DOI: 10.5194/tc-11-217-2017
Scopus记录号: 2-s2.0-85011032594
论文题名: Snow fracture in relation to slab avalanche release: Critical state for the onset of crack propagation
作者: Gaume J ; , Van Herwijnen A ; , Chambon G ; , Wever N ; , Schweizer J
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期: 1 起始页码: 217
结束页码: 228
语种: 英语
英文关键词: avalanche
; collapse
; crack propagation
; deformation mechanism
; elasticity
; numerical model
; slope angle
; slope dynamics
; slope failure
; snow cover
英文摘要: The failure of a weak snow layer buried below cohesive slab layers is a necessary, but insufficient, condition for the release of a dry-snow slab avalanche. The size of the crack in the weak layer must also exceed a critical length to propagate across a slope. In contrast to pioneering shear-based approaches, recent developments account for weak layer collapse and allow for better explaining typical observations of remote triggering from low-angle terrain. However, these new models predict a critical length for crack propagation that is almost independent of slope angle, a rather surprising and counterintuitive result. Based on discrete element simulations we propose a new analytical expression for the critical crack length. This new model reconciles past approaches by considering for the first time the complex interplay between slab elasticity and the mechanical behavior of the weak layer including its structural collapse. The crack begins to propagate when the stress induced by slab loading and deformation at the crack tip exceeds the limit given by the failure envelope of the weak layer. The model can reproduce crack propagation on low-angle terrain and the decrease in critical length with increasing slope angle as modeled in numerical experiments. The good agreement of our new model with extensive field data and the ease of implementation in the snow cover model SNOWPACK opens a promising prospect for improving avalanche forecasting. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75613
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: WSL Institute for Snow and Avalanche Research SLF, Davos, Switzerland; EPFL Swiss Federal Institute of Technology, School of Architecture, Civil and Environmental Engineering, Lausanne, Switzerland; Université Grenoble Alpes, Irstea, UR ETGR, Grenoble, France
Recommended Citation:
Gaume J,, Van Herwijnen A,, Chambon G,et al. Snow fracture in relation to slab avalanche release: Critical state for the onset of crack propagation[J]. Cryosphere,2017-01-01,11(1)