摘要
为研究汉中盆地不同径流条件下地下水水化学特征,在汉江南北两岸以及汉江支流褒河和文川河共选取了31件潜水样品进行水质分析。综合运用数理统计、Piper三线图以及矿物的饱和指数分析等方法,分析了汉中盆地不同径流条件下地下水的水化学特征变化规律。结果显示:在不同径流条件下,地下水主要离子组成差别不大;在空间上,沿径流方向,在汉江干流南北两岸大部分主要离子的浓度、pH及TDS均出现了较为明显的波动;在褒河,除Ca^(2+)和Mg^(2+)的变化不显著外,其他离子含量均缓慢增高,pH和TDS先降低后升高;而在文川河,除K^(+)和Na^(+)在下游呈略微上升外,其他各离子的含量均呈降低趋势,pH和TDS整体呈下降趋势。汉中盆地地下水整体为弱碱性低矿化度水,地下水化学类型主要为HCO_(3)-Ca型,局部地段为HCO_(3)-Ca·Mg型;饱和指数表明岩盐和CO_(2)处于未饱和状态,方解石和白云石已基本处于平衡状态。
In order to study the hydrochemical characteristics of groundwater under different runoff conditions in Hanzhong Basin,a total of 31 groundwater samples were selected from the north and south banks of the Han River and the tributary of the Han River,Bao River and Wenchuan River,for water quality analysis.By means of mathematical statistics,Piper triplot and mineral saturation index analysis,the author analyzed the variation law of groundwater hydrochemical characteristics under different runoff conditions in Hanzhong Basin.The results show that under different runoff conditions,there is little difference in the composition of the main ions of groundwater;Spatially,the concentration,pH and TDS of most of the main ions on the north and south banks of the Hanjiang River fluctuated significantly along the direction of runoff.In Bao River,except for the insignificant changes of Ca^(2+)and Mg^(2+),the content of other ions increased slowly,and the pH and TDS decreased firstly and then increased.In the Wenchuan River,except for the slight increase of K^(+)and Na^(+)in the downstream,the content of other ions showed a decreasing trend,and the pH and TDS showed an overall decreasing trend.The groundwater in the Hanzhong Basin is weakly alkaline and low-salinity water as a whole.The hydrochemical type of the groundwater is mainly HCO_(3)-Ca type,and some areas are HCO_(3)-Ca·Mg type.The saturation index indicates that rock salt and CO_(2) is in an unsaturated state,and calcite and dolomite are basically in equilibrium state.
作者
韩朝辉
朱一龙
王郅睿
丁廉超
田辉
赵超
赵立磊
赵浩
李新斌
龚文强
王凡
HAN Chao-hui;ZHU Yi-long;WANG Zhi-rui;DING Lian-chao;TIAN Hui;ZHAO Chao;ZHAO Li-lei;ZHAO Hao;LI Xin-bin;GONG Wen-qiang;WANG Fan(Xi′an Mineral Resources Survey Center of China Geological Survey,Xi’an 710100,China)
出处
《地下水》
2022年第1期26-29,63,共5页
Ground water
基金
南水北调汉江流域陕西段水生态修复支撑调查项目(DD20208068)
西安城市群周边健康地质调查试点项目(DD20211574)
熊耳山-伏牛山矿集区生态修复支撑调查项目(DD20208079)。
