The paper uses the Boundary Element Method (BEM) to compute the response of rigid inclusions subjected to spatially sinusoidal harmonic line pressure loads when these inclusions are submerged in a channel bounded by a sediment layer, which is over a rigid boundary. The formulation uses 2.5D Green's functions for the steady state response of the layered media (fluid and solid sediment), defined in the frequency domain. The use of these Green's functions in the BEM formulation eliminates the need to discretize the free horizontal interfaces, and this contributes to the efficiency of the BEM model. Time responses have been computed for different scenarios, allowing the identification of features that can be used to detect the presence and location of inclusions submerged in a fluid channel. The synthetic results are compared with those given when the fluid channel is on a rigid seabed, in order to evaluate the importance of the mechanical properties of the channel floor on the final pressure field.
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