RT article
T1 LIDAR as an alternative to passive collectors to measure pesticide spray drift
A1 Gregorio, Eduard
A1 Rosell-Polo, J. R.
A1 Sanz, Ricardo
A1 Rocadenbosch, Francesc
A1 Solanelles, Francesc
A1 Garcerá, Cruz
A1 Chueca, Patricia
A1 Arno, Jaume
A1 del Moral, Ignacio
A1 Masip, Joan
A1 Camp, Ferran
A1 Viana, Rafael
A1 Escola, Alexandre
A1 Gracia, Felip
A1 Planas, Santiago
A1 Moltó, Enrique
AB Pesticide spray drift entails a series of risks and costs in terms of human, animal and environmental wellbeing. A proper understanding of this phenomenon is essential to minimise these risks. However, most conventional methods used in drift measurement are based on point collectors which are unable to obtain information concerning the temporal or spatial evolution of the pesticide cloud. Such methods are also costly, labour-intensive, and require a considerable amount of time. The aim of this paper is to propose a method to measure the spray drift based on lidar (Light Detection And Ranging) and to prove that it can be an alternative to passive collectors. An analytical model is proposed to relate the measurements obtained through passive collectors and those obtained with lidar systems considering several spray application and meteorological parameters. The model was tested through an experimental campaign involving multiple ground spray tests. A lidar system and two types of passive collectors (nylon strings and water-sensitive paper) were used simultaneously to measure the drift. The results showed for each test a high coefficient of determination (R-2 approximate to 0.90) between the lidar signal and the tracer mass captured by the nylon strings. This coefficient decreased (R-2 = 0.77) when all tests were considered together. Lidar measurements were also used to study the evolution of the pesticide cloud with high range (1.5 m) and temporal resolution (1 s) and to estimate its velocity. Furthermore, a very satisfactory adjustment (R-2 = 0.89) was observed between the tracer mass collected by the nylon lines and the coverage on water-sensitive paper sheets. These results are in accordance with the proposed analytical model and allow the conclusion that the application and meteorological parameters can be considered spatially invariant for a given test but are not invariant for different tests. C) 2013 Elsevier Ltd. All rights reserved.
SN 1352-2310
YR 2014
FD 2014
LK http://hdl.handle.net/20.500.11939/5334
UL http://hdl.handle.net/20.500.11939/5334
LA en
NO Gregorio, Eduard, Rosell-Polo, J.R., Sanz, R., Rocadenbosch, Francesc, Solanelles, Francesc, Garcerá, C., Chueca, P., Arno, Jaume, del Moral, I., Masip, Joan, Camp, Ferran, Viana, Rafael, Escola, Alexandre, Gracia, Felip, Planas, Santiago, Moltó, E. (2014). LIDAR as an alternative to passive collectors to measure pesticide spray drift. Atmospheric Environment, 82, 83-93.
DS MINDS@UW
RD Jan 20, 2021