| Water resources are the foundation of human survival,one of the indispensable basic material needs of human social development,and closely related to all aspects of social and economic development.The development progress of human beings are also accompanied as the improvement of the application of water resources.The way of water use is also developed from the ancient along the water area to build water projects meeting different water demand.Reservoir is the most basic way of water resources use,which often has the function of promoting profits and preventing disasters.In recent years,water ecological problems increase quickly for water shortage,excessive use of water and water pollution.How to realize the reservoir from conventional flood control,profit promotion and other operations to reasonably improve and solve the ecological environment problems around the water domain has become a hot research topic for water conservancy scholars.This paper focuses on the problems of the deterioration of the ecological environment of Baiyangdian and its upstream channels.Based on considering five typical reservoirs comprehensively in the upper reaches of Baiyangdian,the evolution law of the inflow of the reservoir group were analyzed,sorting out the reservoir groups to ensure the surrounding production and domestic water consumption.On the basis of the scheduling rules,ecological water supply constraints are added.Scheduling rules are explored,and genetic algorithm and fuzzy optimization of the scheme are used.As a result,the improvement of the ecological environment of Baiyangdian is shown in this paper.The research work and results of this article are as follows:(1)This research organized the long series of runoff data of the reservoir,analyzed and summarized the the runoff evolution of the reservoir group.An conclusion was shown that the water flow into the reservoir had shown a significant downward trend in recent years.Facing the planning needs of Xiong’an New District under the new situation,with Baiyangdian’s different ecological needs as the goal,two suitable and minimum ecological scenarios were constructed,and the appropriate and minimum ecological water levels corresponding to the appropriate and minimum ecological water levels 7.81m and 6.92m were established 248million m~3 and 151 million m~3 as reference for the joint operation of ecological-oriented reservoir group.(2)In view of the fact that a master-slave hierarchical structure had been clearly shown for the connection of the joint scheduling of Wang Kuai and Xidayang Reservoir,a double-level planning of the reservoirs considering the rules of water supply and water transfer was proposed.The upper level and the lower level are constructed as water transfer rules and the water supply rules.With the model results,the point with the smallest Euclidean distance is regarded as a satisfactory solution for this programming.The scheduling scheme at this point can enable the Wang Kuai-Xidayang joint scheduling to achieve the goals of an balance of ecological water supply,water supply guarantee rate and water diversion Relatively.(3)The method of dividing the dispatch map into different areas by using the reservoir water storage capacity and water supply time was proposed.The optimal dispatch rules for water supply based on the aggregate reservoir were formulated.The joint dispatch model of the reservoir was established,and NSGA-II is used to compute the solution to meet the objective function Pareto solution set.The competitive relationship between the objectives in the decentralization were shown.It was shown that an obvious competitive relationship between the ecological water supply guarantee rate and the agricultural water supply guarantee rate.It was shown that a certain synergy relationship between the agricultural water supply guarantee rate and the comprehensive water shortage rate for the small difference between these two objectives.And there was a certain degree of competition and synergy between the ecological water supply guarantee rate and the comprehensive water shortage rate.With the result,it was impossible for the three objectives getting the optimal solution together.(4)A multi-objective fuzzy optimization method was used to obtain the satisfactory solution from a feasible scheduling scheme,and the 141st solution with a relative membership of 0.605 was selected as the optimal solution.Based on the optimal solution,an optimal scheduling plan was obtained.Three control lines from high to low were set as the agricultural water supply limit line,the ecological water supply limit line,and the urban life limit line.The operation interval of the aggregation reservoir was divided into five water supply decision areas:Area I-normal water supply area;Area II-agricultural water supply restriction area;Area III-ecological water supply restriction area,Area IV-domestic water supply guarantee area,V area-dead storage capacity area.Applying optimized scheduling rules and traditional scheduling applications to long series of measured data,the results show that the scheduling rules obtained through optimized scheduling are reasonable and suitable for scheduling needs,which can meet the suitable ecological water consumption in the normal water year and the minimum ecological water consumption in the dry water year.Provides reference for the optimal operation of ecological-oriented reservoir group. |
