Kinetic energy in sprinkler irrigation: different sources of drop diameter and velocity |
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Authors: | C Bautista-Capetillo M Zavala E Playán |
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Institution: | (1) Planeaci?n de Recursos Hidr?ulicos, Universidad Aut?noma de Zacatecas, 98000 Zacatecas, Mexico;(2) Department of Soil and Water, Aula Dei Experimental Station, CSIC, P. O. Box 13034, 50080 Zaragoza, Spain |
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Abstract: | Sprinkler kinetic energy has been linked to a number of problems in irrigated fields. This work presents the characterization
of sprinkler drop kinetic energy and specific power from low-speed photographic drop data using a commercial impact sprinkler
and three operating pressures. The spatial variability of specific power (W m−2) was assessed for different sprinkler spacings, showing different patterns in rectangular and triangular spacings. The specific
power uniformity coefficient ranged from 38–77%, depending on sprinkler spacing and operating pressure. An attempt was made
to characterize specific power from estimated (measured diameter and estimated velocity) and simulated data (using a ballistic
model). While estimated data produced adequate results, simulated data resulted in a large overestimation. Discrepancies in
kinetic variables between measured and simulated drop data permit to conclude that it is important to continue experimental
drop characterization efforts as well as sprinkler simulation model development. |
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