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随机浅海环境中声传播起伏的研究,对于随机海洋环境声场预报及海洋环境参数反演和遥测都有十分重要的意义。文中对随机浅海中声传播的简正波起伏进行了研究,利用L.B.Dozier统计耦合模式方程,通过MonteCarlo数值模拟分析声速场随机变化所产生的声场起伏规律。随机声速场模型由海上温度链测量数据统计规律分析得到。结果表明,声速场随机起伏所导致的简正波幅度起伏远高于声压的起伏;当声源处在某一阶简正波的敏感深度位置时,该阶简正波的闪烁系数会比简正波幅度起伏方差高2～3个量级;在所分析随机声速场模型下,声压起伏方差、简正波幅度起伏方差及简正波闪烁系数随距离的增加基本上是线性增大。
The study of acoustic propagation fluctuations in a random shallow sea environment is very important for the prediction of sound field in random ocean environment and retrieval and telemetry of marine environmental parameters. In this paper, the fundamental wave undulation of acoustic propagation in a random shallow sea is studied. By using L.B.Dozier statistical coupling equation equation, Monte Carlo numerical simulation is used to analyze the fluctuation of the acoustic field generated by the random variation of the sonic velocity field. The random acoustic velocity model is obtained from the statistic analysis of the sea temperature chain measurement data. The results show that the fluctuation of the amplitude of the normalized wave due to the random fluctuation of the sound velocity field is much higher than the fluctuation of the sound pressure. When the sound source is in a sensitive depth position of a certain order simple wave, the scintillation coefficient of the simple normal wave will be 2 ~ 3 orders of magnitude. Under the random sound velocity field model analyzed, the fluctuation of sound pressure fluctuation, the amplitude of simple wave amplitude undulation and the normalized wave flicker coefficient increase linearly with the increase of distance.