气候变化领域集成服务门户(CCPortal): Microstructure-based modeling of snow mechanics: A discrete element approach

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DOI	10.5194/tc-9-1969-2015
	Microstructure-based modeling of snow mechanics: A discrete element approach
	Hagenmuller P.; Chambon G.; Naaim M.
发表日期	2015
ISSN	19940416
卷号	9 期号:5
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).
学科领域	artifact; curvature; deformation; discrete element method; microstructure; sensitivity analysis; three-dimensional modeling
语种	英语
scopus关键词	artifact; curvature; deformation; discrete element method; microstructure; sensitivity analysis; three-dimensional modeling
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119795
作者单位	Météo-France - CNRS, CNRM-GAME, UMR 3589, CEN, Saint Martin d'Hères, 38400, France; Irstea, UR ETGR Erosion torrentielle, neige et avalanches, Saint Martin d'Hères, 38402, France; Université Grenoble Alpes, Grenoble, 38000, France
推荐引用方式 GB/T 7714	Hagenmuller P.,Chambon G.,Naaim M.. Microstructure-based modeling of snow mechanics: A discrete element approach[J],2015,9(5).
APA	Hagenmuller P.,Chambon G.,&Naaim M..(2015).Microstructure-based modeling of snow mechanics: A discrete element approach.Cryosphere,9(5).
MLA	Hagenmuller P.,et al."Microstructure-based modeling of snow mechanics: A discrete element approach".Cryosphere 9.5(2015).