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首页> 外文期刊>Journal of computational acoustics >SIMULATION OF UNDERWATER ACOUSTICAL FIELD FLUCTUATIONS IN RANGE-DEPENDENT RANDOM ENVIRONMENT OF SHALLOW SEA
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SIMULATION OF UNDERWATER ACOUSTICAL FIELD FLUCTUATIONS IN RANGE-DEPENDENT RANDOM ENVIRONMENT OF SHALLOW SEA

机译：浅海随机依赖环境中水下声场波动的模拟

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摘要

To investigate statistical problem of moderate to low-frequency sound scattering on the two-dimensional (2D) random inhomogeneities of a shallow sea with horizontal boundaries (bottom and surface) and loss local-mode approach has been utilized. An explicit-form solution by quadrature for modal amplitudes as a function of distance is represented. In adiabatic approximation asymptotical estimations have been performed, which demonstrate how medium weak fluctuations influence the local eigenvalues and statistical characteristics of a field. It is shown that general effects previously established while studying the random layered problem keep the force. Spatial scales of statistical influence and laws of dependences are determined. Also it follows from the analysis of the explicit-form solution for modal amplitudes that in this shallow-sea model with horizontal boundaries and in the absence of regular variations of sound speed the coupling of modes is insignificant. General statistical effects are described well within the framework of adiabatic approximation.
机译：为了研究在具有水平边界（底部和表面）的浅海的二维（2D）随机不均匀性上中等至低频声音散射的统计问题，并采用了损失局部模式方法。表示了模态振幅与距离的函数的正交显式形式。在绝热近似中，已进行了渐近估计，这表明中等程度的微弱波动如何影响场的局部特征值和统计特性。结果表明，先前在研究随机分层问题时建立的一般效应保持了作用力。确定了统计影响力的空间尺度和依赖性法则。从对模态振幅的显式解的分析还可以得出，在具有水平边界的浅海模型中，在没有声速规则变化的情况下，模态的耦合是微不足道的。在绝热近似的框架内很好地描述了一般的统计效果。

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