立堵截流龙口流速变化规律及淹没标准的研究

为了研究立堵截流龙口流速变化规律,本文从一般水力学公式出发,推导出进占过程中龙口流速的计算公式,并用图解法,研究了矩形河槽立堵龙口最大流速出现的规律。对泄水规律、护底高度、下游壅水和加宽戗堤等可能具有的削减最大流速的作用和条件进行了探讨,得到了一些新的初步结论。本文还对淹没标准和流速系数进行了试验研究。

A study of the Regulaions of Varying Velocity and the Modular limit for Closiug End-Tipped Banks at the Gap in Rivers

In order to study the regulations of varying velocity at the gap in rivers, the formulas for calculating the value of velocity occuring during closure have been derived from the general hydraulic formulas in this paper (with the graphic method). Furthermore, the regulations of the maximun velocity occuring at the gap of rectangular rivers have been studied by means of the graphic method. In the case of varying discharge through diversion, lifting the height of protection on the gap bed, raising downstream level and widening the bank etc, the possible effect and condition of decreasing the maximun velocity have also been investigated. Some new conclusions have been reached. In this paper, the experimental studies of the modular limit and the Velocity coefficient were also made.