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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >A combined boundary integral and Lambert's Law method for modelling multibeam backscatter data from the seafloor
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A combined boundary integral and Lambert's Law method for modelling multibeam backscatter data from the seafloor

机译：结合边界积分和Lambert定律的方法对海底多光束反向散射数据进行建模

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摘要

A theory has been developed to model multibeam acoustic swath backscatter angular response for a two-dimensional seafloor using a combination of a boundary integral and a Lambert's Law approximation. In this theoretical approach the seafloor topography is assumed to affect scattering at two different scales: a random distribution of surface roughness (mm to cm) over small spatial distances causes scattering, while the undulating seafloor morphology at larger distances (up to 10 s of m) affects the angles of incidence of the acoustic energy with the seabed. The latter distance scales are comparable to the resolution of bathymetry acquired by commercial multibeam sonars in shelf seas, so this variation can be directly measured, leaving the small-roughness scale, not practically measureable, to be modelled by random variation. The method applies to a two-dimensional seafloor model where the bathymetry is invariant in a direction perpendicular to the multibeam swath but its physical properties (acoustic impedance, roughness amplitude and correlation length) can vary laterally across-track. We demonstrate the boundary integral technique for a range of seafloors with differing roughness. We validate our results using a time-domain finite-difference solution to the acoustic wave equation, the composite roughness model of seafloor backscattering, and comparison of observed multibeam data across contrasting fine-grained sand to course shell hash seafloor transition in Galway Bay, Ireland. (C) 2015 Elsevier Ltd. All rights reserved.
机译：已经开发出一种理论，以结合边界积分和兰伯特定律近似为二维海底建模多波束声波散射向后散射角响应。在这种理论方法中，假定海底地形会在两个不同的尺度上影响散射：在较小的空间距离上表面粗糙度（毫米至厘米）的随机分布会导致散射，而在较大距离（长达10 s m时，波浪形海底形态） ）影响声能与海床的入射角。后者的距离尺度可与商品多波束声纳在架子海中获得的测深分辨率相媲美，因此可以直接测量这种变化，而留下的小粗糙度尺度实际上是无法测量的，可以通过随机变化建模。该方法适用于二维海底模型，其中测深法在垂直于多波束测绘带的方向上是不变的，但其物理属性（声阻抗，粗糙度振幅和相关长度）可以在整个轨迹上横向变化。我们展示了具有不同粗糙度的一系列海底的边界积分技术。我们使用时域有限差分方法求解声波方程，海底反向散射的复合粗糙度模型，以及在爱尔兰戈尔韦湾对比细颗粒砂与壳层哈希海底过渡过程中观察到的多波束数据进行比较，验证了我们的结果。 （C）2015 Elsevier Ltd.保留所有权利。

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