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Scattering from a Finite Cylinder near an Interface

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Technical Report

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DRDC - Atlantic Research Centre Dartmouth, Nova Scotia Canada

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In this paper a Boundary Integral Equation Method BIEM is described for the computation of scattering from a finite, rigid, cylinder near a pressure release interface. The cylinder lies parallel or tilted with respect to the interface plane so that the azimuthal symmetry of the problem is destroyed. The scattering solution is first described in terms of an azimuthally-symmetric free space solution. The multiple interactions of the scattered field with the interface are accounted for by an azimuthal-conversion matrix. In the numerical examples,the method of this paper is benchmarked using wavefield superposition for asphere near a pressure-release surface. Computed scattered spectra are shown for a finite cylinder, parallel and tilted with respect to the interface, and for a variety of sourcereceiver geometries. The differences resulting from not including multiple targetinterface interactions single scatter solution and from including all interactions are presented. The problem of irregular frequencies for the single-scatter and the fully coupled BIEM are discussed and numerically examined.

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