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首页> 外文期刊>ICES Journal of Marine Science >Modelling three-dimensional directivity of sound scattering by Antarctic krill: progress towards biomass estimation using multibeam sonar
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Modelling three-dimensional directivity of sound scattering by Antarctic krill: progress towards biomass estimation using multibeam sonar

机译：用南极磷虾模拟声音散射的三维方向性：使用多束声纳估算生物量的进展

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摘要

Target strength (TS) estimation is a principal source of uncertainty in acoustic surveys of Antarctic krill (Euphausia superba). Although TS is strongly dependent on krill orientation, there is a paucity of information in this regard. This paper considers the potential for narrow-bandwidth, multibeam-echosounder (MBE) data to be used for estimating the orientations of krill beneath survey vessels. First, software was developed to predict MBE measurements of the directivity patterns of acoustic scattering from individual or aggregated krill in any orientation. Based on the distorted-wave, Bom approximation model (DWBA), scattering intensities are predicted vs. MBE angles for specified distributions of krill orientations (pitch, roll, and yaw angles) and swarm densities. Results indicate that certain distributions of orientations, perhaps indicative of particular behaviour, should be apparent from the sonar data. The model results are compared with measurements on krill made using a 200-kHz MBE deployed from a small craft off Cape Shirreff, Livingston Island, Antarctica, in summer 2006. The stochastic DWBA model is then invoked to explain disparities between the model predictions and MBE measurements.
机译：目标强度（TS）估计是南极磷虾（Euphausia superba）声学调查中不确定性的主要来源。尽管TS很大程度上取决于磷虾的方位，但是在这方面信息很少。本文考虑了窄带宽多波束回声测深仪（MBE）数据用于估计调查船下方磷虾方位的潜力。首先，开发了软件来预测来自任何方向的单个或聚集磷虾的声散射方向图的MBE测量。基于扭曲波，Bom近似模型（DWBA），针对磷虾方向（俯仰角，横滚角和偏航角）的特定分布和群密度，预测了散射强度与MBE角的关系。结果表明，从声纳数据中可以明显看出某些定向分布，可能表明特定的行为。将模型结果与使用200 kHz MBE进行的磷虾测量结果进行比较，该磷虾是在2006年夏季从南极洲利文斯顿岛的Shirreff角附近的小型飞船上部署的。测量。

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