Affected by higher Rayleigh wave modes in the surface wave field, the effective phase velocity obtained by spectral analysis of surface waves SASW.

由分层介质表面两不同点响应互谱分析(SASW)得到的有效相速度并不对应于面波基阶模态相速度，它与波场中高阶模态能量分配比例有关。

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The free surface effects of random wave forces are studied by means of nonlinear spectral analysis and a new calculating model is proposed.

应用非线性谱分析法对随机波浪载荷的自由表面效应进行了研究，提出了一种新的计算模型。

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