Hydrochemical characteristics and salinity of groundwater in the Ejina Basin, Northwestern China
Hydrochemical characteristics and salinity of groundwater in the Ejina Basin, Northwestern China
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DOI：
10.1007/s00254-005-0001-7
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发表时间：
2005-07
期刊：
影响因子：
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通讯作者：
X. Wen;Yanqing Wu;Jing Su;Yafeng Zhang;Fan Liu
中科院分区：
文献类型：
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作者：
X. Wen;Yanqing Wu;Jing Su;Yafeng Zhang;Fan Liu
对额济纳盆地地下水进行了水化学调查，查明了地下水的水化学特征和矿化度。结果表明，该地区地下水为微咸水，从补给区到排泄区具有明显的矿化度和水型分带性。离子比图和饱和指数（SI）计算表明，硅酸盐岩石风化和蒸发沉积是决定研究区的主要离子组成的主导过程。地下水稳定同位素δ 18 O和δD组成多为大气降水特征，表明地下水主要来源于大气降水，且大部分地下水经历了长期的蒸发作用。根据放射性同位素氚（3 H）分析，对不同含水层的地下水年龄进行了近似估算。地下水的年龄范围从小于5年，5年至50年，超过50年。在河流水影响带1 km范围内，地下水主要由近代黑河水补给，浅层地下水年龄小于5年。河水影响带1 km ~ 10 km范围内，地下水水源来自混合沃茨水，浅层含水层地下水年龄在5年~ 50年之间。深层承压含水层地下水年龄大于50年。
A hydrochemical investigation was conducted in the Ejina Basin to identify the hydrochemical characteristics and the salinity of groundwater. The results indicate that groundwater in the area is brackish and are significantly zonation in salinity and water types from the recharge area to the discharge area. The ionic ration plot and saturation index (SI) calculation suggest that the silicate rock weathering and evaporation deposition are the dominant processes that determine the major ionic composition in the study area. Most of the stable isotope δ18O and δD compositions in the groundwater is a meteoric water feature, indicating that the groundwater mainly sources from meteoric water and most groundwater undergoes a long history of evaporation. Based on radioactive isotope tritium (3H) analysis, the groundwater ages were approximately estimated in different aquifers. The groundwater age ranges from less than 5 years, between 5 years and 50 years, and more than 50 years. Within 1 km of the river water influence zone, the groundwater recharges from recent Heihe river water and the groundwater age is about less than 5 years in shallow aquifer. From 1 km to 10 km of the river water influence zone, the groundwater sources from the mixture waters and the groundwater age is between 5 years and 50 years in shallow aquifer. The groundwater age is more than 50 years in deep confined aquifer.