Assessment of doline geometry using geophysics on the Quercy plateau karst (South France) - Normandie Université Access content directly
Journal Articles Earth Surface Processes and Landforms Year : 2011

Assessment of doline geometry using geophysics on the Quercy plateau karst (South France)

Abstract

In the protection of karstic aquifers, the role played by dolines is of interest as these shallow structures can be preferential infiltration pathways for groundwater recharge. In this study, three depressions in South France (Orniac, Lot) were identified and characterized using combined geophysical methods. Apparent conductivity mapping allows precise definition of dolines corresponding to topographic depressions. It also reveals other dolines that are hidden by soil cover. Electrical resistivity and seismic refraction tomography provide detailed cross‐sections. Even though the dolines studied are close one to another, they exhibit great variability in shape and content. Moreover, time‐lapse data show that the most saturated regions are on the edges of the first doline. Such information helps to evaluate human impacts and forecast potential groundwater contamination.

Dates and versions

hal-01740092 , version 1 (21-03-2018)

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Rémi Valois, Christian Camerlynck, Amine Dhemaied, Roger Guerin, Gaghik Hovhannissian, et al.. Assessment of doline geometry using geophysics on the Quercy plateau karst (South France). Earth Surface Processes and Landforms, 2011, 36 (9), pp.1183--1192. ⟨10.1002/esp.2144⟩. ⟨hal-01740092⟩
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