The aerodynamic roughness length of fresh snow
The aerodynamic roughness length of fresh snow
This study presents the results from a series of wind-tunnel experiments designed to investigate the aerodynamic roughness length z 0 of fresh snow under no-drift conditions. A two-component hot-film anemometer was employed to obtain vertical profiles of velocity statistics in a zero pressure gradient turbulent boundary layer for flow over naturally deposited snow surfaces. The roughness of these snow surfaces was measured by means of digital photography to capture characteristic length scales that can be related to z 0. Our results show that, under aerodynamically rough conditions, the mean value of the roughness length for fresh snow is [z0] = 0.24z0=024 mm with a standard deviation ?(z 0) = 0.05 mm. In this study, we show that variations in z 0 are associated with variations in the roughness geometry. The roughness measurements suggest that the estimated values of z 0 are consistent with the presence of irregular roughness structures that develop during snowfalls that mimic ballistic deposition processes
21-34
Gromke, C.
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Manes, C.
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Walter, B.
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Lehning, M.
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Guala, M.
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October 2011
Gromke, C.
c43e10af-66a1-40f2-bba3-1ab554ff3719
Manes, C.
7d9d5123-4d1b-4760-beff-d82fe0bd0acf
Walter, B.
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Lehning, M.
72ba397f-301c-476f-83b0-d37f7620731e
Guala, M.
f5c0d890-4ebc-419e-8fad-00f765277195
Gromke, C., Manes, C., Walter, B., Lehning, M. and Guala, M.
(2011)
The aerodynamic roughness length of fresh snow.
Boundary-Layer Meteorology, 141 (1), .
(doi:10.1007/s10546-011-9623-3).
Abstract
This study presents the results from a series of wind-tunnel experiments designed to investigate the aerodynamic roughness length z 0 of fresh snow under no-drift conditions. A two-component hot-film anemometer was employed to obtain vertical profiles of velocity statistics in a zero pressure gradient turbulent boundary layer for flow over naturally deposited snow surfaces. The roughness of these snow surfaces was measured by means of digital photography to capture characteristic length scales that can be related to z 0. Our results show that, under aerodynamically rough conditions, the mean value of the roughness length for fresh snow is [z0] = 0.24z0=024 mm with a standard deviation ?(z 0) = 0.05 mm. In this study, we show that variations in z 0 are associated with variations in the roughness geometry. The roughness measurements suggest that the estimated values of z 0 are consistent with the presence of irregular roughness structures that develop during snowfalls that mimic ballistic deposition processes
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Published date: October 2011
Organisations:
Energy & Climate Change Group
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Local EPrints ID: 204125
URI: http://eprints.soton.ac.uk/id/eprint/204125
ISSN: 0006-8314
PURE UUID: 0845e3a9-702f-4748-a091-0402ffc433c3
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Date deposited: 24 Nov 2011 15:16
Last modified: 14 Mar 2024 04:30
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Author:
C. Gromke
Author:
C. Manes
Author:
B. Walter
Author:
M. Lehning
Author:
M. Guala
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