DOI: 10.5194/tc-9-1969-2015
Scopus记录号: 2-s2.0-84943774704
论文题名: Microstructure-based modeling of snow mechanics: A discrete element approach
作者: Hagenmuller P ; , Chambon G ; , Naaim M
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期: 5 起始页码: 1969
结束页码: 1982
语种: 英语
英文关键词: artifact
; curvature
; deformation
; discrete element method
; microstructure
; sensitivity analysis
; three-dimensional modeling
英文摘要: Rapid and large deformations of snow are mainly controlled by grain rearrangements, which occur through the failure of cohesive bonds and the creation of new contacts. We exploit a granular description of snow to develop a discrete element model based on the full 3-D microstructure captured by microtomography. The model assumes that snow is composed of rigid grains interacting through localized contacts accounting for cohesion and friction. The geometry of the grains and of the intergranular bonding system are explicitly defined from microtomographic data using geometrical criteria based on curvature and contiguity. Single grains are represented as rigid clumps of spheres. The model is applied to different snow samples subjected to confined compression tests. A detailed sensitivity analysis shows that artifacts introduced by the modeling approach and the influence of numerical parameters are limited compared to variations due to the geometry of the microstructure. The model shows that the compression behavior of snow is mainly controlled by the density of the samples, but that deviations from a pure density parameterization are not insignificant during the first phase of deformation. In particular, the model correctly predicts that, for a given density, faceted crystals are less resistant to compression than rounded grains or decomposed snow. For larger compression strains, no clear differences between snow types are observed. © 2015 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75236
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: Météo-France - CNRS, CNRM-GAME, UMR 3589, CEN, Saint Martin d'Hères, France; Irstea, UR ETGR Erosion torrentielle, neige et avalanches, Saint Martin d'Hères, France; Université Grenoble Alpes, Grenoble, France
Recommended Citation:
Hagenmuller P,, Chambon G,, Naaim M. Microstructure-based modeling of snow mechanics: A discrete element approach[J]. Cryosphere,2015-01-01,9(5)