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  4. Modelling Small-Scale Drifting Snow with a Lagrangian Stochastic Model Based on Large-Eddy Simulations
 
research article

Modelling Small-Scale Drifting Snow with a Lagrangian Stochastic Model Based on Large-Eddy Simulations

Zwaaftink, C. D. Groot
•
Diebold, M.  
•
Horender, S.
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2014
Boundary-Layer Meteorology

Observations of drifting snow on small scales have shown that, in spite of nearly steady winds, the snow mass flux can strongly fluctuate in time and space. Most drifting snow models, however, are not able to describe drifting snow accurately over short time periods or on small spatial scales as they rely on mean flow fields and assume equilibrium saltation. In an attempt to gain understanding of the temporal and spatial variability of drifting snow on small scales, we propose to use a model combination of flow fields from large-eddy simulations (LES) and a Lagrangian stochastic model to calculate snow particle trajectories and so infer snow mass fluxes. Model results show that, if particle aerodynamic entrainment is driven by the shear stress retrieved from the LES, we can obtain a snow mass flux varying in space and time. The obtained fluctuating snow mass flux is qualitatively compared to field and wind-tunnel measurements. The comparison shows that the model results capture the intermittent behaviour of observed drifting snow mass flux yet differences between modelled turbulent structures and those likely to be found in the field complicate quantitative comparisons. Results of a model experiment show that the surface shear-stress distribution and its influence on aerodynamic entrainment appear to be key factors in explaining the intermittency of drifting snow.

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Type
research article
DOI
10.1007/s10546-014-9934-2
Web of Science ID

WOS:000341487000006

Author(s)
Zwaaftink, C. D. Groot
Diebold, M.  
Horender, S.
Overney, J.
Lieberherr, G.
Parlange, M. B.  
Lehning, M.  
Date Issued

2014

Publisher

Springer Verlag

Published in
Boundary-Layer Meteorology
Volume

153

Issue

1

Start page

117

End page

139

Subjects

Drifting snow

•

Lagrangian stochastic model

•

Large-eddy simulations

•

Particle tracking

•

Saltation

•

Surface shear stress

Note

National Licences

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CRYOS  
EFLUM  
Available on Infoscience
October 23, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/107624
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