The GDS model - a rapid computational technique for the calculation of aircraft spray drift buffer distances

Article


Craig, Ian. 2004. "The GDS model - a rapid computational technique for the calculation of aircraft spray drift buffer distances." Computers and Electronics in Agriculture. 43 (3), pp. 235-250. https://doi.org/10.1016/j.compag.2004.02.001
Article Title

The GDS model - a rapid computational technique for the calculation of aircraft spray drift buffer distances

ERA Journal ID41630
Article CategoryArticle
Authors
AuthorCraig, Ian
Journal TitleComputers and Electronics in Agriculture
Journal Citation43 (3), pp. 235-250
Number of Pages16
Year2004
PublisherElsevier
Place of PublicationNetherlands
ISSN0168-1699
Digital Object Identifier (DOI)https://doi.org/10.1016/j.compag.2004.02.001
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0168169904000328
Abstract

[Abstract]: A model for predicting the required spray drift buffer distance for a specified off target deposition level is described. The GDS model is based upon Gaussian diffusion and sedimentation of particles originating from an elevated instantaneous line source. Aircraft-induced near wake effects are ignored. Agreement between aircraft wake models FSCBG, AgDRIFT and the GDS model is reasonable for downwind distances greater than 50m. The model has the advantage over Lagrangian models in that it is faster computationally and can readily provide real time prediction in the cockpit over large distances (3 km). A sensitivity analysis has been performed on the model to elucidate the effects of the primary parameters on spray drift. The model has proved useful in the determination of spray drift buffer distances for regulatory purposes and in the development of appropriate spray drift management systems for aerial spraying. Further research work is required to refine the model to better account for air stability effects, collector type, evaporation and crop canopy.

Keywordsspray drift, Gaussian diffusion, sedimentation, buffer distance
ANZSRC Field of Research 2020401199. Environmental engineering not elsewhere classified
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Byline AffiliationsDepartment of Agricultural, Civil and Environmental Engineering
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