Contribution of time-related environmental tracing combined with tracer tests for characterization of a groundwater conceptual model: a case study at the Séchilienne landslide, western Alps (France) [Contribution du traçage environnemental lié au temps combiné avec des essais de traçage pour la caractérisation d’un modèle conceptuel de l’eau souterraine: une étude de cas au glissement de Séchilienne, Alpes occidentales (France)] [Contribuição dos traçadores ambientais relacionados ao tempo combinados a testes com traçadores para a caracterização de modelo conceitual de água subterrânea: estudo de caso no deslizamento de Séchilienne, oeste alpino (França)] [Contribución al seguimiento ambiental en relación al tiempo combinado con pruebas de trazadores para la caracterización de un modelo conceptual de las aguas subterráneas: un estudio de caso en el deslizamiento de tierra en Séchilienne, Alpes occidentales (Francia)]

Groundwater-level rise plays an important role in the activation or reactivation of deep-seated landslides and so hydromechanical studies require a good knowledge of groundwater flows. Anisotropic and heterogeneous media combined with landslide deformation make classical hydrogeological investigations difficult. Hydrogeological investigations have recently focused on indirect hydrochemistry methods. This study aims at determining the groundwater conceptual model of the Séchilienne landslide and its hosting massif in the western Alps (France). The hydrogeological investigation is streamlined by combining three approaches: a one-time multi-tracer test survey during high-flow periods, a seasonal monitoring of the water stable-isotope content and electrical conductivity, and a hydrochemical survey during low-flow periods. The complexity of the hydrogeological setting of the Séchilienne massif leads to development of an original method to estimate the elevations of the spring recharge areas, based on topographical analyses and water stable-isotope contents of springs and precipitation. This study shows that the massif supporting the Séchilienne landslide is characterized by a dual-permeability behaviour typical of fractured-rock aquifers where conductive fractures play a major role in the drainage. There is a permeability contrast between the unstable zone and the intact rock mass supporting the landslide. This contrast leads to the definition of a shallow perched aquifer in the unstable zone and a deep aquifer in the intact massif hosting the landslide. The perched aquifer in the landslide is temporary, mainly discontinuous, and its extent and connectivity fluctuate according to the seasonal recharge. © 2015, Springer-Verlag Berlin Heidelberg.