其他摘要：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.
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