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工程力学  2013 

聚焦波浪在潜堤上传播变形的数值模拟

DOI: 10.6052/j.issn.1000-4750.2011.12.0880, PP. 466-471

Keywords: Boussinesq方程,波浪变形,聚焦波浪,非线性,能量传递

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Abstract:

该文以一组色散关系得到改进的完全非线性Boussinesq方程建立了一个波浪模型,通过与均匀水深条件下聚焦波浪的实验结果进行对比说明该模型可以很好的模拟聚焦波浪,然后应用该模型聚焦波浪在一前后坡度对称的潜堤上的非线性传播变形。结果表明:随着水深的减小波峰越来越尖,波谷越来越平坦,所对应的能谱在高次谐频部分也有较大的增长,但在堤顶部分和反变浅区域,波浪的群性随着水深的增大而越来越不明显,对应的频谱表明在这段区域内有反向能量传递存在。另外,在反变浅区域主波频率附近的自由波能量有所增加,这说明频率的峰度也会减小。

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