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研究了浅海非线性内波对远程混响场的影响。通过分析非线性内波活动引起声源到海底散射元以及散射元到接收点之间的声传播变化,给出了非线性内波引起远程混响强度变化的表示,建立了非线性内波存在下的浅海远程混响模型,数值计算了非线性内波运动引起远程混响强度的变化。理论和数值计算表明,非线性内波的活动能够引起远程混响强度的变化,在某些情况下会导致远程混响强度增强。通过讨论非线性内波引声简正波的耦合效应,给出了其引起远程混响强度增强的原因。
The influence of shallow sea non-linear internal wave on remote reverberation field is studied. By analyzing the propagation of nonlinear internal waves, the acoustic propagation from the sound source to the seafloor and the scattering element to the receiving point is caused. The representation of the variation of the long-range reverberation intensity caused by the nonlinear internal waves is given. The existence of nonlinear internal waves Under the shallow sea remote reverberation model, the change of the long-range reverberation intensity is calculated numerically. Theoretical and numerical calculations show that the activity of the nonlinear internal wave can cause the change of the long-range reverberation intensity and in some cases the long-range reverberation intensity can be enhanced. By discussing the coupling effect of the simple acoustic wave of the nonlinear internal acoustic wave, the reason why the intensity of the remote reverberation is increased is given.