Research On The Risk Of Assessment Of Changchun Water Supply System

The city water supply is an important part of the city infrastructure.its safety has direct impact on the city development level. of water shortage and pollution is more and more serious . It could not be as urbanization is speeding up ,especially when the situation of water shortage and pollution is more and more serious.Today, any significant unexpected events will cause a certain political influence and economic losses. To ensure that urban construction and development of the match, and the coordination of social and economic sustainable development, and constantly improve the living standards of people suited to the urban water supply system, we must effectively protect urban water supply safety. The history of China's city water supply has nearly 100 years, along with economic development, it has achieved great progress in recent years, but as China's urbanization strategy speed up, the shortage of water resources, especially sudden water pollution,which make the safeguarding water supply safety more and more difficulty. city water supply security issues have become prominent. Its Defects mainly include: shortage of water resources, serious water pollution, improper water conservation, water supply networks and its ancillary equipment facilities, emergency response capacity weak and so on.The development of urban water supply, not only limited by water, topography, geology and other natural hydrological conditions of the restrictions, but also by the economic and social development level of the city, and also by government funding, and management techniques and so on. poor quality of water resources, the aging water supply facilities, water pollution and the destruction of city water supply are the most important factor in security, at the same time oversight mechanisms and incident handling level of the city have direct impact on the extent of harm caused by unexpected incidents.Changchun is the capital of Jilin Province, and it is the centre of politic, economic, education, scientific, technological and culture. Since the founding of China, Changchun City water supply has made remarkable achievements, however, as a dry city, the city water supply is a threat to the economic development in Changchun, water supply has the impact on industrial output value reached 200 billion yuan. In the respect of water supply, mainly the following issues: water shortage, the per capita share of the national per capita less than 1 / 6, although the second Songhua River temporarily eased the tense situation of water resources in the city, but the long-term water supply is still inadequate, and Shuangyang Has over-exploited groundwater, the groundwater within the city alone as a water supply source, the district has failed to meet the development requirements; uneven distribution of water resources in time and space; water pollution levels increased, a large number of untreated sewage directly into the waters, The river polluted. "Reply-to-long" works as the city's main water source, " Second Songhua River " project reduce the safety factors for the dependence on Second Songhua River; About half of the water supply pipeline was built in the 1930s, most of them are Mexican cast iron pipe, due to the aging water pipes, pipe scaling, corrosion serious, some existing pipelines running, drop, the floor, and other phenomenon, make the economic Losses. In addition, there is four Water purification plants in Changchun a total of four water purification plants, three in the east, a direct result of overloading of water trunk mains, excessive flow of the pipeline, network terminal water pressure lower, as a result the western part of Block serious lack of water supply.This paper is mainly composed of three parts. The first part is the first two chapters, chapter 1, introduced the main topics of this background, research and the significance of the status quo at home and abroad, the second chapter, introduced the risk assessment , and fuzzy comprehensive evaluation of the risk assessment of city water supply system. Part II is divided into three, four chapters, mainly on the status of the water supply system in Changchun and identify risk factors , finally the establishment of evaluation system for the use of fuzzy comprehensive evaluation methods of evaluation; Part III is divided into five, six chapters, mainly against the status of Changchun City water supply system make recommendations,the final conclusions and prospects for the part. Specific sections are as follows:ChapterⅠ,outlined the background, the significance, the content, the methods of research.ChapterⅡ, risk assessment theory and its application in the water supply system. introduce the risk and the basic principles of risk assessment, reviewed and risk assessment. Second ,the risk evaluation method. finally ,apply fuzzy comprehensive evaluation methods for water supply system risk assessment.Chapter III, status of Changchun City water supply. First of all , China's present situation and development of city water supply, the Changchun City water supply system components are water, city water supply networks, water purification plants and ancillary facilities as well as user four parts. Second Changchun City from the river water, precipitation resources, urban water consumption, water supply and water pollution situation in five small areas of the city of Changchun, the status quo and the use of water resources profile introduction. Finally, water resources, pipeline network, water purification plants on the three most important aspects of the status quo in Changchun City water supply was more details.Chapter IV, Changchun City water supply system risk assessment. First, from the water source areas, water pipe network links, water treatment areas and the management of security risk identified four areas, affecting the water supply system to identify safe operation of the main factors, and then consider the establishment of comprehensive evaluation index system, according to final The establishment of the indicator system-level analysis and the use of fuzzy comprehensive evaluation method of combining the Changchun City's water supply system to evaluate and finally come to the current water supply system in Changchun City in the middle level of risk.Chapter V, regard to the main contradiction and issues related to urban water supply,comprensive investigation is made on water sources ,water quality ,pipe networks and facilities.targets and measures for sucuring urban water supply are put forward., and making contingency plans based on past experience of the accident.Chapter VI, conclusions and prospects. Mainly to the defects of the paper and the next step of research.