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Improving Drop Size and Velocity Estimates of an Optical Disdrometer: Implications for Sprinkler Irrigation Simulation

AutorBurguete Tolosa, Javier ; Playán Jubillar, Enrique ; Montero, J.; Zapata Ruiz, Nery
Palabras claveDisdrometer
ballistic model
Fecha de publicación2007
EditorAmerican Society of Agricultural and Biological Engineers
CitaciónTransactions of the ASABE 50 (6): 2103-2116 (2007)
ResumenOptical disdrometers measure the attenuation of an infrared beam when water drops 6 pass between the emitter and the receptor. The duration and intensity of the attenuation 7 are used to estimate drop size and time of passage. These variables are used to calibrate 8 and validate ballistic sprinkler simulation models. Two experimental problems affect the 9 quality of the measurements: first, drops can pass through a side of the detector, so that 10 only part of the drop attenuates the luminous flow; and second, several drops can overlap 11 as they pass through the beam. This work presents a statistical treatment of the observed 12 time of passage that can be used to eliminate a large part of the erroneous measurements, 13 significantly improving the accuracy of disdrometer data. Furthermore, drop velocities 14 can be estimated from the corrected times of passage. Simulation with the ballistic 15 model shows that the minimum drop size accurately measured by the disdrometer is 16 too large to characterize the fine diameters typical of drops landing close to the emitter. 17 For further landing distances, the discrepancies between measurements and simulations 18 using ballistic theory can be large. Differences in drop velocity, drop size and maximum 19 sprinkler reach are discussed in the paper. From our results, it can be concluded that 20 the ballistic model (assuming independent movement of drops) constitutes an excessive 21 simplification of reality. We believe that group displacement of the drops, resulting in a reduced air drag and in an increased probability of drop collision, 22 is responsible for a 23 relevant part of the reported differences.
Descripción41 Pag., 14 Fig., 3 Tabl. The definitive version is available at: http://asae.frymulti.com/toc.asp
Versión del editorhttp://asae.frymulti.com/abstract.asp?aid=24112&t=2
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