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2014年在中国南海进行了一次深海海底山环境的声传播实验.本文利用宽带爆炸声信号分析了海底山对声传播的影响.在第一会聚区位置,由于海底山的阻挡,海底山环境下传播损失(TL)增加了30 dB以上.此外,实验观察到在第一影区的位置,由于海底山的反射,海底山环境下的传播损失比无海底山环境下的传播损失减小近7 dB.在28 km附近,海底山环境下的传播损失随着接收深度的增大而增大,接收深度170与1868 m处的传播损失相差近10 dB.在距离大于30 km时,不同接收深度条件下的声传播损失随距离的变化趋势基本一致,且大部分距离处的差异小于3 dB.实验得到的传播损失和脉冲达到结构与理论计算结果符合得很好,并利用射线和波动理论解释了由于海山引起的传播损失异常现象和脉冲到达结构.
An acoustic propagation experiment was carried out in the South China Sea of China in 2014. In this paper, the influence of the sea-bottom mountain on acoustic propagation was analyzed by using the broadband explosion acoustic signal.At the first gathering area, due to the blockage of the sea-mount and the sea-mount environment The propagation loss (TL) increased by more than 30 dB.Furthermore, it was observed experimentally that at the location of the first shadow zone, the propagation loss in the seafloor mountain environment was reduced by nearly 7% compared with the seafloor mountain environment due to the reflection of the seafloor mountain dB. At 28 km, the propagation loss in seafloor mountain environment increases with the receiving depth, and the difference between the receiving depth 170 and the propagation loss at 1868 m is almost 10 dB. When the distance is more than 30 km, different receiving depths The acoustic propagation loss with the distance is basically the same, and the difference between most of the distances is less than 3 dB. The experimentally obtained propagation loss and pulse arrival structure agree well with the theoretical results and are explained by the ray and wave theory Due to seamounts caused by the propagation loss anomaly and pulse arrival structure.