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

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 scientifi...

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Autores principales: Song, Kai, Yang, Guangxu, Wang, Fei, Liu, Jian, Liu, Dan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7277465/
https://www.ncbi.nlm.nih.gov/pubmed/32455762
http://dx.doi.org/10.3390/ijerph17103627
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author Song, Kai
Yang, Guangxu
Wang, Fei
Liu, Jian
Liu, Dan
author_facet Song, Kai
Yang, Guangxu
Wang, Fei
Liu, Jian
Liu, Dan
author_sort Song, Kai
collection PubMed
description 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.
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spelling pubmed-72774652020-06-15 Application of Geophysical and Hydrogeochemical Methods to the Protection of Drinking Groundwater in Karst Regions Song, Kai Yang, Guangxu Wang, Fei Liu, Jian Liu, Dan Int J Environ Res Public Health Article 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. MDPI 2020-05-21 2020-05 /pmc/articles/PMC7277465/ /pubmed/32455762 http://dx.doi.org/10.3390/ijerph17103627 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Song, Kai
Yang, Guangxu
Wang, Fei
Liu, Jian
Liu, Dan
Application of Geophysical and Hydrogeochemical Methods to the Protection of Drinking Groundwater in Karst Regions
title Application of Geophysical and Hydrogeochemical Methods to the Protection of Drinking Groundwater in Karst Regions
title_full Application of Geophysical and Hydrogeochemical Methods to the Protection of Drinking Groundwater in Karst Regions
title_fullStr Application of Geophysical and Hydrogeochemical Methods to the Protection of Drinking Groundwater in Karst Regions
title_full_unstemmed Application of Geophysical and Hydrogeochemical Methods to the Protection of Drinking Groundwater in Karst Regions
title_short Application of Geophysical and Hydrogeochemical Methods to the Protection of Drinking Groundwater in Karst Regions
title_sort application of geophysical and hydrogeochemical methods to the protection of drinking groundwater in karst regions
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7277465/
https://www.ncbi.nlm.nih.gov/pubmed/32455762
http://dx.doi.org/10.3390/ijerph17103627
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