Hydrochemical characteristics and formation mechanism of shallow groundwater in typical water-receiving areas of the South-to-North Water Diversion Project
ZOU Jia-wen, LIU Fei, ZHANG Jing-kun
Hebei Key Laboratory of Intelligent Water Conservancy, School of Water Conservancy and Hydropower, Hebei University of Engineering, Handan 056038, China
Abstract：The hydrochemical characteristics and formation mechanism of shallow groundwater in a representative water-receiving area (the Heilonggang Plain in Handan city) were investigated by using multiple approaches such as descriptive statistics, Piper diagram, ion ratios, saturation indices and chloro-alkaline index. Results showed that shallow groundwater generally changed from salt water to brackish water after the operation of the Middle Route of the SNWDP. There was a close connection between the improvement of shallow groundwater quality and the elevated water table. The hydrochemical types was mainly Na-SO4-Cl in June and Na-HCO3 in December. The evolution of shallow groundwater chemistry was mainly controlled by the dissolution/precipitation of evaporites (halite, gypsum, Glauber’s salt) and carbonate minerals (calcite and dolomite). Additionally, cation exchange modified the cationic concentrations in the most of shallow aquifer, while reverse ion exchange mainly occurred in the groundwater depression cone or some areas with surplus Na+. Human activities (including industrial effluents and domestic sewage, agricultural fertilizers) may be responsible for the individual shallow groundwater samples’ contamination. These findings have important implications for groundwater sustainable development and environmental protection in such water-receiving areas of the Middle Route of the SNWDP.
邹嘉文, 刘飞, 张靖坤. 南水北调典型受水区浅层地下水水化学特征及成因[J]. 中国环境科学, 2022, 42(5): 2260-2268.
ZOU Jia-wen, LIU Fei, ZHANG Jing-kun. Hydrochemical characteristics and formation mechanism of shallow groundwater in typical water-receiving areas of the South-to-North Water Diversion Project. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 2260-2268.
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