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| DOI：10.13522/j.cnki.ggps.2021190 |
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| Hydrochemistry of Groundwater in Quaternary Aquifers in Tongzhou of Beijing and the Underlying Determinants |
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WANG Xiaosong, LI Baoxue, LI Yang, et al
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Beijing Institute of Geological & Prospecting Engineering, Beijing 100048, China
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| Abstract: |
| 【Background and objective】Groundwater in quaternary aquifers in Tongzhou of Beijing is a main water supply source to the region. Though it has been intensively studied over the past decades, there is a lack of understanding of its hydrochemistry and the underlying determinants. The purpose of this paper is to fill this knowledge gap.【Method】A total 45 water samples were collected from boreholes up to the depth of 300m; their biochemistry and the underlying determinants were analyzed using the piper diagram, Gibb’s diagram and cluster analysis.【Result】The shallow groundwater was HCO3-Ca.Mg type and the deep water was HCO3-Na type. Factor analysis extracted four common factors, and the cumulative variance accounted for 85.45% of the total variance. The results of cluster analysis were consistent with the factor analysis. Factor 1 represents salinity, associated with the weathering of carbonate and silicate minerals. Factor 2 represents pollution of iron and manganese, associated with the weathering of minerals rich in iron and manganese. Factor 3 represents agricultural pollution, associated with agricultural production and agronomic practices. Factor 4 represents fluoride, associated with the weathering of minerals rich in fluorine and cation exchange. Groundwater in the north of the region was affected mainly by agricultural production and agronomic practices. Overall, combined with cation exchange, the weathering of carbonate and silicate minerals, as well as minerals rich in iron, manganese and fluoride modulated the groundwater hydrochemistry in the studied region. |
| Key words: hydrochemistry; groundwater; quaternary aquifers; Tonhzhou; Beijing |
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