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Titre :
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Model of water application for pivot sprinkler, II: calibration and results
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Titre original:
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Un modèle d'application d'eau adapté aux asperseurs de pivots, II: calages et résultats
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Auteurs :
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B. Molle ;
Y. Le Gat ;
CEMAGREF AIX EN PROVENCE OIAX ;
CEMAGREF BORDEAUX ORBX
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Type de document :
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article/chapitre/communication
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Editeur :
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New York : ASCE, 2000
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ISBN/ISSN/EAN :
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0733.9437
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Format :
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p. 348-354
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Langues:
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= Anglais
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Mots-clés:
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IRRIGATION PAR ASPERSION
;
ASPERSEUR
;
PIVOT
;
CONDITION D'UTILISATION
;
PERTURBATION PHYSIQUE
;
VENT
;
RESULTAT
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Résumé :
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Présentation des résultats obtenus lors d'un calage d'un modèle probaliste reproduisant les perturbations de la distribution spatiale d'apports d'eau subies par un asperseur en conditions ventées.
A distributional semi-empirical model for the simulation of spatial distribution of water application under centre pivot sprinklers has been developed (Le Gat, Molle 1999). This method describes the probability of water application pattern for a sprinkler using a combination of beta functions. The calibration of this model has been undertaken using laboratory tests conducted in controlled conditions, then in windy conditions. The parameters calibrated are listed. The minimum number of tests needed for calibration has been estimated. The model used can be calibrated from one test in controlled conditions and 3 or 4 tests in windy conditions covering the range of usual wind speeds. Validation should be performed using at least 2 more infield tests. This simulation model of spatial water distribution under sprinklers of centre pivot will be thereafter used to simulate the distribution of water under a typical pivot machine.
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Source :
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Journal of irrigation and drainage engineering, vol.126, no 6, novembre-décembre 2000
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