On the threshold for wave breaking of two-dimensional deep water wave groups in the absence and presence of wind
On the threshold for wave breaking of two-dimensional deep water wave groups in the absence and presence of wind
复制标题
无风和有风情况下二维深水波群的破浪阈值
DOI：
10.1017/jfm.2016.776
复制
发表时间：
2016
影响因子：
3.7
通讯作者：
M. Allis
中科院分区：
文献类型：
--
作者：
A. Saket;W. Peirson;M. Banner;X. Barthélémy;M. Allis
Barthelemy 等人提出的断裂开始阈值。 （arXiv：1508.06002v1，2015）已在实验室中对深水中的单向波群进行了研究，并扩展到包括不同类别的波群和中等风力。热图像测速用于比较波峰点（最大高程和最大点）地表水粒子速度 ( $U_{s}$ ) 的测量值与由一系列紧密间隔的波浪计确定的波峰点速度 ( $C$ )。发现区分最大复发和边缘断裂的波峰点表面能通量比 $B_{x}=U_{s}/C$ 为 $0.840\pm 0.016$ 。将风力强迫从零增加到 $U_{\unicode[STIX]{x1D706}/4}/C_{0}=1.42$ 会系统地将该阈值增加 2%。增加光谱带宽（将 Benjamin-Feir 指数从 0.39 降低到 0.31）系统性地将阈值降低了 1.5%。
The threshold for the onset of breaking proposed by Barthelemy et al. (arXiv:1508.06002v1, 2015) has been investigated in the laboratory for unidirectional wave groups in deep water and extended to include different classes of wave groups and moderate wind forcing. Thermal image velocimetry was used to compare measurements of the wave crest point (maximum elevation and also the point of maximum) surface water particle velocity ( $U_{s}$ ) with the wave crest point speed ( $C$ ) determined by an array of closely spaced wave gauges. The crest point surface energy flux ratio $B_{x}=U_{s}/C$ that distinguishes maximum recurrence from marginal breaking was found to be $0.840\pm 0.016$ . Increasing wind forcing from zero to $U_{\unicode[STIX]{x1D706}/4}/C_{0}=1.42$ systematically increased this threshold by 2 %. Increasing the spectral bandwidth (decreasing the Benjamin–Feir index from 0.39 to 0.31) systematically reduced the threshold by 1.5 %.