和田河流域水化学特征与地下水补给来源分析OA北大核心CSTPCD

The characteristics of hydrochemistry and groundwater recharge in the Hotan River Basin were studied by analyzing the chemical composition of water,primary recharge sources,and mutual transformation of water bodies(wells,ponds,and rivers)in the different geomorphic units.For this,SPSS statistical analysis,Piper dia-gram,Gibbs diagram,and isotope tracing methods(D,18O,and 14C)were used.The results showed that(1)the wa-ter bodies mainly originated from the ice-and snow-meltwater and precipitation in the mid and high mountainous areas>2000 m in the south.From the mountains to the desert,the chemical type and salinity of the groundwater showed obvious zonal characteristics.The different water bodies were weakly alkaline,and the ion composition and TDS values varied with the overall order of pond>well>river.The NO3-contents of a few groundwater sam-ples were significantly abnormal.(2)the groundwater in the gravel plain area mainly received vertical and discon-nected recharge from the surface river water.The groundwater had a fast renewal rate,low salinity,and major wa-ter-rock interactions,mainly of the SO4·Cl-Ca·Mg type.(3)the TDS value of the groundwater in the fine soil plain area varied over an extensive range,mostly of the Cl·SO4-Na type.In the inter-river block,the groundwa-ter near the upstream received surface water and lateral runoff from the adjacent areas,and the 14C age was small."Drift Oxygen"of δD and δ18O isotopes in the groundwater of the middle and lower reaches could be generally observed.The 14C age of the groundwater in the watershed was considerable but minuscule near the riverbank.The relation between the groundwater and the river was close.On both sides of the inter-river block,the ground-water runoff flowed along the northeast and northwest directions,respectively,and finally discharged into the pe-ripheral desert area.The research results can provide a theoretical basis for the reasonable development and utili-zation of water resources and protect the ecology and environment of the Hotan River Basin.