Abstract
Shuangliao City is an important part of the Xiliaohe Plain, and one of the most important bases of grain production in the north of China. Therefore, it is important to ascertain the hydrochemical characteristics of groundwater and their causes and evolution laws in the Xiliaohe Plain to provide guidance to agriculture development and ecological improvement. After collection of detailed data and identification of the groundwater flow field, we studied the causes and evolution of the identified hydrochemical types by zone with mathematical statistics, correlation analysis, ion proportional coefficient and other methods. The results show that the concentrations of HCO3-, Cl-, and Na+ are relatively high, and these of Ca2+, Mg2+, SO42-, and NO3- are relatively low. The concentration of TDS increases gradually along the flow direction of groundwater, and TDS is positively correlated to the variation in concentration of Cl-, Na+, Mg2+, and SO42-. Along the flow direction of groundwater, the hydrochemistry of shallow groundwater show the evolution law from HCO3-Ca·Mg to HCO3·Cl-Na·Ca and HCO3·Cl-Na·Mg, and then to Cl·HCO3-Na·Mg. The hydrochemical types are formed mainly due to the mineral dissolution and deposition, and reaction of cation exchange and adsorption in the aquifer, and the hydrogeochemical processes include leaching, evaporation and concentration, and mixing.
Highlights
Shuangliao City is an important part of the Xiliaohe Plain, and one of the most important bases of grain production in the north of China
The hydrochemical characteristics and evolution of groundwater have been an important field of research in evaluating the quality of groundwater resources
The chemical characteristics of groundwater are determined by the sedimentary environment and characteristics of sedimentary combinations of sources, and are affected by natural and human factors such as flood, ecological water transfer, agricultural irrigation[2,3,4,5]
Summary
Shuangliao City is an important part of the Xiliaohe Plain, and one of the most important bases of grain production in the north of China. Many methods are used in related studies, but there is a lack of comprehensive research, especially that of zoning and evolution of regional hydrochemical types For this reason, after collection of detailed data and identification of the groundwater flow field, we studied the hydrochemical characteristics by zone with mathematical statistics, correlation analysis, ion proportional coefficient and other methods to identify the current hydrochemical characteristics of shallow groundwater in the region, formation of hydrochemical composition and its evolution laws, uncover the main actions forming the hydrochemical composition of groundwater, and provide a scientific basis and management ideas for agricultural production and ecological protection in Shuangliao City and even the whole Xiliaohe Plain.
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