复杂地形条件下天然河道水面线计算研究

Study on natural river water surface calculation under complex terrain conditions

【目的】解决复杂地形条件下天然河道间断水面线计算问题。【方法】采用预测-校正求解方法,在一维河床冲淤变形计算模型基础上,增加了急流均匀流水深与临界水深判断公式,为解决河道正坡、倒坡交替出现,突扩、突缩频繁发生的复杂地形条件下水面线计算的不连续性问题,并将该方法在黄河羊曲水电站河段进行了实例验证。【结果】建立了解决复杂地形条件下天然河道水面线计算模型,并将该模型进行实例验证,结果表明,用该模型计算的水面线与实测水面线吻合较好,可满足工程设计的精度要求。【结论】将该研究应用于黄河羊曲水电站天然河道的水面线计算,得到了原河道各级流量下的水面线,可供其上、下游水库梯级开发的水能规划部门参考应用。

【Objective】 For complex terrain conditions,a calculation method is provided to solve the interruption of natural river water surface.【Method】 By using Predictor-Corrector Method,based on the application of one-dimensional deformation of riverbed erosion and deposition calculation model,an increase of a formula to solve the river slope,down slope turns,sudden expansion,sudden contraction frequent complex terrain conditions was added to determine the uniform flow depth and critical depth,the discontinuities o...