Analysis on hydrochemical characteristics of groundwater in strongly exploited area in Hutuo River Plain

The Hutuo River alluvial-proluvial fan is located in North China Plain, and groundwater is the main source of water supply for agriculture and domestic water. Shijiazhuang depression funnels due to the long-term excessive exploitation are the bottleneck of the regional economic development. Analyzing the chemical characteristics of groundwater under the condition of strong human activities, can provide a scientific basis for further study of strong groundwater mining area environmental change. 143 groups of shallow groundwater samples are collected during the period of 2007-2008. In this paper, the hydrochemical characteristics of groundwater in the Hutuo River Plain area are analyzed systematically, using hydrogeochemical theory, combined with statistical methods and hydrochemical methods. Results are shown as follows： HCO3-and Ca2~ are major anion and cation. The variation coefficients of K＋, Ca2＋, Mg2＋ and HCO3 between 0.25 and 0.52, which means small and stable relatively. The variation coefficient of are Na~, NO3, CI, SO42 were large （0.89-1.01）. They are sensitive and vulnerable to environmental change affect. Due to the impact of human activities, from the top to the edge of the alluvial-proluvial fan, the hydrochemical types of groundwater change from single to multiple, followed by HCO3-Ca-Mg, HCO3.SO4-Ca.Mg, HCO3.SO4.CI-Ca~Mg, HCO3-CI-Ca~Mg and other types.