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GUILLET Grégoire

PhD Student : EDYTEM

Contact Details

Laboratoire EDYTEM - UMR5204 CNRS, Université Savoie Mont Blanc,
5 bd de la mer Caspienne,
Bâtiment Pôle Montagne
F-73376 Le Bourget du Lac cedex

Email. : gregoire.guillet univ-smb.fr


Ph.D. :

High mountain ice : glaciological study and numerical modeling

Under superivision of : Ludovic RAVANEL, Philip DELINE (EDYTEM)

Collaboration :
Insitut des Géosciences de l’Environnement (IGE), Grenoble, UMR 5001
Institut des Sciences de la Terre (ISTerre), Grenoble, UMR 5275

Keywords : Mont-Blanc massif, Permafrost, Numerical methods, Bayesian statistics, Ground Penetrating Radar, Glaciology, Python programming, _ _ Signal Processing, Markov Chain Monte-Carlo.

Abstract :

Ice-snow covers, hanging glaciers and interstitial permafrost ice form a fragile system ensuring rock face stability. Recent climate change jeopardizes this equilibrium and permafrost affected- rockwalls destabilizations are arising as a major hazard for mountaineers and high mountain in- frastructure. The effect of high mountain cryosphere on underlying permafrost in steep mountain faces has so far not been extensively studied, likely in part because of their inaccessibility. This lack of knowledge is a major source of uncertainty in the current generation of permafrost models used to predict permafrost occurrence. The fundamental goal of my Ph.D. is to understand how high mountain cryosphere such as ice-snow covers affects underlying permafrost. The project, led in the Mont-Blanc massif, has the following aims : aim 1 is to study ice-snow covers as cryospheric bodies of their own and highlight their thermal regime and dynamics. To do so, we equipped two ice snow covers (Mont Blanc du Tacul (4208m) and Tour Ronde (3792m) north faces) with bore- holes, thermistor chains and ablation probes. Aim 2 is to observe and quantify fractured rockwall kinematics in high mountain using crackmeter measurements and geophysical imaging from the crack system of the summit spur of the Aiguille du Midi (3842 m). Aim 3 is to highlight rockwall kinematics in sectors free of ice using 10 years of LiDAR DEMs on several rock faces of the Mont- Blanc massif. Aim 4 is to implement a 3 dimensional model simulating rockwall kinematics from surface ice degradation to rock mass rupture integrating field observations and thermo-kinematic models.


Oral Presentations and Workshops


International Communication
2017
Guillet G., Ravanel L., (2017). Multi-decadal evolution of ice-snow covers in the Mont-Blanc massif, Haute-Savoie, France. 2017 General Assembly, EGU - Vienna (Austria). (Poster)
Guillet G., Ravanel L., (2017). Multi-decadal evolution of ice-snow covers in the Mont-Blanc massif, Haute-Savoie, France. 2017 ACOP - Sapporo (Japan). (Poster)

Workshops
2017
Guillet G., Ravanel L., (2017). Multi-decadal evolution of ice-snow covers in the Mont-Blanc massif, Haute-Savoie, France. 2017 Journée Glaciologie - Nivologie - Eau en Montagne, SHF - Grenoble (Frabce). (Oral)


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