Characteristics Of Groundwater Chemistry And Hydrogeochemical Process On Shijiazhuang-Hengshui Profile

Groundwater is an important water resource for industrial and agricultural production and domestic water in Shijiazhuang and Hengshui districts.Influenced by nature and human activities,the groundwater chemical environment has changed,threatening the domestic water safety and limiting the use of groundwater.Therefore,studying on the groundwater chemical characters and evolution in Shijiazhuang and Hengshui is of high importance for rational development,utilization and protection of groundwater resource.Based on the project of “Beijing-Tianjin-Hebei region geological environment comprehensive monitoring”,This paper chose Shijiazhuang-Hengshui profile of Quaternary as the research object,and systematically studied on the water chemical compositions in four aquifers in Quaternary,and used Piper chart to analysis of groundwater chemical characteristics,used the improved Nemerow index method to evaluate the groundwater quality,used ion ratio and different ion related diagrams to study the process of groundwater chemical composition,used PHREEQC to simulate the interaction of water and rock in different aquifers,the main conclusions are as follows:?1?The analysis of Piper charts shows that the groundwater chemical character has zonation patterns in horizontal direction,from piedmont plain to the central plains the hydrochemical types in the ?,? aquifers are HCO₃-Ca·Mg,HCO₃·Cl-Ca·Mg to Cl·SO₄-Na·Ca,Cl·SO₄-Na·Mg,and the ??? aquifers are HCO₃-Ca·Mg,HCO₃-Na·Ca to Cl·SO₄-Na,Cl·HCO₃-Na??2?Water quality evaluation shows that the groundwater quality of the ? and ? aquifers is poor,while the water quality of the ? and ? aquifers is good,The water samples that conform to the ? class national drinking water standard account for 50%,66.7%,90.5% and 81.8% in each aquifer.?3?The ion ratio analysis shows that from west to east groundwater dynamic conditions has a clear zonality,from the piedmont plain to the central plains the hydrodynamic interaction decreases gradually,and decreases with depth;Cation exchange adsorption enhances gradually,and also increases with depth.Ion components of groundwater mainly comes from halite,carbonate rock and sulfate salt rocks and silicate rock.?4?The simulation calculation and analysis show that the groundwater chemistry in Shijiazhuang and Hengshui area is mostly affected by leaching,evaporation,cation exchange adsorption,oxidation-reduction and human's activities.The results of inverse modeling simulations show that the main hygrogeochemical process in the ? and ? aquifers are evaporation concentration,leaching and the alternate adsorption successively,The main hygrogeochemical process in the ? and ? aquifers are leaching and cationic alternation adsorption.