Modelling Scattering from Simple Three-dimensional Bathymetric Features Using Wavefield Superposition
Defence R and D Canada - Atlantic Dartmouth, NS Canada
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In this report a method for modelling the scattering from three-dimensional bathymetric features on the seabed is described. In particular, the features are taken to be azimuthally-symmetric about the z-axis. This approach could model seamount or basin type features or at higher frequencies, smaller protuberances and depressions. The method uses aset of point sources within the scattering region and exterior to the region to satisfy the appropriate continuity and boundary conditions along scattering features and seabedwater interface. Multi-frequency and Fourier-synthesized time domain responses for the scattering from such features are presented. In addition we present a semi-analytic modal solution which can be used as a benchmark for a bathymetric feature in a halfspace with only a change in density.