Subjects: Geosciences >> Geography submitted time 2024-07-04 Cooperative journals: 《干旱区研究》
Abstract： In order to study the characteristics of hydrochemistry and groundwater recharge in Hotan River Basin, this study analyzed the characteristics of water chemical composition, main recharge sources and mutual transformation of water bodies (well, pond and river) in different geomorphic units by using SPSS statistical analysis, Piper diagram, Gibbs diagram and isotope tracing methods(D, 18O and 14C). The results showed that: (1) The water bodies mainly originated from the ice and snow meltwater and atmospheric precipitation in the middle and high mountainous areas above 2000m in the south. From the mountains to the desert, the groundwater chemical type and salinity had obvious zonal characteristics. The pH value of different water bodies were weakly alkaline, and the ion composition and TDS value were different, with the overall order of pond > well > river. The NO3- content of some groundwater samples were significantly abnormal. (2) The groundwater in the gravel plain area mainly received vertical and disconnected recharge from surface river water. The groundwater had a fast renewal rate, low salinity and main water-rock interaction, mostly SO4•Cl–Ca•Mg type. (3) The TDS value of groundwater in the fine soil plain area had a large range, mostly as the Cl•SO4–Na type. In the inter-river block, the groundwater near the upstream received surface water and lateral runoff from adjacent areas, and the 14C age was small. “Drift Oxygen” of δD and δ18O isotope in the groundwater of the middle and lower reaches was generally appeared. The 14C age of groundwater in the watershed was large, and the age was small near the riverbank. The relation between the groundwater and river was close. On both sides of the inter-river block, the groundwater runoff flowed along the northeast and northwest directions respectively, and finally discharged into the peripheral desert area.The research results can provide theoretical basis for reasonable development and utilization of water resources and ecological environment protection in Hotan River Basin.
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