中低频（<10kHz）局部地声参数反演方法研究及在南黄海海域多种底质类型区域的应用

海底地声参数作为描述海底底质特性的重要内容，已逐渐成为海底声学探测领域的研究重点，目前地声反演是获取海底地声参数的有效手段。众所周知，不同海底底质类型的地声参数之间存在明显区别。为实现不同底质类型地声参数的精确获取，本项目首先基于波数积分法实现近场不同掠射角海底反射损失的计算方法研究，然后利用宽掠射角海底反射损失曲线实现局部海底地声参数反演。同时，基于宽频声源和垂直线阵开展南黄海海域多种底质类型区域中低频（<10kHz）宽掠射角声学数据采集方法研究并实现实际数据的局部地声参数反演。最终基于反演结果总结地声参数随底质类型和频率的变化规律。通过本项目的研究以期形成一套适用于我国近海海域的中低频局部地声反演方法，其在底质类型评价等方面具有显著的潜在应用价值。

As an important part of describing the characteristics of the seabed sediments, the geoacoustic parameters have gradually become the research emphases in the field of seabed acoustic exploration. At present, the geoacoustic inversion is an effective method for obtaining seabed geoacoustic parameters. As is known to all, there are significant differences in the geoacoustic parameters of different sediment types. In order to accurately obtain the geoacoustic parameters from different sediment types, this project first realizes the calculation method of seabed reflection loss at different grazing angles in the near field based on the wavenumber integration method, and then uses the wide grazing angle seabed reflection loss curve to achieve the inversion of local seabed sediment geoacoustic parameters. At the same time, it carries out research on the acquisition method of low-to-mid frequencies (<10kHz) acoustic data based on broadband acoustic sources and vertical linear arrays, and achieves the inversion of local geoacoustic parameters in various sediment type regions of the South Yellow Sea. Finally, according to the inversion results, the project summarizes the changing laws of geoacoustic parameters with frequencies and the sediment types. It is hoped that through the research of this project, a set of local geoacoustic inversion methods in the middle and low frequency bands suitable for the offshore area of China will be formed, which has significant potential application value in fields such as evaluation of sediment types.