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Application of Geophysical and Hydrogeochemical Methods to the Protection of Drinking Groundwater in Karst Regions

Author

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  • Kai Song

    (Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China)

  • Guangxu Yang

    (Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China)

  • Fei Wang

    (Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China)

  • Jian Liu

    (Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China)

  • Dan Liu

    (Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China)

Abstract

To provide theoretical support for the protection of centralized drinking groundwater sources in karst areas, it is necessary to accurately identify the development of karst conduits and analyze the differences in hydrogeochemical characteristics of different karst systems. This provides a scientific basis for the accurate designation of risk zones that may cause drinking groundwater pollution. In this study, a geophysical survey, hydrogeological chemical process analysis and optimized fuzzy cluster analysis were used to gradually improve the understanding of karst water systems. AMT and HDR methods were used to calibrate the resistivity around the water-filling karst conduits, which ranged from 39 to 100 Ω·m. A total of seven karst systems were identified, including four karst systems in the north of the study area, one karst system in the west and two karst systems in the south. Analysis of the hydrochemical data showed that HCO 3 -Ca and HCO 3 -Mg-Ca types accounted for 90% of all samples. The δD and δ 18 O values of their main conduits were −51.70‰ to −38.30‰ and −7.99‰ to −5.96‰, respectively. The optimized fuzzy clustering analysis method based on the weight of variables assigned by AHP more accurately verified karst water systems. Based on these findings, the drinking groundwater source risk zone was designated with an area of 33.90 km 2 , accounting for 34.5% of the study area. This study effectively improved the rationality and accuracy of the designation of drinking groundwater source risk zones in karst areas, and provided a scientific basis for the identification of karst water systems and decision-making of drinking groundwater source protection in karst areas.

Suggested Citation

  • Kai Song & Guangxu Yang & Fei Wang & Jian Liu & Dan Liu, 2020. "Application of Geophysical and Hydrogeochemical Methods to the Protection of Drinking Groundwater in Karst Regions," IJERPH, MDPI, vol. 17(10), pages 1-22, May.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:10:p:3627-:d:361338
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    References listed on IDEAS

    as
    1. Ching-Ping Liang & Cheng-Shin Jang & Cheng-Wei Liang & Jui-Sheng Chen, 2016. "Groundwater Vulnerability Assessment of the Pingtung Plain in Southern Taiwan," IJERPH, MDPI, vol. 13(11), pages 1-19, November.
    2. Mohamed S. Metwally & Sameh M. Shaddad & Manqiang Liu & Rong-Jiang Yao & Ahmed I. Abdo & Peng Li & Jiaoguo Jiao & Xiaoyun Chen, 2019. "Soil Properties Spatial Variability and Delineation of Site-Specific Management Zones Based on Soil Fertility Using Fuzzy Clustering in a Hilly Field in Jianyang, Sichuan, China," Sustainability, MDPI, vol. 11(24), pages 1-19, December.
    3. Hugo Henrique Cardoso de Salis & Adriana Monteiro da Costa & João Herbert Moreira Vianna & Marysol Azeneth Schuler & Annika Künne & Luís Filipe Sanches Fernandes & Fernando António Leal Pacheco, 2019. "Hydrologic Modeling for Sustainable Water Resources Management in Urbanized Karst Areas," IJERPH, MDPI, vol. 16(14), pages 1-19, July.
    4. Kunhua Yang & Guilin Han & Jie Zeng & Bin Liang & Rui Qu & Jinke Liu & Man Liu, 2019. "Spatial Variation and Controlling Factors of H and O Isotopes in Lancang River Water, Southwest China," IJERPH, MDPI, vol. 16(24), pages 1-12, December.
    5. Xubo Gao & Xue Li & Wanzhou Wang & Chengcheng Li, 2020. "Human Activity and Hydrogeochemical Processes Relating to Groundwater Quality Degradation in the Yuncheng Basin, Northern China," IJERPH, MDPI, vol. 17(3), pages 1-17, January.
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    Cited by:

    1. Fei Wang & Kai Song & Xuelian He & Yue Peng & Dan Liu & Jian Liu, 2021. "Identification of Groundwater Pollution Characteristics and Health Risk Assessment of a Landfill in a Low Permeability Area," IJERPH, MDPI, vol. 18(14), pages 1-19, July.

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