Mercer, Geoff and Roberts, Tony (2005) Predicting the off-site deposition of spray drift from horticultural spraying through porous barriers on soil and plant surfaces. In: MISG 2005: 22nd Mathematics-In-Industry Study Group, 24-28 Jan 2005, Auckland, New Zealand.
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Shelterbelts can be used to capture spray drift from crop spraying and reduce its spread to non crop areas. Critical factors in the efficiency of this capture are the ambient wind velocity, the structure of the shelterbelt and the spray drift droplet distribution. Here we present a model of the flow through and over a shelterbelt. It is found that the flow pattern is largely independent of the ambient wind strength. Settling and evaporation of the spray drift droplets are investigated and critical droplet diameters determined. It is found that droplets larger than 200 microns settle before reaching the shelterbelt and need not be included in the shelterbelt capture calculations. A model of the spray drift collection within the shelterbelt is analysed. Wind speeds between 1 and 5 m/s are considered which is the range that spray operations are usually performed over. Shelterbelts with optical porosities between 10% and 30% and constructed of fine particles such as pine needles are found to perform the best.
|Item Type:||Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)|
|Additional Information:||Also available at http://www.maths-in-industry.org/46/ Please note that the authorship of the published version differs slightly from the preprint version provided in USQ ePrints.|
|Uncontrolled Keywords:||shelterbelts; windbreaks; mathematical models; crop spray drift collection|
|Subjects:||300000 Agricultural, Veterinary and Environmental Sciences > 309900 Other Agricultural, Veterinary and Environmental Sciences > 309999 Agricultural, Veterinary and Environmental Sciences not elsewhere classified
230000 Mathematical Sciences > 239900 Other Mathematical Sciences > 239999 Mathematical Sciences not elsewhere classified
|Depositing User:||epEditor USQ|
|Date Deposited:||11 Oct 2007 00:15|
|Last Modified:||02 Jul 2013 22:30|
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