Computer Simulation of an Acoustic Tomography System with Application to the Kuroshio in the East China Sea Shelf Edge.

利用在日本海南部采集的CTD数据，对位于水声通道内的声源与接收机配对的海洋声层析成像系统进行了数值模拟。对不同声场进行了两种模拟。在第一个模拟中，为简单起见，没有考虑声场的水平变化。声源和接收机位于纵深420m的声道轴线上，间隔100km。利用接收到的24条声射线的到达时间作为数据，重建了声射线交叉区域的声速初始剖面。当分割的水平层数小于处理后的射线数时，初始剖面与重建剖面的一致性较好。在第二次模拟中，研究了声场随水平变化的情况。在此条件下，在深度411m、间隔145km的声源与接收机之间传播的射线数减少到8条。虽然处理的射线数量有限，但通过仔细选择良好的到达时间数据，成功地重建了初始剖面。

The numerical simulation of the ocean acoustic tomography system composed of a paired sound source and receiver located in the underwater sound channel has been carried out using the CTD data collected in the southern Japan Sea. Two kinds of simulations for the different sound fields were done.In the first simulation, the horizontal variation of the sound field was not considered for simplicity. A sound source and receiver were located at the axis of the sound channel of depth 420m with interval 100km. The arrival times for 24 sound rays received were used as data to reconstruct the initial profile of sound speed in the region where the rays crossed over. Agreement between the initial and reconstructed profiles was excellent when the number of the divided horizontal layers was smaller than that of the processed rays.In the second simulation, the sound field with horizontal variation was investigated. Under such a condition, the number of rays propagating between a sound source and receiver located at depth 411m with interval 145km reduced to 8. Although the number of the processed rays had a limitation, the initial profile was successfully reconstructed through a careful selection of good arrival time data.