Application of BDRM Theory in the Two-AXIS Underwater Channel  

BDRM理论在双轴海洋声道中的应用(英文)

作　　者：张林[1] 笪良龙[1] 卢晓亭[1] 

机构地区：[1]海军潜艇学院战术水声数据中心,青岛266071

出　　处：《Marine Science Bulletin》2007年第2期12-17,共6页海洋通报（英文版）

摘　　要：Two-axis underwater channel often exists in deep ocean. Because of the coupling between surface channel and SOFAR channel, sound propagation in the two-axis underwater channel is complex and so its calculations of acoustic fields are difficult. The beam-displacement ray-mode （BDRM） theory is a normal mode method for propagation modeling in the common horizontally stratified shallow water. We improve the theory, proposing a new method for computing the upper boundary reflection coefficient, and apply it to calculate the acoustic fields of two-axis underwater channel. Transmission losses in the two-axis underwater channel are calculated by the BDRM theory. The results are in good agreement with the KRAKEN code and the computational speed excels those of the other methods.由于表面声道与深海声道间的耦合效应,声波在双轴海洋声道中的传播比较复杂,因此求解双轴海洋声道中的声场就比较困难。在 WKBZ 本征函数的基础上,推导出了参考界面相位修正的一致表达式,并将浅海声传播的波束位移射线简正波(BDRM)理论应用于计算双轴海洋声道中的声场,进行了数值模拟并与传统简正波方法进行比较,结果表明应用 BDRM 理论计算的传播损失具有很高的精度和速度,可以对双轴海洋声道内声传播问题进行分析和预报。

关 键 词：two-axis underwater channel BDRM theory reflection coefficient phase-shift correction 

分 类 号：P733.2[天文地球—物理海洋学]