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Wind spatial variability in an irrigation district of Aragón (Spain)

AuthorsSánchez Marcos, Ignacio; Zapata Ruiz, Nery ; Martínez-Cob, Antonio
Spatial variability
Issue DateApr-2006
CitationInternational Symposium on Water and Land Management for Sustainable Irrigated Agriculture (Adana, Turquía. 4-7 abril 2006)
AbstractIrrigation management in sprinkler irrigated districts, where wind events are frequent and extended, should be carried out considering the wind speed due to its important effects on sprinkler uniformity and efficiency. This study surveys the spatial variability of wind speed and its influence on the sprinkler irrigation results at the Irrigation District of Montesnegros, located in the NE of Spain, in the provinces of Zaragoza and Huesca (Aragon), and classified as windy. At the moment, only one meteorological station of the SIAR net (Irrigating Agriculture-Weather Information System of the Spanish Agriculture Ministry) located in the irrigation district supplies the weather reports. This paper will attempt to study if these reports are representative for all the district area, according to irrigation performance indexes. WAsP model was used to estimate the wind distribution at 13 different points within the Irrigation District. Wind data from the SIAR station for the period August 13th 2003 to August 13th 2005 were used to this estimation. To check the WAsP results, using cup anemometers, continuous measurements during at least 24 h were recorded at those 13 sites. To determine whether the SIAR met reports are representative in the district territory, four irrigation designs, two sprinklers and two triangular spacings, and the pressure at sprinkler nozzle, were pre-defined. Using ADOR-Sprinkler, a solid-set model based on ballistic theory, the wind speeds modelled at these 13 sites for the 2003-2005 period were translated into parameters of uniformity and efficiency that were compared. A second aim was to calculate the percentage of suitable time for irrigation. It was compared the number of suitable hours whether 13 different wind distributions were considered or only that from the SIAR station. The suitable time for irrigation was determined according to four management strategies: One based on a wind threshold (<3 m/s) and three others based on the irrigation performance parameters Christiansen Uniformity Coefficient CUC and Wind Drift Evaporation Losses WDEL (CUC³84% and WDEL≤20% for the standard, CUC³90% and WDEL≤15% for the restrictive and CUC³80% and WDEL≤25% for the relaxed).
Description14 Pags.- 6 Tabls.- 3 Figs.
Appears in Collections:(EEAD) Comunicaciones congresos
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