Estimation of sea surface and bottom scattering strengths from measured and modeled reverberation levels

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A measurement of low-frequency reverberation was conducted in order to investigate features of sea surface and bottom scatterings in shallow water, where it is generally difficult to acquire sea surface and bottom reverberations separately. In the measurement, a vertical line array receiver is used so that reverberations scattered from the sea surface and bottom over a wide range of grazing angles are captured with multibeams covering a vertical plane. The parameters of the sea surface and bottom scattering functions are estimated by applying the stochastic inversion method to solve the forward problem involving the measured reverberation and its modeling result calculated using the sea surface and bottom scattering functions. The estimated parameters produce a modeling result that is in good agreement with the measured reverberation for each beam, and describe sea surface and bottom scattering strengths as functions of grazing angle via the scattering functions.

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