Modeling scattering from azimuthally symmetric bathymetric features using wavefield superposition.

Modeling scattering from azimuthally symmetric bathymetric features using wavefield superposition. Research Abstract Details 

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Modeling scattering from azimuthally symmetric bathymetric features using wavefield superposition. Abstract Text:

John A Fawcett,John A Fawcett,

In this paper, an approach for modeling the scattering from azimuthally symmetric bathymetric features is described. These features are useful models for small mounds and indentations on the seafloor at high frequencies and seamounts, shoals, and basins at low frequencies. A bathymetric feature can be considered as a compact closed region, with the same sound speed and density as one of the surrounding media. Using this approach, a number of numerical methods appropriate for a partially buried target or facet problem can be applied. This paper considers the use of wavefield superposition and because of the azimuthal symmetry, the three-dimensional solution to the scattering problem can be expressed as a Fourier sum of solutions to a set of two-dimensional scattering problems. In the case where the surrounding two half spaces have only a density contrast, a semianalytic coupled mode solution is derived. This provides a benchmark solution to scattering from a class of penetrable hemispherical bosses or indentations. The details and problems of the numerical implementation of the wavefield superposition method are described. Example computations using the method for a simple scattering feature on a seabed are presented for a wide band of frequencies.

Modeling scattering from azimuthally symmetric bathymetric features using wavefield superposition. Publishing Authors By Initials

JA Fawcett,JA Fawcett,

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Modeling scattering from azimuthally symmetric bathymetric features using wavefield superposition. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The Journal of the Acoustical Society of America

VOLUME: 122

Page Numbers: 3286-95

Journal Abbreviation: J. Acoust. Soc. Am.

ISSN: 1520-8524

DAY: 5

MONTH: Dec

YEAR: 2007

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LANGUAGE: eng

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AFFILIATION: DRDC - Atlantic, PO Box 1012, Dartmouth, NS, Canada B2Y 3Z7.

Country: United States

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