云峰水库防洪预报调度研究

针对云峰水库无防洪库容与下游防洪需求之间的矛盾,以防御常规洪水及100年一遇以下设计洪水为目标,基于现有的洪水预报方案,采用分步试算的调洪计算方法,将预报累积净雨、库水位及入库流量作为改变水库出流的判别指标,研究制定了云峰水库预报调度方案。结果表明,采用预报调度方案指导水库防洪调度能有效提高下游防洪能力,水库可在短时间内完成预泄,并有充足的退水余量确保水库回蓄,对水库兴利影响甚小,调度方案合理可行。分步试算的调洪计算方法能适应复杂的调度规则,有效解决了水位出流关系在控制水位处存在跳跃间断点的问题。

Study on Flood Forecast Operation of Yunfeng Reservoir

In view of the contradiction between flood control capacity and downstream flood control demand of Yunfeng reservoir, aiming at preventing the conventional flood and the design flood below 1% frequency as goal, based on the existing flood forecast scheme and step trial-and-error flood regulating computation method, we formulated a flood forecast operation scheme for Yunfeng reservoir, which takes the accumulated net rainfall, reservoir water level and inflow as judging indexes for changing the reservoir outflow. The results show that using forecast operation to guide the reservoir flood control operation can effectively improve the downstream flood control ability. The reservoir can complete the pre-discharge process in a short time and there are sufficient water draining margin to ensure the recovery of the water storage capacity. The forecast operation scheme is reasonable and feasible that only has little impact on economical benefits. The step trial-and-error method can adapt to the flood regulating computation with complicated operation rules. It effectively solves the problem that existing jumping point at the control water level of reservoir water level-discharge relationship.