Zobrazeno 1 - 10
of 187
pro vyhledávání: '"Jürg Schweizer"'
Autor:
Martin Hendrick, Frank Techel, Michele Volpi, Tasko Olevski, Cristina Pérez-Guillén, Alec van Herwijnen, Jürg Schweizer
Publikováno v:
Journal of Glaciology, Vol 69, Pp 1365-1378 (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
Externí odkaz:
https://doaj.org/article/1bd85133ff324a09b47a57e4d988cd41
Autor:
Bastian Bergfeld, Alec van Herwijnen, Grégoire Bobillier, Eric Larose, Ludovic Moreau, Bertil Trottet, Johan Gaume, Janic Cathomen, Jürg Dual, Jürg Schweizer
Publikováno v:
Journal of Glaciology, Vol 68, Pp 557-570 (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 occurr
Externí odkaz:
https://doaj.org/article/2bd78ff53b7643b48a3b4cb550536a78
Publikováno v:
Journal of Glaciology, Vol 67, Pp 1147-1162 (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
Externí odkaz:
https://doaj.org/article/c906d489c1f24d3e8500549822d6d37a
Autor:
Grégoire Bobillier, Bastian Bergfeld, Jürg Dual, Johan Gaume, Alec van Herwijnen, Jürg Schweizer
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
Abstract Dry-snow slab avalanches result from crack propagation in a highly porous weak layer buried within a stratified and metastable snowpack. While our understanding of slab avalanche mechanisms improved with recent experimental and numerical adv
Externí odkaz:
https://doaj.org/article/bb057f31a0094da484be0eace389574f
Publikováno v:
Journal of Glaciology, Vol 65, Pp 55-67 (2019)
Snow properties relevant to the fracture processes involved in dry-snow slab avalanche release include weak layer specific fracture energy, slab elastic modulus and density. Various techniques exist to determine these snow mechanical properties, but
Externí odkaz:
https://doaj.org/article/696b5f0764d84bb889f2b7b6e8f1fd4c
Autor:
Giacomo Strapazzon, Jürg Schweizer, Igor Chiambretti, Monika Brodmann Maeder, Hermann Brugger, Ken Zafren
Publikováno v:
Frontiers in Physiology, Vol 12 (2021)
Avalanches are major natural hazards in snow-covered mountains, threatening people and infrastructure. With ongoing climate change, the frequency and types of snow avalanches may change, affecting the rates of avalanche burial and survival. With a we
Externí odkaz:
https://doaj.org/article/c8ef0e8a51da4fb19ed9c0fb343f5121
Publikováno v:
Frontiers in Physics, Vol 8 (2020)
Snow is a highly porous material with properties that may strongly differ depending on the environmental conditions. On slopes, the layered snowpack may fail and avalanches occur. Hence, knowing how snow deforms and fails is essential for understandi
Externí odkaz:
https://doaj.org/article/18c7e1731a1f439b9e5beaaaa2996ad2
Publikováno v:
Journal of Glaciology, Vol 64, Pp 543-554 (2018)
Snow slab avalanches are caused by cracks forming and propagating in a weak snow layer below a cohesive slab. The gradual damage process leading to the formation of the initial failure within the weak layer (WL) is still not entirely understood. To t
Externí odkaz:
https://doaj.org/article/ebd723d1bc2f43b9a36dabd94183fa75
Autor:
ALEC VAN HERWIJNEN, JOHAN GAUME, EDWARD H. BAIR, BENJAMIN REUTER, KARL W. BIRKELAND, JÜRG SCHWEIZER
Publikováno v:
Journal of Glaciology, Vol 62, Pp 997-1007 (2016)
Measurements of the mechanical properties of snow are essential for improving our understanding and the prediction of snow failure and hence avalanche release. We performed fracture mechanical experiments in which a crack was initiated by a saw in a
Externí odkaz:
https://doaj.org/article/a627eaec7de84bc2a42ca82ca863e062
Publikováno v:
Sensors, Vol 14, Iss 11, Pp 20975-20999 (2014)
The amount of liquid water in snow characterizes the wetness of a snowpack. Its temporal evolution plays an important role for wet-snow avalanche prediction, as well as the onset of meltwater release and water availability estimations within a river
Externí odkaz:
https://doaj.org/article/10a39347496b4d968a4bb41035572b38