Chemical characteristics and formation mechanism of groundwater in Wei River Basin
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Abstract:
Based on analysing 407 hydro-chemical data and 139 aquifer rock soil samples date of groundwater fromWei River basin, China, the graphical method, mathematical statistics, Gibbs semi-logarithm diagram and phreeqc simulation method were applied to study the chemical characteristics and formation mechanism of groundwater. According to the principle of division of the groundwater system, the study area can be divided into five secondary groundwater system, namely, Longxi Loess Plateau subsystem, Longdong Loess Plateau subsystem, Shanbei Loess Plateau subsystem, Guanzhong basin Loess Plateau subsystem and Qingling mountains subsystem. The hydro-chemical type of the groundwater in the Wei River basin mainly HCO3-Ca and HCO3-Na, in northern and central there is also distributed HCO3.SO4-Na, HCO3.SO4.Cl-Na, SO4.Cl.HCO3-Na and Cl.SO4-Na type water, most areas groundwater TDS is less than 1g/L of fresh water. the formation of the chemical composition of groundwater were impacted by aquifer mineral dissolution/ precipitation, evaporation concentration and cation exchange.
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