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Statistical properties of fresh snow roughness

Manes, C., Guala, M., Löwe, H., Bartlett, S.J., Egli, L. and Lehning, M. (2008) Statistical properties of fresh snow roughness Water Resources Research, 44, p. 11407.

Record type: Article


We present results from a series of experiments in which fresh snow roughness was measured by means of digital photography and analyzed using the random field approach. The aim of the paper is to investigate the scaling properties of fresh-snow-covered surfaces and to capture key roughness length scales which can characterize the surface geometry and the size of the snow crystals. Results from our experiments show the following: (1) fresh snow roughness exhibits two distinguished scaling regimes, one at scales comparable with the crystals size and another one at larger scales; (2) we confirm that the large scales are built up during snowfall and their scaling behavior is consistent with that of Ballistic Deposition (BD) processes; and (3) we suggest that the crossover length scale separating the two scaling regimes effectively defines a representative length scale of the aggregated snow crystals on the surface. The definition of this length scale is independent of the difficulties associated with measuring snow grain sizes by means of standard microscopic analysis of disaggregated crystals. Furthermore it can be obtained from a low-cost and quick experimental procedure. Results from this study provide a plausible justification for the wide scatter of aerodynamic roughness length values encountered in the literature for fresh snow. Moreover, they provide insight on the key roughness length scales which should be used for the modeling of this parameter.

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Published date: November 2008
Organisations: Agents, Interactions & Complexity, Electronics & Computer Science


Local EPrints ID: 271556
ISSN: 0043-1397
PURE UUID: 9a0eab40-994b-422a-a733-38080c084cd3

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Date deposited: 17 Sep 2010 20:28
Last modified: 18 Jul 2017 06:41

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Author: C. Manes
Author: M. Guala
Author: H. Löwe
Author: S.J. Bartlett
Author: L. Egli
Author: M. Lehning

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