Hydrogeochemical and isotopic composition of groundwater in the Horgos River Watershed in the NorthWestern Ili Basin in Sinkiang Province, China

International Conference on Water Resource and Environment 2016

地球科学;生态环境科学

Jin, S.H.^1 ; Jiang, J.Y.^1 ; Rao, J.P.^1

Institute of Disaster Prevention, Beijing

101601, China^1

关键词: Chemical characteristic;    Hydrogeochemical;    Hydrogeochemical data;    Isotopic composition;    Main controlling factors;    Quaternary aquifers;    River watersheds;    Shallow groundwater;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/39/1/012051/pdf
DOI  :  10.1088/1755-1315/39/1/012051

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

In this study, hydrogeochemical and stable environmental isotopic (oxygen-18 and deuterium) data of groundwater in the Horgos River watershed in the north-western Ili Basin were examined to determine the groundwater chemical characteristics, as well as the origins of the groundwater and surface water. The quaternary aquifer's structure and spatial distribution is complex. Hydrogeochemical data shows that the groundwater is alkaline due to the presence of bicarbonate as the dominant anion. In the north, the dominant groundwater cation was Ca2+while Mg2+ions were highest in the south. In addition, water types varied from HCO3-SO4-Ca and HCO3-SO4-Ca-Mg to HCO3-SO4-Mg-Ca and SO4-HCO3-Mg-Ca. Overall, the groundwater in this study showed high total hardness. The dissolving and evaporation inspissation were considered the main controlling factors. Isotopic data (oxygen-18 and deuterium) indicated that the Horgos River was the main recharge source for the groundwater, which rapidly infiltrated across sandstone macropores. Furthermore, surface water and shallow groundwater were significantly affected by evaporation.