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Comparing Kirchhoff-approximation and boundary-element models for computing gadoid target strengths

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dc.contributor.author Foote, Kenneth G.
dc.contributor.author Francis, David T. I.
dc.date.accessioned 2008-10-09T14:40:57Z
dc.date.available 2008-10-09T14:40:57Z
dc.date.issued 2002-04
dc.identifier.citation Journal of the Acoustical Society of America 111 (2002): 1644-1654 en
dc.identifier.uri http://hdl.handle.net/1912/2475
dc.description Author Posting. © Acoustical Society of America , 2008. 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 111 (2002): 1644-1654, doi:10.1121/1.1458939. en
dc.description.abstract To establish the validity of the boundary-element method (BEM) for modeling scattering by swimbladder-bearing fish, the BEM is exercised in several ways. In a computation of backscattering by a 50-mm-diam spherical void in sea water at the four frequencies 38.1, 49.6, 68.4, and 120.4 kHz, agreement with the analytical solution is excellent. In computations of target strength as a function of tilt angle for each of 15 surface-adapted gadoids for which the swimbladders were earlier mapped, BEM results are in close agreement with Kirchhoff-approximation-model results at each of the same four frequencies. When averaged with respect to various tilt angle distributions and combined by regression analysis, the two models yield similar results. Comparisons with corresponding values derived from measured target strength functions of the same 15 gadoid specimens are fair, especially for the tilt angle distribution with the greatest standard deviation, namely 16°. en
dc.description.sponsorship This work began with sponsorship by the European Commission through its RTD-program, Contract No. MAS3-CT95-0031 (BASS). 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/10.1121/1.1458939
dc.subject Underwater sound en
dc.subject Ultrasonic scattering en
dc.subject Backscatter en
dc.subject Bioacoustics en
dc.subject Boundary-elements methods en
dc.subject Acoustic intensity measurement en
dc.subject Acoustic field en
dc.subject Seawater en
dc.title Comparing Kirchhoff-approximation and boundary-element models for computing gadoid target strengths en
dc.type Article en
dc.identifier.doi 10.1121/1.1458939


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