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首页> 外文期刊>Estuarine Coastal and Shelf Science >Acoustic habitat and shellfish mapping and monitoring in shallow coastal water - Sidescan sonar experiences in The Netherlands
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Acoustic habitat and shellfish mapping and monitoring in shallow coastal water - Sidescan sonar experiences in The Netherlands

机译：沿海浅水区的声栖息地和贝类制图和监测-荷兰的Sidescan声纳经验

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摘要

Sidescan sonar has been applied in a number of shallow water environments along the Dutch coast to map and monitor shellfish and seabed habitats. The littoral setting of these surveys may hamper data acquisition flying the towfish in zones of turbulence and waves, but also offers valuable opportunities for understanding, interpreting and validating sidescan sonar images because of the ability to ground-truth during low water periods, enabling easy identification and validation. Acoustical images of some of the mussel banks on the tidal flats of the Wadden Sea, recorded at high tide, show a marked resemblance with optical Google Earth images of the same banks. These sonar images may thus serve as 'acoustic type signatures' for the interpretation of sonar patterns recorded in deeper water where ground-truthing is more difficult and more expensive. Similarly, acoustic type signatures of (Japanese) oyster banks were obtained in the estuaries in the southwest of the Netherlands.rnAutomated acoustic pattern recognition of different habitats and acoustical estimation of faunal cover and density are possible applications of sidescan sonar. Both require that the backscattering observed on the sidescan sonar images is directly caused by the biological component of the seafloor. Filtering offers a simple and effective pre-processing technique to separate the faunal signals from linear trends such as emanating from wave ripples or the central tracks of the towfish. Acoustically estimating the faunal density is approached by in-situ counting peaks in backscattering in unit squares. These counts must be calibrated by ground-truthing. Ground-truthing on littoral mussel banks in the Wadden Sea has been carried out by measuring their cover along lines during low tide. Due to its capacity of yielding full-cover, high resolution images of large surfaces, sidescan sonar proves to be an excellent, cost-effective tool for quantitative time-lapse monitoring of habitats.
机译：Sidescan声纳已被用于荷兰沿岸的许多浅水环境中，以绘制地图并监视贝类和海底栖息地。这些调查的沿岸设置可能会妨碍在湍流和海浪区域中拖曳鱼的数据采集，但由于在低水位时具有地面真相的能力，还为理解，解释和验证侧扫声纳图像提供了宝贵的机会，从而易于识别和验证。瓦登海潮滩上一些贻贝河岸的声学图像在涨潮时记录，与这些河谷的光学Google Earth图像非常相似。这些声纳图像因此可以用作“声波类型签名”，以解释记录在更深，更昂贵的更深水中的声纳模式。同样，在荷兰西南部的河口获得了（日本）牡蛎岸的声学类型特征。不同生境的自动声学模式识别以及动物覆盖度和密度的声学估计可能是侧扫声纳的应用。两者都要求在侧面扫描声纳图像上观察到的反向散射直接由海底的生物成分引起。滤波提供了一种简单有效的预处理技术，可以将动物信号与线性趋势（例如，波浪波纹或拖鱼的中央轨迹发出的信号）分开。通过原位计算单位平方中反向散射的峰值，可以直观地估算出动物的密度。这些计数必须通过地面校正来校准。瓦登海沿岸贻贝河岸的地面真潮是通过在退潮时沿线测量其覆盖范围来进行的。由于能够产生大面积的完整覆盖的高分辨率图像，因此侧面扫描声纳被证明是用于定量监测栖息地的极佳且具有成本效益的工具。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2009年第3期|436-447|共12页
  • 作者

    Ronnie van Overmeeren; Johan Craeymeersch; Jan van Dalfsen; Frouke Fey; Sytze van Heteren; Erik Meesters;

  • 作者单位

    Deltares, PO Box 85467, 3508 AL Utrecht, The Netherlands TNO Geological Survey of the Netherlands, PO Box 80015, 3508 TA Utrecht, The Netherlands;

    Institute for Marine Resources & Ecosystem Studies (MARES), PO Box 77, 4400 AB Yerseke, The Netherlands;

    Institute for Marine Resources & Ecosystem Studies (IMARES), PO Box 57,1780 AB Den Helder, The Netherlands;

    Institute for Marine Resources & Ecosystem Studies (IMARES), PO Box 167, 1790 AD Den Burg, Texel, The Netherlands;

    Deltares, PO Box 85467, 3508 AL Utrecht, The Netherlands TNO Geological Survey of the Netherlands, PO Box 80015, 3508 TA Utrecht, The Netherlands;

    Institute for Marine Resources & Ecosystem Studies (IMARES), PO Box 167, 1790 AD Den Burg, Texel, The Netherlands;

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  • 正文语种 eng
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  • 关键词

    sidescan sonar; acoustic imaging; acoustic monitoring; seabed habitats; shellfish; (sub)littoral zone;

    机译：侧扫声纳声学成像声音监控;海底栖息地;贝类;（副）滨海带;

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