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Effects of a natural windbreak on dust dispersion in the neutral surface layer
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- Author / Creator
- Mao, Yiwen
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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). -
- Subjects / Keywords
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- Graduation date
- Spring 2013
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.