The reflection of plane acoustic waves at the water–sediment interface is analyzed. The sediments are modeled using Biot’s equations with depth-dependent coefficients. Computations are made of the reflection coefficient as a function of the incident wave frequency and angle for representative sediment properties. The results are compared to those obtained by modeling the sediments as a homogeneous viscoelastic material and as a viscoelastic material with depth-dependent properties. It is shown that both of these models yield predictions of the reflection coefficient that can differ substantially from the Biot model.
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Stern et al. (1985) studied this question.