A laboratory study of wave crest statistics and the role of directional spreading

A laboratory study of wave crest statistics and the role of directional spreading
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波峰统计和定向传播作用的实验室研究

DOI:
10.1098/rspa.2012.0696
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发表时间:
2013
期刊:
Mathematical, Physical and Engineering Sciences
影响因子:
--
通讯作者:
Latheef M
Latheef M
中科院分区:
--
文献类型:
--
作者:
Latheef M

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本文讨论了在频率和方向上都是宽带的海况下的波峰高度统计。一组新的实验室观察,并与常用的统计分布的结果进行比较。作为一个整体,数据证实,波峰高度分布是严重依赖于海况的方向性。虽然在三阶及以上的非线性效应是最明显的单向海洋,目前的数据表明,它们也是重要的定向传播的海洋,提供的海洋是足够陡峭,而不是太短的波峰。这些数据还突出了波浪破碎的限制作用。由于单个破碎事件取决于当地波陡度,海况的方向性再次起着重要作用。事实上,目前的观察证实,非线性放大和波浪破碎的两个竞争过程可以对波峰高度分布产生深远的影响,导致显着偏离既定的理论。在这种情况下,关键的参数是海况陡度和方向扩展;后者的作用,以抵消前者的波峰高度分布的非线性变化。
This paper concerns the crest height statistics arising in sea states that are broad banded in both frequency and direction. A new set of laboratory observations are presented and the results compared with the commonly applied statistical distributions. Taken as a whole, the data confirm that the crest-height distributions are critically dependent upon the directionality of the sea state. Although nonlinear effects arising at third order and above are most pronounced in uni-directional seas, the present data show that they are also important in directionally spread seas, provided the seas are sufficiently steep and not too short crested. The data also highlight the limiting effects of wave breaking. With individual breaking events dependent upon the local wave steepness, the directionality of the sea state again plays a significant role. Indeed, the present observations confirm that the two competing processes of nonlinear amplification and wave breaking can have a profound influence on the crest-height distributions leading to significant departures from established theory. In such cases, the key parameters are the sea state steepness and directional spread; the latter acting to counter the former in terms of nonlinear changes in the crest-height distributions.
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