Kinematics and thermal conditions in the permafrost-affected rockwalls of the Aiguille du Midi (3842 m a.s.l., Mont Blanc massif, France).

Abstract : Processes that control climate-dependent rockfall from permafrost-affected rock slopes are still poorly understood.In this study, we present the results of a Wireless Sensor Network, integrated within the Swiss project PermaSenseand developed in 2012, to measure rock temperature and geotechnical parameters in the steep rockwalls of theAiguille du Midi (AdM, 3842 m a.s.l., Mont Blanc massif, France). Accessible year round by cable car, the AdMcomprises two main peaks: (i) the Piton Nord with the cable car arrival station, where 4 crack-meters are placed onfour major fractures, and (ii) the Piton Central with many touristic infrastructure, equipped with three 10-m-deepboreholes with 15 temperatures sensors since 2009, and where 2 crack-meters are installed along a major fracture.Three major kinematic regimes are observed: (i) opening of clefts when the rock temperature becomes positive,followed by closing during the cold period, (ii) summer opening continued by a winter opening, and (iii) closingduring the warm period followed by opening in winter.
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Conference papers
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Submitted on : Monday, April 30, 2018 - 9:57:53 AM
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  • HAL Id : hal-01781303, version 1

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Ludovic Ravanel, Germain Grangier, Samuel Weber, Jan Beutel, Florence Magnin, et al.. Kinematics and thermal conditions in the permafrost-affected rockwalls of the Aiguille du Midi (3842 m a.s.l., Mont Blanc massif, France).. EGU 2016, European Geosciences Union, Apr 2016, Vienne, Austria. ⟨hal-01781303⟩

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