摘要：Using a physical model presented by some of the authors in previous works, we
analyze the propagation of elastic waves in multiphase porous media composed
by two weakly coupled solids, saturated by a viscous single-phase fluid. The
model predicts the existence of three compressional and two shear modes of
propagation. The set of partial differential equation is solved using an
iterative domain decomposition finite element procedure in the
space-frequency domain, which allows us to include the frequency dependence
of dissipation, mass and viscous coupling coefficients in the high frequency
range. We focus the attention in the numerical simulation of ultrasonic wave
generation and propagation in a small sample of a partially frozen sandstone
(permafrost) with non-uniform waterice distribution, to analyze the
correlation between the heterogeneities, scattering and wave mode conversion
effects taking place under these conditions.
