2.5D scattering of waves by rigid inclusions buried under a fluid channel via BEM

A 2.5D Boundary Element Method (BEM) formulation, applied in the frequency domain, is developed to compute the scattering of waves by rigid inclusions buried in a semi-infinite solid under a fluid layer, when this system is excited by a spatially-sinusoidal harmonic load. M algorithm includes Greenʹs functions for a horizontal fluid layer over a semi-infinite solid, which avoids the discretrization of the horizontal surfaces, and thus only the rigid inclusion needs to be discretized by boundary elements. The model uses complex frequencies with a small imaginary part to avoid aliasing phenomena. Time domain responses are obtained by applying an inverse Fourier Transform to the frequency results. The source is modeled as a Ricker pulse. The simulations are performed for three different properties of the solid medium: a fast formation, a slow formation and a sediment formation.