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

利用日本南部海域的CTD资料，对位于水下声道中的声源和接收器组成的海洋声层析成像系统进行了数值模拟。针对不同的声场进行了两种不同的模拟，第一种模拟没有考虑声场的水平变化。声源和接收器位于声道轴线上，声道深度420m，间隔100公里。接收到的24条声线的到达时间被用作数据，以重建射线交叉区域的初始声速轮廓。当划分的水平层数少于处理后的射线层数时，初始剖面与重建剖面的一致性很好。在第二个模拟中，研究了声场随水平变化的情况。在这种情况下，在深度为411m、间隔145公里的声源和接收器之间传播的射线数减少到8条。尽管处理的射线数有限制，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.