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Verification of Geophysical Models of the Permafrost Distribution within an Alpine Talus Slope Using Borehole Information, Valais, Swiss Alps

In order to determine the spatial extension and the characteristics of the permafrost within alpine talus slopes, thermal and geoelectrical measurements were carried out in several sites of the Swiss Alps (Lambiel 2006, Pieracci et al. 2008). The observations and the measurements carried out at the study sites allowed proposing a model of the permafrost distribution in talus slopes located within the Alpine periglacial belt (Lambiel & Pieracci 2008). According to this model, permafrost appears likely in the lower part of the slope, whereas it is generally improbable upslope. In order to validate the model, in the Attelas talus slope (Verbier area, Valais Alps, 2600-2800 m a.s.l., west-facing flank of the Mont Gele) a fix Electrical Resistivity Tomography (ERT) profile along an upslopedownslope transect composed by 48 electrodes (4 meters interval) was installed in summer 2007, and three boreholes were drilled along the ERT profile in autumn 2008.