Study On The Optimal Allocation Of Water Resources In Kaifeng City

With the rapid increase of population and the quick development of social economy, the water resources situation in our country has changed tremendously. The conflict of water resources shortage is becoming more and more obvious, and the area of water shortage is expanding, and the degree of water shortage is aggravating. Water shortage has become the most serious problem that hinders economic development in many regions, and directly affects the sustainable development of our social economy. Therefore, it is very important to research on the rational water allocation. On the basis of literature review of the related researches domestic and abroad, and summary of the methods and theories of optimal water resources allocation, the main problems in the allocation of water resources are analyzed with the case study of Kaifeng city, one of the water shortage regions in China. Studies on water resources forecasting, optimal allocation water resources among different sectors and different districts and different areas are also conducted. The main contents of this dissertation are as following:1. Systematic analysis of the research status, levels, theoretical methods of water resources forecasting and optimal water allocation in order to establish the theoretical basis for the study of the dissertation.2. Through analyses of the trends in water resources supply and demand, based on the theories of water resources forecasting, the scientific forecasting models on the water supply and requirement at different levels and different years are established. On this, the water resources demand and supply at different level and different years and the water balances in different levels of planed years are analyzed.3. Aimed at the major problems existing in water use and the significance of water resources optimal allocation in Kaifeng City, the methods and models of water resources allocation are proposed based on the theory of optimal allocation of water resources. In the model, the total available water resources quantity is taken as the constraint, and the maximum multi-year averaged net benefit is taken as the objective, and the yearly changing benefit coefficients are studied by using Genetic Algorithm. Through optimization of the benefit coefficients, and use of the results of waterresources forecasting, the water resources are optimal allocated among different sectors at different level and different years in order to realize water resources sustainable utilization.4.Aimed at the objective of high-efficiency use of water resources, the optimal water resources allocation among different irrigation districts and different crops in Kaifeng city are studied. The problems existing in water resources use and potential of high-efficiency use of water resources in the four Yellow River irrigation districts are analyzed. Through analyses of the trends in water resources use, the measures and the routes of the high-efficiency use of the water resources in Kaifeng city are proposed, and a large scale system decomposition-coordination model which allocate waters among the four Yellow River irrigation districts as well as optimal crop patterns in every irrigation district is established. Water resources optimal allocations among the different irrigation districts and different crops are studied.5. Finally, the water resources optimal allocation results are summarized and the perspective studies in the future are put forward.