Abstract
Phreatic is an important water resource for human survival and development. With the process of urbanization, diving in many areas has been polluted to varying degrees. In order to find out the existing relationship between phreatic level and water quality, in this study, 53 Wells in the main urban area of Xi’an in 2017 were selected to map and analyze the submersible water level, and the improved fuzzy comprehensive evaluation was used to evaluate the submersible water quality. The results show that the change of phreatic level is closely related to the fluctuation of terrain. The improved fuzzy comprehensive evaluation method can well reflect the phreatic quality in the study area, and it is universal. There is a linear relationship between phreatic level and water quality. Due to the flow in phreatic water, the polluted phreatic in the upstream will pollute it in the downstream. This is also the reason why the water quality along the Weihe River is poor. This study has positive significance for the good development of phreatic protection and the construction of human life in the study area.
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