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Seabottom backscatter studies in the western continental shelf of India

DRS at CSIR-National Institute of Oceanography

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Title Seabottom backscatter studies in the western continental shelf of India
 
Creator Chakraborty, B.
Pathak, D.
 
Subject bottom scattering
backscatter
echo surveys
echosounders
sound reflection
sound attenuation
sediments
bed roughness
 
Description The study is initiated to observe the interaction effects of the sound signal with three different sediment bottoms in the shelf area between Cochin and Mangalore in the western continental shelf of India. An echo signal acquisition system has been designed and interfaced with the 12kHz echosounder installed onboard ORV Sagar Kanya. The reflection coefficients including attenuation at the seawater/bottom interface are computed in the three different sediment areas based on the sediment mean grain size. The experimental coherent reflection coefficients are calculated using the attenuation corrected reflection coefficients and the normalized cross-correlation between successive backscatter echo signal waveforms in those areas. Further, analyses conducted by determining the echo peak Probability Density Function (PDF) and matching them with the experimental echo peak histograms provide root mean square (rms) roughness amplitude in the three different survey areas. The rms roughness values are used to compute the coherent reflection coefficients. An attempt to establish concurrence between the coherent reflection coefficients based upon the rms roughness amplitude and the experimental coherent reflection coefficients using the backscatter echo signals, reveals the importance of seawater/bottom interface roughness in the coarse grained sediment bottoms like sand and silty sand. The existence of microtopographic features are responsible for the seawater/bottom interface roughness. However, in the fine grained sediment area, the bottom does not contain any such feature
 
Date 2009-01-10T10:20:26Z
2009-01-10T10:20:26Z
1999
 
Type Journal Article
 
Identifier Journal of Sound Vibration, Vol.219; 51-62p.
http://drs.nio.org/drs/handle/2264/1754
 
Language en
 
Rights Copyright [1999]. 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 Academic Press