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DOI	10.5194/tc-8-2255-2014
	Study of a temperature gradient metamorphism of snow from 3-D images: Time evolution of microstructures, physical properties and their associated anisotropy
	Calonne N.; Flin F.; Geindreau C.; Lesaffre B.; Rolland Du Roscoat S.
发表日期	2014
ISSN	19940416
卷号	8 期号:6
英文摘要	We carried out a study to monitor the time evolution of microstructural and physical properties of snow during temperature gradient metamorphism: a snow slab was subjected to a constant temperature gradient in the vertical direction for 3 weeks in a cold room, and regularly sampled in order to obtain a series of three-dimensional (3-D) images using X-ray microtomography. A large set of properties was then computed from this series of 3-D images: density, specific surface area, correlation lengths, mean and Gaussian curvature distributions, air and ice tortuosities, effective thermal conductivity, and intrinsic permeability. Whenever possible, specific attention was paid to assess these properties along the vertical and horizontal directions, and an anisotropy coefficient defined as the ratio of the vertical over the horizontal values was deduced. The time evolution of these properties, as well as their anisotropy coefficients, was investigated, showing the development of a strong anisotropic behavior during the experiment. Most of the computed physical properties of snow were then compared with two analytical estimates (self-consistent estimates and dilute beds of spheroids) based on the snow density, and the size and anisotropy of the microstructure through the correlation lengths. These models, which require only basic microstructural information, offer rather good estimates of the properties and anisotropy coefficients for our experiment without any fitting parameters. Our results highlight the interplay between the microstructure and physical properties, showing that the physical properties of snow subjected to a temperature isotropic parameters such as the density and require more refined information. Furthermore, this study constitutes a detailed database on the evolution of snow properties under a temperature gradient, which can be used as a guideline and a validation tool for snow metamorphism models at the microor macroscale. © Author(s) 2014.
学科领域	anisotropy; computer simulation; Gaussian method; isotropy; metamorphism; microstructure; numerical model; physical property; snow; temperature gradient; three-dimensional modeling
语种	英语
scopus关键词	anisotropy; computer simulation; Gaussian method; isotropy; metamorphism; microstructure; numerical model; physical property; snow; temperature gradient; 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/120001
作者单位	Météo-France - CNRS, CNRM - GAME UMR3589, CEN, Saint Martin d'Hères, 38400, France; Univ. Grenoble Alpes, 3SR, Grenoble, 38000, France; CNRS, 3SR, Grenoble, 38000, France
推荐引用方式 GB/T 7714	Calonne N.,Flin F.,Geindreau C.,et al. Study of a temperature gradient metamorphism of snow from 3-D images: Time evolution of microstructures, physical properties and their associated anisotropy[J],2014,8(6).
APA	Calonne N.,Flin F.,Geindreau C.,Lesaffre B.,&Rolland Du Roscoat S..(2014).Study of a temperature gradient metamorphism of snow from 3-D images: Time evolution of microstructures, physical properties and their associated anisotropy.Cryosphere,8(6).
MLA	Calonne N.,et al."Study of a temperature gradient metamorphism of snow from 3-D images: Time evolution of microstructures, physical properties and their associated anisotropy".Cryosphere 8.6(2014).