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arXiv 2005.14193nlin.PSphysics.flu-dyn
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非均匀水深上随机波产生呼吸波和无赖波的实验研究

Experimental study of breathers and rogue waves generated by random waves over non-uniform bathymetry

A. Wang, A. Ludu, Z. Zong, L. Zou, Y. Pei

摘要:

描述随机的,单向的,长峰,水波超过非均匀水深的实验结果证实了稳定的相干波包几乎均匀的群速度旅行的形成。用JONSWAP谱生成了不同陡度、不同高度和恒定周期的波浪。对实验数据进行了一系列统计处理,包括峰度、偏度、BFI、傅立叶谱和移动傅立叶谱的时空变化以及波高的概率分布。稳定的波包形成的随机场和浅滩,山谷和斜坡上的旅行进行了比较,NLS方程的精确解产生良好的匹配,并证明这些软件包是非常相似的深水呼吸器的解决方案,生存在非均匀测深。我们还提出了事件的形成流氓波在这些地区的BFI,峰度和偏度系数具有最大值。

英文摘要:

Experimental results describing random, uni-directional, long crested, water waves over non-uniform bathymetry confirm the formation of stable coherent wave packages traveling with almost uniform group velocity. The waves are generated with JONSWAP spectrum for various steepness, height and constant period. A set of statistical procedures were applied to the experimental data, including the space and time variation of kurtosis, skewness, BFI, Fourier and moving Fourier spectra, and probability distribution of wave heights. Stable wave packages formed out of the random field and traveling over shoals, valleys and slopes were compared with exact solutions of the NLS equation resulting in good matches and demonstrating that these packages are very similar to deep water breathers solutions, surviving over the non-uniform bathymetry. We also present events of formation of rogue waves over those regions where the BFI, kurtosis and skewness coefficients have maximal values.

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