浅海孤子内波对水平纵向相关性的影响  

Effect of shallow sea soliton internal waves on horizontal and longitudinal correlations

作　　者：张泽众 骆文于[1] 庞哲 周益清 ZHANG Zezhong;LUO Wenyu;PANG Zhe;ZHOU Yiqing(State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院声学研究所声场声信息国家重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《应用声学》2019年第5期851-856,共6页Journal of Applied Acoustics

基　　金：国家自然科学基金项目(11774374)

摘　　要：基于简正波理论和孤子内波模型,该文推导出声线经过孤子内波后的频域上的声压表达式,然后利用声压表达式推导出水平纵向相关系数一般表达式,研究了浅海孤子内波引起的声场水平纵向相关系数的变化,并且运用二维抛物方程模型仿真计算验证理论推导结果,并在简正波干涉环境下给出物理现象解释。结果表明,孤子内波引起的浅海声场水平纵向相关系数变化,乃由简正波干涉所导致,当孤子内波幅度变化不是很大时,其幅度改变不会引起水平纵向相关系数周期和幅度的显著变化。文中给出特定环境下的水平纵向相关系数随时间变化的结果,当环境中第一、第二号简正波占主导地位时,水平纵向相关系数会呈现出周期变化。The expression of acoustic pressure in the frequency domain is derived by using the two boundary of the soliton based on the normal wave theory and soliton wave model. The variation law of horizontal longitudinal correlation coefficient with time in the presence of the internal wave is derived theoretically and the model of parabolic equation is used to verify the theoretical derivation. The results show that because of the interference of normal wave, the internal soliton wave will cause the change of horizontal longitudinal correlation coefficient. The result of the variation of horizontal longitudinal correlation coefficient with time in a given environment is given in this paper, when the first and second normal waves are dominant in the horizontal waveguide, the horizontal longitudinal correlation coefficient will have periodic variation, and the period doesn’t change with extent of amplitude.

关 键 词：孤子内波 水平纵向相关性 简正波干涉 抛物方程 

分 类 号：P733.2[天文地球—物理海洋学]