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Effects of a natural windbreak on dust dispersion in the neutral surface layer Open Access


Other title
natural windbreaks
road dust control
air quality
Type of item
Degree grantor
University of Alberta
Author or creator
Mao, Yiwen
Supervisor and department
Kort, John (Agroforesty Developement Centre of Agriculture and Agri-Food Canada)
Wilson, John (Earth and Atmospheric Science)
Examining committee member and department
Kort, John (Agroforesty Developement Centre of Agriculture and Agri-Food Canada)
Carlos F. Lange (Mechanical Engineering)
Gerhard Reuter (Earth and Atmoshperic Science)
John D. Wilson(Earth and Atmoshperic Science)
Department of Earth and Atmospheric Sciences

Date accepted
Graduation date
Master of Science
Degree level
Field experiments were conducted in Indian Head, Saskatchewan in order to study the effects of a natural shelterbelt (width-to-height ratio W/H = 0.5) on dust dispersion from a gravel road. Transects of dust concentration sensors running normal to the road were placed both in the lee of the windbreak and in an adjacent unsheltered region. A Lagrangian stochastic (LS) model was developed to compute the theoretical ratio (c/Q) of concentration to emission rate and infer time average concentration (c) and the ensemble mean concentration transient. In about 69% of cases the inferred time average concentration lay within a factor of two of the corresponding observations (FAC2 = 69%). The modeled and experimental results suggest that the natural windbreak is not effective in filtering small dust particles (D ≤ 20 μm), but that windbreak entrapment can be a significant mechanism to remove large dust particles (D ≥ 50 μm).
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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