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Implications of post-disturbance studies on the grain size of the sediments from the Central Indian Basin

DRS at CSIR-National Institute of Oceanography

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Title Implications of post-disturbance studies on the grain size of the sediments from the Central Indian Basin
 
Creator Valsangkar, A.B.
 
Subject polymetallic nodule
Central Indian Basin
Environmental Impact Assessment
seabed mining
 
Description Indian Deep-Sea Environment Experiment (INDEX) was conducted by simulating benthic disturbance and resuspension of the sediments in 3 km ยด 200 m narrow strip at 5300 m water depth in the Central Indian Basin (CIB). Using the conventional coring methods, pre- and post-disturbance data have been compared to predict the probable direction of the plume movement on the seabed. Studies on 84 subsections of 10 box cores show that the disturbance at places was effective up to 25 cm depth. Postdisturbed samples collected from the pre-disturbed locations show an increase of 10 to 27% silt and clay, and indicate that they were the major component of the plume. It has been shown that for such studies the silt and clay can be used as effective indicators of the plume movement. The studies revealed that the plume has migrated at least up to 2 km in the southwest direction and 1 km south of the disturbed zone (DZ). Increase in the surface clay content is ascribed to mixing of the sediments from deeper sections due to the benthic disturbance.
 
Date 2006-08-28T07:48:31Z
2006-08-28T07:48:31Z
2001
 
Type Journal Article
 
Identifier Current Science, vol.81(10), 1365-1373pp.
http://drs.nio.org/drs/handle/2264/277
 
Language en
 
Format 542720 bytes
application/pdf
 
Publisher Indian Academy of Sciences