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首页> 外文期刊>Geosciences >Multispectral Multibeam Echo Sounder Backscatter as a Tool for Improved Seafloor Characterization
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Multispectral Multibeam Echo Sounder Backscatter as a Tool for Improved Seafloor Characterization

机译：多光谱多波束回声测深仪反向散射作为改进海底特征的工具

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The establishment of multibeam echosounders (MBES), as a mainstream tool in ocean mapping, has facilitated integrative approaches towards nautical charting, benthic habitat mapping, and seafloor geotechnical surveys. The combined acoustic response of the seabed and the subsurface can vary with MBES operating frequency. At worst, this can make for difficulties in merging the results from different mapping systems or mapping campaigns. However, at best, having observations of the same seafloor at different acoustic wavelengths allows for increased discriminatory power in seabed classification and characterization efforts. Here, we present the results from trials of a multispectral multibeam system (R2Sonic 2026 MBES, manufactured by R2Sonic, LLC, Austin, TX, USA) in the Bedford Basin, Nova Scotia. In this system, the frequency can be modified on a ping-by-ping basis, which can provide multi-spectral acoustic measurements with a single pass of the survey platform. The surveys were conducted at three operating frequencies (100, 200, and 400 kHz), and the resulting backscatter mosaics revealed differences in parts of the survey area between the frequencies. Ground validation surveys using a combination of underwater video transects and benthic grab and core sampling confirmed that these differences were due to coarse, dredge spoil material underlying a surface cover of mud. These innovations offer tremendous potential for application in the area of seafloor geological and benthic habitat mapping.
机译：作为海洋制图的主流工具，多波束回波探测器（MBES）的建立促进了航海制图，底栖生境制图和海底岩土工程勘测的综合方法。海床和地下的组合声响应会随MBES工作频率而变化。在最坏的情况下，这可能会使合并来自不同制图系统或制图活动的结果变得困难。但是，充其量，在不同的声波波长下观察同一海底，可以提高海床分类和表征工作中的鉴别能力。在这里，我们介绍了在新斯科舍省贝德福德盆地进行的多光谱多光束系统（R2Sonic 2026 MBES，由R2Sonic，LLC，奥斯汀，美国，美国制造）的试验结果。在此系统中，可以在逐个ping的基础上修改频率，这可以通过勘测平台的一次通过来提供多频谱声学测量。勘测是在三个工作频率（100、200和400 kHz）下进行的，由此产生的反向散射镶嵌图揭示了勘测区域中各个频率之间的差异。结合水下视频样带，底栖抓斗和岩心取样进行的地面验证调查证实，这些差异是由于泥浆表面覆盖层下方的粗糙的挖泥土材料造成的。这些创新为海底地质和底栖生境制图领域的应用提供了巨大的潜力。

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