基于Bellhop的中尺度涡声传播特性分析
Propagation Characteristics Analysis of Mesoscale Vortex in the Sea Sound Based on Bellhop

结合某航次的温盐数据，利用经验公式，得到其在中尺度冷涡环境下沿水平方向上变化的声速剖面，结合该声速剖面及所在位置的地形特点，研究在有涡无涡环境下，涡心到涡外在不同地形时的声传播损失变化规律。研究发现，地形因素对声传播损失变化有着重要的影响，在有地形影响的中尺度涡环境下，声传播的会聚区变得比较发散，在无地形时，会聚区比较集中；在中尺度涡的影响下，会聚区会发生一定的偏移，以冷涡进行分析，中尺度冷涡会引起会聚区向涡边缘偏移，且偏移量随着接收端深度的增加而减小，且会聚带也随之变宽。
Based on the temperature and salinity data of a certain voyage, an empirical formula is used to obtain the sound velocity profile that varies horizontally in a mesoscale cold vortex environment. Combined with the terrain characteristics of the profile and its location, the variation of sound propagation loss from the vortex center to different terrains outside the vortex is studied in an environment with and without vortices. Research has found that terrain factors have an important impact on changes in sound propagation losses. In a mesoscale vortex environment with terrain effects, the convergence area of sound propagation becomes more divergent, while in the absence of terrain, the convergence area is more concentrated; Under the influence of mesoscale vortices, the convergence zone will undergo a certain displacement. Analyzing with a cold vortex, the mesoscale cold vortex will cause the convergence zone to shift toward the edge of the vortex, and the displacement will decrease with the increase of the depth of the receiving end, and the convergence zone will also widen.