The Study On Disposition Of Water Resources Based On Sustainable Development In Changchun City

The growing water crisis in Changchun City has become one of the important factors in national economic development. How to solve the contradiction between supply and demand of water resources, make the most economical use,environmental benefit and social benefits of limited water resources,how to maintain the sustainable development of water resources are urgently needed to solve.The existing capacity of 148 million tons per day of raw water sources in Changchun city center,system water supply capacity of 10.37 million tons, a total of four water purification plants in city center,total design capacity of 1.02 million m3/d,and average daily volume of 698,000 m3 of water.The original require of 270 million m3 of water,739,700 m3 average daily water demand.Growth of consumption by 2002, factors to consider water conservation and water-supply capacity can be maintained to the existing projections for 2008-2009,should be early planning ahead building,the ability to maintain existing sources of raw water for 2013. The increasingly severe and highly integrated water in Changchun City, rational allocation of water resources is the reality of necessity and urgency.Through the development and utilization of water resources and socio- economic development trend analysis,draw water supply situation in Changchun City,in the use of the situation completely under water capacity ,the annual production will be able to meet the demands of living and water demand.However, the water supply capacity is more than 50% of inter-basin water transfer,from the water supply costs, it is extremely unreasonable ,so we should try to reduce inter-basin water transfer ,best sought from the systemitself solve the problem of water scarcity,the economic and social environment in order to achieve optimal efficiency .Using system dynamics of the distribution of water resources in Changchun City ,system dynamics is a highly nonlinear,higher-order,multivariable, multiple feedback subject for research to change the system at the complex .This paper presents a mathematical model of the open systems standard for qualitative and quantitative analysis of functional and structural simulation. Analysis of the water resources system in Changchun City, focusing on water supply and demand balance model and consider the situation of water resources. First water system to determine the boundary study the structure of water system ,central compiled causal relationship,transformed into the feedback system dynamics flow chart ,explicitly state decision parameters, and then quantified, write equations.Through these steps to establish the Changchun urban water system dynamics flow diagram ,general system of feedback mechanisms to balance supply and demand for water allocation is the core,it is a link between water pressure.Changchun City is a major industrial water, life and environment composed of water,and the water would come from existing water and inter-basin water transfer .The basic theory under the water allocation, system dynamics software used VENSIM, balance of supply and demand of water resources in the core, as a link to water saving, in ecology, production, life prerequisite for water efficiency, set up five distribution program application to establish the Changchun municipal water distribution system dynamics model of water resources in Changchun City of the simulation program.In order to choose the best project, the establishment of a system ofindicators of water resources options, indicator system includes inter-basin water transfer rate,the rate of water reuse rate,industrial output million water,urban water ration,woodland irrigation ration,turf irrigation ration,water lakes ration,seven indicators need to reflect the social,economic and environmental benefits of development and utilization of water resources. Use TOPSIS evaluation model, in accordance with the evaluation system, evaluation of system dynamics simulation results.After analysis of the simulation results, the fifth project is optimization, and the third project,the second project,the fourth project,the first project.The fifth project is appropriate for the water saving, to strengthen water reusing and the inter-basin water transfer for less than the amount of water.Inter-basin water transfer to the 2020 rate of 22%, water reuse rate of 30%, urban water quota for 233L/ (person? d), lawn irrigation for 0.352 million m3/hm2,woodland irrigation quota for 0.149 million m3/hm2, water lakes quota for 0.862 million m3/hm2, the consumption of industrial output is 12.418m3/million, industrial water recycle rate of 75.3%.The third project is the large number of water-saving program under the premise of maintaining the same amount of water reuse, the remaining water, to solve the inter-basin water transfer .When 2020, the diversion rate of 40%. This project used to waste a lot of water reusing resources, increasing the cost of preventing pollution,increasing the inter-basin transfer of water, raising the cost of supplying water. However, due to extensive water saving, thus make water reducing, the water supply to lower costs, and saving a lot of the raw water, reducing water pressure.The second project under the premise of making full use of local waterresources, adopted water saving measure vigorously , increased water reuse, recycling rate of 30%, the industrial output value of water reduced to 10m3/ million, life water ration to 220L/ (person? d) , urban water still exist in a state of partial defect, to make achieve the balance of supply and demand of water resources, water conservation measures must be taken further, or lower industrial output, adjust the industrial structure. This project expected contradictions water conditioning inside system, but for a shortage of bulk water system itself, it is impossible to fundamentally solve the problem.The fourth project ensures normal growth in the demand for water infrastructure, continuously improving the amount of water reuse, water recycling rate of 30%, the adequacy of inter-basin transfer of water from the Songhua River, the water rate of 50%, the project used the existing water, the water was extensive use, led to widespread waste water.The increase in water consumption has led to a sewage treatment, increased pollution control costs is likely to lead to water pollution.The first project used cities normal water supply capacity and demand, and will not adopt any water conservation measures, not increase the rate of water reuse, when inter-basin water non-transfer, the gap in the balance of water supply in cities. Obviously, did not take any steps in the circumstances, with the growth of population, the per capita water quota increase, the industrial output continued to increase, growing water demand of ecological environment in urban water demand will show substantial growth, and the slower growth rate of the water supply capacity and can not meet the demand of the corresponding. Therefore, this project is not desirable, the main purpose of this project is to clear water conditions for the normal water level program, to address thescarcity of water and provide a basis for comparison as a reference.The study pointed out the direction of sustainable use of water resources in the region, due to increased water use, industrial water and the water is particularly appropriate inter-basin water transfer, sustainable development in the region is a very important reference value.In addition, the paper also discussed measures on the implementation of the project, including water pollution control program, the protection of water resources, adjustment of the industrial structure and water management information systems, etc. Through comprehensive scientific and rational allocation and management of water resources, Changchun municipal level will greatly improve the sustainable use of water resources.