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

Auteur(s) et Affiliation(s)

VALOIS, R.
Univ. Pierre et Marie Curie -Paris 6, UMR 7619 Sisyphe, Paris, France
Univ. Pierre et Marie Curie -Paris 6, UMR 7619 Sisyphe, Paris, France
DHEMAIED, A.
Univ. Pierre et Marie Curie -Paris 6, UMR 7619 Sisyphe, Paris, France
GUERIN, R.
Univ. Pierre et Marie Curie -Paris 6, UMR 7619 Sisyphe, Paris, France
Institut de Recherche pour le Développement (IRD) Centre Ile-de-France, BONDY, France
PLAGNES, V.
Univ. Pierre et Marie Curie -Paris 6, UMR 7619 Sisyphe, Paris, France
REJIBA, F.
Univ. Pierre et Marie Curie -Paris 6, UMR 7619 Sisyphe, Paris, France
ROBAIN, H.
Institut de Recherche pour le Développement (IRD) Centre Ile-de-France, BONDY, France


Description :
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.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2011, vol. 36, n°. 9, p. 1183-1192, nombre de pages : 10, Références bibliographiques : 31 ref.

Date :
2011

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
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