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

Thumbnail Image
Date
2002-04
Authors
Foote, Kenneth G.
Francis, David T. I.
Linked Authors
Alternative Title
Date Created
Location
DOI
10.1121/1.1458939
Replaced By
Keywords
Underwater sound
Ultrasonic scattering
Backscatter
Bioacoustics
Boundary-elements methods
Acoustic intensity measurement
Acoustic field
Seawater
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°.
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.
Embargo Date
Citation
Journal of the Acoustical Society of America 111 (2002): 1644-1654
Cruises
Cruise ID
Cruise DOI
Vessel Name