| 摘要: |
| 通过构建中尺度涡的数学模型，利用射线-简正波-抛物方程（RMPE）声学模型进行传播损失计算，进而分析在深海声道、深海会聚区、海底反射3种传播模式下，中尺度涡对深海声效应的影响。数值仿真结果显示，暖涡对深海声道、会聚区产生下压效果，使会聚区水平距离变大，深海声道深度方向上变宽；冷涡使会聚区上抬，距离变短，对声场散射现象明显。研究结果表明，涡旋环境条件下，声场特征会产生显著变化。试验结果揭示了中尺度涡对深海声场效应的影响，对指导海上运用中尺度涡现象开展的科学研究、工程实践、军事运用具有积极的指导意义。 |
| 关键词: 中尺度涡 传播损失 声学模型 会聚区 |
| DOI：10.11759/hykx20190625002 |
| 分类号:P733.21 |
| 基金项目:国家重点研发计划资助项目（2017YFB0202701） |
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| Deep-sea acoustic field effect under mesoscale eddy conditions |
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ZHANG Lin1,2, LIU Dong1,2, CHEN Wen-jing2, SUN Xue-hai1,2
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1.Navy Submarine Academy, Qingdao 266199, China;2.Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China
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| Abstract: |
| Numerical simulation tests can be performed for qualitatively understanding their effect on sound propagation. In ocean eddy environments, sound wave transmission will vary greatly due to changes in the sound velocity field. In the present paper, transmission loss was calculated using the ray-normal wave-parabola equation (RMPE) acoustic model by constructing the mathematical model of the mesoscale eddy. Next, the influence of the mesoscale eddy on the sound effect in deep sea was analyzed under the following three transmission modes:deep sea channel, deep sea convergence zone, and seafloor reflection. The numerical simulation results show that the warm eddy exerts a downward pressure effect on the deep-sea sound channel and convergence zone, which increases the horizontal distance of the convergence area and broadens the depth direction of the deep-sea sound channel. Meanwhile, the cold eddy elevates the convergence area and shortens the distance of the deep-sea sound channel. This phenomenon of scattering of the sound fields is apparent. The results showed that the characteristics of sound fields will change significantly under different eddy environments. These experimental results revealed the influence of mesoscale vortices on the deep-sea sound field effect, which is significant for scientific research, engineering practices, and military applications utilizing the mesoscale vortices at sea. |
| Key words: mesoscale eddy transmission loss acoustic model convergence zone |
