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Accuracy of the Kirchhoff-Approximation and Kirchhoff-Ray-Mode Fish Swimbladder Acoustic Scattering Models

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  • Gavin J Macaulay
  • Héctor Peña
  • Sascha M M Fässler
  • Geir Pedersen
  • Egil Ona

Abstract

The acoustic backscatter from pressure release prolate spheroids and a three-dimensional representation of a fish swimbladder (Chilean jack mackerel, Trachurus symmetricus murphyi) was calculated using four target strength models (Kirchhoff-approximation, Kirchhoff-ray-mode, finite element solution of the Helmholtz equation, and prolate-spheroid-modal-series). Smoothly varying errors were found in the Kirchhoff-approximation and Kirchhoff-ray-mode model results when compared to the other models, and provide objective criteria for constraining the use of the KA and KRM models. A generic correction technique is also proposed for the prolate spheroid estimates and tentatively tested on a jack mackerel swimbladder, resulting in improvements to the target strength estimates from the Kirchhoff-approximation and Kirchhoff-ray-mode models.

Suggested Citation

  • Gavin J Macaulay & Héctor Peña & Sascha M M Fässler & Geir Pedersen & Egil Ona, 2013. "Accuracy of the Kirchhoff-Approximation and Kirchhoff-Ray-Mode Fish Swimbladder Acoustic Scattering Models," PLOS ONE, Public Library of Science, vol. 8(5), pages 1-7, May.
    • Handle: RePEc:plo:pone00:0064055
    DOI: 10.1371/journal.pone.0064055
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