nd-ri69 646 autec ocean nauldoun dive survey site i … · 2014-09-27 · 2.0 survey date site 1...
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ND-RI69 646 AUTEC OCEAN NAULDOUN DIVE SURVEY SITE I OND SITE,2(U) Is'ITRACOR/NARINE INC FORT LRUDERDALE FL 31 AUG 63
UNCLSSIIEDCNES/NAVFAC-FPO-8361 NUGSS-BI-D-5276 / /9 N
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S JUN 13
FPO 8361
*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
C-
DL%"TM0T~lN STATEMNAA:p1rv1d 1o: public leeap~
86 6 12 127
-VYIY .7r .7f- '1 . -V -, %r
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
* ~ **.*.
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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
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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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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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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
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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 7AXREFERENCE
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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
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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
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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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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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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
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Tracor Marine .
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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.
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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
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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
U/W measuring tape
Nikonos TI 35 mm underwater camera, 200ASA, normal lens
Mako scuba compressor
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