Research On Multi-Objective Control Regulation And Risk Decision Of Flow And Sediment In Xiluodu Reservoir

Xiluodu reservoir,located in the Jinsha River basin,is China's second largest hydropower station.Its annual average generating capacity is 57.12 billion KW·h and the average suspended sediment load at the dam site is 247 million tons.Sedimentation problem exists in the operation of Xiluodu reservoir.While the uncertainty of water and sediment will bring risks to the operation of Xiluodu reservoir.Therefore,it is necessary to study the joint regulation of reservoir water and sediment and its risk in Xiluodu reservoir.This paper mainly studied the multi-objective regulation and risk decision-making of water and sediment in Xiluodu reservoir.Firstly,the latest development and the existing problems of the research on reservoir sediment erosion and deposition,joint optimization operation of water and sediment and multi-objective risk decision-making have been summarized,and the main study of this paper was proposed.Secondly,the objectives of water and sediment joint operation were analyzed,and the maximum power generation and minimum sediment deposition were selected as the main objectives,the other objectives was convert into constraint condition.A multi-objective regulation model of water and sediment in reservoir were developed by integrating one-dimensional sediment model and reservoir operation model,and the multi-objective dynamic programming iterative algorithm was used to get Pareto solutions.Thirdly,the model was applied to the water and sediment regulation in Xiluodu reservoir,and Pareto solutions of power generation and sediment deposition were calculated.Finally,considering the uncertainty of the inflow and sediment concentration,Monte Carlo method was used to calculate study the objectives and its risk of water and sediment operation of Xiluodu reservoir.The fuzzy optimum selection theory based on the combined weights was used to make the risk decision for Pareto solutions,and the optimal equilibrium solution was given.The results show that the proposed model and method could effectively coordinate the contradiction between power generation and sediment deposition during reservoir operation.It reveals the impact of the uncertainty the inflow and sediment concentration on power generation and sediment deposition.This research could provide technical support for Xiluodu reservoir multi-objective regulation and risk management.