南水北调典型受水区浅层地下水水化学特征及成因

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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.

Key words： the Middle Route of the South-to-North Water Diversion Project groundwater exploitation reduction hydrochemical characteristics shallow groundwater formation mechanism

Received: 08 October 2021

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X523

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	ZOU Jia-wen
	LIU Fei
	ZHANG Jing-kun

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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[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 2260-2268.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I5/2260

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