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Geoacoustic inversion with two source-receiver arrays in shallow water

Abstract : A geoacoustic inversion scheme based on a double beamforming algorithm in shallow water is proposed and tested. Double beamforming allows identification of multi-reverberated eigenrays propagating between two vertical transducer arrays according to their emission and reception angles and arrival times. Analysis of eigenray intensities yields the bottom reflection coefficient as a function of angle of incidence. By fitting the experimental reflection coefficient with a theoretical prediction, values of the acoustic parameters of the waveguide bottom can be extracted. The procedure was initially tested in a small-scale tank experiment for a waveguide with a Plexiglas bottom. Inversion results for the speed of shear waves in Plexiglas are in good agreement with the table values. A similar analysis was applied to data collected during an at-sea experiment in shallow coastal waters of the Mediterranean. Bottom reflection coefficient was fitted with the theory in which bottom sediments are modeled as a multi-layered system. Retrieved bottom parameters are in quantitative agreement with those determined from a prior inversion scheme performed in the same area. The present study confirms the interest in processing source-receiver array data through the double beamforming algorithm, and indicates the potential for application of eigenray intensity analysis to geoacoustic inversion problems.
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Submitted on : Saturday, February 12, 2011 - 12:19:06 AM
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Alexey Sukhovich, Philippe Roux, Marc Wathelet. Geoacoustic inversion with two source-receiver arrays in shallow water. Journal of the Acoustical Society of America, Acoustical Society of America, 2010, 128 (2), pp.702-710. ⟨10.1121/1.3455822⟩. ⟨insu-00565375⟩



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