大中型水库生态流量核定与优化调度研究OA

Currently,the determination of ecological flow for large and medium-sized reservoirs only involves repetitive calculations using multiple methods,without sufficient consideration of the rationality and regional coordination of ecological flow target setting.To further improve the working path and technical methods for the determination of ecological flow in large and medium-sized reservoirs,the Shunxi Reservoir in Pingyang County,Zhejiang Province is taken as an example,and a method for rechecking and arguing the ecological flow target is proposed based on supply and demand balance analysis.After fully generalizing the water resources system of the reservoir,the ecological flow of the reservoir is initially calculated using multiple methods.Based on the principle of water resources supply and demand balance,the coordination between ecological flow targets calculated by each method and existing water supply tasks of reservoir is analyzed.Finally,the ecological flow target of the reservoir is comprehensively determined,and a multi-objective optimal scheduling study of the reservoir is carried out to coordinate the water supply for various water users.The results show that after taking into account the water supply tasks of urban and rural life,industrial production,and agricultural irrigation,the ecological flow target of the Shunxi Reservoir is determined to be 0.46 m3/s.Based on the determination result,a multi-objective optimal scheduling model for the ecological flow of the Shunxi Reservoir is constructed,and the scheduling lines for urban and rural water supply,ecological flow,and irrigation water supply are proposed.The annual guarantee rates of the three industries are 95.3%,91.1%and 86.4%,respectively,and the annual water shortage is reduced by 2.09 million m3.The results show that there are many methods for calculating ecological flow at present,and there are differences among the calculation results of each method.For the selection of the ecological flow determination target of large and medium-sized reservoirs,it should be the result of the coordinated allocation of various water users.Under the condition of fully ensuring urban and rural water supply,the ecological flow target should be comprehensively determined to achieve harmony between humans and water.The research results provide a systematic method and practical case for the determination of ecological flow in large and medium-sized reservoirs,and also provide a scientific basis for the dispatching and management of the Shunxi Reservoir.