMBINED OFFSHORE AND BEACH PROFILES




APPENDIX I:
COMBINED OFFSHORE AND BEACH PROFILES
OFFSHORE AND BEACH PROFILE NOTES: a. All elevations are in feet and tenths and are referred to
N.G.V.D. 1929.
b. Coordinates are based on the standard plane rectangular
coordinate system for the state of Florida.
c. Azimuths (0 = north) are clockwise relative to magnetic north. d. Profile azimuths were established for the pre-nourished
beaches representing a shore normal strike at that time.
e. D.N.R. monuments are standard bronze disks set in concrete. f. USF Coastal Research Lab 'G' monuments represent surveyed
gulfward markers of the Corps of Engineers monuments.
g. Plotted offshore profiles begin at the DNR/USF-'G' monuments
located on the seawall and extend gulfward.




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COASTAL & OCEAN ENG DEPT UNIVERSITY OF FLORIDA

RANGE:R-99G 3/4
SURVEY BEAR(MAG.N):24O BEACH SURVEY:24JUL89 OFFSHORE SURVEY:19JUL89

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