摘要
分析2005黄海声传播—内波实验传播起伏数据,观察(1)号声简正波幅度起伏及其深度分布特征。非线性内波(IW)通过接收阵可以导致脉冲峰值约5 dB起伏,幅度起伏垂向分布与简正波本征函数的微分分布吻合良好,(M2)潮致信号幅度起伏也满足相同深度分布特性。然而内波和潮致起伏的垂向相位变化明显不同:前者本征函数峰值两侧起伏信号反相,而后者近乎同相。前者由接收器与简正波分布的相对移动决定,而后者取决于简正波和水听器位置变化的复合效应。
We report experimental results of 2005 Yellow-Sea acoustic experiment on interaction of ocean internal waves. Broadband normal modal amplitude fluctuations and depth dependences due to internal waves and tide are considered. It is found amplitude fluctuations above 5 dB when nonlinear ocean internal waves （IW） are passing receiver array, and their depth dependences are well coincided with theoretical results, satisfying the differential curve of corresponding 1St. normal modal function. The modal fluctuation amplitude due to M2 tide shows similar properties, however, the phase changes in IW and tide cases are significant different. Displacement of the modal function with respect to hydrophones is responsible for the former, however latter is determined by a composition of changes of the modal function and displacement of hydrophones.
出处
《声学学报》
EI
CSCD
北大核心
2010年第1期38-44,共7页
Acta Acustica
基金
高等学校学科创新引智计划项目(B07018)
