Multibeam Swath Bathymetric Survey in Bay of Bengal within...
Transcript of Multibeam Swath Bathymetric Survey in Bay of Bengal within...
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CONTENTS
1. Introduction 2
2. Objectives 3
3. Cruise Itinerary 3
4. Participants 4
5. Area of operation 5
6. Survey Equipments and Methodology 6
7. Diary of events 11
8. Acknowledgments 15
Annexure-I Details of survey lines 16
Annexure-II Details of SVP operations 17
Annexure-III Details of Sediment Sampling 18
Annexure-IV Details of SBP & SSS data 19 Annexure-V MBES Calibration Report 20 Annexure-VI SB3012 - Dry-docking works 29 Annexure-VII SB3012 - Scope of dry-docking works 33 Annexure-VIII SB3012 - Service Report 39
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1. INTRODUCTION
Judicious utilization of offshore resources is very vital for the economic prosperity of any
country in the world. The control over the oceans is regulated by the Law of the Sea
Convention of 1982, which came into force on November 16, 1994 and it defines oceanic
jurisdiction for all states. This Law extends the legal right to the coastal states to exploit,
develop, manage and conserve all resources to be found in the water and in the sub-soil of
an area extending 200 nautical miles from its shore.
Fig 1: Zones of National Jurisdiction under the Law of Sea Convention of 1982
India has the 12th largest Exclusive Economic Zone (EEZ) in the world with 23,05,143 km2
along its 7516.6 km coastline (including the coastline of Andaman and Nicobar Islands and
Lakshadweep Islands). This constitute about two-third of the land area of the country.
Realizing the need to be cognizant about the enormous potentials of our country’s EEZ, the
government of India has decided to prepare a comprehensive map of entire EEZ of India
during the 11th Five Year Plan (2007 - 2012) and National Centre for Antarctic and Ocean
Research (NCAOR), Goa has been appointed as the nodal agency for the implementation of
this programme.
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Fig 2: Map showing India’s EEZ
2. OBJECTIVES
The primary objective of the SK-282 cruise was to undertake multibeam bathymetric
survey in the Western Andaman region within the EEZ of India. This survey was carried
out under the EEZ programme with the objective of preparing a topographic map. Sediment
sampling was also carried out for the Andaman Project.
The other objectives include:
1. Magnetic data collection along survey tracks
2. Sub-bottom profiling data collection along survey tracks
3. Trials of Side Scan Sonar
3. CRUISE ITINERARY The SK-282 cruise sailing started from Chennai Port at 1930 hours on
05th march 2011. After the successful completion of the survey the vessel returned to
Chennai port on 03rd April 2011.
Departure: Chennai 05.03.2011
Arrival: Chennai 03.04.2011
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4. PARTICIPANTS
A total of 13 scientific personnel participated in the SK-282 cruise, which includes Six
Scientists and Two Assistants from NCAOR, One SB3012 Expert from M/s L-3
Communications ELAC-Nautik (Germany) and Four Engineers from Norinco Pvt. Ltd.
List of Participants:
SN NAME Organization Designation
01 Abhishek Tyagi NCAOR, Goa Chief Scientist
02 Avinash Kumar NCAOR, Goa Scientist
03 Ajeet Kumar NCAOR, Goa Scientist
04 Vineesh T. Chacko NCAOR, Goa Scientist
05 Ashlesa Saxena NCAOR, Goa Scientist
06 Gireesh R. Nair NCAOR, Goa Scientist
07 Amey Hajare NCAOR, Goa Project Tech. Assistant
08 Bibin Abraham NCAOR, Goa Shipboard Assistant
09 Joerg Brockhoff L-3 Comm. ELAC-Nautik Manager System Services
10 K. Madhusudan Norinco Pvt. Ltd. AMC Engineer
11 T. Ramesh Norinco Pvt. Ltd. AMC Engineer
12 E. Vasantharaja Norinco Pvt. Ltd. AMC Engineer
13 Palani Sakthivel Norinco Pvt. Ltd. AMC Engineer
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5. AREA OF OPERATION
The present cruise was carried out in the Western Andaman EEZ region in pre-determined
survey block. A total area of around 10410 km2 was covered during the bathymetric survey.
The bathymetric data was collected along ~5200 Lkm tracks.
Fig 3: Area of operation for the SK-282 cruise
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6. SURVEY EQUIPMENTS & METHODOLOGY
1. SB-3012 Multibeam Echosounder System:
SeaBeam 3012 Multibeam Echosounder onboard ORV-Sagar Kanya was used to
carry out the present survey. The SB3012 is a 12 KHz, max. 201 beam sonar system,
with an effective 150 of swath. The system has a beam width of 1 degree at nadir and
is capable of depths 200 metres to 11000 metres. The swath coverage depends upon
the beam angles. Multi beam system provides full swath coverage with minimum
beam angle. The beam angle and water depth are as:
Depth (m) Beam Angle (°) 200 - 500 ≈ 150 (Max) 500 – 1500 ≈ 145 1500 - 2700 ≈ 140 >4000 ≈ 90
The Multibeam survey was carried out using standard practice. The lines have been
run in order to obtain more than 20% coverage at maximum speed of 9 knots. Lines
are run in order to paint the area by following the outer beams of previous lines. A
line spacing of 3 nautical miles was maintained for the first two lines. Navigational
and attitude information is provided by C-NAV DGPS system. Ship track was
maintained within ±10 m. Total 15 Sound velocity profiles were taken from the
survey area. The specifications of the system are as:
Make: L3-Communications Elac-Nautik
No. of beams: 201
Swath coverage: 4 x Water Column
Frequency of operation: 12 KHz
Technology: Full motion compensation (Swept beam technology)
Depth performance: Max. 11,000 m.
Acquisition software: Hydrostar
Data Processing software: Eiva NaviPac
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The complete Multibeam system comprises of many sub systems:
Surface Sound velocity (SSV): The surface sound velocity profiler is an underway
ocean profiling system that can collect the water sound speed profiles while the vessel
is still in motion.
Side Scan Imagery: Online printer provided with system and annotation interval was
set at 30 minutes.
Gyro and Motion sensor: Multibeam system uses Octans sensor for Gyro and
motion input. Octans is an IMO-compliant survey-grade gyrocompass with an integral
motion sensor.
Positioning System: C-NAV DGPS subsystem is used for positioning accuracy. C-
Nav GcGPS corrections are similar to other wide area DGPS system such as the
Federal Aviation Administration’s (FDA) wide area augmentation system (WAAS).
The C-Nav GPS receiver can accept two different GcGPS correction service message
formats. The C-Nav, dual frequency, GPS user equipment receives either of these
corrections broadcast from the communications satellite, applies them its own
observed, refraction corrected C/A code, dual frequency observations, and performs a
navigation solution. The resulting corrected GPS position; velocity and time (PVT)
are output from the C-Nav equipment to other subsystems on the
platform/vehicle/vessel to support the navigation positioning control requirements.
Network Timeserver with GPS synchronized time base: LANTIME (Local Area
Network TIMEserver) provides a high precision time base to a TCP/IP network
(stratum-1-server). The NTP (Network Time Protocol) is used to synchronize all NTP
clients with the reference. LANTIME/GPS is a set of equipment composed of a
satellite controlled clock GPS167, a single-board computer with integrated network
board and a power supply, all installed in a metal 19” rack on the single-board
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computer flash disk. After the network connection has been bestialized the time server
can also be configured and monitored remotely from a workstation via TELNET or
FTP.
Network Time Protocol (NTP): NTP is a common method for synchronization of
hardware clocks in local and global networks. Timeservers synchronize themselves by
a reference time source, such as a radio controlled clock, GPS-receiver or modem
time distribution. Stratum-1-servers distribute their time to several clients in the
network which are called stratum-2.
A high precision synchronization is feasible because of the several time references.
Every computer synchronizes itself buy up to three valued time sources. NTP enables
the comparison of the hardware times and the adjustment of the own clock, a time
precision of 128ms, often better than 50ms, is possible.
Sound Velocity Profiler (SVP): MIDAS SVP Sound Velocity Profiler was used to
measure the sound velocity profile. Its uses the advanced digital signal processing
technique that removes virtually all noise from the data. The sound pulse is both
transmitted and received, and allows measure the time of flight with a resolution of
1/100th of a nanosecond (10-11 seconds). The unit is fitted with the sound velocity,
pressure and temperature sensors. The sound
velocity profiler casting was carried out at 15
stations with depths ranging from 1000 to 2000
meters. The sound velocity and temperature is
plotted against water depth and analyzed.
Data Acquisition Software: Windows workstation was installed prior to SK-282
cruise and tested satisfactory. The Old Sun workstation will now be utilized as a
standby in case of any problems with the Windows workstation. Windows
Fig 4: Sound Velocity Profiler
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workstation is the operator control station and Hydrostar the operator control station
software. Windows workstation performs all commands to operate the SB3012
system. Hydrostar is a data acquisition and control system for Multibeam sonar. It
also acts as an interface for various external sensors (position, motion, heading and
sound velocity sensors).
NaviPac software is used for navigation and data acquisition from various feeds such
as GPS, Gyro, Motion sensor etc. NaviPac also allows the navigator to perform all
phases of surface navigation, to view all sensor data, to perform changes in navigation
principles and components. The programme reads all basic information from the setup
DB, present all available stations and let the navigator specify the stations wanted.
NaviPac is installed in Windows NT workstation. NaviEdit, NaviModel and NaviPlot
are the software to edit the data and create the model and plot the final chart.
Fig 5. Data Flow diagram
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2. Sub Bottom Profiler
GeoAcoustics Sub bottom profiler onboard was used to collect the sub bottom profile
data along all the lines. SBP contains four units:
GeoPro data processing unit: It is the main processing unit and MacOS is the
operating system. GeoPro software, which is a complete software system, installed in
the main unit and software features, such as acquisition, target analysis, mosaicing
and seismic processing are all part of one software application.
GeoPulse 5430A Transmitter: It is a stand-alone transmitter of 10 kW maximum
power output in a frequency range of 2 KHz to 12 KHz.
GeoPulse Receiver: The receiver is a universal amplifier/filter for use in sub bottom
profiling. The receiver, combining many functions, replaces many single function
boxes that would otherwise create space as well as interference problems.
Sidescan Sonar: Deck unit for side scan sonar operation is also installed in rack.
3. Magnetometer
The Geometrics Inc Ceisium Vapour marine
magnetometer (G-882) was used to collect
magnetic data along survey tracks. The
magnetometer fish is towed behind the ship at
length three times the length of the ship.
Technical Specifications of the G-882:
Operating Principle : Self-Oscillating split-beam Cesium Vapour
Operating Range : 20,000 to 100,000 nT
CM-221Counter Sensitivity : <0.004nT/Hz rms. Up to 10 samples per second.
Heading error : 1nT (over entire 360E equatorial and polar spin)
Absolute accuracy : < 1nT throughout Range
Output : RS-232 at 1200 to 19200 Baud
Operating Temperature : -30°F to +122°F (-35°C to +50°C)
Storage Temperature : -48°F to +158°F (-45°C to +70°C)
Fig 6: Marine Magnetometer
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Fig 7 : Gravity corer
Altitude : Up to 30,000 ft (9,000 m)
Water tight : Up to 9000 ft (2750m) depth operation
Power : 24 to 32 VDC, 0.75 amp at turn-on & 0.5 amp thereafter.
4. Sediment Samplers
Gravity corer was used for sediment sample collection at one location each. The
gravity corer allows researchers to sample and study sediment layers at the bottom of
oceans. The corer consists of an open-
ended tube with a lead weight and a trigger
mechanism that releases the corer from its
suspension cable when the corer is
lowered over the seabed and a small
weight touches the ground. The corer falls
into the seabed and penetrates it to a depth
of up to 6 m.
7. DIARY OF EVENTS
DATE EVENTS 05.03.2011 Vessel sailed out from Chennai Port and RFA at 2024hrs.
Vessel proceeding for Pitch Calibration site. 2330hrs – Portside PM motors stopped functioning.
06.03.2011 Posn @ 0800hrs – 13 29’N, 080 40’E; Drifting, Slight sea & swell.
0015hrs – Vessel arrived at Survey site and stopped for carrying out SVP cast.
During the operation the DSW wire rope slipped from the traction winch rollers. SVProfiler was heaved onboard with Atlas crane by fixing nylon ropes to DSW wire. The DSW wire rope problem was rectified and tried lowering the SVP again.
During the second operation about 10m wire was paid out when the DSW wire again slipped from the traction winch rollers and got stuck between a roller (facing bow) and main body.
0530hrs- SVProfiler was again heaved onboard with Atlas crane by fixing nylon ropes to DSW wire.
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1230hrs - Problem was rectified and about 30m DSW wire rope was cut as the wire was kinked and few threads seen parted (where the wire was stuck).
1300 to1430hrs - Carried out trials with weights upto ~100m and heaved/lowered several times to check stability.
SVP cast upto 2000m water depth before BOL-pitch calibration (Reverse course).
2300hrs - Started survey for Pitch Calibration in Reverse course track.
Problem with Starboard side PM's (Tachometer wheel displaced) at ~2345hrs rectified and reoccupied the track from beginning.
07.03.2011 Posn @ 0800hrs – 13 18.8’N, 080 02.2’E; SOG - 7.3kn, COG- 91deg, Depth- 3333m, sea state -2, Slight sea & swell.
0030hrs - Carried out verification of Pitch Offset after performing surveys on the predecided track using calculated pitch offset values.
Confirmed pitch calibration successful.
0400hrs - Proceeding to Andamans for recon MB survey of coring locations.
0500hrs - Magnetometer deployed.
Problem with Portside PM motors could not be rectified yet.
At present propulsion on Starboard side PM motors only and max. safe speed ~ 7knots.
08.03.2011 Posn @ 0800hrs – 13 22.5’N, 083 51.7’E; SOG – 6.4kn, COG- 89deg, Depth- 3269m, sea state -2, Slight sea & swell.
In transit to Andamans, GC-01 station.
Underway geophysical data collection incl. MB, SBP, MAG. 09.03.2011 Posn @ 0800hrs – 13 27.9’N, 086 45.7’E; SOG –7.2kn, COG- 88deg,
Depth- 3070m, sea state -2, Slight sea & swell.
In transit to Andamans. 10.03.2011 Posn @ 0800hrs – 13 29.04 N 089 39.4 E, SOG - 6.1kn, COG- 90deg,
Depth- 2929m, sea state -2.
In transit to Andamans. 11.03.2011 Posn @ 0800hrs – 13 30.2 N 092 12.7 E, SOG - 6.5kn, COG- 90deg,
Depth- 2092m, sea state -4, moderate rains & wind.
1005hrs- Mag towfish heaved onboard for GC operation 0950hrs.
1150hrs- GC-01 station at 92 23 20.432E, 13 30 23.0034N; Depth- 1162m; successful.
SVP cast at same location upto 1000m depth.
1350hrs - started sailing towards GC-02 station.
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1820hrs- GC-02 station at 92 18 47.401E, 13 09 12.130N; Depth- 1058m; successful.
1930hrs- MBES survey on Two parallel tracks to east of survey track between GC-01 & GC-02.
12.03.2011 Posn @ 0800hrs, 12 37.73 N 092 17.15 E, SOG - 6.1kn, COG- 185deg, Depth- 616m, sea state -4, drizzling.
0400hrs- MBES Survey completed and proceeding to GC-03 station.
1420hrs- GC-03 station at 92 14 47.401E, 13 09 12.130N; Depth- 962m; successful.
1500hrs- Proceeding to Port Blair for repairs of Portside PM motors. 13th to 22.03.2011
At Port Blair for critical ship repairs.
22.03.2011 1700hrs - Pilot onboard
1736hrs - Pilot away
1800hrs - RFA
Sailing to survey area BLOCK-01. Shall cover seismic line E7 during approach, as discussed onboard.
23.03.2011 Posn @ 0800hrs, 12 15.591 N, 091 54.089 E, SOG - 8.8kn, COG- 343deg, sea state 3.
1100hrs - BoL-Seis E7, underway data collection incl. MBES, Mag & SBP.
2350hrs - EoL-Seis E7. 24.03.2011 Posn @ 0800hrs, 13 23.693 N, 089 59.998 E, SOG - 8.4kn, COG- 000deg,
Depth - 2906m , sea state 3.
0015hrs - DSW trials, OK.
0130hrs - SVP cast, few issues reported by Operators to Duty Engineer/ Chief Engineer.
0541hrs - L1 in Block-01 started. Time Server jumps date by nine months - unknown reason, rectified. 10 miles track was reoccupied.
25.03.2011 Posn @ 0800hrs, 15 07.762 N, 089 56.658 E, SOG - 8.2kn, COG- 180deg, Depth - 2687m , sea state 3.
0200hrs - EOL-L1. 0205hrs - Mag onboard.
0225hrs - SVP cast.
0440hrs - Mag deployed. 0605hrs - BOL-L2.
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0835hrs - MBES pinging but stopped receiving data. Restarted - working ok. 6nm track reoccupied.
1637hrs - EOL-L2.
1715hrs - BOL-L3. 26.03.2011 Posn @ 0800hrs, 14 40.935 N, 089 53.050 E, SOG - 8.2kn, COG- 000deg,
Depth - 2740m , sea state 3.
0646hrs - EOL-L3.
0814hrs - BOL-L4.
2045hrs - EOL-L4.
2118hrs - BOL-L5. 27.03.2011 Posn @ 0800hrs, 14 15.508 N; 089 45.621 E, SOG - 8.6kn, COG- 359deg,
Depth - 2831m , sea state 3.
0812hrs - EOL-L5.
0815hrs - Mag onboard. 0830hrs - SVP cast.
1020hrs - Mag deployed.
1120hrs - BOL-L6.
2142hrs - EOL-L6.
2154hrs - Mag onboard.
2215hrs - SVP cast. 28.03.2011 Posn @ 0800hrs, 13 45.083 N; 089 38.020 E, SOG - 8.7kn, COG- 000deg,
Depth- 2912m , sea state 3.
0015hrs - Mag deployed.
0030hrs - BOL-L7.
0920hrs - EOL-L7.
1030hrs - BOL-L8.
1922hrs - EOL-L8.
1935hrs, Proceeding to Chennai. 29.03.2011 Posn @ 0800hrs, 13 24.647 N, 088 27.872 E, SOG - 8.8kn, COG- 268deg,
sea state 3.
Sailing to Chennai. 30.03.2011 Posn @ 0800hrs, 13 17.311 N; 085 06.877 E, SOG - 8.7kn, COG- 265deg,
sea state 2.
Sailing to Chennai.
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31.03.2011 Posn @ 0800hrs, 13 08.983 N; 081 56.047 E, SOG - 8.5kn, COG- 270deg, Depth - 3426m, sea state 2.
2045-2145hrs, Side Scan Sonar trials carried out, Working OK.
Sailing to Chennai. 01.04.2011 Posn @ 0600hrs, 13 04.082 N; 080 24.178 E, SOG - 3.7kn, COG- 225deg,
sea state 3.
0624hrs, Anchored in outer anchorage at posn - 13 03.849N, 80 22.608E.
03.04.2011 Vessel berthed at Chennai Port. All scientists Disembarked. 7. ACKNOWLEDGEMENTS
Chief Scientist and the scientific participants of SK-282 cruise would like to express
their deep sense of gratitude to the Director, NCAOR for entrusting the
responsibilities of carrying out the assignments as well as for his constant
encouragement, motivation and support for the programme. Thanks are also due to
Dr. Anil Kumar, Mr. M.M. Subramaniam and the SK cell for their timely support,
cooperation and logistic arrangements. Onboard technical support offered by the
engineers from m/s NORINCO is gratefully acknowledged. Last but not least, the
Master and his crew deserve great appreciation for their exceptional support offered
during all the scientific operations.
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ANNEXURE – I
DETAILS OF SURVEY LINES
Date Time Longitude (E)
Latitude (N) Speed HeadingDepth(m)
Filename Remarks
23/03/11 05.30 91°46’58.59 12°38’27.89 8 289.9 2571 E7-20110323051221
BOL-E7
23/03/11 17.30 90°04’43.29 13°07’45.40 8.6 293.1 2966 E7-20110323173201
EOL-E7
24/03/11 05.41 89°59’55.61 13°27’01.25 6.7 036.7 2936 Block -1-20110324054044
BOL-L1
24/03/11 20.30 90°00’02.15 15°28’11.86 4.2 355.3 2625 Block -1- 20110324201008
EOL-L1
25/03/11 00.37 89°56’43.49 15°22’40.55 6.01 187.5 2646 Block-1-20110325002623
BOL-L2
25/03/11 16.37 89°56’18.03 13°26’51.84 8.1 173.7 2934 Block -1-20110325161749
EOL-L2
25/03/11 17.15 89°52’36.06 13°27’05.31 7.9 007.5 2913 Block -1- 20110325170348
BOL-L3
26/03/11 06.46 89°53’17.52 15°17’41.96 7.9 344.3 2661 Block -1- 20110326062748
EOL-L3
26/03/11 08.14 89°49’45.22 15°09’54.12 7.1 176.8 2683 Block -1- 20110326075637
BOL-L4
26/03/11 20.45 89°48’54.26 13°27’00.88 9.0 179.0 2928 Block -1- 20110326203243
EOL-L4
26/03/11 21.18 89°45’09.14 13°27’24.52 9.0 347.2 2930 Block -1- 20110326211817
BOL-L5
27/03/11 08.12 89°46’04.89 15°02’45.41 2.7 359.8 2706 Block -1- 20110327080933
EOL-L5
27/03/11 11.20 89°42’29.59 14°55’35.94 9.4 180.2 2744 Block -1- 20110327110746
BOL-L6
27/03/11 21.42 89°41’29.81 13°26’58.02 6.0 173.7 2938 Block -1- 20110327213129
EOL-L6
28/03/11 00.30 89°37’47.12 13°27’33.95 8.7. 011.2 2933 Block -1- 20110328001224
BOL-L7
28/03/11 09.20 89°38’42.18 14°46’00.91 8.6 355.3 2773 Block -1- 20110328090712
EOL-L7
28/03/11 10.30 89°34’30.72 14°39’45.17 7.8 175.5 2821 Block-1- 20110328101427
BOL-L8
28/03/11 19.22 89°33’59.79 13°27’04.03 8.4 211.0 2932 Block-1- 20110328191312
EOL-L8
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ANNEXURE – II
DETAILS OF SVP OPERATIONS
Date Start Time
End Time
Longitude (E) Latitude (N) Depth (m)
File name
11/03/11 12.45 13.35 92°23’30.39 13°30’22.87 1165 File 03.sva
23/03/11 18.30 22.57 89°53’18.35 13°09’49.61 2961 File 05.sva
24/03/11 20.52 23.00 90°00’03.19 15°28’16.52 2624 File 06.sva
27/03/11 08.30 10.10 89°46’05.45 15°03’04.39 2706 File 07.sva
27/03/11 22.15 23.57 89°41’01.00 13°25’34.93 2934 File 09.sva
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ANNEXURE – III
DETAILS OF SEDIMENT SAMPLING
Stn. Latitude (N)
Longitude (E)
Depth (m)
Recovery Remarks
SK- 282/ GC-01
13⁰ 30’ 23.0034
92⁰ 23’ 20.432
1162 239 cm Subsampling is done with 5 cm. intervals. Total 48 subsamples. Half of the core preserved as untouched. Clayey silt greyish colour sediments. Down core mostly compact clay
SK- 282/ GC-02
13⁰ 09’ 12.223
92⁰ 18’ 47.369
1058 190 cm Subsampling is done with 5 cm. intervals. Total 38 subsamples. Half of the core preserved as untouched. 0-40 cm. Coarse sand grains with mud greyish in colour 40-85cm. Brownish grey colour sediment mostly sandy clay. 85-110 cm. brownish black colour. Clay content increasing down core. 110-190cm. clay content is more. Greyish black in appearance
SK- 282/ GC-03
12⁰ 13’ 27.6204
92⁰ 14’ 06.8238
690 226 cm Subsampling is done with 5 cm intervals. Total 38 subsamples. Half of the core preserved as untouched. 0-50 cm. Greenish grey in colour 50-150cm. Brownish grey colour sediment contain shell fragments sand and clay. 150-226 cm. Dark grey colour. Compactness of clay increasing down core.
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ANNEXURE - IV
DETAILS OF SUB BOTTOM PROFILER DATA
Sl. No Date File Name 01 05.03.2011 SBP 20110305.Sit 02 06.03.2011 SBP 20110306.Sit
03 07.03.2011 SBP 20110307.Sit SBP 20110307A.Sit
04 08.03.2011 SBP 20110308.Sit SBP 20110308A.Sit
05 09.03.2011 SBP 20110309.Sit SBP 20110309A.Sit
06 10.03.2011 SBP 20110310.Sit SBP 20110310A.Sit
07 11.03.2011 SBP 20110311.Sit SBP 20110311A.Sit
08 12.03.2011 SBP 20110312.Sit SBP 20110312A.Sit
09 22.03.2011 SBP 20110322.Sit
10 23.03.2011 SBP 20110323.Sit SBP 20110323A.Sit SBP 20110323B.Sit
11 24.03.2011 SBP 20110324.Sit SBP 20110324A.Sit
12 25.03.2011 SBP 20110325.Sit SBP 20110325A.Sit
13 26.03.2011 SBP 20110326.Sit SBP 20110326A.Sit
14 27.03.2011 SBP 20110327.Sit SBP 20110327A.Sit
15 28.03.2011 SBP 20110328.Sit SBP 20110328A.Sit
16 29.03.2011 SBP 20110329.Sit SBP 20110329A.Sit
17 30.03.2011 SBP 20110330.Sit SBP 20110330A.Sit
18 31.03.2011 SBP 20110331.Sit
DETAILS OF SIDE SCAN SONAR DATA
Sl. No File Name 01 SK282-SSS-TRIAL 02 SK282-SSS-TRIAL01
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- * End of Report * -