【摘要】为研究河南省济源市沁河冲洪积扇地下水水化学特征及其成因, 2016年10月采集水样共计60组, 其中地下水水样51组, 地表水水样9组.运用数理统计、舒卡列夫分类、Piper三线图、Schoeller图、Gibbs图和离子比值等方法, 分析了研究区内地下水和地表水水化学类型分布特征, 讨论了地下水和表水水化学演化过程的主要控制因素.结果表明:①研究区地表水和地下水中主要阴阳离子为Ca2+、Mg2+、SO42-、HCO3-, 地表水和地下水的补给来源密切相关;②地下水水化学类型以HCO3-Ca型、HCO3-Ca·Mg型和HCO3·SO4-Ca·Mg型为主;地表水水化学类型以HCO3·SO4-Ca·Mg型为主;③地下水和地表水主要离子的形成主要受碳酸盐矿物风化溶解作用、离子交换作用和蒸发作用共同影响, 硫酸、碳酸参与了碳酸盐矿物的风化溶解过程.
【基金资助】 中国地质调查项目 (DD20160310) ;
Hydrochemical Characteristics of Groundwater and the Origin in Alluvial-proluvial Fan of Qinhe River
【Abstract】To study the hydrochemical characteristics of groundwater and the factors controlling the alluvial-proluvial fan of the Qinhe River, 60 samples were collected including 9 surface water samples and 51 groundwater samples. The distribution characteristics of the hydrochemistry and major controlling factors of hydrochemical evolution processes of surface water and groundwater in the study area were analyzed by using mathematical statistics, the Schakerev classification, Piper diagrams, Schoeller diagrams, Gibbs plots, and ion ratios. The results show that ① the major anions and cations of surface water and groundwater in the study area are Ca2+, Mg2+, SO42−, and HCO3−, and the recharge sources of surface water and groundwater are closely related; ② the major hydrochemical types of the groundwater are HCO3-Ca, HCO3-Ca·Mg, and HCO3·SO4-Ca·Mg, while the major hydrochemical type of surface water is HCO3·SO4-Ca·Mg; and ③ the major ions of surface water and groundwater are affected by carbonate mineral weathering and dissolution, ion exchange, and evaporation. Sulfuric acid and carbonic acid were involved in carbonate mineral weathering and dissolution.
【Keywords】 Qinhe River; alluvial-proluvial fan; hydrochemical type; piper diagram; Gibbs plot; ion ratio; origin analysis;
【Funds】 China Geological Survey Project (DD20160310);
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