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Mechanics of the Ski-Snow Contact [PDF]

Tribology Letters, 2018
Two outstanding questions of the ski-snow friction are considered: the deformation mode of the snow and the real contact area. The deformation of hard, well sintered snow in a short time impact has been measured with a special linear friction tester ...
Luthi, A., Rhyner, H., Schneebeli, M., Szabo, D., Theile, T.   +4 more
core   +3 more sources

Fracture toughness of mixed-mode anticracks in highly porous materials [PDF]

Nature Communications
When porous materials are subjected to compressive loads, localized failure chains, commonly termed anticracks, can occur and cause large-scale structural failure.
Valentin Adam, Bastian Bergfeld, Philipp Weißgraeber, Alec van Herwijnen, Philipp L. Rosendahl   +4 more
doaj   +3 more sources

Antarctic Snow Failure Mechanics: Analysis, Simulations, and Applications. [PDF]

Materials (Basel)
Snow failure is the process by which the stability of snow or snow-covered slopes is destroyed, resulting in the collapse or release of snow. Heavy snowfall, low temperatures, and volatile weather typically cause consequences in Antarctica, which can occur at different scales, from small, localized collapses to massive avalanches, and result in ...
Xiao E, Li S, Matin Nazar A, Zhu R, Wang Y.   +4 more
europepmc   +3 more sources

Role of Ice Mechanics on Snow Viscoplasticity

Geophysical Research Letters
The porous structure of snow becomes denser with time under gravity, primarily due to the creep of its ice matrix with viscoplasticity. Despite investigation of this behavior at the macroscopic scale, the driving microscopic mechanisms are still not well
Louis Védrine, Pascal Hagenmuller, Lionel Gélébart, Maurine Montagnat, Antoine Bernard   +4 more
doaj   +4 more sources

Crack propagation speeds in weak snowpack layers

Journal of Glaciology, 2022
For the release of a slab avalanche, crack propagation within a weak snowpack layer below a cohesive snow slab is required. As crack speed measurements can give insight into underlying processes, we analysed three crack propagation events that occurred ...
Bastian Bergfeld, Alec van Herwijnen, Grégoire Bobillier, Eric Larose, Ludovic Moreau, Bertil Trottet, Johan Gaume, Janic Cathomen, Jürg Dual, Jürg Schweizer   +9 more
doaj   +1 more source

Snow mechanical property variability at the slope scale – implication for snow mechanical modelling

The Cryosphere, 2023
Abstract. Snow avalanches represent a natural hazard to infrastructure and backcountry recreationists. Risk assessment of avalanche hazard is difficult due to the sparse nature of available observations informing on snowpack mechanical and geophysical properties and overall stability.
F. Meloche, F. Meloche, F. Gauthier, F. Gauthier, A. Langlois, A. Langlois   +5 more
openaire   +6 more sources

Modeling spatially distributed snow instability at a regional scale using Alpine3D

Journal of Glaciology, 2021
Assessing the avalanche danger level requires snow stratigraphy and instability data. As such data are usually sparse, we investigated whether distributed snow cover modeling can be used to provide information on spatial instability patterns relevant for
Bettina Richter, Jürg Schweizer, Mathias W. Rotach, Alec van Herwijnen   +3 more
doaj   +1 more source

Temporal evolution of crack propagation characteristics in a weak snowpack layer: conditions of crack arrest and sustained propagation [PDF]

Natural Hazards and Earth System Sciences, 2023
For a slab avalanche to release, we need sustained crack propagation in a weak snow layer beneath a cohesive snow slab – a process we call dynamic crack propagation. Field measurements on crack propagation are very scarce. We therefore performed a series
B. Bergfeld, A. van Herwijnen, G. Bobillier, P. L. Rosendahl, P. Weißgraeber, V. Adam, V. Adam, J. Dual, J. Schweizer   +8 more
doaj   +1 more source

Automated prediction of wet-snow avalanche activity in the Swiss Alps

Journal of Glaciology, 2023
Wet-snow avalanches are triggered by the infiltration of liquid water which weakens the snowpack. Wet-snow avalanches are among the most destructive avalanches, yet their release mechanism is not sufficiently understood for a process-based prediction ...
Martin Hendrick, Frank Techel, Michele Volpi, Tasko Olevski, Cristina Pérez-Guillén, Alec van Herwijnen, Jürg Schweizer   +6 more
doaj   +1 more source

Disentangling creep and isothermal metamorphism during snow settlement with X-ray tomography

Journal of Glaciology, 2023
Once fallen, snow settles due to the combined effects of metamorphism and deformation of the ice matrix under gravity. To understand how these coupled processes affect snow evolution, we performed oedometric compression tests and continuously monitored ...
Antoine Bernard, Pascal Hagenmuller, Maurine Montagnat, Guillaume Chambon   +3 more
doaj   +1 more source