| 水文与水资源 |
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| Groundwater Recharge and Geochemical Evolution in Quaternary Aquifer of Beidahe River Watershed |
| HE Jian-hua, FU Su-jing, MA Jin-zhu, ZHANG Qing-huan |
| MOE Key Laboratory of Western Chinas Environmental Systems, Lanzhou University, Lanzhou 730000, China |
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Abstract The objectives of this study are to use hydrochemical and stable isotope technology to determine hydrochemical evolution of groundwater and its source in Beidahe river watershed of Gansu province. Along the groundwater path, groundwater evolves gradually from HCO-3 to SO2-4-HCO-3, and then becomes SO2-4. The growth rates of defferent ions are defferent with increase of total dissolved solid. The dissolution of dolomite and gypsum contribute to increase of Mg2+ and SO2-4, and other processes such as cation-exchange have significative contribution on the water composition, especially for Na+. Ca2+ is strongly influenced by dissolution-precipitation and subsequent cation-exchange. Evaporation of shallow groundwater occurred during the path. The stable isotope ranges from -10.28 to -7.85‰ for δ18O, and from -65.07 to -53.85‰ for δD. There is not significant defference for isotope between Jiuquan basin and Zhangye basin in Gansu province, but the isotope is deficient at piedmont compared with at plains in Jiuquan basin. The river runoff is the main source for alluvial fan groundwater, but the deep groundwater is complex. So we must be cautious during the exploitation of groundwater.
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Received: 15 August 2010
Published: 20 November 2011
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2011, Vol. 31 
