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Effects of different configurations of sloping crests and upstream and downstream ramps on the discharge coefficient for broad-crested weirs
Journal of Hydrology ( IF 5.9 ) Pub Date : 2021-09-14 , DOI: 10.1016/j.jhydrol.2021.126940
Bahram Nourani 1 , Hadi Arvanaghi 1 , Farzin Salmasi 1
Affiliation  

Weirs are commonly used for controlling, measuring, and regulating water flow in conveyance structures such as canals or dams. In this study, hydraulic properties of flow over broad-crested weirs including the effects of different sloping crests and upstream and downstream ramps were characterized by using the finite volume method. Numerical simulations were validated by experimental results; the numerical simulations are very similar to the experimental results. The discharge coefficient (Cd) for the broad-crested weir with upstream and downstream ramps and positive slope of crest (BCW-UDR-PSC) and the broad-crested weir with upstream and downstream ramps and negative slope of crest (BCW-UDR-NSC) are higher than the broad-crested weir with upstream and downstream ramps and horizontal crest (BCW-UDR-HC). It was found that for both the BCW-UDR-NSC and the BCW-UDR-PSC, the Cd increases with steeper weir crest slope. This shows that the Cd is affected by the slope of the crest such that the negative sloped crest more significantly increases the Cd than a positive slope. The average increase in value of the Cd for the BCW-UDR-NSC with respect the BCW-UDR-PSC is approximately 8%.



中文翻译:

不同坡顶及上下游坡道配置对宽顶堰流量系数的影响

堰通常用于控制、测量和调节输送结构(如运河或水坝)中的水流。在这项研究中,使用有限体积法表征了宽顶堰上流动的水力特性,包括不同坡顶和上下游坡道的影响。数值模拟得到了实验结果的验证;数值模拟与实验结果非常相似。排出系数(C ^ d用于与上游和下游斜面和波峰(的正斜率的宽顶堰)BCW-UDR-PSC)中,用上游和下游斜面和波峰的负斜率(宽顶堰BCW-UDR -NSC) 高于带有上下游斜坡和水平坝顶的宽顶堰 ( BCW-UDR-HC )。发现对于BCW-UDR-NSCBCW-UDR-PSCC d随堰顶坡度的增加而增加。这表明C d受波峰斜率的影响,因此负倾斜波峰比正斜率更显着地增加了C d。在的值的平均增加Ç dBCW-UDR-NSC相对于BCW-UDR-PSC是约8%。

更新日期:2021-09-24
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