The entrapment of particles by windbreaks

Raupach, MR, Woods, N, Dorr, G, Leys, JF and Cleugh, HA (2001) The entrapment of particles by windbreaks. Atmospheric Environment, 35 July 2001: 3373-3383. doi:10.1016/S1352-2310(01)00139-X


Author Raupach, MR
Woods, N
Dorr, G
Leys, JF
Cleugh, HA
Title The entrapment of particles by windbreaks
Journal name Atmospheric Environment   Check publisher's open access policy
ISSN 1352-2310
Publication date 2001-01-01
Sub-type Article (original research)
DOI 10.1016/S1352-2310(01)00139-X
Open Access Status Not yet assessed
Volume 35
Issue July 2001
Start page 3373
End page 3383
Total pages 11
Place of publication Oxford
Publisher Pergamon-Elsevier Science Ltd
Language eng
Subject C1
309901 Fertilisers and Agrochemicals (Application etc.)
620500 Sustainable Plant Production Systems
Abstract A theory is developed for calculating the entrapment of particles by a windbreak, with four results. (1) The fraction of particles in the oncoming flow which pass through the windbreak, or transmittance of the windbreak for particles (sigma), is related to the optical porosity (tau). The very simple approximation sigma=tau works well for most applications involving the interception of spray droplets by windbreaks. Results from a field experiment agree with the theoretical predictions. (2) A new equation for the bulk drag coefficient of a windbreak is tested against numerical, wind tunnel and field experiments. This enables the bleed velocity for the flow through the windbreak to be predicted in terms of the screen pressure coefficient (k) of the barrier. (3) The relationship between k and tau is different for a vegetative barrier than for a screen across a confined duct, implying a lower Fc for given tau. (4) The total deposition of particles to a windbreak is determined by a trade-off between particle absorption and throughflow, implying an optimum value of tau for maximum total deposition. For particles larger than 30 mum and vegetation elements smaller than 30 mm, this occurs near tau = 0.2. (C) 2001 Elsevier Science Ltd. All rights reserved.
Keyword Particle Deposition
Spray Deposition
Vegetation
Shelter
Porosity
Environmental Sciences
Meteorology & Atmospheric Sciences
Dry Deposition
Flow
Velocity
Q-Index Code C1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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Created: Wed, 15 Aug 2007, 02:41:19 EST