An assessment of the effective density fluid model for scattering from poroelastic sediments with inclusions

Abstract

The effective density fluid model (EDFM) was developed to approximate the behavior of sediments governed by Biot’s theory of poroelasticity. Previously, it has been shown that the EDFM predicts reflection coefficients and backscattering strengths that are in close agreement with those of the full Biot model for the case of a homogeneous poroelastic half-space. However, it has not yet been determined to what extent the EDFM can be used in place of the full Biot model for other cases. In this work, the finite element method is used to compare the scattered pressure predicted using the EDFM with the predictions of the full Biot model for the case of a poroelastic half-space with a single inclusion. The geometry is assumed axisymmetric and the inclusions are allowed to be either a fluid or an elastic solid. [Work supported by ONR, Ocean Acoustics.]