%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Sukhovich, A.
%A Roux, P.
%A Wathelet, Marc
%T Geoacoustic inversion with two source-receiver arrays in shallow water
%D 2010
%L fdi:010089877
%G ENG
%J Journal of the Acoustical Society of America
%@ 0001-4966
%M ISI:000280769800024
%N 2
%P 702-710
%R 10.1121/1.3455822
%U https://www.documentation.ird.fr/hor/fdi:010089877
%> https://www.documentation.ird.fr/intranet/publi/2024-04/010089877.pdf
%V 128
%W Horizon (IRD)
%X 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.
%$ 066