声波在过渡区楔形海域的传播特性研究

声波在海洋中传播的特性,历来都是水声学一个极其重要的问题,本文通过模拟一个典型的楔形海底地形,用三维射线模型计算了声波在该海域传播的方向特性,计算结果指出,在海底倾角较大的海区,声线具有明显的水平折射,这种水平折射的效应,用于声源定位时必须予以修正。本文提出了一种简便易行的修正水平折射的方法。该结论对于水下目标定位具有重要的指导意义。

A research on characteristic of sound propagation in complicated bottom ocean

Almost all of the sound rays will touch the bottom in shallow sea. So it is very important to research the characteristic of sea bed, especially its absorption and its contour reflection. A ray trace theory was discussed and applied to calculate sound trace and its loss. The best advantage of this method is its clear ray physical photo and its short calculating time.The result revealed, in shallow sea, the bottom mountains will remarkably influence sound transmission and made its intensity lower than flat bottom. At the same time, above the rest of the mountain, an additional convergence zone will be formed.