Study on the relative hydraulic characteristics of skimming flow on stepped spillways

被引：0

作者：

Ma P. ^{[1
]}

Hu Y. ^{[1
]}

Liu H. ^{[1
]}

机构：

[1] College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling

来源：

Shuili Xuebao/Journal of Hydraulic Engineering | 2020年 / 51卷 / 08期

关键词：

Experimental study; Linear correlation; Relative hydraulic characteristics; Skimming flow; Stepped spillway;

D O I：

10.13243/j.cnki.slxb.20200114

中图分类号：

学科分类号：

摘要：

The stepped spillway has remarkable energy dissipation effect, can greatly reduce the size of the downstream stilling basin, and save the engineering quantity and investment, but the flow characteristics is complex. Three relative hydraulic parameters of stepped spillway such as relative velocity, relative Froude number and relative energy dissipation rate are introduced by comparing stepped spillway with smooth spillway of the same shape. Through three different model tests, the variation law of three conventional hydraulic parameters such as velocity, Froude number, energy dissipation rate and three relative hydraulic parameters along the stepped spillway, and the influence of relative critical water depth and spillway slope on conventional and relative hydraulic parameters are analyzed. The results show that the conventional hydraulic parameters of stepped spillway are complicated along the way and the influence of relative critical water depth and spillway slope on conventional hydraulic parameters is also complex, which are inconvenient for application. The relative hydraulic parameters of stepped spillway show good linear correlation along the way, with the average correlation coefficient ranging from 0.9887 to 0.9944. The relative hydraulic parameters decrease with the increase of the relative critical water depth, and increase with the increase of the spillway slope. Through quantitative analysis of linear characteristics of relative hydraulic parameters along the stepped spillway, and combined with the mature hydraulic calculation theory of smooth spillway, a new method can be provided for the calculation of complex hydraulic characteristics of stepped spillway. © 2020, China Water Power Press. All right reserved.

引用

页码：997 / 1007

页数：10

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