Modeling of ocean mesoscale eddy and its application in the underwater acoustic propagation  

海洋中尺度涡建模及其在水声传播影响研究中的应用(英文)

作　　者：李佳讯[1] 张韧[1] 刘宸钊[2] 范红军[3] 

机构地区：[1]解放军理工大学气象学院、全军海洋水文环境数值模拟中心,江苏南京211101 [2]西昌卫星发射中心气象室,四川西昌615000 [3]解放军理工大学理学院,江苏南京211101

出　　处：《Marine Science Bulletin》2012年第1期1-15,共15页海洋通报（英文版）

基　　金：the National Natural Science Foundation of China (Grants No. 41176085 and 41075045), for financially supporting this research

摘　　要：Aiming at the influence of ocean mesoscale eddy on underwater acoustic propagation, a theoretical computation model of ocean mesoscale eddy was established based on the in-situ hydrographic data in the sea area of ocean mesoscale eddy. An underwater acoustic modeI-MMPE was used to simulate the acoustic propagation under the influence of different types, different intensities and positions of eddies, and different frequencies and depths of sources. It is found that warm-core eddy can make the convergence zone ＂move back＂ and the width of it increases, while cold-core eddy can make the convergence zone ＂move forward＂ and the width of it decreases. The bigger the intensity of eddy, the more notable the ＂forward ＂or ＂back ＂effect. Sound source located depths and source frequencies can change the acoustic propagation characteristics in the eddy area.针对海洋中尺度涡对水声传播的影响,利用中尺度涡区的历史水文实测数据提取涡旋强度,空间尺度等中尺度涡特征参数,建立了海洋中尺度涡理论计算模型。运用MMPE水下声场模型仿真试验研究了涡旋性质、强度和位置、声源频率和置放深度对声传播特性的影响。结果表明:暖涡使得会聚区的位置"后退",会聚区宽度增加;冷涡使得会聚区的位置"前移",会聚区宽度减小。涡旋的强度越大,"前移"或"回退"的效应越显著。

关 键 词：MMPE model mesoscale eddy model transmission loss 

分 类 号：P733.2[天文地球—物理海洋学]