Near Grazing Scattering by Slightly Rough Surfaces.
NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
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At the 95th meeting of the Acoustical Society of America May 1978, I. Tolstoy outlined his application of a theory by M.A. Biot describing sound scatter from slightly rough surfaces at near-grazing incidence. This theory, using a boundary condition due to Biot Biot 1968, is first order in the roughness parameter, rather than second order as other scattering theories it includes multiple scatter and diffraction which other theories generally ignore it does not involve the Kirchhoff Assumption which is particularly suspect at small grazing angles. For near-grazing forward scatter from a point source, the theory predicts that, in addition to a volume wave, coherent multiple Rayleigh scatter will generate a boundary wave in the fluid above the slightly rough rigid surface. At sufficient distances for near-grazing incidence it is predicted that the boundary wave will be greater than the direct or volume wave. The aim of this work, in general, is to compare Tolstoys theory with experimental data. Author
- Numerical Mathematics