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UFL/COEL-89/003 BEACH MONITORING PROJECT SAND KEY PHASE II BEACH NOURISHMENT PROGRAM (North Redington Beach and Redington Shores) Pre-Nourishment Report PART II - Offshore Profiles (Survey of May 12-18, 1988) by Li-Hwa Lin and Robert G. Dean Prepared for: Pinellas County and Division of Beaches and Shores Florida Department of Natural Resources February,1989

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Page 1: PART II - Offshore Profilesufdcimages.uflib.ufl.edu/UF/00/07/61/25/00001/UF00076125.pdfBEACH MONITORING PROJECT SAND KEY PHASE II BEACH NOURISHMENT PROGRAM Pre-Nourishment Report PART

UFL/COEL-89/003

BEACH MONITORING PROJECTSAND KEY PHASE II BEACH NOURISHMENTPROGRAM(North Redington Beach and Redington Shores)Pre-Nourishment ReportPART II - Offshore Profiles(Survey of May 12-18, 1988)

by

Li-Hwa LinandRobert G. Dean

Prepared for:

Pinellas CountyandDivision of Beaches and ShoresFlorida Department of Natural Resources

February,1989

Page 2: PART II - Offshore Profilesufdcimages.uflib.ufl.edu/UF/00/07/61/25/00001/UF00076125.pdfBEACH MONITORING PROJECT SAND KEY PHASE II BEACH NOURISHMENT PROGRAM Pre-Nourishment Report PART

REPORT DOCUMENTATION PAGE1. Report no. 2. 3. Recipient's Accession No.

4. Title and Subtitle 5. Report DateBEACH MONITORING PROJECTSAND KEY PHASE II BEACH NOURISHMENT PROGRAM February 1989PART II - Offshore Profiles 6.(Survey of May 12-18, 1988)

7. Author(s) 8. PerforminS Organization Report No.Li-Hwa Lin UFL/COEL-89/003Robert G. Dean

9. Performing Organization aie and Address 10. Project/Task/Work Unit No.

Coastal and Oceanographic Engineering DepartmentUniversity of Florida 11. contract or crant No.336 Weil Hall

Gainesville, FL 32611 13. Type of Report

12. Sponsoring Orgnization Name and Address Final

Pinellas CountyandDivision of Beaches and ShoresFlorida Department of Natural Resources 14.

15. Supplementry Notes

16. Abstract

This study presents the pre-nourishment survey 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-1ll. The surveys are divided into a landward portion (conducted by

USF) and a gulfward portion (conducted by UF). The landward portion of profile

is surveyed by using the 'level' and 'rod'. The gulfward portion of profile is

surveyed by boat. For the pre-nourishment survey, overlap of the landward and

gulfward portions of some of the profiles was not obtained. Inspection of this

problem showed that greater emphasis needed to be given to carrying out the

landward portion of the surveys at low tide and the gulfward portion of the

surveys at high tide.

17. Originator's Key Words 18. Availability StatementMonitoringNourishment

Profiles

Survey

19. U. S. Security Classif. of the Report 20. U. S. Security Clasaif. of This Page 21. No. of Pages 22. Price

Unclassified Unclassified 111

Page 3: PART II - Offshore Profilesufdcimages.uflib.ufl.edu/UF/00/07/61/25/00001/UF00076125.pdfBEACH MONITORING PROJECT SAND KEY PHASE II BEACH NOURISHMENT PROGRAM Pre-Nourishment Report PART

BEACH MONITORING PROJECTSAND KEY PHASE II BEACH NOURISHMENT PROGRAM

(North Redington Beach and Redington Shores)Pre-Nourishment Report

PART II- Offshore Profiles(Survey of May 12-18, 1988)

Submitted to:

Pinellas County

and

Division of Beaches and ShoresFlorida Department of Natural Resources

by

Li-Hwa Lin

and

Robert G. Dean

Department of Coastal and Oceanographic EngineeringUniversity of FloridaGainesville, FL 32611

February, 1989

Page 4: PART II - Offshore Profilesufdcimages.uflib.ufl.edu/UF/00/07/61/25/00001/UF00076125.pdfBEACH MONITORING PROJECT SAND KEY PHASE II BEACH NOURISHMENT PROGRAM Pre-Nourishment Report PART

BEACH MONITORING PROJECTSAND KEY PHASE II BEACH NOURISHMENT PROGRAM

(North Redington Beach and Redington Shores)Pre-Nourishment Report

PART II- Offshore Profiles(Survey of May 12-18, 1988)

Submitted to:

Pinellas County

and

Division of Beaches and ShoresFlorida Department of Natural Resources

by

Department of Coastal and Oceanographic EngineeringUniversity of Florida

and

Department of GeologyUniversity of South Florida

PART I - Beach profiles (USF - Separate Cover)PART II - Offshore profiles (UF)PART III - Sediment analysis (USF - Separate Cover)PART IV - Shoreline maps (USF - Separate Cover)

February, 1989

Page 5: PART II - Offshore Profilesufdcimages.uflib.ufl.edu/UF/00/07/61/25/00001/UF00076125.pdfBEACH MONITORING PROJECT SAND KEY PHASE II BEACH NOURISHMENT PROGRAM Pre-Nourishment Report PART

TABLE OF CONTENTS

page

INTRODUCTION ................................ 1

PURPOSE..................................... . 1

SURVEY AND REPORT SCHEDULE .................... 3

FIELD METHODOLOGY ........................... 3

Landward Portion of Profile ......................... 3

Gulfward Portion of Profile .......................... 5

ANALYSIS AND PRESENTATION ..... ................. 6

APPENDIX I: COMBINED OFFSHORE AND BEACH PROFILES. I-1

i

Page 6: PART II - Offshore Profilesufdcimages.uflib.ufl.edu/UF/00/07/61/25/00001/UF00076125.pdfBEACH MONITORING PROJECT SAND KEY PHASE II BEACH NOURISHMENT PROGRAM Pre-Nourishment Report PART

BEACH MONITORING PROJECT

SAND KEY PHASE II BEACH NOURISHMENT PROGRAM

Pre-Nourishment Report

PART II - Offshore Profiles (Survey of May 12-18, 1988)

INTRODUCTION

This is the first of 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) ob-

tained 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 Mon-

ument 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 three

reports. The UF reports had been delayed until now to rectify some inconsistences

in base line control.

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 date. Appendix I presents the combined USF and UF profiles for

the pre-nourishment (May, 1988) surveys. The later reports covering the post-

nourishment phase will include wave data for the period encompassed by that

report from the UF maintained gage off Clearwater. The digitized data in the

form of a floppy disk have been forwarded to the Pinellas County and the Divi-

sion of Beaches and Shores of the Florida Department of Natural Resources.

PURPOSE

The main objective of the project is to develop and interpret survey data.Based upon the surveyed profile data, changes in sediment volume along the shore-line can be computed. At the end of the two year project the littoral sedimentbudget in the North Redington Beach and Shores can be evaluated. Therefore,

1

Page 7: PART II - Offshore Profilesufdcimages.uflib.ufl.edu/UF/00/07/61/25/00001/UF00076125.pdfBEACH MONITORING PROJECT SAND KEY PHASE II BEACH NOURISHMENT PROGRAM Pre-Nourishment Report PART

SR68820 15 10

; ,r. / / 699

- - 6

4>' --- 4- .

---------

SR694i

* \

PROFILE NUTICL MILE

- CONTOUR (FT)

-- PRIFI L NFIUICFI M--

I *

..... CONTOUR (FTO

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

2

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the long-term shoreline changes and sand losses for the project area can be esti-

mated. 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 pre-

dicted 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 post-

nourishment surveys. The offshore profiles were taken immediately prior to the

nourishment project and immediately upon completion of the nourishment. Off-

shore 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 will be prepared for the pre-nourishment

survey and for each of the post-nourishment surveys.

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 represent-

ing 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 R-96,

R-97, R-98A, R-99A, T100, T100A, R101, R101A, R102, R103, R103A, T104,

T104, R105, R105A, T106, T106A, R107, R107A, R108, R109, R110, and R111.

For all these profiles, the D.N.R. monuments will 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 will be

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 beendescribed in earlier USF reports, but will be presented briefly here.

The survey procedures for the landward portion of the profile are standard forland surveying. Basically a leveling rod is held vertical at points of interest by a

3

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TABLE 1: REDINGTON BEACH MONUMENTS.

State Plane Coordinates (from D.N.R.)

Station Easting (x) Northing (y) Mon. Ht. (z) Azimuth

(feet) (feet) (feet) (o)R-96 227958.485 1276710.289 5.93 255

R-97 228343.814 1275866.521 6.46 1250

R-98G 228772.087 1275053.219 6.79 240

T-98A 229028.789 1274566.127 6.14 240

R-99G 229275.691 1274163.874 6.29 240

R-99A 229597.306 1273596.413 7.63 240

T-100 229891.061 1273110.390 9.06 240

T-100A 230148.906 1272691.171 8.31 260

R-101 230423.542 1272252.968 8.36 243

R-101A 230688.978 1271769.475 6.92 248

R-102 231008.001 1271352.894 5.48

R-102G 230898.594 1271308.691 6.74 250

R-102A 231116.317 1270935.255 5.68 247

R-103 231360.509 1270528.098 6.19 240

R-103A 231583.068 1269891.226 6.82 245

T-104 231879.478 1269383.631 6.42 240

T-104A 232146.410 1268917.614 7.65 240

R-105 232484.160 1268492.980 6.24

R-105G 232455.921 1268467.560 6.52 230

R-105A 232744.670 1268091.876 6.45 235

T-106 233058.630 1267702.733 6.48 245

T-106A 233416.537 1267304.950 6.01 240

R-107 233776.623 1266915.338 6.04 235

R-107A 234162.479 1266496.174 4.25 240

R-108 234582.270 1266287.600 6.58

R-108G 234521.211 1266249.446 7.69 240

R-109 235223.399 1265406.463 7.46 230

R-110G 236031.320 1264755.180 5.87 220

R-111G 236870.595 1264146.555 6.27 220

* Monument height (z) referenced to N.G.V.D. 1929** 'G' monuments established by USF Geology Dept., May, 1988

(located on seawall)

4

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'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 measures

distance between the receiver transmitter located on the boat and a microwave

transponder located at a reference point up to 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 PDP-

11/23 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 poor performance ofthe survey system is encountered during the profiling processes. The survey of aprofile is stopped in the offshore area either at a water depth of 18 feet or at adistance greater than about 1 nautical mile.

5

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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 trans-

ferred from the PDP-11 Micro-computer to a standard VAX-750 computer for

later analysis. The first step in the analysis of surveyed profile data is to elimi-

nate 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 profiles 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.

The data obtained from the first survey did not include the desired overlap. In

fact, as noted above, there were data gaps between the land and offshore surveyed

portions for a number of the profiles. These deficiencies were due to a combination

of the land surveys not extending a sufficient distance gulfward and the offshore

survey not extending an adequate distance landward. The survey techniques have

been modified in subsequent surveys to improve the amount of overlap.

Appendix I presents plots combining the offshore profiles and beach profiles,

surveyed by the Department of Geology, University of South Florida, for the pre-

nourishment survey. 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 beach/nearshore profile survey or offshore

profile survey. It is constructed in a sense that if no bar formation appears 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.

The offshore profile for T-104 was not measured for the pre-nourishment survey

and it was established as a linear interpolation between the two neighbouring

profiles: R-103A and T-104A.

6

Page 12: PART II - Offshore Profilesufdcimages.uflib.ufl.edu/UF/00/07/61/25/00001/UF00076125.pdfBEACH MONITORING PROJECT SAND KEY PHASE II BEACH NOURISHMENT PROGRAM Pre-Nourishment Report PART

APPENDIX I:

COMBINED OFFSHORE AND BEACH PROFILES

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APPENDIX I:COMBINED OFFSHORE AND BEACH PROFILES

OFFSHORE PROFILE NOTES:

a. All elevations are in feet and tenths and are referred toN.G.V.D. 1929.

b. Coordinates are based on the standard plane rectangularcoordinate system for the state of Florida.

c. All azimuths (0 = north) are in accordance to magnetic north.

d. Profile azimuths were established for the pre-nourishedbeaches 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 surveyedgulfward markers of the Corps of Engineers monuments.

g. Plotted offshore profiles begin at the Corps of Engineer/USF-'G' monuments located on the seawall and extend southward.

I-1

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- MEASURED PROFILE COASTAL OCEAN ENG DEPT SURVEY BER(MAG.N):25588-- CONSTRUCTED PROFILE UNIVERSITY OF FLORIDA OFFSHORE SURVEY:18MAY88

r-.FSOR SURVEY:I8MRY88L--

Page 15: PART II - Offshore Profilesufdcimages.uflib.ufl.edu/UF/00/07/61/25/00001/UF00076125.pdfBEACH MONITORING PROJECT SAND KEY PHASE II BEACH NOURISHMENT PROGRAM Pre-Nourishment Report PART

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FEET

COMBINE PROFILE COUNTI:I IP I N E LL RRNGE:R-96 2/4 I I II II

B-E A CHRT E P FU V I OR V ER T

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Page 16: PART II - Offshore Profilesufdcimages.uflib.ufl.edu/UF/00/07/61/25/00001/UF00076125.pdfBEACH MONITORING PROJECT SAND KEY PHASE II BEACH NOURISHMENT PROGRAM Pre-Nourishment Report PART

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