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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。
The wave propagation of the Huanghai Acoustic-Internal Wave experiment was analyzed in 2005, and the amplitude fluctuation and its depth distribution of the (1) acoustic simple wave were observed. The non-linear internal wave (IW) can lead to about 5 dB fluctuation of the pulse peak through the receiving array. The vertical distribution of amplitude fluctuates in good agreement with the differential distribution of the eigenfunction of the normalized wave, and the amplitude fluctuation of the (M2) tidal signal satisfies the same depth distribution. However, the vertical phase changes of internal waves and tidal undulations are obviously different: the former eigenfunction peak signal on both sides of the reverse phase, while the latter is almost in phase. The former is determined by the relative movement of the receiver and the normalized wave distribution, and the latter depends on the compound effect of the change of the position of the simplified wave and hydrophone.