华南地质2023，Vol.39Issue(4)：672-685,14.DOI:10.3969/j.issn.2097-0013.2023.04.008
广东清远盆地地下水水文地球化学及流场特征
Hydrogeochemical Characterization and Flow Field of Groundwater in the Qingyuan Basin of Guangdong Province,China
摘要
Abstract
The hydrogeological conditions of the Qingyuan Basin are complex.The flow field of the karst drilling data and aquifers in the basin,which accounts for more than half of the area,has not yet been clari-fied.Combined with drilling data and 13 test indexes,including sodium(Na+),potassium(K+),calcium(Ca2+),magnesium(Mg2+),chloride(Cl-),sulfate(SO42-),carbonate(CO32-),bicarbonate(HCO3-),nitrate(NO3-),total dissolved solids(TDS),hydrogen isotope(δD),oxygen isotope(δ18O),and tritium concentration(3H),the hy-drogeochemical characteristics of the Qingyuan Basin have been analyzed,and the characteristics of the karst groundwater flow field in the Qingyuan Basin have been identified.The results show that the sources of groundwater recharge in the Beijiang Basin are atmospheric precipitation and surface water.The hydrochem-istry of karst water is dominated by HCO3-Ca type,while the main water types of low-hill areas around the basin are HCO3·Cl-Na(Ca·Na)and HCO3·Cl-Ca·Na(Mg).According to the range of groundwater recharge and runoff,the planar morphology of the flow field,and burial conditions,the groundwater system in the Qin-gyuan Basin is divided into four zones:the north bank,the southeast bank,the southwest bank and the north-west bank of the Beijiang River.The hydrogeochemical zoning characteristics of karst water in these areas are obvious in the recharge zone-runoff zone-discharge zone.The intensity of cation-exchange reaction and mineralization gradually increases,and the overall TDS values decrease from the Beijiang River and Binjiang River to the surrounding areas,indicating a gradual slowdown trend of runoff from the piedmont recharge zone to the mainstream discharge zone.The abnormally high TDS value of karst water in the middle of the southwest bank of the Beijiang River indicates that this zone would be a stagnant zone.Based on the analysis above of the characteristics of the groundwater flow field in the Qingyuan Basin,a conceptual model of the karst water flow field in the Qingyuan Basin has been established,which could provide a basic geological in-sight for the management of groundwater resources and the prevention and control of groundwater pollution.关键词
岩溶水/水文地球化学特征/流场/氢氧同位素/清远盆地Key words
karst water/Hydrogeochemical characterization/flow field/hydrogen and oxygen isotopes/Qingyuan Basin分类
地质学引用本文复制引用
姜守俊,许兰芳,倪泽华,杨宏宇,涂世亮..广东清远盆地地下水水文地球化学及流场特征[J].华南地质,2023,39(4):672-685,14.基金项目
广东省地质勘查与城市地质专项(2022-20、2023-31) （2022-20、2023-31）
