Study On Water Flow Linkage Mechanism Of Regulated Engineering Groups In Water Transfer Projects

The serious shortage of water resources and the increasingly sharp contradiction between supply and demand in some areas,which caused by the uneven spatial and temporal distribution of water resources,have become a bottleneck restricting China's economic and social development.China has built a number of water transfer projects to solve these issues.The water transfer project can solve the problem of shortage of water resources in the intake area,but also changes the water regime of the intake area,which breaks the balance of the original water system and coexists with the local water sources.Therefore,it is very important to explore the linkage effect of regulated engineering groups in water diversion project,which is of great significance to enhance the water transfer efficiency and reduce the water transfer cost.Based on the distribution characteristics of the canals,lakes and reservoirs along the water transfer line,the coupled model of the one-dimensional river network and the two-dimensional lakes in Lunan and Lubei intake areas are established and vertified in this paper.The simulation results of the planning water transfer scheme in Lunan and Lubei intake area are discussed.The relationship and dynamic changes between water level and water quantity of regulated engineerings under the planning water transfer scheme are revealed and clarified.Obtaining the conclusion that the storage capacity of the regulated engineering meets the requirements of planning water transfer scheme and the water quantity and water flow process of water diversion gates meet user water requirements.But also exposing some problems of the planning water transfer scheme in Lunan intake area,such as the low efficiency and high cost of water transfer,low water level of pump stations,and the underutilization of lake storage capacity.In order to solve the problems of the planning water transfer scheme in Lunan intake area,the planning watert ransfer scheme is optimized by shortening the running time of pump stations,delaying the opening time of pump station and making full use of lake storage capacity.The optimal water transfer scheme in Lunan intake area is simulated and analyzed by the coupled model.Under the optimal water transfer scheme in Lunan intake area,the running time of pump stations is greatly shortened,which improves the water transfer efficiency and reduces the cost of water transfer;The minimum water level of pump station is not lower than the corresponding lowest operating water level,which meets the pump station design and safe operation requirements;Nansi Lake reaches its highest water level in the water transfer period and its storage capacity has been fully utilized.The optimal water transfer scheme is of great significance to the dispatching operation and management of the eastern route of South-to-North Water Transfer Project.