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首页> 外文期刊>ICES Journal of Marine Science >Modelling the effect of swimbladder compression on the acoustic backscattering from herring at normal or near-normal dorsal incidences
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Modelling the effect of swimbladder compression on the acoustic backscattering from herring at normal or near-normal dorsal incidences

机译：模拟正常或接近正常背侧入射时泳囊压缩对鲱鱼声向后向散射的影响

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摘要

Inaccuracy in herring target strength can be an important source of bias in the acoustic assessment of several important herring stocks. New acoustic data on herring target strength (Ona et al, 2001, submitted for publication; Ona, 2003) confirm previous suggestions and evidence on a possible reduction of the size of the herring swimbladder as a result of its compression with increasing water depth. Theoretical work for a better understanding of the acoustic scattering from herring over its entire depth distribution may therefore be essential for improving abundance estimation. This study supplements the analysis, conducted by Gorska and Ona (2003) for herring averaged-backscattering cross-section. The modal-based, deformed-cylinder model (MB-DCM) solutions, presented in that paper, are used. The sensitivity of the herring backscattering cross-section in case of normal or near-normal dorsal incidences is studied with respect to frequency, contraction factors of the swimbladder dimensions and some fish morphological parameters. The study is important for a better understanding of not only the backscattering by individual fish for the dorsal incidence, but also the depth- and frequency-dependencies of the mean-backscattering cross-section. The theoretical results have been applied in the interpretation of the actual measured target-strength data on adult herring.
机译：鲱鱼目标强度的不准确可能是对几种重要鲱鱼种群进行声学评估时产生偏差的重要原因。关于鲱鱼目标强度的新的声学数据（Ona等人，2001；提交出版； Ona，2003）证实了先前的建议和证据，表明随着水深的增加，鲱鱼游泳囊的压缩可能会减小其大小。因此，为更好地理解鲱鱼在其整个深度分布上的声散射而进行的理论工作对于改善丰度估计可能至关重要。这项研究补充了Gorska和Ona（2003）对鲱鱼平均后向散射截面的分析。使用了该论文中介绍的基于模态的变形圆柱模型（MB-DCM）解决方案。研究了正常或接近正常背侧入射情况下鲱鱼背散射横截面的敏感性，涉及频率，游泳囊尺寸的收缩因子和一些鱼类形态学参数。该研究对于更好地理解单个鱼的背向散射不仅对背侧发生率有重要意义，而且对平均背向散射截面的深度和频率依赖性也有更好的了解。理论结果已用于解释成人鲱鱼的实际测得目标强度数据。

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