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首页> 外文会议>International Conference on Fluvial Hydraulics Vol.2, Sep 4-6, 2002, Louvain-LA-Neuve, Belgium >Local scouring at grade-control structures in mountain rivers: laboratory and field data
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Local scouring at grade-control structures in mountain rivers: laboratory and field data

机译：山区河流坡度控制结构的局部搜寻：实验室和现场数据

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摘要

Grade-control structures such as bed sills and check-dams are widely used in staircase-like systems in steep mountain rivers where incision has to be prevented. These transverse works produce major local scouring due to the free jet issuing from their crest, which may lead to undermining of the foundations. In order to study local scouring downstream of these control structures, an experimental research has been carried out at the HR Wallingford Ltd. laboratories, consisting of 26 clear-water runs with a well-graded sediment mixture. Laboratory results are compared to field data collected in four Alpine rivers (15 scour holes) with slopes ranging from 0.05 to 0.20 where systems of bed sills and check-dams have long been constructed. A semi-empirical equation for maximum depth previously obtained by the authors is shown to predict Held data rather satisfactorily, with a mean relative error of 8.7%. Features of scour hole geometry such as the length-to-depth ratio and the relative distance for maximum depth are analysed too.
机译：诸如床槛和止水坝之类的坡度控制结构广泛用于陡峭山区河流中需要防止切口的阶梯状系统中。这些横向工程由于其波峰发出的自由射流而在当地产生大量冲刷，这可能导致地基的破坏。为了研究这些控制结构下游的局部冲刷，已在HR Wallingford Ltd.实验室进行了一项实验研究，该实验室由26条清水流和分级良好的沉积物混合物组成。将实验室结果与在坡度从0.05到0.20的四个高山河流（15个冲洞）中收集的现场数据进行比较，在那里长期建造了床槛和防洪坝系统。作者先前获得的最大深度的半经验方程式可以令人满意地预测Held数据，平均相对误差为8.7％。还分析了冲孔几何形状的特征，例如长深比和最大深度的相对距离。

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