Modelling Scattering from Simple Three-dimensional Bathymetric Features Using Wavefield Superposition

Abstract

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 seabed/water 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.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 2006
Accession Number
AD1005162

Entities

People

  • J. Fawcett

Tags

DTIC Thesaurus Topics

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  • Engineering
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  • Scattering
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  • Three Dimensional
  • Time Domain

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Oceanography.