Observation of strongly non-Gaussian statistics for random sea surface gravity waves in wave flume experiments.
Observation of strongly non-Gaussian statistics for random sea surface gravity waves in wave flume experiments.
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DOI：
10.1103/physreve.70.067302
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发表时间：
2004-12
期刊：
影响因子：
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通讯作者：
M. Onorato;A. Osborne;M. Serio;L. Cavaleri;C. Brandini;C. Stansberg
中科院分区：
文献类型：
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作者：
M. Onorato;A. Osborne;M. Serio;L. Cavaleri;C. Brandini;C. Stansberg
我们研究随机表面重力波场，并在实验室环境中解决大振幅波的形成。实验在世界上最大的波浪水槽设施之一进行。我们提出的实验证据表明，波高的概率密度函数的尾部强烈依赖于Benjamin-Feir指数（BFI）-即，波的陡度和光谱带宽之间的比率。虽然对于一个小的BFI的概率密度函数实验获得的瑞利分布是一致的，对于一个大的BFI的瑞利分布显然低估了大事件的概率。这些结果从实验上证实了随机谱中的大振幅波可能是调制不稳定性的结果。
We study random surface gravity wave fields and address the formation of large-amplitude waves in a laboratory environment. Experiments are performed in one of the largest wave tank facilities in the world. We present experimental evidence that the tail of the probability density function for wave height strongly depends on the Benjamin-Feir index (BFI)-i.e., the ratio between wave steepness and spectral bandwidth. While for a small BFI the probability density functions obtained experimentally are consistent with the Rayleigh distribution, for a large BFI the Rayleigh distribution clearly underestimates the probability of large events. These results confirm experimentally the fact that large-amplitude waves in random spectra may result from the modulational instability.