HINDOO cruise deep-sea channel survey in the Bay of Bengal

Moe Kyaw Thu; Hidekazu Tokuyama; Masafumi Murayama; KH 00-5 scientific party

doi:10.5575/geosoc.107.XIX

Moe Kyaw Thu, Hidekazu Tokuyama, Masafumi Murayama, KH 00-5 scientific party

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JOURNAL FREE ACCESS

2001 Volume 107 Issue 11 Pages XIX-XX

DOI https://doi.org/10.5575/geosoc.107.XIX

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Published: 2001 Received: August 29, 2001 Available on J-STAGE: November 26, 2010 Accepted: October 31, 2001 Advance online publication: - Revised: -
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Date of correction: November 26, 2010 Reason for correction: - Correction: ABSTRACT Details: Wrong : During Leg 4 of KH-00-5 (Hakuho-maru INDian Ocean Observation Cruise: HINDOO Cruise), we conducted swath bathymetry survey using the SeaBeam 2120 system (20 kHz) together with a 3.5 kHz sub-bottom profiler to map the bathymetric features of the submarine channels of the Bengal Fan (Emmel and Curray, 1985), and to calculate the inflow sediment volume from the Indian subcontinent since the Last Glacial Maximum (LGM). Piston and multiple cores were taken for various analyses to understand more on the history of Himalaya- Karakoram mountain ranges under continent-continent collision and its consequent climatic changes.
Swath bathymetric profiles are not distinct due to the smooth slopes, however it is useful to trace submarine channels. Two channel types, active and old channels, are identified both on swath bathymetry and sub-bottom profiles. Active channels are characterized by V-shaped deep and narrow structures inside the channel (Figs.3, 5). High channel levees show parallel strong reflectors, and has slumping down channel walls with stepping features at some places. Differ from the active channels, old channels are characterized by U-shaped wide and shallow structures (Figs.4, 6). Strong and transparent reflectors which are identified inside channel levees, might be overbank fine-grained sediments paralleling the subbottom (Damuth, 1980).
Right : During Leg 4 of KH-00-5 (Hakuho-maru INDian Ocean Observation Cruise: HINDOO Cruise), we conducted swath bathymetry survey using the SeaBeam 2120 system (20 kHz) together with a 3.5 kHz sub-bottom profiler to map the bathymetric features of the submarine channels of the Bengal Fan (Emmel and Curray, 1985), and to calculate the inflow sediment volume from the Indian subcontinent since the Last Glacial Maximum (LGM). Piston and multiple cores were taken for various analyses to understand more on the history of Himalaya- Karakoram mountain ranges under continent-continent collision and its consequent climatic changes.
Swath bathymetric profiles are not distinct due to the smooth slopes, however it is useful to trace submarine channels. Two channel types, active and old channels, are identified both on swath bathymetry and sub-bottom profiles. Active channels are characterized by V-shaped deep and narrow structures inside the channel (Figs.3, 5). High channel levees show parallel strong reflectors, and has slumping down channel walls with stepping features at some places. Differ from the active channels, old channels are characterized by U-shaped wide and shallow structures (Figs.4, 6). Strong and transparent reflectors which are identified inside channel levees, might be overbank fine-grained sediments paralleling the subbottom (Damuth, 1980).

Date of correction: November 26, 2010 Reason for correction: - Correction: PDF FILE Details: -

Abstract

During Leg 4 of KH-00-5 (Hakuho-maru INDian Ocean Observation Cruise: HINDOO Cruise), we conducted swath bathymetry survey using the SeaBeam 2120 system (20 kHz) together with a 3.5 kHz sub-bottom profiler to map the bathymetric features of the submarine channels of the Bengal Fan (Emmel and Curray, 1985), and to calculate the inflow sediment volume from the Indian subcontinent since the Last Glacial Maximum (LGM). Piston and multiple cores were taken for various analyses to understand more on the history of Himalaya- Karakoram mountain ranges under continent-continent collision and its consequent climatic changes.
Swath bathymetric profiles are not distinct due to the smooth slopes, however it is useful to trace submarine channels. Two channel types, active and old channels, are identified both on swath bathymetry and sub-bottom profiles. Active channels are characterized by V-shaped deep and narrow structures inside the channel (Figs.3, 5). High channel levees show parallel strong reflectors, and has slumping down channel walls with stepping features at some places. Differ from the active channels, old channels are characterized by U-shaped wide and shallow structures (Figs.4, 6). Strong and transparent reflectors which are identified inside channel levees, might be overbank fine-grained sediments paralleling the subbottom (Damuth, 1980).

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