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The spatial variability of the wind in a sprinkler irrigated district: Implications for irrigation management

AuthorsSánchez Marcos, Ignacio; Zapata Ruiz, Nery ; Faci González, José María ; Martínez-Cob, Antonio
water losses
Issue DateMay-2011
CitationSánchez I, Zapata N, Faci JM, Martínez-Cob A. The spatial variability of the wind in a sprinkler irrigated district: Implications for irrigation management. Biosystems Engineering 109 (1): 65-76 (2011)
AbstractThe spatial variability of the wind in the Montesnegros Irrigation District (MID), in Spain, has been analysed. From a wind series (2004–2007) registered by a reference weather station, a windspeed >2 m s−1 was observed about 50% of the time. During these periods about 70% of the time it blew from the northwest (known as the Cierzo). Wind was monitored at the reference site and at 17 sites throughout the MID. Using regression a series of the local wind velocities for the irrigation seasons 2004–2007 were estimated from the reference station data. Wind exposure for 39% of the MID area was found to be similar to that of the reference site; 25% were less exposed and 36% considerably more exposed. The spatial variability of the wind was used to calculate the suitable time for irrigation (STI, %) using Ador-Sprinkler software. STI was simulated for different irrigation systems and strategies: standard – Christiansen’s uniformity coefficient (CUC) > 84% and wind drift and evaporation losses (WDEL) ≤ 20%, restrictive – CUC ≥ 90% and WDEL ≤ 15% and relaxed – CUC > 80% and WDEL ≤ 25%. At the reference site, STI varied from 50 to 56% of the total time during the irrigation season time for standard strategy, from 68 to 77% for the relaxed strategy and 8 to 30% for the restrictive strategy. Excluding the restrictive strategy, the least exposed sites averaged 14% greater STI than the most exposed sites.
Description39 Pag., 8 Fig., 4 Tabl. The definitive version is available at: http://www.sciencedirect.com/science/journal/15375110
Publisher version (URL)http://dx.doi.org/10.1016/j.biosystemseng.2011.02.003
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