NDLI: Tools and techniques for deep water sediment sampling around a ship wreck

Content Provider	IEEE Xplore Digital Library
Author	De Moustier, C. Wild, W. Spiess, F.N. Jonke, P. Jabson, D. Austin, G. Price, D. Zimmerman, R.
Copyright Year	1998
Description	Author affiliation: Marine Phys. Lab., Scripps Instn. of Oceanogr., La Jolla, CA, USA (De Moustier, C.)
Abstract	In August 1997, a series of near-bottom operations were conducted in an acoustic transponder net deployed around the wreck of the ex USS-Agerholm, about 130 nm offshore Southern California in 800 m of water depth. The Marine Physical Laboratory's Deep Tow Control Vehicle equipped with two orthogonal horizontal thrusters, a sector scanning sonar, cameras, lights, a navigation sonar, and an altimeter sonar was used to first locate the wreck in a debris field spanning about 40,000 m/sup 2/. Unlike conventional neutrally buoyant ROVs the control vehicle can handle payloads of a few thousand kilograms, depending on the water depth. The 0.680" electromechanical tow cable from which the vehicle and payload are suspended carries the full load and provides electrical power. The vehicle provides lateral position control. We used this capability to suspend a 0.25 m/sup 2/ box core below the vehicle and to take sediment samples at locations determined via transponder navigation. In spite of moderately rough weather conditions with 20 knot winds and 1.5-3 m seas on average, and in spite of operations from a ship without dynamic positioning, eight usable core samples were taken at ranges of 10 m to 1 km from the wreck. The vehicle was also used to deploy four sediment traps and an ADCP at precisely located bottom positions on a 50 m radius around the wreck. The relative merits and drawbacks of the tools and techniques used for these operations are discussed in this paper.
Starting Page	7
Ending Page	10
File Size	734501
Page Count	4
File Format	PDF
ISBN	0780342739
DOI	10.1109/UT.1998.670049
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-04-17
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sediments Sampling methods Marine vehicles Sonar navigation Transponders Payloads Laboratories Lighting control Cameras Remotely operated vehicles
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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