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
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Creator |
Haris, K.
Chakraborty, B. De, C. Desai, R.G.P. Fernandes, W.A. |
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Subject |
seafloor mapping
sediment characteristics backscatter multibeam sonar |
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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.
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Date |
2012-01-03T04:56:16Z
2012-01-03T04:56:16Z 2011 |
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Type |
Journal Article
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Identifier |
Journal of the Acoustical Society of America, vol.130(6); 2011; 3623-3632
no http://drs.nio.org/drs/handle/2264/3982 |
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Language |
en
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Relation |
J_Acoust_Soc_Am_130_3623.jpg
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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.
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Publisher |
Acoustical Society of America
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