PLANE WAVE AT THE INTERFACE BETWEEN WATER AND A GASSY POROELASTIC LAYER WITH UNDERLYING ELASTIC SEABED

Abstract eng:
Based on the multiphase poroelasticity theory, the reflection characteristics of an obliquely incident plane wave upon a plane interface between overlying water and a gassy marine sediment layer with underlying elastic solid seabed are investigated. The sandwiched gassy layer is modeled as a porous material with finite thickness, which is saturated by two compressible and viscous fluids (liquid and gas). The closed-form expression for the amplitude ratio of the reflected wave, i.e., reflection coefficient, is derived according to the boundary conditions at the upper and lower interfaces in the proposed model. Using numerical calculation, the influences of incident angle, wave frequency, layer thickness and liquid saturation of sandwiched porous layer on the reflection coefficient are analyzed, respectively. It is revealed that the reflection coefficient is closely associated with incident angle and sandwiched layer thickness. Moreover, in different frequency ranges, the dependence of the wave reflection characteristics on moisture (or gas) variations in the intermediate marine sediment layer is distinguishing.

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