Ⅱ型折线型实用堰流量系数计算方法

Ⅱ型折线型实用堰广泛应用于中小型水利工程中,但不同水头和堰高比值下、不同堰体形式下的流量系数尚未有全面准确的确定方案。针对工程中常用的上、下游坡度为0.5~3.0的堰体,通过室内水工模型试验,对相对堰高H/P₁值在0.2~0.5、相对堰顶厚度δ/H值在1.0~2.5情况下的Ⅱ型折线型实用堰的流量系数进行了测定;并利用相关性分析、线性回归方法,整理推导出一套简单实用的Ⅱ型折线型实用堰流量系数计算方法。该方法可为工程设计提供参考。

A Calculation Formula for Flow Coefficient of Type Ⅱ Broken-line Practical Weir

Type Ⅱ broken-line practical weir has been widely used in small and medium-sized water conservancy projects. Nevertheless, a comprehensive and correct solution to the flow coefficient of broken-line weir with varied water head and ratio of weir height is still in lack. In view of this, we determined the flow coefficient of type-II broken-line practical weir based on indoor measurements of hydraulic model test, and further deduced a simple and practical calculation formula for type II broken-line weir in association with correlation analysis and linear regression. In the laboratory hydraulic model test, the slope gradient in the upstream and downstream of weir ranges between 0.5 to 3.0, which is commonly adopted in engineering, and the relative weir height is limited between 2.0 and 0.5, and relative weir crest’s thickness between 1 and 2.5. The proposed method provides basis and reference for engineering design.