Hydrogeochemical Characterization and Flow Field of Groundwater in the Qingyuan Basin of Guangdong Province, China

JIANG Shou-Jun; XU Lan-Fang; NI Ze-Hua; YANG Hong-Yu; TU Shi-Liang

doi:10.3969/j.issn.2097-0013.2023.04.008

2023 Vol. 39, No. 4

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Article navigation > South China Geology > 2023 > 39(4): 672-685

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JIANG Shou-Jun, XU Lan-Fang, NI Ze-Hua, YANG Hong-Yu, TU Shi-Liang. 2023. Hydrogeochemical Characterization and Flow Field of Groundwater in the Qingyuan Basin of Guangdong Province, China. South China Geology, 39(4): 672-685. doi: 10.3969/j.issn.2097-0013.2023.04.008

Citation:

JIANG Shou-Jun, XU Lan-Fang, NI Ze-Hua, YANG Hong-Yu, TU Shi-Liang. 2023. Hydrogeochemical Characterization and Flow Field of Groundwater in the Qingyuan Basin of Guangdong Province, China. South China Geology, 39(4): 672-685. doi: 10.3969/j.issn.2097-0013.2023.04.008

Hydrogeochemical Characterization and Flow Field of Groundwater in the Qingyuan Basin of Guangdong Province, China

Guangdong Geological Survey Institute, Guangzhou 510080, Guangdong, China

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Corresponding author: XU Lan-Fang

Received Date: 30 October 2023

Revised Date: 16 November 2023

Abstract

Abstract

The hydrogeological conditions of the Qingyuan Basin are complex. The flow field of the karst aquifers in the basin, which accounts for more than half of the area, has not yet been clarified. Combined with drilling data and 13 test indexes, including sodium (Na⁺), potassium (K⁺), calcium (Ca²⁺), magnesium (Mg²⁺), chloride (Cl^-), sulfate (SO₄^2-), carbonate (CO₃^2-), bicarbonate (HCO₃^-), nitrate (NO₃^-), total dissolved solids (TDS), hydrogen isotope (δD), oxygen isotope (δ¹⁸O), and tritium concentration (³H), the hydrogeochemical characteristics of the Qingyuan Basin have been analyzed, and the characteristics of the karst groundwater flow field in the Qingyuan Basin have been identified. The results show that the sources of groundwater recharge in the Beijiang Basin are atmospheric precipitation and surface water. The hydrochemistry of karst water is dominated by HCO₃-Ca type, while the main water types of low-hill areas around the basin are HCO₃·Cl-Na (Ca·Na) and HCO₃·Cl-Ca·Na (Mg). According to the range of groundwater recharge and runoff, the planar morphology of the flow field, and burial conditions, the groundwater system in the Qingyuan Basin is divided into four zones: the north bank, the southeast bank, the southwest bank and the northwest bank of the Beijiang River. The hydrogeochemical zoning characteristics of karst water in these areas are obvious in the recharge zone-runoff zone-discharge zone. The intensity of cation-exchange reaction and mineralization gradually increases, and the overall TDS values decrease from the Beijiang River and Binjiang River to the surrounding areas, indicating a gradual slowdown trend of runoff from the piedmont recharge zone to the mainstream discharge zone. The abnormally high TDS value of karst water in the middle of the southwest bank of the Beijiang River indicates that this zone would be a stagnant zone. Based on the analysis above of the characteristics of the groundwater flow field in the Qingyuan Basin, a conceptual model of the karst water flow field in the Qingyuan Basin has been established, which could provide a basic geological insight for the management of groundwater resources and the prevention and control of groundwater pollution.
- karst water /
- Hydrogeochemical characterization /
- flow field /
- hydrogen and oxygen isotopes /
- Qingyuan Basin

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