| DOI: | 10.5194/tc-9-795-2015
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| Scopus记录号: | 2-s2.0-84928751720
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| 论文题名: | Influence of weak layer heterogeneity and slab properties on slab tensile failure propensity and avalanche release area |
| 作者: | Gaume J; , Chambon G; , Eckert N; , Naaim M; , Schweizer J
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| 刊名: | Cryosphere
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| ISSN: | 19940416
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| 出版年: | 2015
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| 卷: | 9, 期:2 | | 起始页码: | 795
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| 结束页码: | 804
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| 语种: | 英语
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| 英文关键词: | avalanche
; elasticity
; finite element method
; fracture
; heterogeneity
; slab
; spatial variation
; tensile strength
; tensile stress
; topography
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| 英文摘要: | Dry-snow slab avalanches are generally caused by a sequence of fracture processes, including failure initiation in a weak snow layer underlying a cohesive slab followed by crack propagation within the weak layer (WL) and tensile fracture through the slab. During past decades, theoretical and experimental work has gradually increased our knowledge of the fracture process in snow. However, our limited understanding of crack propagation and fracture arrest propensity prevents the evaluation of avalanche release sizes and thus impedes hazard assessment. To address this issue, slab tensile failure propensity is examined using a mechanically based statistical model of the slab-WL system based on the finite element method. This model accounts for WL heterogeneity, stress redistribution by slab elasticity and possible tensile failure of the slab. Two types of avalanche release are distinguished in the simulations: (1) full-slope release if the heterogeneity is not sufficient to stop crack propagation and trigger a tensile failure within the slab; (2) partial-slope release if fracture arrest and slab tensile failure occur due to the WL heterogeneity. The probability of these two release types is presented as a function of the characteristics of WL heterogeneity and the slab. One of the main outcomes is that, for realistic values of the parameters, the tensile failure propensity is mainly influenced by slab properties. Hard and thick snow slabs are more prone to wide-scale crack propagation and thus lead to larger avalanches (full-slope release). In this case, the avalanche size is mainly influenced by topographical and morphological features such as rocks, trees, slope curvature and the spatial variability of the snow depth as often claimed in the literature. © Author(s) 2015. |
| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/75312
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| 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; Irstea, UR ETGR, Grenoble, France; Université Grenoble Alpes, Grenoble, France
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| Recommended Citation: | |
Gaume J,, Chambon G,, Eckert N,et al. Influence of weak layer heterogeneity and slab properties on slab tensile failure propensity and avalanche release area[J]. Cryosphere,2015-01-01,9(2)
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