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<dc:title xml:lang="en">Geo-electrical methods for hydrogeological studies – capabilities and limits for the analysis of deep-seated landslides and mountainous watersheds</dc:title>
<dcterms:alternative xml:lang="fr">Méthodes géo-électriques appliquées à l'hydrogéologie - capacités et limites pour la caractérisation des aquifères de glissements de terrain et de bassins versants de montagne</dcterms:alternative>
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<dc:subject xml:lang="fr">Tomographie de résistivité électrique</dc:subject>
<dc:subject xml:lang="fr">Audiomagnétotellurie à source controllée</dc:subject>
<dc:subject xml:lang="fr">Polarisation provoquée</dc:subject>
<dc:subject xml:lang="fr">Caractérisation 3D</dc:subject>
<dc:subject xml:lang="fr">Glissements de terrain</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette thèse analyse la contribution de méthodes géoélectriques pour la caractérisation hydrogéologique de glissements de terrain profonds et de bassins versants de montagne. Ces applications nécessitent des études à l’échelle du versant jusqu’à plusieurs centaines de mètres de profondeur. Des sondages audiomagnétotelluriques à source contrôlée (CSAMT) ont permis de caractériser la structure profonde (profil d’altération) du bassin versant granitique du Strengbach. Une tomographie 3D de résistivité électrique du versant instable de Séchilienne a amélioré la localisation la roche endommagée et la compréhension de son fonctionnement hydrogéologique. Un suivi du signal CSAMT et de polarisation induite a été réalisé sur le glissement de terrain de Lodève, où les pluies cévenoles déstabilisent des unités argileuses et évaporitiques. La sensibilité, la résolution et la dimensionnalité des mesures sont systématiquement discutées. La modélisation de données CSAMT a été explorée car des hypothèses fortes limitent l'applicabilité de la méthode. Des informations complémentaires ont guidé les interprétations géoélectriques.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis aims at studying the contribution of geoelectric methods for constraining hydro-geological models of deep-seated landslides and mountainous watersheds. Such applications require slope-scale studies up to few hundreds of meters depth in heterogeneous and fractured media. 1D Controlled Source Audiomagnetotellurics (CSAMT) helped characterizing the deep structure of the Strengbach granitic catchment (weathering profile). 3D electrical resistivity tomography helped locating the damaged hard-rock and aquifers of the micashistic Séchilienne landslide, validating hypothesis on its hydrogeological functioning. Time-lapse CSAMT and induced polarization experiments were conducted at the Lodève landslide where intense meteorological events cause loss of cohesion in clay and evaporite units. The sensitivity of measurements and the pertinence of 1D, 2D and 3D imagery are systematically discussed as the methodology was developed accordingly. The modeling of CSAMT data was explored as strong hypotheses limit the applicability of the method. Complementary information was systematically integrated to the geoelectrical interpretation.</dcterms:abstract>
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