Spray drift: An investigation of the relationship between field, wind tunnel measurements and model predictions for determining driftreduction

摘要

This paper reports an investigation of the relationship between wind tunnel and field spray drift data, based on existing field data, and new measurements in the Silsoe wind tunnel. The aim was to explore the ability to use wind tunnel data to deducedrift reduction at distances greater than the 6 m which was the maximum buffer zone in the original LERAP scheme. We conclude that it is very likely that drift reduction will decrease with distance downwind, but wind tunnel measurements can be used to estimate this at least up to 20 m downwind. Possible improvements to the LERAP wind tunnel protocol have been identified, but these will need to take account of how the data will be used in the regulatory process and practical considerations.