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首页> 外文期刊>ICES Journal of Marine Science >Modelling the acoustic effect of swimbladder compression in herring
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Modelling the acoustic effect of swimbladder compression in herring

机译：模拟鲱鱼中游泳囊压缩的声学效果

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摘要

Obtaining accurate data on fish target strength (TS) is important when determining the quality of the results from acoustic surveys. However, this requires an improved understanding of both behavioural and environmental influences on the acoustic backscattering by fish. It is well known that the increased pressure with depth compresses the swimbladder of herring, and it has been confirmed by in situ measurements that the TS of adult herring (30-34 cm) is 3-5 dB weaker at 300 m than that of fish close to the surface. Understanding exactly how swimbladder compression may influence herring TS is, therefore, of great interest, and is the main motivation behind this study. Taking account of swimbladder volume changes with depth, we obtained analytical solutions using the Modal-Based, Deformed-Cylinder Model (MB-DCM). The mean-backscattering cross-section is then computed with selected orientation patterns, length distributions, and contrast parameters. The depth-dependence of TS at different acoustic frequencies has been studied. We conducted a sensitivity analysis to show how TS is dependent on the contraction rates of the bladder dimensions and on the fish-orientation distribution. Our theoretical results are compared with TS measured at 38 kHz.
机译：确定声学调查结果的质量时，获得有关鱼类目标强度（TS）的准确数据非常重要。但是，这需要对行为和环境对鱼类声反向散射的影响有更好的了解。众所周知，随着深度的增加压力会压缩鲱鱼的泳囊，并且通过原位测量证实，成年鲱鱼（30-34 cm）的TS在300 m处比鱼弱3-5 dB靠近表面。因此，准确了解游泳囊的压迫如何可能会影响鲱鱼的TS成为人们的极大兴趣，并且是这项研究的主要动机。考虑到游泳囊体积随深度的变化，我们使用基于模态的变形圆柱模型（MB-DCM）获得了分析解决方案。然后使用选定的方向图，长度分布和对比度参数计算平均后向散射截面。已经研究了不同声频下TS的深度依赖性。我们进行了敏感性分析，以显示TS如何取决于膀胱尺寸的收缩率和鱼向分布。我们的理论结果与38 kHz处的TS进行了比较。

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