Study on Derivation of Multilevel Operation Chart for Multi-year Regulation and Multi-purpose Reservoir
For multi-purpose reservoir of multi-year regulation,multilevel operation rule curves should be derived considering the inflow runoff and different tasks.An improved typical hydrological year method was proposed to derive the multilevel operation chart of multi-year regulating reservoir.Considering various design dependability and annual guaranteed water supply process of each task,the integrated water supply was graded accordingly for different hydrologi-cal years.The integrated water supply process and annual supply amount can be obtained according to the proposed re-duction factors for different hydrological year.Based on the long-term historical runoff data,typical hydrological years were selected according to the annual water supply amount correspondingly.The water supply process was compared with the runoff process of typical hydrological year and the reservoir storage capacity change process was derived correspond-ingly.According to storage capacity change characteristics of multi-year regulation reservoir,different operation rule curve should be derived by different initial reservoir level.The reservoir storage capacity change of typical hydrological years selected for upper operation rule curve derivation was analyzed from the end of water storage period when the reser-voir storage capacity was at the normal water level.The analysis for lower operation rule curve and the operation rule curve of continuous dry year was carried out from the end of water supply period when the reservoir storage capacity was at the dead water level.Drawing the upper envelope curve of the reservoir storage capacity change curves corresponding to the typical years,the upper operation curve was obtained.Taking the lower envelope curve of the reservoir storage capac-ity change curves corresponding to the typical years,the lower operation curve and the operation curve for continuous dry year can be obtained.By calculating the demarcating reservoir storage capacity,the dividing operation curve between dif-ferent tasks can be determined to coordinate different water supply tasks.By synthesizing these four operation curves,the multilevel operation chart for multipurpose reservoirs of multi-year regulation was derived.According to the statistical re-sult of the scheduling calculation,the operation chart can meet the design dependability of each task.A multilevel opera-tion chart can effectively guide the operation of reservoir and improve the efficiency of multi-purpose reservoir.
NETL
NSTL
万方数据
维普
