驼峰堰堰后收缩断面水深计算的研究

Study on Calculation of Water Depth of Contraction Section Behind Hump Weir

文中通过典型算例,用泄水建筑物下游收缩断面水深计算公式计算驼峰堰堰后水深时,发现取流速系数Φ=1的常规计算方法所得结果与实际情况相矛盾的问题。针对这一问题,通过分析流速系数Φ代表的物理意义,采用不同取值进行计算;结合柱体恒定非均匀流渐变流的水面线原理,对不同的计算结果进行深入分析,选取出了符合算例的计算结果;总结出了驼峰堰堰后下游收缩断面水深计算的具体方法。同时,文中总结分析了流速系数Φ=1时的泄水建筑物下游收缩断面水深计算公式的适用情况。驼峰堰在水利工程中也是较常见的水工建筑物,对它的研究具有普遍的现实意义,在水利工程设计中应该引起设计人员的高度重视。

In this paper,through a typical example,when the water depth behind hump weir is calculated by the formula of water depth at contraction section downstream of discharge structure,it is found that the result obtained by the conventional calculation method with velocity coefficient Φ=1 is inconsistent with the actual situation.In order to solve this problem,the author analyzes the physical meaning of velocity coefficient Φ,and uses different values to calculate;combined with the water surface profile principle of constant non-uniform flow gradient flow in cylinder,the different calculation results are analyzed in depth,and the calculation results in accordance with the calculation example are selected;the specific method for calculating the water depth of downstream contraction section behind hump weir is summarized.At the same time,the paper summarizes and analyzes the applicability of the formula for calculating the water depth of the downstream contraction section of the discharge structure when the velocity coefficient is Φ=1.The hump weir is also a common hydraulic structure in water conservancy projects.The research on hump weir is of universal practical significance,which should be attached great importance by designers in the design of water conservancy projects.