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Assessing Sprinkler Irrigation Performance Using Field Evaluations at the Medjerda Lower Valley of Tunisia

AuthorsYacoubi, Samir; Zayani, Khemaies; Slatni, Adel; Playán Jubillar, Enrique CSIC ORCID
KeywordsSprinkler Irrigation
Wind Drift and Evaporation Losses
Wind Speed
Pressure Head
Issue DateOct-2012
CitationYacoubi S, Zayani K, Slatni A, Playán E. Assessing sprinkler irrigation performance using field evaluations at the Medjerda lower valley of Tunisia. Engineering 4 (10): 682-691 (2012)
AbstractIrrigation uniformity and wind drift and evaporation losses (WDEL) are major concerns for the design and management of sprinkler irrigation systems under arid or semi-arid conditions. Field trials were carried out to assess irrigation uniformity and WDEL under various wind velocities, sprinkler spacings and operating pressure heads. Based on experimental data, a frequency analysis was performed to infer the occurrence probability of a given uniformity coefficient (UC). In addition, statistical regressions were used to model WDEL as a function of different climatic variables. Increasing the operating pressure head improved uniformity at low wind speeds. It was shown that UC has been severely impaired at wind speeds above 4 m/s. In the prevailing wind conditions, the frequency analysis showed that a sprinkler spacing of 12 m × 12 m provided the best uniformity. In the local conditions, it is recommended to stop irrigation when wind velocity exceeds 4 m/s. Moreover, it was shown that wind speed and relative humidity were the main significant variables influencing WDEL.
Description10 Pags., 6 Figs., 7 Tabls.
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