东海PN断面黑潮区域声传播数值模拟

NUMBERICAL SIMULATION OF ACOUSTIC TRANSMISSION IN KUROSHIO ZONE AT THE PN SECTION IN EAST CHINA SEA

利用BELLHOP声学模式模拟东海PN断面黑潮区域的声传播 ,比较夏季和冬季的接收信号。冬季的声速小于夏季的声速 ,但是信号到达时间小于夏季的到达时间 ,分析表明冬季的声速梯度小于夏季声速梯度 ,声线的海面反射次数和海底反射次数小于夏季 ,声线的路程短 ,声线路程对到达时间的影响超过声速的影响 。

Acoustic transmission in Kuroshio zone at the PN section in East China Sea is simulated with BELLHOP model. Gradient of sound speed in winter is smaller than that in summer. That results in increase in number of reflections and ray path length. Therefore, the travel times of rays are dominated by path length and rays arrive earlier in winter than in summer.