Backscattering from a pressure-release rough surface

The backscattering of an incident Gaussian-tapered acoustic plane wave is modeled using finite elements, the Kirchhoff approximation, and perturbation theory, with the aim of quantifying the validity of the approximate models. von Karman-type power spectra describing the bottom roughness are sampled...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2011-04, Vol.129 (4_Supplement), p.2630-2630
Main Authors: Joshi, Sumedh M., Isakson, Marcia J.
Format: Article
Language:English
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Summary:The backscattering of an incident Gaussian-tapered acoustic plane wave is modeled using finite elements, the Kirchhoff approximation, and perturbation theory, with the aim of quantifying the validity of the approximate models. von Karman-type power spectra describing the bottom roughness are sampled from the literature with rms roughness from 3–15% of the acoustic wavelength. Realizations of each type of spectrum are made assuming a Gaussian surface height distribution, and an average backscattering cross section is obtained by ensemble averaging. The pressure-release bottom is used instead of a penetrable sediment, as the focus in this study is to quantify the differences between finite elements and the approximate models due to roughness. [Work supported by ONR.]
ISSN:0001-4966
1520-8524
DOI:10.1121/1.3588753