Characterization of Undercover Karst Morpholoies by 3d Geostatistical Modeling of Ert Data
Résumé
The study of undercover karst systems and their morphology is difficult to assess using punctual geotechnical tools. Here we present a method using a geostatistical 3D reconstitution based on electrical resistivity tomography (ERT) data to assess the high variability of the karst. We applied this method on the Lascaux hill site (south-west France) in order to: (1) detect karst morphologies under a detrital cover (pinnacles, shelves, karrens); (2) redefine the limit between two limestone formations; (3) define the geometry of the limit between two domains: limestone and detrital materials.