流域联合调度方式下大岗山水库汛期调度方案研究

Research on the Dagangshan Reservoir Operation in Flood Seasons Based on the Cascade Joint Operation in Dadu River

为充分发挥大渡河流域梯级水库群的防洪作用,以大岗山水库为主要研究对象,剖析水库现行调度方式存在的问题,针对不同的来水情况,考虑梯级水库防洪能力、大岗山水库水文气象预报精度及其下游河道的安全泄量,分别采用梯级调洪演算法和改进预泄能力约束法,研究水库处于流域联合防洪状态下的调洪指标和处于较小来水情况下的动态控制指标,制定防洪调度与实时调度相结合的大岗山水库汛期调度方案。典型洪水实例演算表明:来水较大时,大岗山水库可削减洪峰流量530 m^(3)/s,一定程度上减轻下游断面的防洪压力;来水较小时,可在保证自身安全的前提下,提高水库的经济效益0.06~0.09亿kWh,较好实现洪水资源化利用。此外,本研究方法科学合理,可为类似具备调节能力的水库的运行管理提供可靠借鉴。

In order to improve the flood control capacity of cascade reservoirs in the Dadu River Basin,Dagangshan Reservoir is considered as the main study object to analyze the problems of the current reservoir operation mode.After setting up different inflow scenarios,and analyzing the flood control capacity of cascade reservoirs,the hydrometeorological forecast accuracy of Dagangshan Reservoir,and the safe discharge of the downstream channel,the cascade flood routing algorithm and the improved pre-discharge capacity constraint method are respectively used to study the flood control operation index of Dagangshan Reservoir under the condition of cascade joint operation and the dynamic operation index under the condition of small inflow,based on which the Dagangshan reservoir operation scheme in the flood season can be formulated.According to the flood routing calculation based on the typical flood process,the flood-peak discharge can be reduced by 530 m^(3)/s when the inflow of Dagangshan Reservoir is large,which can reduce the flood control pressure of downstream section;when the inflow is small,the economic benefit of the Dagangshan Reservoir can increase by 6~9 million kWh based on the premise of ensuring its own safety,which improves the utilization of flood resources.In addition,due to scientific nature and rationality,the research method can provide reliable reference for the operation and management of reservoirs with similar regulation capacity.