基于双层优化的西北干旱灌区水库群联合调度OA

[Objective]There are significant differences between source reservoirs and receiving reservoirs in arid regions of Northwest China in terms of spatial distribution and functional positioning.Traditional single-level opera-tion models are difficult to achieve the global optimal allocation of water resources.To improve the scientific basis of reservoir operation and the efficiency of intensive water resources utilization,this study constructs a joint operation model for reservoir groups based on bi-level optimization.[Methods]A bi-level optimization model was established for the joint operation of reservoir groups,and the particle swarm optimization(PSO)algorithm was used to solve the model.The upper-level model takes the source reservoir as the operation core and aims to minimize water trans-fer deviation and evaporation-seepage losses.The lower-level model takes the receiving reservoirs as the regulation objects and aims to minimize water shortage in irrigation districts.Hydrological methods were used to quantitatively evaluate ecological flow,which was incorporated into the operation model as a rigid constraint.[Results]The vari-ation trends of water transfer amount and water diversion amount were consistent,and the ratio between them re-mained within the range of 0.87-1.07.The multi-year monthly average evaporation-seepage loss decreased from 413.14× 104 m3 before optimization to 348.46× 104 m3 after optimization,with a reduction of 15.66％.The water supply reliability of each sub-irrigation district reached 87.33％-95.63％.[Conclusions]The proposed reservoir group joint operation model based on bi-level optimization can coordinate the relationship between source reservoir regulation and receiving reservoir water demand,reduce evaporation-seepage losses,and improve irrigation water supply reliability under ecological flow constraints.The research results can provide a reference for the joint opera-tion of reservoir groups in similar regions.