Separation of obliquely incident and reflected irregular waves by the Morlet wavelet transform
Separation of obliquely incident and reflected irregular waves by the Morlet wavelet transform
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DOI：
10.1016/j.coastaleng.2011.03.014
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发表时间：
2011-08
期刊：
影响因子：
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通讯作者：
Yuxiang Ma;G. Dong;Xiaozhou Ma
中科院分区：
文献类型：
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作者：
Yuxiang Ma;G. Dong;Xiaozhou Ma
一种现有的通过小波变换分离不规则入射波和反射波的二维时域方法[Ma et al., 2010。一种通过 Morlet 小波变换分离二维入射波和反射波的新方法。 Coastal Eng., 57(6):597–603] 被扩展以解释在倾斜底部传播的倾斜入射的不规则波浪。采用线性浅滩和折射系数来确定波浪的幅度和相位变化。 Morlet小波的最佳中心频率由最小Shannon小波熵决定。数值试验表明，该方法可以准确地分离水平深度上的波浪。然而，对于倾斜底部的波，分离误差随着底部坡度的增加而增加，并且对于入射角大于π/3的波来说是显着的。
An existing 2D time-domain method for separating irregular incident and reflected waves by wavelet transform [Ma et al., 2010. A new method for separation of 2D incident and reflected waves by the Morlet wavelet transform. Coastal Eng., 57(6):597–603] is extended to account for obliquely incident irregular waves propagating over sloping bottoms. The linear shoaling and refraction coefficients are adopted to determine the amplitude and phase changes of waves. The optimal central frequency of the Morlet wavelet is determined by the minimum Shannon wavelet entropy. Numerical tests show that the present method can accurately separate waves over horizontal depths. For waves at sloping bottoms, however, the separation errors increase as bottom slope increases and are significant for waves with incident angle larger thanπ/3.