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首页> 外文期刊>International Journal of Ocean and Coastal Engineering >Decelerating bores in channels and estuaries
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Decelerating bores in channels and estuaries

机译：减速孔通道和河口

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摘要

Decelerating bores are commonly seen in shorelines, estuaries and rivers in forms of swash run-up, tidal bores, tsunami bores. A decelerating bore propagating upstream can gradually change its shape, finally becoming an arrested bore, i.e. a stationary hydraulic jump. New experiments on decelerating bores against an adverse slope were conducted. Observations highlighted various types of arrested bores: fully breaking jumps, partially breaking jumps and non-breaking undular jumps. Measurements were repeated at least 25 times to obtain ensemble-averaged data with regards to instantaneous median and fluctuations of free-surface elevation, velocity components and turbulent shear stresses. An abrupt rise of free-surface elevation and immediate decrease in stream-wise velocity were observed during the passage of a decelerating bore. The arrival of decelerating bores induced some drastic increase of instantaneous free-surface fluctuations and all velocity components. Large-amplitude Reynolds stresses and extreme Reynolds stress fluctuations occurred in the same phase during and after the passage of decelerating bores. Histogram analysis of instantaneous normal and tangential Reynolds stresses suggested a preponderance of relatively smaller amplitudes. The upstream propagation of decelerating bores increased the probability density of large normal and tangential Reynolds stresses, yielding extrema vastly exceeding the critical threshold for inception of sediment motion.
机译：减速孔中常见海岸线,河口和河流的形式冲洗前,海啸潮汐孔,孔。减速孔上游传播逐步改变其形状,最后成为一个逮捕了孔,即静止的水跃。新实验减速对一个孔反坡进行了。强调了各种类型的逮捕孔:完全打破跳跃,部分打破跳跃和不换行undular跳跃。重复至少25次获得至于ensemble-averaged数据瞬时值和波动的自由表面高度、速度和组件湍流剪应力。自由表面高度和立即下降stream-wise速度被观察到通过减速了。减速孔诱导一些急剧增加瞬时的自由表面波动和所有速度组件。压力和极端的雷诺应力波动发生在相同的阶段期间和之后通过减速孔。瞬时正常和切向雷诺强调提出了相对的优势更小的振幅。减速孔的概率增加密度大的正常和切向雷诺压力,产生极值大大超过了《盗梦空间》的关键阈值的沉积物运动。

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