弯曲河道大型拦河水闸工程重建设计中的过闸水流流态水力学问题研究

Research on Flow Regime Hydraulics of Sluice-Passing Flows in Reconstruction Design of Large Sluice in Meandering River Channels

弯曲河道上的大型拦河水闸洪水期间过闸流量大、流态紊乱,水闸下游消能工一旦被冲刷破坏不易于修复。以重建积美拦河闸坝工程为研究对象,针对重建后的水闸如何避免现状下游消力池因冲刷形成的50000 m 2、最大深度23 m的大冲坑问题,采用改变闸孔布置和水闸轴线与河道中心线夹角的技术路线,建立二维水动力数学模型分析水位、过闸流态、冲刷的方法进行了研究,比选结果发现水闸轴线与河道中心线夹角为88°(逆时针旋转2°)、全深水闸方案合适,研究思路和方法可为同类工程提供参考。

Large sluices in meandering river channels have large sluice-passing flow rates and turbulent flow regimes during floods,and downstream energy dissipaters of the sluice cannot be easily repaired once they are damaged by erosion.Taking the reconstruction of the Jimei Sluice as a research project,this paper tries to solve the problem that how to make the reconstructed sluice avoid the large scour pit that has a size of 50000 m 2 and a maximum depth of 23 m and is formed by the erosion of current downstream stilling pools.In addition,the paper uses the technical route of changing the layout of the sluice opening and the angle between the sluice axis and the river channel centerline and establishes a two-dimensional hydrodynamic mathematical model to analyze the water level,sluice-passing flow regimes,and erosion.The results of the comparison find that the angle between the sluice axis and the river channel centerline is 88°(rotating counterclockwise by 2°),and the full-depth sluice scheme is suitable.The research ideas and methods can provide a reference for similar projects.