Study On Evaluation And Designing Of Green Water Resource

Clean, safe and high quality drinking water is objective of modern urban development. Traditional access to river water as urban water supply can not meet the needs of urban development. Constructing reservoirs and protecting water quality has become an important part of urban water conservancy. In current society in the pursuit of high-quality, people are increasingly concerned about drinking water quality and requirements for drinking water quality are getting higher and higher. Therefore, designing of green water resource system on the basis of green water resource evaluation has become necessary. In this paper, took Jianyu reservoir in Weinan city of Shaanxi province as an example, evaluated water quality security, water quantity security and ecological security, studied methods of function zoning and measures to protect source water area. The main contents of this paper summarized as following:1) Researching the theories about designing of g green water resource systemically after describing relevant concept. These theories supported the establishment of evaluation index system and laid the foundation for evaluating green water resource scientifically and fairly.Then, narrating the methods of drinking water protection zoning and water function zoning, which conducive to the zonal implementation of protection measures.Finally, expounding the theory of sustainable development aims to achieve long-term sustainable development of source water area.2) On the basis of analyzing current security evaluation index system and definiting the principle of establishing evaluation index system, analyzing comprehensively factors that affect the water quality safety, water quantity safety and ecological safety through consulting document and expert, questionnaire method, etc. Moreover, revealing the meaning and evaluation method of individual indicators. Finally, establishing a framework of comprehensive evaluation index system of green water resource.3) Evaluating water quality safety by the method of synthetical index method written in the evaluation methods towards drinking water head sites safety in national urban cities. Attaching full weight to the worst project of the individual indicators in water safety evaluation. Using PSR model to establish an ecological security evaluation index system through consulting document and expert meanwhile monitoring technological standards and actual situation of Jianyu reservoir. Finally, evaluating ecological security by the method of synthetical index method.4) Taking Jianyu reservoir as an example and obtaining evaluation results as following: Jianyu reservoir's membership of two degree water quality standards is the highest (0.647). On the whole, the water quality is during one and two degree and is in good condition. Water quantity safety index of Jianyu reservoir is five, thus the water quantity is unsafe.The comprehensive evaluation value of ecological security is 0.814, belonging to relatively safer level. The value of the pressure system, the state system and the response system is 0.897, 0.773 and 0.775 which all belong to relatively safer level. But, security index value of the state system and response system are close to unsafe degree. Therefore, Jianyu reservoir's unsafe condition is mainly caused by the state and the response system.5) Taking functional zoning measures in green water engineering system:â‘ In the designing of upstream dam system, following the concept of protection, that is, no tourism projects, implementing soil and water conservation, water resources conservation, ecological migration, green barrier engineering.â‘¡In the designing of dam system, mainly highlighting safety, advertorial and decorative.â‘¢In the designing of downstream dam system, highlighting the ecological landscape, leisure, culture, science and education functions. Promoting the construction of green water resource through designing of the functional areas and implementing of supporting measures.In the end, summarizing textual works and research findings systematically, meanwhile putting forward the problems of improving and new direction of technical development.