Zobrazeno 1 - 10
of 84
pro vyhledávání: '"Alec van Herwijnen"'
Autor:
Valentin Adam, Bastian Bergfeld, Philipp Weißgraeber, Alec van Herwijnen, Philipp L. Rosendahl
Publikováno v:
Nature Communications, Vol 15, Iss 1, Pp 1-11 (2024)
Abstract When porous materials are subjected to compressive loads, localized failure chains, commonly termed anticracks, can occur and cause large-scale structural failure. Similar to tensile and shear cracks, the resistance to anticrack growth is go
Externí odkaz:
https://doaj.org/article/10f2e491315a46e18cba2931752427fb
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:
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
Autor:
Michael Lombardo, Peter Lehmann, Anders Kaestner, Amelie Fees, Alec Van Herwijnen, Jürg Schweizer
Publikováno v:
Annals of Glaciology, Pp 1-10
Liquid water at the ground–snow interface is thought to play a crucial role in the release of glide-snow avalanches, which can be massive and threaten infrastructure in alpine regions. Several mechanisms have been postulated to explain the formatio
Externí odkaz:
https://doaj.org/article/9b2458b75e55407fa5f372f3734528fe
Publikováno v:
Annals of Glaciology, Pp 1-12
Glide-snow avalanches release due to a loss of friction at the snow–ground interface, which can result in large avalanches that endanger infrastructure in alpine regions. The underlying processes are still relatively poorly understood, in part due
Externí odkaz:
https://doaj.org/article/84cecd57cab445159b1cfaf6ad1a73fa
Autor:
Ron Simenhois, Karl W. Birkeland, Johan Gaume, Alec van Herwijnen, Bastian Bergfeld, Bertil Trottet, Ethan Greene
Publikováno v:
Annals of Glaciology, Pp 1-11
Dry-snow slab avalanches release due to crack propagation in a weak snow layer under a cohesive snow slab. Crack propagation speeds can provide insights into the potential size of avalanches and inform fracture and avalanche release models. Despite t
Externí odkaz:
https://doaj.org/article/7c69bbbe79ad40ae83ddb86ba0da3bec