Laboratory Measurements of Void Fraction and Turbulence in the Bore Region of Surf Zone Waves
Laboratory Measurements of Void Fraction and Turbulence in the Bore Region of Surf Zone Waves
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海浪区波孔区空隙率和湍流的实验室测量
DOI：
10.1061/(asce)0733-9399(2003)129:10(1197
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Sungwon Shin
中科院分区：
文献类型：
--
作者：
D. Cox;Sungwon Shin
实验室测量的瞬时自由表面，水平速度，和空隙率的波动，同时为三种情况下的规则波打破一个平面斜坡。数据减少合奏平均，以量化的湍流强度和空隙率的时间变化的波谷以上的破碎波的掺气区的水平。测量的跨岸位置被限制在波高快速下降的过渡区。研究表明，最大整体平均空隙率在15%和20%之间，并且静水水位以上的归一化空隙率的时间变化可以通过线性增长然后指数衰减来建模。由波浪周期和平均空隙率归一化的静水上方空隙率的时间变化似乎是自相似的。
Laboratory measurements of the instantaneous free surface, horizontal velocity, and void fraction fluctuations were made simultaneously for three cases of regular waves breaking on a plane slope. The data were reduced by ensemble averaging to quantify the temporal variation of the turbulence intensity and void fraction above trough level in the aeration region of the breaking waves. The cross-shore location of the measurements was restricted to the transition region marked by a rapid decrease in wave height. The study showed that the maximum ensemble-averaged void fractions were between 15 and 20% and that the temporal variation of the normalized void fraction above the still water level could be modeled by linear growth followed by exponential decay. The temporal variation of void fraction above the still water normalized by the wave period and average void fraction appears to be self-similar.