Water quantity dispatch of Jiangsu Province's Water Diversion from the Yangtze River to the North
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Abstract:
Jiangsu Province's Water Diversion from the Yangtze River to the North, which integrates the Yangtze River, Hongze Lake, and Luoma Lake as its main water sources, constitutes a water network system in Jiangsu Province along with the Eastern Route of South-to-North Water Transfers Project Phase I. Jiangsu Province's Water Diversion from the Yangtze River to the North has made great contributions to the economic and social development of northern Jiangsu Province; however, there are shortcomings in the current operation status of the project, such as high operating costs and large lake abandoned water volume. Therefore, the use of this study is intended as a model to construct the annual water dispatching of Jiangsu Province's Water Diversion from the Yangtze River to the North, starting from the Yangtze River and using Hongze Lake and Luoma Lake as the main control points to form a dual-line water conveyance topology structure of canal lines and west-to-east lines, and generalizes the water use units. Taking the water delivery capacity of each pump station, lake water levels, and reservoir capacity as constraints, and the water supply deficit, water inflow and outflow to Luoma Lake, and water inflow to Hongze Lake as decision variables, the objective function is to minimize the water supply deficit, optimize the ecological water level of the lake, and minimize the operating cost of the pump station. Using rule-based scheduling and stepwise optimization algorithms, as well as the method of target priority, the multi-objective problem is transformed into a single-objective problem. Starting from the end of the project hub (Linjiaba pump station and Taierzhuang pump station), it is solved in reverse order to the starting point hub (Baoying pump station and Jiangdu pump station) of the project, the results of the water dispatching scheme are obtained. For three typical years of high, normal, and low waterflow, a joint dispatching scheme for the gate pump-lake system was formulated to verify the rationality of the model. Further analysis of the lake regulation and storage process, engineering benefits, and engineering characteristics of each scheme was conducted, and scenarios of high water levels with low water use were analyzed. The following conclusions were drawn: First, the storage capacity of Luoma Lake is small, and the water level fluctuates frequently during the water transfer operation period. The Zhongyun Canal pumping station also frequently opens the lake for replenishment, and it is easy to reach the upper limit of water transfer capacity. Secondly, appropriately reducing the water level of Hongze Lake can fully utilize the surplus water in the lake and reduce the cost of water transfer. Thirdly, completely prohibiting the use of water from the high cascade of Luoma Lake for the low cascade will increase the operational burden of water supply tasks for the cascade lines below Hongze Lake, while also increasing the amount of abandoned water in Luoma Lake. Allowing high water for low use can appropriately reduce costs and pumping tasks for pump stations.However, due to the limitations of the rules, significant water abandonment in Luoma Lake results from insufficient joint dispatching between Hongze Lake and Luoma Lake. Optimizing and breaking the rules to find the optimal water supplement mechanism, optimizing collaborative dispatching between upstream and downstream lakes, maintaining stable water levels, and making engineering operations safer and more reliable are areas that require further research in the field of water resource dispatching for the Jiangsu Provincial Water Transfer Project. In summary, the research results can provide certain reference value for the scheduling and operation of the Water Diversion from the Yangtze River to the North.
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