| Water is the source of all life on earth, is the survival environment factor, but also is an important material resources for the development of human society. Population growth and economic development are increasingly demand for water resources,But the limited water resources can not meet the the rapid growth of domestic and production water demand. At the same time as the irrational use of water resources, supply and demand stress, frequent flood and drought and ever-worsening environment has emerged. In view of the water resources'problem in China, it is particularly important to comprehensively utilize and reasonably allocate the water resources, especially the available non-conventional water resources in the cold, drought and water shortage city in northern China. Based on the Xilinhot, Inner Mongolia, as the research area, be aimed at the now appears water shortage problem, based on the characteristics of water sources and water consumers, systematicly and comprehensively evaluate this city's surface water, groundwater, opencast coal mine drainage water, reclaimed water and urban rain water, meanwhile, researching on the simulation, optimization and simulation and optimization coupling about the allocation between the water and the water using departments, and eventually get to balance between economic, social and ecological benefits of the optimal solution. The main research contents below:(1) Posing problem. This paper summarizes the main contents of theoretical research and development direction about water resources reasonable allocation at home and abroad; poses the main problems which the water resources and the economic, social and ecological environment problems are facing, and chooses the drought and water shortage city in northern china as research area.(2) Water resources evaluation on research area. This paper gives a detailed description about the economic development status, urban water supply and demand condition, far-seeing plan and the water resources development and utilization, combines existing materials to do the quantitive and qualitive evaluation of Xilinhot's five water resources which are surface water, groundwater, opencast coal mine drainage water, reclaimed water and urban rain water.(3) System dynamics simulation of multi-source water resources comlex system in research area. Proposing that regional multi-source water resources complex system is the development of S-type, Logistic growth model can be described as the process of sustainable development. System dynamics analysis is applicated to investigate, analyze and simulate the multi-source water resources system in the structure and the dynamic behaviors of the development and motion. The multi-source water resources complex system in Xilinhot is divided into agriculture, industry, tertiary industry, domestic and greenland water consume system. All kinds of changes in this system is simulated, so as to find the methods and opportunities to improve the city water system behaviours, and achieve the goals that optimizing water resources planning and management of technical operations to promote local water resources, population, social, economic and environment under coordinated and sustainable development.(4) Studing on multi-source water resources reasonable allocation inresearch area. Social, economic and ecological multi-objective optimization model in Xilinhot is built, and the output of supplying water, maximum water supply to the consumers and the variables be positive are considered as the constraint conditions of the model, by means of the nondominated sorting genetic algorithm (NSGA-â…¡) to allocate the water resources between each water consumers in Xilinhot, and get the Pareto optimal solutions for different water supply of water using departments.(5) Case studing on water conservancy project. The optimized configuration is applied to the multi-source water resources industrial water supply project, by using the engineering example to illustrate the practical significance of local multi-source water resources reasonable allocation.(6) Coupling of optimization and simulation. This pater applicate the method of decision support the thought and coupling of optimization and simulation to analyze the multi-source water resources complex system in Xilinhot integrally and wavily. Firstly, optimization is applied to find the system optimal tactics in the planning period, secondly, dynamic simulation is applied on detailed analyzing to obtained the corresponding indexes. Combining and feedingback with the optimization and simulation, can guide decision approach to the optimal, reasonable and feasible destination.Finally, the study contents are summarized, and the future research contents and development direction are forecasted in this paper.
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