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)

• Published in: Hydrogeology journal Vol. 23; no. 8; pp. 1761 - 1779
• Main Authors: Vallet, A, Bertrand, C, Mudry, J, Bogaard, T, Fabbri, O, Baudement, C, Régent, B
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-12-2015; Springer Nature B.V
• Subjects: Activation; Alps; Anisotropy; Aquatic Pollution; Aquifers; Case studies; deformation; drainage; Earth and Environmental Science; Earth Sciences; electrical conductivity; Environment; Geology; Geophysics/Geodesy; Groundwater; Groundwater flow; Groundwater levels; High flow; hydrochemistry; Hydrogeology; Hydrology/Water Resources; Landslides; Landslides & mudslides; Low flow; Massifs; monitoring; Permeability; Recharge; Rock; Rocks; spring; stable isotopes; surveys; Waste Water Technology; Water Management; Water Pollution Control; Water Quality/Water Pollution; Water springs; France; Alps region; Alps; France, Alps Mts; ANE, France; Tracer tests; Landslide; Hydrochemistry; France; Conceptual models
• ISSN: 1431-2174; 1435-0157
• DOI: 10.1007/s10040-015-1298-2

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.