Environmental Investigation And Comprehensive Evaluation Of Typical Groundwater Sources In Xingtai City

With the rapid economic and social development,the environment of groundwater sources has become increasingly severe.This paper selects Xingtai City’s groundwater source and its protection area as the research area.Based on the collection of previous results,it analyzes regional geology and hydrogeological conditions,water-bearing rock series and karst development characteristics,combined with hydrogeological survey,environmental survey and groundwater Monitoring data for many years,using fuzzy comprehensive evaluation method to evaluate the environmental conditions of typical groundwater sources,and provide references for the protection and management of groundwater sources.（1）According to the calculation results of groundwater balance,groundwater resources are in positive balance from 2012 to 2019,with an average annual surplus of 0.98m³/s.The karst water flow field has undergone an evolution from a natural state to an artificially disturbed state.Compared with before 2012,the descending funnel has increased,the water level in the center of the funnel is still lower than the water level in the drainage area,and the karst groundwater is generally decreasing.（2）The groundwater quality of Xingtai City was evaluated by single index water quality evaluation method,fuzzy mathematics water quality evaluation method and Nerome water quality evaluation method.The evaluation result was excellent,with a few water points total hardness,sulfate,hexavalent chromium,and nitrate.Exceeded.Since 2005,the overall water quality is between I-III water quality,and the water quality is stable,and the water quality of a few water points is IV-V water.The water chemistry type of groundwater is mainly HCO₃-Ca or HCO₃-Ca·Mg type water.（3）Comprehensive evaluation of pollution source risk based on the hazard of the pollution source and its location of the unsaturated zone and karst water pollution conduction performance,the results show that the pollution risk is low.Among them,there are 24 extremely low-risk sources,accounting for 32.9%;45 low-risk sources,accounting for 61.6%;4 medium-risk sources,accounting for 5.5%;there are no pollution sources with high and above risks.（4）Combined with MATLAB programming,the fuzzy comprehensive evaluation method is used to comprehensively evaluate the environmental conditions of the groundwater sources in Xingtai City.The evaluation results show that the comprehensive environmental quality of the groundwater sources in Xingtai City is good,and water quantity is the key factor affecting the evaluation results.Based on the evaluation,measures and suggestions were put forward to improve and protect the environment of groundwater sources.