Research on the Annual Water Dispatch Model of the Yangtze-to-Huaihe River

The project of the Yangtze-to-Huaihe River diversion focuses on urban and rural water supply, taking into both irrigation and water supply as well as improving the ecology of Chaohu Lake. It is a major strategic water resource allocation project across river basins and across provinces. This study used a combination of a simulation model and optimization technology to establish an annual water dispatch model based on the principle of water balance for the Yangtze-to-Huaihe River diversion project and employs genetic algorithms to optimize the proportion of the two-line river diversion for the section of Yangtze River-to-Chao lake. The possible scenarios of the annual water dispatching model were analyzed from two aspects of runoff water condition and water use planning, and typical years scheduling scenarios were established, including short-term planning and long-term planning of low flow years, short-term planning and long-term planning of normal flow years, and short-term planning and long-term planning of high flow years. The annual water dispatch model was used to simulate the annual scheduling schemes for these different scenarios, and the results of water diversion and water supply, divisional scheduling, and lake storage conditions were compared and analyzed for scheduling schemes. The simulation results showed that the water shortage in the near-term planning level year (2030) and the long-term planning level year (2040) was basically zero in the flat water year and the abundant water year, and there was a large water shortage in the dry water year in both the near-term and long-term planning level years, mainly in agriculture. The total amount of water diversions for each typical year in the scheduling scheme was thus significantly reduced compared with that in the design plan. In the far and near future planning, the abandoned water was less in the dry water year and relatively more in the rich water year and the flat water year, and the abandoned water was similar in the two lakes in the flat water year, while the abandoned water mainly occurs in Chaohu Lake in the rich water year. The northern section of the river was the main object of the water supply of the river-supply project, and the supply of this section accounts for about 57% of the total amount in the dry water year, more than 75% of the total amount in the flat water year, and more than 97% of the total amount in the rich water year. From the viewpoint of the whole section of the project, the water supply in the dry water year was the largest, the lake utilization in the flat water year was the largest, and the abandonment rate in the abundant water year is the largest under the near and long term planning. The results of this study can provide a certain foundation and reference value for the construction of project scheduling operation and scheduling system.