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Computation of 3D curvatures on a wet snow sample

Published online by Cambridge University Press:  15 July 1999

J. B. Brzoska ,
B. Lesaffre ,
C. Coléou ,
K. Xu  and
R. A. Pieritz
J. B. Brzoska*
Affiliation:
Météo-France, CNRM/Centre d'Études de la Neige, 1441 rue de la Piscine, 38406 St Martin d'Hères, France
B. Lesaffre*
Affiliation:
Météo-France, CNRM/Centre d'Études de la Neige, 1441 rue de la Piscine, 38406 St Martin d'Hères, France
C. Coléou*
Affiliation:
Météo-France, CNRM/Centre d'Études de la Neige, 1441 rue de la Piscine, 38406 St Martin d'Hères, France
K. Xu
Affiliation:
Laboratoire de Physique des phénomènes de Transport et de Mélange (Centre d'Études de la Neige), Bd3, Téléport2, B.P. 79, 86960 Futuroscope, France
R. A. Pieritz*
Affiliation:
Laboratoire d'Études des Transferts en Hydrologie et Environnement, B.P. 53, 38041 Grenoble Cedex 9, France
*
[email protected] [email protected] [email protected] [email protected]
[email protected] [email protected] [email protected] [email protected]
[email protected] [email protected] [email protected] [email protected]
[email protected] [email protected] [email protected] [email protected]
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Abstract

The map of 3D curvatures of a porous medium characterizes most of its capillary properties. A model for directly computing curvatures from athree-dimensional image of the solid matrix of a porous medium is presented. Aprecise distance map of the object is built using the “chamfer” distance of discretegeometry. The set of local maxima of the distance map is used for quick location ofthe normal to each point P of the object's surface. The normal being known,principal radii of curvature are computed in 2D and lead to 3D curvature. This modelwas validated on geometric shapes of known curvature, then applied on a natural snowsample. The snow image was obtained from a serial cut (performed in cold laboratory)observed under specularly reflected light. Views of both fresh and sublimated sectionswere taken for each of the 64 section planes: this allowed easier distinction betweensnow and filling medium and made possible automatic contouring of section planeimages. Curvature maps computed from pore and grain phases respectively were found tobe in excellent agreement for each tested object shape, including the snow sample.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 7 , Issue 1 , July 1999 , pp. 45 - 57
Copyright
© EDP Sciences, 1999

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References

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