Karst distribution characteristics in a watershed under topographic differentiation and implication for groundwater resource:A case study in Southwest China using ERT and borehole dataOA
Karst landforms are renowned for their unique characteristics,and investigating karst development characteristics is of great significance for groundwater regulation and ecological management.This study aims to interpret karst distribution under different topographic conditions in a watershed using Electrical Resistivity Tomography(ERT).Taking the Chenqi small watershed in Southwest China as the study area,10 ERT survey lines were deployed across three topographic settings(dip slopes,anti-dip slopes,and high-lying depressions).By combining 2D/3D ERT inversion,geological drilling,and outcrop verification,the subsurface karst distribution was revealed.The results show that ERT effectively detects karst features with high heterogeneity and discontinuity.Conduit-type karst appears in the middle section of both slopes,indicating groundwater migration pathways.Karst water is dominated by runoff on dip slopes,whereas infiltration dominates on anti-dip slopes;continuous low-resistivity aquicludes in high-lying depressions control local groundwater levels.The average karst zone thickness is 2.04.0 m,with a maximum of 12 m.These findings demonstrate a coupled relationship between karst structure and groundwater runoff under topographic differentiation,providing a quantitative reference for watershed-scale groundwater processes and practical value for karst water exploration,resource regulation,and slope stability assessment.
Zhan-yu Tang;De-qiu Dai;Wei-wei Jiang;Ren-jian Deng
School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,Hunan Province,China School of Earth Sciences and Spatial Information Engineering,Hunan University of Science and Technology,Xiangtan 411201,Hunan Province,China State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China.School of Earth Sciences and Spatial Information Engineering,Hunan University of Science and Technology,Xiangtan 411201,Hunan Province,ChinaState Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China.School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,Hunan Province,China
天文与地球科学
HydrogeophysicsElectrical Resistivity Tomography(ERT)Geological drillingKarst distribution characteristicsGroundwater processes
《Journal of Groundwater Science and Engineering》 2026 (3)
P.271-287,17
supported by Key Research and Development Program of Hunan Provincial Department of Science and Technology(No.2022SK2073)Young Scientists Fund of the National Natural Science Foundation of China(No.42407118).
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