Assessment Of Groundwater Vulnerability In Dalian City

Dalian is an acute water shortage city, water resources the average per person amount insufficient less than 1/4 of china, the ground water resources` supply and demand contradictory and the increasingly serious pollution problems, which is enhanced by the pollution of groundwater and necessity of assessment of vulnerability, regarding the ground water easy comparison of contaminated area, to carry on the science reasonable and rational layout, enhances public awareness of the protection of groundwater pollution, setting up guards against the primarily thought.Evaluation of groundwater pollution is prone to rational utilization of the development of groundwater resources, is an important basis for the protection of groundwater resources. Although both domestic and foreign e-polluting groundwater study did a lot of work but still have a lot of problems to be resolved.Because of natural conditions and hydrogeological conditions and situation of the country and abroad is not entirely consistent in china, so our research cannot be lifted from the foreign experience, should be used in combination.This paper in refers to in each kind of advanced theory achievement foundation, has constructed the appraisal target system according to Dalian's concrete condition, has established the easy polluting evaluation criteria, and used DRASTIC method based on the AHP, the collection to the analysis method, the fuzzy pattern recognition theory to carry on the appraisal to the ground water easy polluting, has obtained the more scientific appraisal result.The full paper is divided into five parts, the first chapter introduced the selected topic goal and the significance of the subject, this article research content and the research technique, and research history that the ground water is easy polluted question, the present situation and the existence question have carried on the key elaboration. Second chapter to studies the area the physical geography and the social economy survey gives the introduction, and has analyzed the water resources development use present situation. Third chapter introduced with emphasis the research area geology and the hydro-geological conditions, including the stratum, the geologic structure, the ground water type, the ground water tax save the characteristic and the ground water military supplies runoff excretion condition. Fourth chapter introduced at present applies the most widespread ground water easy polluting appraisal model-DRASTIC model, analyzes its existence the question and has the reason, discussed the fuzziness which in the ground water easy polluting and the appraisal exists, introduced DRASTIC method based on the AHP, the collection to the analysis method, the fuzzy pattern recognition theoretical model, and separately using the DRASTIC model, DRASTIC method based on the AHP, set pair analysis method, the fuzzy pattern recognition theoretical model to studied the area ground water easy pollution and maked the appraisal. Fifth chapter, introduced what the paper haved done and drew a conclusion.