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首页> 外文期刊>Estuarine Coastal and Shelf Science >Innovative method for optimizing Side-Scan Sonar mapping: The blind band unveiled
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Innovative method for optimizing Side-Scan Sonar mapping: The blind band unveiled

机译：优化侧面扫描声纳映射的创新方法：盲区揭晓

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摘要

Over the past few years, the mapping of Mediterranean marine habitats has become a priority for scientists, environment managers and stakeholders, in particular in order to comply with European directives (Water Framework Directive and Marine Strategy Framework Directive) and to implement legislation to ensure their conservation. Side-scan sonar (SSS) is recognised as one of the most effective tool for underwater mapping. However, interpretation of acoustic data (sonograms) requires extensive field calibration and the ground-truthing process remains essential. Several techniques are commonly used, with sampling methods involving grabs, scuba diving observations or Remotely Operated Vehicle (ROV) underwater video recordings. All these techniques are time consuming, expensive and only provide sporadic informations. In the present study, the possibility of coupling a camera with a SSS and acquiring underwater videos in a continuous way has been tested. During the 'PosidCorse' oceanographic survey carried out along the eastern coast of Corsica, optical and acoustic data were respectively obtained using a GoProTM camera and a Klein 3000TM SSS. Thereby, five profiles were performed between 10 and 50 m depth, corresponding to more than 20 km of data acquisition. The vertical images recorded with the camera fixed under the SSS and positioned facing downwards provided photo mosaics of very good quality corresponding to the entire sonograms's blind band. From the photo mosaics, 94% of the different bottom types and main habitats have been identified; specific structures linked to hydrodynamics conditions, anthropic and biological activities have also been observed as well as the substrate on which the Posidonia oceanica meadow grows. The association between acoustic data and underwater videos has proved to be a non-destructive and cost-effective method for ground-truthing in marine habitats mapping. Nevertheless, in order to optimize the results over the next surveys, certain limitations will need to be remedied. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在过去的几年中，对地中海海洋栖息地进行测绘已成为科学家，环境管理者和利益相关者的优先考虑事项，尤其是为了遵守欧洲指令（水框架指令和海洋战略框架指令）并实施法规以确保保护。侧面扫描声纳（SSS）被认为是用于水下测绘的最有效工具之一。但是，对声波数据（声波图）的解释需要进行广泛的现场校准，而地面修真过程仍然至关重要。通常使用几种技术，采样方法包括抓斗，水肺潜水观察或遥控车辆（ROV）水下录像。所有这些技术都是耗时，昂贵的并且仅提供零星的信息。在本研究中，已经测试了将相机与SSS耦合并以连续方式获取水下视频的可能性。在科西嘉岛东海岸进行的“ PosidCorse”海洋学调查中，分别使用GoProTM摄像机和Klein 3000TM SSS获得了光学和声学数据。因此，在10至50 m的深度之间执行了五个剖面，对应于超过20 km的数据采集。将相机固定在SSS下并面向下放置时记录的垂直图像提供了与整个超声图的盲带相对应的非常高质量的照片马赛克。从照片马赛克中，已经识别出94％的不同底部类型和主要栖息地；还观察到了与流体力学条件，人类活动和生物活动有关的特定结构以及海洋波塞冬草草甸生长的基质。事实证明，声学数据与水下视频之间的关联是一种在海洋生境图中绘制地面真相的无损且经济高效的方法。然而，为了在下一次调查中优化结果，将需要纠正某些限制。 （C）2017 Elsevier Ltd.保留所有权利。

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