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借助风浪实验现场的破碎事件记录,采用多种判据同时判别的方法划分破碎波与非破碎波,考查了各种破碎判据指标在破碎波与非破碎波上的分布差异。结果表明:依Hilbert变换计算的动力学判据指标和运动学判据指标在破碎波与非破碎波上的分布有明显分离,存在一个稳定的阈值区分破碎波与非破碎波;由小波方法计算的动力学判据指标在破碎波与非破碎波上的分布往往也有明显分离,但不存在一个稳定的阈值;波陡等反映波面不对称性的几何指标、瞬时波面斜率以及波高、波面极大值、波长、周期等,在破碎波非破碎波上的分布有着不同程度的交叠,无法有效区分破碎波与非破碎波。
Based on the records of the crushing event in the wind-wave experiment site, the disintegration wave and the non-breaking wave were divided by multiple criteria simultaneously, and the differences of the distribution indexes of the breaking criterion and the non-breaking wave were examined. The results show that the distributions of kinetic criterion and kinematic criterion calculated by Hilbert transform are obviously separated on the broken wave and the non-broken wave, and there is a stable threshold to distinguish the broken wave from the non-broken wave. The wavelet method The dynamic criterion index is also obviously separated on the broken wave and the non-broken wave, but there is not a stable threshold. The geometric indexes such as steep wave reflecting the asymmetry of the wave surface, the slope of the instantaneous wave surface, the wave height and the wave height are very large Value, wavelength, period, etc., have different degrees of overlap in the distribution of the non-broken wave, and can not effectively distinguish the broken wave from the non-broken wave.