渠道超高设计探讨

为适应长距离、大流量的输水渠道超高设计,采用节制闸控制技术,考虑了水流涌波,通过典型渠道的非恒定流水力学数值模拟方法,研究了大量渠道水流变化过程中水位变化幅度的案例。根据模拟计算结果,拟合出一条流量─最小超高值关系曲线,供渠道设计参考。

Research on Canal Freeboard Design Criteria

The criterion on canal freeboard design does not suit to the canal design of the long-distance and large flow capacity water transfer pro-ject in China. The flow change of the water level rising of transient flow wave wasn't considered in canal design before. But according to the expe-rience of canal operation, the water level was rising upward when the flow changes acted as an important factor. If ignoring the water level rising, the canal operation must be failing or the flexibleness of water supply will be lost. This paper studied a great many of the cases of canal flow chan-ges and different flow capacities using the unsteady flow simulation method, and presented the curve fitting relation of the most height and flow capacity,it can be applied to the canal freeboard design.