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Model-based seafloor characterization employing multi-beam angular backscatter data - A comparative study with dual-frequency single beam

DRS at CSIR-National Institute of Oceanography

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Title Model-based seafloor characterization employing multi-beam angular backscatter data - A comparative study with dual-frequency single beam
 
Creator Haris, K.
Chakraborty, B.
De, C.
Desai, R.G.P.
Fernandes, W.A.
 
Subject seafloor mapping
sediment characteristics
backscatter
multibeam sonar
 
Description Sediment geoacoustic inversion results are estimated employing a multi-beam (MB) echo-sounding system operable at 95 kHz. To characterize the western continental shelf of India (off Goa) seafloor, MB backscatter signals were acquired along with grab sediment samples. The substrate type and roughness of the site were estimated using the composite roughness scattering model with the measured backscatter values. The seafloor parameters, namely mean grain size (M sub(phi)); roughness spectrum strength (w sub(2)) and exponent (gamma sub(2)); and sediment volume parameter (sigma sub(2)), for coarse and fine grain sediments are estimated by employing the MB system. These parameters have also been estimated at two other frequencies (33 and 210 kHz) and are compared to the ground truth data to provide sufficient support in validating the model results and increasing the understanding of the shelf seafloor processes. Distinct interclass separations between the sediment provinces are evident from the estimated mean grain size M sub(phi) and water-sediment interface roughness w sub(2). The seafloor parameters for coarse and fine grain sediments derived from the 95 kHz MB data are consistent with the sediment sample data as well as with the inversion results obtained using backscatter data at 33 and 210 kHz from the same locations.
 
Date 2012-01-03T04:56:16Z
2012-01-03T04:56:16Z
2011
 
Type Journal Article
 
Identifier Journal of the Acoustical Society of America, vol.130(6); 2011; 3623-3632
no
http://drs.nio.org/drs/handle/2264/3982
 
Language en
 
Relation J_Acoust_Soc_Am_130_3623.jpg
 
Rights An edited version of this paper was published by and © 2011 Acoustical Society of America. 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 Acoustical Society of America