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Acoustic basement: Its relevance to Karwar port development

DRS at CSIR-National Institute of Oceanography

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Title Acoustic basement: Its relevance to Karwar port development
 
Creator Veerayya, M.
Almeida, F.
 
Subject port installations
basement rock
acoustics
bathymetry
side scan sonar
seismic arrays
seismic profiles
sediments
 
Description Detailed bathymetric, side-scan sonar and shallow seismic surveys followed by sediment sampling were conducted in Karwar Bay, Karnataka, India to study the surficial geology with special emphasis on basement configuration for planning and development of an all-weather port. The depths in the survey area vary from 1 to 16 m. The seabed is fairly smooth and relatively steep from the shore up to 6 m, beyond which it slopes gently seaward. Sonographs indicate tidal furrows between 7 and 8.5 m, while rocks occur 0.5 km north of the approach channel at 9.5 m and NE of Karwar Head near the entrance to Baitkol Cove. Sporadically rock exposures or hard sediment patches occur mostly in the north and 0.2 to 0.3 km south of the apporach channel west of 9 m and seaward of 11 m isobaths. Seismic profiles revealed a well difined acoustic basement beyond 9 m, south of Tuming basin and near Mandal Island. The irregular basement is overlain by 12-15 m thick sediments, soft clays at the surface underlain by stiff clays or very fine sands/silts. At places it even reaches 2-3 m below the seabed. Bedrock at shallow depths at the offshore end of the approach channel and south of the Turning basin requires special underwater blasting techniques.
 
Date 2009-01-21T10:54:06Z
2009-01-21T10:54:06Z
1996
 
Type Conference Article
 
Identifier International Conference in Ocean Engineering COE '96, 17-20 Dec 1996. Proceedings, 404-409p.
http://drs.nio.org/drs/handle/2264/2227
 
Language en
 
Rights Copyright [1996]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Allied, Chennai (India)