WTDISP – adapting a Lagrangian ground sprayer model using wind tunnel data
Date
2009-07
Type
Conference Contribution - published
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Fields of Research
Abstract
The ground boom model (AGriculture DISPersion) or AGDISP calculates the deposition of agrichemicals
both in the area sprayed and more importantly downwind on neighbouring properties. However modelling
the breakup and evaporation of the spray droplet cloud over the first few metres is very difficult. Wind
Tunnel Dispersion or WTDISP arose to overcome this difficulty. Measurements of droplet spectra and fluxes
were made 2 m downwind of several nozzles in a wind tunnel. WTDISP originated as this source was input
into the frame work of the ground boom model AGDISP. AGDISP calculates the deposition by ensemble
averaging the droplet paths to the ground and uses a statistical distribution of the likely paths about these
averages to calculate the deposition on the ground. The paper below also outlines possible ways to improve the technique to model field and wind tunnel
measurements, including turbulence scaling effects, the orientation of the nozzle fan to the wind direction
and field measurements. It also discusses the drop size distribution from both models at 2 m downwind
leading to improvements to the evaporation/breakup algorithms used in AGDISP and gives recommendations
for experiments to improve the model results.
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Copyright © The Authors. The responsibility for the contents of this paper rests upon the authors and not on the Modelling and Simulation Society of Australia and New Zealand Inc.