干旱区地理2024，Vol.47Issue(5)：753-761,9.DOI:10.12118/j.issn.1000-6060.2023.481
和田河中下游流域地下水水化学特征及其演化规律
Chemical characteristics and evolution of groundwater in the middle and lower reaches of Hotan River Basin
摘要
Abstract
To investigate the chemical characteristics of groundwater and its evolutionary patterns in the middle and lower reaches of the Hotan River Basin,Xinjiang,China,this study analyzed 21 groundwater samples from the area.It included an examination of the constituents and origins of groundwater solutes and the reverse simula-tion of hydrogeochemical processes.The analysis employed Piper trilinear diagrams,Gibbs diagrams,PHREEQC software,and mathematical statistics to explore the chemical properties of groundwater,the principal sources of solutes,and their evolution in the study region.The results revealed that:(1)High concentrations of eight conven-tional ions in the groundwater,with Cl-,SO42-,Na+,Ca2+,and HCO3-being particularly abundant.(2)There was a significant spatial variability in the dissolved constituents of the groundwater.The predominant chemical types were SO4·Cl-Ca·Mg and SO4·Cl-Na,with the latter being more common across most areas.The groundwater's alkalinity was generally low,and the water quality in most regions met daily drinking water standards.However,in some oasis plains,elevated NO3-levels were attributed to human activities.(3)The dissolution of minerals such as halite,calcite,dolomite,and gypsum,facilitated by water-rock interactions and cation exchange,was identified as the main source of Na+,Ca2+,Mg2+,Cl-,and SO42-ions in the groundwater.During transit to finer soil plains and desert areas,ion concentrations increased due to evaporation and concentration processes.(4)In open system con-ditions,CO2 enhanced the dissolution of various minerals,leading to increased ion concentrations.As groundwa-ter flowed into the alluvial plains downstream,the fine sand layer acted as a barrier,reducing the intensity of groundwater flow and solute leaching,with evaporation and concentration processes becoming more dominant.This study provides a theoretical foundation for the sustainable development and management of water resources and environmental protection in the Hotan River Basin.关键词
水化学特征/水文地球化学/水-岩作用/地下水/和田河流域Key words
hydrochemical characteristics/hydrogeochemistry/water-rock interaction/groundwater/Hotan River Basin引用本文复制引用
李小等,常亮,段瑞,王倩,杨泽东,张群慧,张鹏伟..和田河中下游流域地下水水化学特征及其演化规律[J].干旱区地理,2024,47(5):753-761,9.基金项目
第三次新疆综合科学考察业务项目(2022xjkk0300) （2022xjkk0300）
陕西省创新能力支撑计划-旱区地下水文过程与表生生态重点科技创新团队科研项目(2019TD-040)资助 （2019TD-040）
