Modeling seafloor geoacoustic interaction with a numerical scattering chamber


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dc.contributor.author Stephen, Ralph A.
dc.contributor.author Swift, Stephen A.
dc.date.accessioned 2008-10-14T18:21:21Z
dc.date.available 2008-10-14T18:21:21Z
dc.date.issued 1994-08
dc.identifier.citation Journal of the Acoustical Society of America 96 (1994): 973-990 en
dc.identifier.uri http://hdl.handle.net/1912/2494
dc.description Author Posting. © Acoustical Society of America, 1994. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 96 (1994): 973-990, doi:10.1121/1.410271. en
dc.description.abstract A numerical scattering chamber (NSC) has been developed to compute backscatter functions for geologically realistic seafloor models. In the NSC, solutions are computed to the elastic (or anelastic) wave equation by the finite-difference method. This has the following advantages: (a) It includes all rigidity effects in the bottom including body and interface waves. (b) It can be applied to pulse beams at low grazing angles. (c) Both forward scatter and backscatter are included. (d) Multiple interactions between scatterers are included. (e) Arbitrary, range-dependent topography and volume heterogeneity can be treated simultaneously. (f) Problems are scaled to wavelengths and periods so that the results are applicable to a wide range of frequencies. (g) The method considers scattering from structures with length scales on the order of acoustic wavelengths. The process is discussed for two examples: a single facet on a flat, homogeneous seafloor and a canonically rough, homogeneous seafloor. Representing the backscattered field by a single, angle-dependent coefficient is an oversimplification. In a strong scattering environment, time spread of the field is a significant issue and an angle-dependent separation of the wave field may not be valid. en
dc.description.sponsorship This work was carried out under support from the Office of Naval Research Acoustic Reverberation Special Research (Grant Number N00014-90-J-1493 en
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Acoustical Society of America en
dc.relation.uri http://dx.doi.org/10.1121/1.410271
dc.subject Sea bed en
dc.subject Sound waves en
dc.subject Backscattering en
dc.subject Finite difference method en
dc.subject Roughness en
dc.subject Wave equations en
dc.title Modeling seafloor geoacoustic interaction with a numerical scattering chamber en
dc.type Article en
dc.identifier.doi 10.1121/1.410271

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