ND-RI69 646 AUTEC OCEAN NAULDOUN DIVE SURVEY SITE I OND SITE,2(U) Is'ITRACOR/NARINE INC FORT LRUDERDALE FL 31 AUG 63

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*OFFICE SYM 7a. NAME OF MONITOR]Ocean Engineering& Construction

I Project officeCI-ESNAVFACENGCOM

Zip Code) 7b. ADDRESS (City, EBLDG. 212, Washin~tcAWashington, D.C. 2

OFFICE SYM 9. PROCUREMENT INSTEN00600-81--D-5270

Ocean Engineering :CHESAPEAKE DIVISIONNAVAL FACILITIES ENGINEERING 0X)41A~NDWASHINGION NAVY YARDWZASHING'ION, DC 20374

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DL%"TM0T~lN STATEMNAA:p1rv1d 1o: public leeap~

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UnclassifiedSECURITY CLASSIFICATION OF THIS PAGE A -_ _ _

REPORT DOC AD-A '169 040~Gla. REPORT SECURITY CLASSIFICATION 4 GSUnclassified

2a. SECURITY CLASSIFICATION AUTHORITY 3. DISTRIBUTION AVAILABILITY OF REP.Approved for public release:

* distribution is unlimited

2b. DECLASSIFICATION/DOWNGRADING SCHEDULE dt"

4. PERFORMING ORGANIZATION REPORT NUMBER 5. MONITORING ORGANIZATION REPORT #FPO 8361

6a. NAME OF PERFORM. ORG. 6b. OFFICE SYM 7a. NAME OF MONITORING ORGANIZATIONTracor Marine. Inc. Ocean Engineering

& ConstructionProject OfficeCHESNAVFACENGCOM

6c. ADDRESS (City. State, and Zip Code) 7b. ADDRESS (City. State, and Zip )BLDG. 212. Washington Navy YardWashington, D.C. 20374-2121

8a. NAME OF FUNDING ORG. 8b. OFFICE SYM 9. PROCUREMENT INSTRUMENT INDENT #N00600-81-D-5270

8c. ADDRESS (City, State & Zip) 10. SOURCE OF FUNDING NUMBERSPROGRAM PROJECT TASK WORK UNITELEMENT # # # ACCESS #

11. TITLE (Including Security Classification)

AUTEC Ocean Hauldown Dive Survey Sit, 1 & Site 2

12. PERSONAL AUTHOR(S)

13a. TYPE OF REPORT 13b. TIME COVERED 14. DATE OF REP. (YYMMDD) 15. PAGES '

FROM TO 83-08-31 4116. SUPPLEMENTARY NOTATION

17. COSATI CODES 18. SUBJECT TERMS (Continue on reverse if nec.)

. FIELD GROUP SUB-GROUP Atlantic Undersea Test & Evaluation Center.-. _ _ _Surveying. Oceanography Diving

19. ABSTRACT (Continue on reverse if necessary & identify by block number)Tracor Marine was tasked by Chesapeake Division Naval Engineering Command toperform a dive survey in areas off AUTEC Sites 1 and 2 at Andros Island.Bahamas. The survey was requested by Naval Underwater Systems Command (NUSC).Newport to evaluate the existing bottom conditions at specific Site 1 CC n't)20. DISTRIBUTION/AVAILABILITY OF ABSTRACT 21. ABSTRACT SECURITY CLASSIFICATION

SAME AS RPT.22a. NAME OF RESPONSIBLE INDIVIDUAL 22b. TELEPHONE 22c. OFFICE SYMBOLJacqueline B. Riley 202-433-3881DD FORM 1473, 84MAR SECURITY CLASSIFICATION OF THIS PAGE

* ~ **.*.

- -. .V- ,--W,......

BLOCK 19 (Con't)

and Site 2 locations previously marked by reference buoys. The topographicinformation was required in order to determine a location for the proposedocean hauldown facility. Ideally, such a location would be in depths ofapproximately 40 feet with flat terrain and free of large obstructions.

Information required by NUSC at Site 1 and Site 2 during the dive surveyincluded bottom types, depths, possible platform locations, locations ofobstruction, and possible cable routes through the reef line to shore.

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Tracer Marine

Final ReportAUTEC Ocean Hauldown Dive Survey

Site 1 & Site 2

Submitted to:

NAVAL FACILITIES ENGINEERING

C OMMAND

ByTRACOR MARINE, INC.

31 August 1983

DTICSJUN1319

'

DOMT0fSTATEMENT ArApproved fot public releos.:

Dis'ttibi ior Unlimited

t. .*.

Tracor Marine

Final Report

AUTEC Ocean Hauldown Dive Survey

Site 1 & Site 2

Submitted to:

NAVAL FACILITIES ENGINEERING COMMAND

Building 200

Washington Navy Yard

Washington, D.C. 20374

Contract Number

N00600-81-D-5270

TRACOR MARINE, INC.

Job Number 723511

31 August 1983

-7 - -,J

Approved / <,,"Edward ClausnerVice President

* -'.

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Tracor Marine

DU

DIVE SURVEY FOR OCEAN HAULDOWN

Site 1 & Site 2

TABLE OF CONTENTS

1.0 OVERVIEW

2.0 SURVEY DATA SITE 1

2.1 Scope

2.2 Results

3.0 SURVEY DATA SITE 2

3.1 Scope

3.2 Results

4.0 CONCLUSION

9.25.0 PERSONNEL

6.0 GENERAL LOG

7.0 DIVE EQUIPMENT AND MATERIAL

8.0 PHOTOGRAPHS .A

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Tracor Marine,,.... . l

"

1.0 OVERVIEW

Tracor Marine was tasked by Chesapeake Division Naval Engineer-

ing Command to perform a dive survey in areas off AUTEC Sites

1 and 2 at Andros Island, Bahamas. The survey was requested by

Naval Underwater Systems Command (NUSC), Newport to evaluate

the existing bottom conditions at specific Site 1 and Site 2

locations previously marked by reference buoys. The topographic

information was required in order to determine a location for

the proposed ocean hauldown facility. Ideally, such a location

would be in depths of approximately 40 feet with flat terrain

and free of large obstructions.

Information required by NUSC at Site 1 and Site 2 during the

dive survey included bottom types, depths, possible platform

locations, locations of obstruction, and possible cable routes

through the reef line to shore. Accesion For

NTIS CRA&iDTIC TAB [

Unamiou:,ccd EjJustification

0By ... .....DiAt ib-itio I/-ovaihdbiaity Codes

Avaii and/or

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Tracor Marine

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2.0 SURVEY DATE SITE 1

2.1 Scope

The site 1 dive survey was conducted at an area outside the

shallow reef approximately 0.5 miles north of the Site 1

seabuoy. The area was marked with a surfact reference buoy

0 0at Latitude 24 43' 43.2403" N, Longitude 770 45' 39.9693 W.

The location of the reference buoy in 40 feet of water was

determined from Trisponder information obtained during an

earlier bathymetic survey at Site 1 on 7 August, 1983.

The survey was conducted on August 21 and 22 from Zodiac inflat-

able boats with motors. Three scuba divers were used to perform

this survey. Small marker buoys were placed to indicate areas

of interest.

A theodolite positioning team from RCA-West Palm Beach was used

at the completion of the survey to determine positions of the

small marker buoys for future reference. This team used

existing control points at Site 1.

The expected position of the reference buoy was confirmed by

the theodolite positioning team on August 22 and its position

2-1

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Tracor Marine

is shown in Figure 2-1. (Reference buoy anchor chain was

wrapped around coral head). The survey in the vicinity of

the buoy indicated several areas of interest and small marker

buoys numbered 3, 7, 2, 1, and 5 were placea to delineate

these areas.

Figure 2-2 is a bottom-type chart generated from information

gathered during the survey. The bottom directly east or sea-

ward of the reference buoy is characterized by a spur and

groove coral formationi running east and west for approximately

50 feet. The sand trenches (grooves) have a general depth of

40 feet and the coral spurs have a relief of 4 to 6 feet. The

coral spurs diminish seaward to a sand area 75 feet wide which

parallels the coral line and sweeps back toward the shoreline.

There is no coral in this sand area. The sand is approxi-

mately 14" thick over a coral hard ground and the depth is

approximately 50 feet. Buoy #7 is located on the east side

of this sand area and buoy # is located on the western side.Sm

A coral bottom is again present for approximately 20 feet

from buoy #7 seaward, with the normal 4 to 6 foot relief. The

depth of water in this area is 55 feet.

2-2

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Buoys #1 and 2 mark an area of sand of approximately 40 feet

in length and at a water depth of 65 feet.

Further seaward, the sand fades into a coral bottom with a '1slight rise at the 65 foot depth and then falls off to approxi-

mately 80 feet with a fairly gentle slope.

Continuing seaward, the slope becomes more pronounced and the

bottom drops to 110 feet. Here the slope becomes fairly

steep 450 and drops to 145 feet. At this point, the bottom

slope is much more pronounced and drops on off to the floor at

TOTO (Approximately 80 slope).

Buoy # 5 marks an outcroping which was teaming with fish and

may be an outflow of water from an underground source.

Buoys #10 and 11 were placed in a shallow reef cut to define

a possible cable route to shore which is shown as a dashed

line on Figure 2-1. They are located in approximately 10 feet

of water with coral and sand bottom. The relief is approxi-

mately 2-3 feet and clear of obstructions to shore.

Figure 2-3 gives lat/long of all buoys placed at site one plus

buoy depth and bottom description.

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3.0 SURVEY DATE SITE 2

3.1 Scope

The Site 2 survey was conducted in an area approximately mile

south of the Site 2 sea buoy. The general area was marked

with a surface reference buoy at Latitude 240 29' 24.2049 N,

oLongitude 77 41' 53.0062 W as shown in Figure 3-1. The loca-

tion of the reference buoy was determined from Trisponder in- '. ".

formation obtained during a bathymetric survey of the Site 2

area on 8 August, 1983.

The survey was conducted from 23 to 25 August, 1983, using

Zodiac inflatable boats with motors. Four scuba divers were

used to perform this survey with a Nikonos underwater camera

for photo documentation. During the survey, buoys were dropped

to mark obstructions and identify the area. Buoys were also

anchored to mark the locations of the proposed cable route

from the hauldown area throu4h a small cut in the barrier reef

to the beach at Site 2. (See Figure 3-2).

At the completion of the survey, a theodolite positioning team

from RCA-West Palm Beach, positioned all marker buoys to

'-

3-1 7

Tracor Marine

determine their latitude and longitude. Three theodolites

were used on a 3 mile base line, Figure 3-1.

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3.2 Results

The first dive made at Site 2 was made at the reference buoy.

This inspection dive was to survey the general area and to

pinpoint what regions might be suitable for the ocean haul-

down platform or barge. The 9 August 1983 deep water bathy-

metric survey had determined a depth of 38 feet at the

reference buoy. Diver measurements at the location concluded

that the actual depth was 53 feet and determined that the

38 feet reading resulted from the extreme coral relief at

this location. The coral heads were tightly spaced, pinnacle

shaped buttresses rising as much as 20 feet off the bottom.

Diver observations indicate that this bottom type characterized

a large area (100 yard radius of the reference buoy) between

depths of 40 to 60 feet. The unusual coral growth covered 4.

90 percent of the bottom with the heads separated by narrow

meandering sand channels. For at least 150 yards south of the

reference buoy, similar rocky heads were observed. However,

3-2

Tracor Marine

50 yards to the north and north east, sand terraces were found.

These sand terraces occurred between water depths of 65 and

90 ft. and were most common at 70 ft. Boundaries of the

largest and most suitable sand terrace was marked with buoys

as shown in Figure 3-2.

The general profile (Figure 3-3) of the surveyed area from

west to east consists of a hard coral rock plateau with small

heads from the barrier reef to 100 yards west of the reference

buoy. The depth of the plateau before the drop off to the

deep reef is 25 feet. The deep reef begins after the drop at

45 to 50 feet and continues gradually to 70 feet where the

sand terraces begin. The terraces extend from 70 to 90 ft.

to the rock ridge or sill. The ridge has a slight rise of

coral rock before the start of the 450 slope which extends to

140 feet. At the 140 foot level, the escarpment begins with a

very sharp drop off 800.

Coral types and biotope data may be obtained from the Technical

Notes TN 7113-80, NEAR SHORE ECOLOGICAL MONITORING AT AUTEC

SITES, U.S. Naval Oceanographic Office, NSTL Station, Bay St.

Louis, MS 39522. In general, our survey confirmed the findings

of the NST.L Reports.

3-3

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Tracer Marine

Upon completion of the deep water survey, a tentative cable

route was surveyed. A small cut in the barrier reef was

found and is noted on the Site 2 marked buoy locations shown

in Figure 3-2. This is the shortest possible route from the

reference buoy area to Site 2. The reef cut was located

during an aerial survey using the Autec Helicopter and subse-

quently confirmed by diver observation.

Figure 3-4 gives latitude and longitude of all buoys placed

at Site 2 including reference buoy. This chart presents water

depth and a description of the bottom at each buoy location.

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4.0 CONCLUSION

Site 1

The bottom conditions around the reference buoy at Site 1 were

very typical. The deep reef was made up o ' scattered heads

with a maximum relief of 4-6 ft. Sand trenches (grooves) run-

ning east and west between the coral spurs diminished seaward

where the sand terraces begin. The first photograph in the

photograph section (page 1) shows the sand grooves. They are

also shown on page 4. The sand terraces shown in photographs

on page 1 and page 3 were large and extended from approxi-

matelv 40 ft. to 65 ft. where the rocky rid qe begins. Coral

spurs (rises between grooves) are shown in numerous photographs

pages, 1, 2, 3, 4. Page 6 gives a good view on the rocky ridge

where the slope to 140 ft. level begins. No major obstructions

were found during the dive survey at Site 1.

Site 2

Bottom conditions around the reference buoy at Site 2 were not

typical. The reference buoy anchor clump, shown in photograph

one, page 7, is wedged in coral heads approximately 10 ft. off

the bottom. The deep reef consisted of very large pinnacle

shape buttresses extending from the plateau drop off 45' to

4-1

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Tracor MarineI.%

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approximately 70 ft. of water. These large heads are shown in

photographs on pages 7, 8, 9 and 10. The sand terraces, pages

11 and 12 were in deep water 70 ft. to 90 ft and only one large

terrace was found. The rocky ridge, page 13, was similar to

the ridge at Site 1, however, the coral heads were larger. From

the reference buoy directly in line with the Site 2 dock, a

small reef cut was found and marked with buoys. Pages 15 and

16 show the bottom condition i. this area.0m

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5.0 PERSONNEL

Site 1

o Dennis V. Kembro - Project Manager/Dive Master

o Len Gordon - Project Engineer/Diver

o Richard Counter - Diver

Site 2

0 Dennis V. Kembro - Project Manager/Dive Master

o Len Gordon - Project Engineer/Diver

o Richard Counter - Diver

o Rob Munier - Diver (Program Manager)

0 .

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6.U GENERAL LOG

Sunday, August 21st

1300 -Arrived W-est Palm Beach

1 1-ec

Diving at buoy and marking obstructions.

1 11*: p- :.;I t Inn :*. ()n hu s

174 5~ Arr ived ait dock. Survey compl1ete

1830 -Secure for day.

T,'esd, Auqjust 23i-d

0530 -Chow

070(0 D eparted Site I for Site 2

AS-

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Tracor Marine .

1 VI

*~~ or, i is t mfSad ta-k i nq pl-hotoqraphs

Art - rv:ed it Site 2

* C0800) Loaded dive gear

0') 0 C'nt inued survey of S~tt 2.

1000 -Started setting buoys to shore%

1830 -Secured for day%

Thursday, August 25th

* 0530 - Chow

0730 - Departed Site 1 for Site 2

0830 - Arrived Site 2

*1000 - Began position fixes on buoys

1330 -Completed positioning.

1400 -Chow

*1730 -Back at Site 1. Secured for day.

*b

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Tracer Marine

Friday, August 26th

0700 - Chow

0800 - Unloaded equipment at Site 1

0900 - Started packing equipment for shipment

to West Palm Beach.

1100 - Chow

1400 - Departed AUTEC

1500 - Arrived West Palm Beach N

0- 3

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Tracer MarineN ,

7.0 DIVE EQUIPMENT AND MATERIAL

* Since the maximum depth was approximately 100 feet, scuba

equipment was used for this survey.

Equipment List, Site 1

10 scuba tanks

2-12' Zodiacs with motors

Site l's 16 foot RAR boat with motor

30 concrete blocks (anchors)

1200' " poly line

50 lobster floats :-

U/W measuring tape

Nikonos II 35mm underwater camera, 200ASA, normal lens

Mako scuba compressorA

Divers personnel gear.

Equipment List, Site 2

10 scuba tanks

2-12' Zodiacs with motors

Site l's 20' Zodiac with motor .

2 concrete blocks (anchors)

800' %" poly line

30 lobster floats

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