关键词: 浅层地下水, 水化学特征, 水文地质

Abstract: Shallow groundwater in Maanshan City，Anhui Province has been polluted to a certain ex⁃ tent，but its hydrochemical characteristics and influencing factors have not been effectively revealed. There⁃ fore，based on the analysis of the chemical characteristics of shallow groundwater in Ma 'anshan City，the hydrochemical characteristics and influencing factors of shallow groundwater in the study area were re⁃ vealed by mathematical analysis，sensitivity analysis，principal component analysis and cluster analysis. The results show that the chemical type of shallow groundwater in the study area is mainly HCO₃-Ca type ; the relative range of Mn，Fe，Al，NH⁴⁺，Zn，F^-，NO^2- was 11.89~39.62，and the coefficient of variation was 127.25~457.06. The highest degree of dispersion and the strongest volatility showed that the above indi⁃ cators were susceptible to mining，aquaculture and other human activities. The overall quality of groundwa⁃ ter in the city is in good condition，and is greatly affected by human factors. The groundwater quality of Washan mining area is poor，mainly affected by mining activities，aquaculture in southern Shijiu Lake and Guxi River also affected groundwater quality to some extent.

Key words: shallow ground water, hydrochemical characteristics, hydrogeology