一级直线边墙窄缝挑坎参数选择与冲坑深度估计

Choice of slit-type bucket parameters and estimation of scour hole depth

以理论关系为基础给出了一级直线边墙窄缝挑坎的边墙收缩角、收缩比和挑坎出口底板竖向挑角的确定方法,对任意选择的6个工程采用建议方法得到的计算值与它们的选用值一致;还给出了估计窄缝挑坎后冲刷坑深度的经验表达式,计算结果与几个文献中的实测结果基本一致.

Based on the theoretical analyses, the representations for determining the parameters as the contraction ratio of the width and the deflections of the side walls and the bottom of the slit-type bucket are obtained. The calculated results of some engineering casually chosen by these representations are coincident with the designed parameters based on the hydraulic models. An empirical representation for estimating the scour hole depth caused by the flood-relief with the slit-type bucket is also given. The comparisons show that the results of calculations are consistent with those of some experiments in the literatures on the whole.