Université de Neuchâtel

Remobilisation of deep Na-Cl waters by a regional flow system in the Alps: Case study of Saint-Gervais-les-Bains (France) = Remobilisation d’eaux Na-Cl profondes par un système d’écoulement régional dans les Alpes : le cas de Saint-Gervais-les-Bains (France)

Sonney, Romain ; Vuataz, François-David

In: Comptes Rendus Geoscience, 2010, vol. 342, no. 2, p. 151-161

The hydrothermal system of Saint-Gervais-les-Bains, France is located in a south western low-elevation point of the Aiguilles Rouges crystalline Massif. The crystalline rocks are not directly outcropping in the studied area but certainly exist beyond 300 m depth. Uprising waters are pumped from two different aquifers below the Quaternary deposits of the Bon Nant Valley. In the Lower Trias-Permian...

Université de Neuchâtel

Numerical modelling of Alpine deep flow systems: a management and prediction tool for an exploited geothermal reservoir (Lavey-les-Bains, Switzerland)

Sonney, Romain ; Vuataz, François-David

In: Hydrogeology Journal, 2009, vol. 17, no. 3, p. 601-616

The geothermal site of Lavey-les-Bains, Switzerland is an Alpine deep flow system in fractured crystalline rocks. Groundwater analyses since 1973 reveal a mixing process between a deep warm component (68°C and TDS 1.4 g/L) and cold shallow water. The production rate of the new deep well P600, installed in 1997, has amplified this mixing process in well P201, for which a decline in temperature...