The autonomous passive-acoustic lander Deep Sound was deployed at five locations during the Office of Naval Research (ONR)-supported Seabed Characterization Experiment, a multi-institutional field effort held at the New England Mud Patch, where the seabed is known to consist of a thick layer of silt and clay overlying a medium and coarse sand. The five deployments of Deep Sound were up to 9 h long, during which time ambient noise data, taken over an acoustic bandwidth of 5 Hz–30 kHz, were collected on four hydrophones arranged in an inverted “T” shape. Local temperature and conductivity were also recorded continuously at each location. A wave number integral model of wind-driven noise in a fluid waveguide over a two-layered elastic seabed was used to calculate the dependence of the vertical noise coherence on the geoacoustic properties in the overlying silt and clay layer, as well as the subbottom sand half-space. The modeled noise coherence was fitted to the data over the band 100 Hz–12 kHz, returning the compressional- and shear-wave speeds and densities of both layers and the thickness of the top layer.

中文翻译：

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从水体中环境噪声的垂直相干性估计新英格兰泥块的地声特性

在海军研究办公室 (ONR) 支持的海底表征实验期间，自主无源声学着陆器 Deep Sound 部署在五个地点，这是一项在新英格兰泥滩举行的多机构实地工作，已知海底包括一层厚厚的淤泥和粘土，覆盖在中等和粗沙上。Deep Sound 的五次部署长达 9 小时，在此期间，环境噪声数据在 5 Hz-30 kHz 的声学带宽上被收集在倒“T”形排列的四个水听器上。还在每个位置连续记录局部温度和电导率。使用两层弹性海床上的流体波导中风驱动噪声的波数积分模型来计算垂直噪声相干性对上覆粉砂和粘土层以及底砂中地声特性的依赖性一半的空间。模拟的噪声相干性拟合到 100 Hz–12 kHz 频带上的数据，返回两层的压缩波和剪切波速度和密度以及顶层的厚度。