Propriétés physiques et microstructurelles à partir d’images 3D

By using either geometric computations, direct methods or homogeneization techniques on Representative Elementary Volumes (REV) of tomographic data, it is possible to access important macroscale snow properties. Some of them are presented below.

Sommaire

Porosity and density

The Porosity P and Density D can be estimated easily from a 3D Image. P is obtained directly by counting the number of voxels n belonging to the pore phase in a chosen region of interest R. Let N be the total number of voxels belonging to R. If R is sufficiently large, an estimation of P representative of the snow sample is given by the ratio n/N.
Snow density D_snow can be then obtained from the following formula :
D_snow = (1-P) x D_ice, with D_ice = 917 kg m-3.

Main related references :

Coléou, C., B. Lesaffre, J.-B. Brzoska, W. Ludwig and E. Boller, 2001. Three-dimensional snow images by X-ray microtomography, Ann. Glaciol., 32, 75-81, doi : 10.3189/172756401781819418.
Flin, F., J.-B. Brzoska, B. Lesaffre, C. Coléou and R. A. Pieritz, 2004. Three-dimensional geometric measurements of snow microstructural evolution under isothermal conditions, Ann. Glaciol., 38, 39-44, doi : 10.3189/172756404781814942.

Correlation lengths

Main related reference :

Calonne, N., F. Flin, C. Geindreau, B. Lesaffre and S. Rolland du Roscoat, 2014. Study of a temperature gradient metamorphism of snow from 3-D images : time evolution of microstructures, physical properties and their associated anisotropy, The Cryosphere, 8, 2255-2274, doi : 10.5194/tc-8-2255-2014. [ pdf, 6.36 mb] [Auxiliary Materials - pdf, 6.35 mb]

Specific Surface Area

Main related references :

Flin, F., J.-B. Brzoska, B. Lesaffre, C. Coléou and R. A. Pieritz, 2004. Three-dimensional geometric measurements of snow microstructural evolution under isothermal conditions, Ann. Glaciol., 38, 39-44, doi : 10.3189/172756404781814942.
Flin, F., B. Lesaffre, A. Dufour, L. Gillibert, A. Hasan, S. Rolland du Roscoat, S. Cabanes and P. Pugliese, 2011. On the computations of specific surface area and specific grain contact area from snow 3D images, Furukawa, Y., ed., Physics and Chemistry of Ice, Hokkaido University Press, Sapporo, Japan, 321-328. [ pdf, 1002 kb]
Calonne, N., F. Flin, C. Geindreau, B. Lesaffre and S. Rolland du Roscoat, 2014. Study of a temperature gradient metamorphism of snow from 3-D images : time evolution of microstructures, physical properties and their associated anisotropy, The Cryosphere, 8, 2255-2274, doi : 10.5194/tc-8-2255-2014. [ pdf, 6.36 mb] [Auxiliary Materials - pdf, 6.35 mb]

Specific Grain Contact Area

Main related reference :

Flin, F., B. Lesaffre, A. Dufour, L. Gillibert, A. Hasan, S. Rolland du Roscoat, S. Cabanes and P. Pugliese, 2011. On the computations of specific surface area and specific grain contact area from snow 3D images, Furukawa, Y., ed., Physics and Chemistry of Ice, Hokkaido University Press, Sapporo, Japan, 321-328. [ pdf, 1002 kb]