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首页> 外文期刊>Journal of Hydraulic Engineering >Scour on Alluvial Bed Downstream of Grade-Control Structures
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Scour on Alluvial Bed Downstream of Grade-Control Structures

机译：坡度控制结构下游冲积层冲刷

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摘要

This paper describes an approach for predicting local scour downstream of grade control structures. The developed analysis applies the incomplete self-similarity (ISS) theory for deducing some physically based dimensionless groups controlling the geometrical pattern of the scour profile. The scour measurements available in the literature in conjunction with numerous unpublished data allow a multiregressive calibration of the ISS relationships. The experimental sample includes different bed grain-size distributions and scales of the erosive phenomenon. The results prove that the ratio between the upstream water head and the weir height is able to explain the measurements of scour depth carried out in both small- and large-scale installations. This estimation of maximum scour depth was improved, introducing variables representative of both the jet contraction and the bed particle grain-size distribution. Variables related to the longitudinal sizes of the scour profile tend to be predicted with more accuracy than those related to the scour depth and appear more influenced by the coarsest component of the alluvial bed.
机译：本文介绍了一种预测坡度控制结构下游局部冲刷的方法。发达的分析应用不完全自相似性（ISS）理论来推导控制冲刷轮廓的几何图案的一些基于物理的无量纲基团。文献中提供的冲刷测量与大量未发布的数据结合在一起，可以对ISS关系进行多回归校准。实验样品包括不同的床粒度分布和侵蚀现象的尺度。结果证明，上游水头与堰高之间的比率能够解释在小型和大型装置中进行的冲刷深度的测量。改进了对最大冲刷深度的估计，引入了代表射流收缩和床颗粒尺寸分布的变量。与冲刷深度的纵向变量有关的变量比与冲刷深度有关的变量趋于更准确地预测，并且似乎受到冲积床最粗成分的影响更大。

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