Study On Optimaization Operation Methods Of "Single Reservoir-single Pumpstation" And "Reservoirs" In Jiangsu Section Of South-to-North Water Diversion East Route Project

Eastern Route Project is a large-scale inter-basin water diversion project inclouding multiple water sources, multiple users and multiple stages. The project was completed in 2013, and has set up a began of water transfer to the north. Therefore,, how to carry out the study of water resources optimization scheduling of the inter-basin water transfer project using modern decision-making optimization theory and combined with the actual situation will be a very meaningful research subject.At present, the domestic and foreign scholars on water resources optimization operation of inter-basin water transfer project (group) and the reservoir has already done a lot of research, but the models are mostly idealized or revised, besides, the relevant studies adopt few complex system theories. On the basis of related research at home and abroad, this paper carried out researchs on single reservoir, single reservoir with single pump station and reservoirs by taking the Jiangsu section of the first phase of South-to-North Water Diversion East Route Project as the study case, and the following aspects were developed:(1) The paper generalizes the complex Jiangsu section of the first phase of South-to-North Water Diversion East Route Project into a river-lake(reservoir)-pump station(s) system, on the basis, this paper analyzes and calculates the inflow process under the specific frequency of the hongze lake, the luoma lake and the lower lake of nansi lake and the water demand in each hydrological year.(2) On the basis of the analysis and summary of the optimization for the single reservoirs and the pumping station, the optimal operation model for single reservoir and single pump station was constructed and proposed the solving method. Taking the Hongze Lake of South-to-North Water Diversion Project as a study case, the optimal operation model for "single reservoir" was constructed by taking the minimum volume of squares of water shortage(surplus water) in each period as the objective function, the water supply of reservoir as the decision variable, the water balance and the storage capacity of the reservoir as the constraint, and Dynamic Programming method was applied to solve the model above. On the basis of the researchs on "single reservoir"and "single pump station", more theoretical studies will be done combined with complex reservoirs and pump stations.(3) At the pump water under certairt conditions, An optimal operation model for "single reservoir-single pump station" system was constructed by taking the minimum volume of squares of water shortage(surplus water) in each period as the objective function, the water supply of reservoir and the water volume to be pumped as the decision variable, the reservoir storage capacity as the state variable, annual total water supply of reservoir and pump station as the constraint, in addition, the combined operation rule of reservoir and pump station is also considered as the constraint. The Luoma Lake-Zaohe Pump Station section of South-to-North Water Diversion Project is taken as a study case, and is solved by means of DPSA, the results show that the water volume to be pumped can be decreased compared with regular schedule as well as the water shortage and the discarded water in the same water-supply guaranteed rate of 50%,75% and 95% hydrological year. The method can solve the water resources optimization scheduling problem under the condition of total water control for the reservoir and pump station. (4) An optimal water resources operation model for "multireservoir"system was constructedby taking the minimum volume of water shortage in each period as the target, the water supply of reservoir in each period as the decision variable, the water balance and the storage capacity of the reservoir as the constraint, in addition,annual total water supply of reservoir as the constraint. The Hongze Lake-Luoma Lake-the lower lake of Southern Four Lakes section of South-to-North Water Diversion Project is taken as a study case, and the decomposition-dynamic programming aggregation method was applied to solve the model above. With the water supply of each reseevoir as coordinated variable, the model was decomposed into three sub-models of optimal operation for Hongze Lake, Luoma Lake and the lower lake of South Four Lakes. The sub-model took the water supply of reservoir as decision variable, the discrete values of the reservoir storage capacity as state variable.The constructed aggregation model took the water supply of reservoir as decision variable, the discrete values of total water supply of reservoirs as state variable.Both the sub-models and aggregation model were solved by dynamic programming method.The calculation results show that system water supply increased respectively and the water shortage decreased respectively compared with regular schedule in the same water-supply guaranteed rate of 50%,75% and 95% hydrological year.