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| Hydrochemical characteristics of groundwater in Laoguanhe River Basin of Danjiangkou Reservoir |
| DAI Zhenwei1,2, WANG Lei1,2, FU Yongpeng1,2, ZHANG Yu1,2, ZHANG Fangliang3, DONG Xincen3, HE Xiaohei4 |
1. Wuhan Geological Survey Center, China Geological Survey, Wuhan 430205, China;
2. Central South China Innovation Center for Geosciences, Wuhan 430205, China;
3. NO.1 Institute of Geo-Environment Survey, Henan Bureau of Geological Exploration and Development, Zhengzhou 450000, China;
4. School of Water Resources & Environmental Engineering, East China University of Technology, Nanchang 330013, China |
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Abstract As water source of the Middle Route of South-to-North Water Transfer Project, the water quality of groundwater in Danjiangkou Reservoir is the key factor influencing the construction of South-to-North Water Transfer Project. In order to ensure the water transfer from Danjiangkou Reservoir to Beijing, the authors investigated the hydrochemical characters of groundwater, based on the sampling, statistics and related analysis of groundwater in Laoguanhe River Basin. The results show that the groundwater in Laoguanhe River Basin of Danjiangkou belongs to alkalescence and low mineral, and the dominant cation is Ca2+, while the dominant anion is $HCO_3^-$. Except for the $NO_3^-$, the main ions contents can reach the drinking water standard of China and the World Health Organization. The main hydrochemical types are Ca-Mg-HCO3 and Ca-HCO3 in both high-water and low-water periods, and the hydrochemistry process is mainly efflorescence-lixiviation. The $NO_3^-$ content of groundwater exceeds 13% to 17%, and the Cl- type groundwater may occur during high-water period. Season change barely influenced the spatial distribution of groundwater hydrochemical type in Laoguanhe River Basin, and the groundwater quality is mainly influenced by the human activities, such as agriculture, aquaculture, industrial residual waste and domestic sewage.
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Received: 30 April 2019
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2019, Vol. 6 
