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Open AccessArticle

Modeling the Application Depth and Water Distribution Uniformity of a Linearly Moved Irrigation System

Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
Author to whom correspondence should be addressed.
Water 2019, 11(4), 827;
Received: 19 March 2019 / Revised: 12 April 2019 / Accepted: 17 April 2019 / Published: 19 April 2019
(This article belongs to the Special Issue Advances in Hydraulics and Hydroinformatics)
PDF [2921 KB, uploaded 25 April 2019]


A model of a linearly moved irrigation system (LMIS) has been developed to calculate the water application depth and coefficient of uniformity (CU), and an experimental sample was used to verify the accuracy of the model. The performance testing of the LMIS equipped with 69-kPa and 138-kPa sprinkler heads was carried out in an indoor laboratory. The LMIS was towed by a winch with a 1.0 cycle/min pulsing frequency while operating at percent-timer settings of 30, 45, 60, 75, and 90%, corresponding to average moving speeds of 1.5, 2.3, 3.3, 4.0, and 4.7 m min−1, respectively. The application depth and CU obtained under various speed conditions were compared between the measured and model-simulated data. The model calculation accuracy was high for both operating pressures of 69 and 138 kPa. The measured application depths were much larger than the triangular-shaped predictions of the simulated application depth and were between the parabolic-shaped predictions and the elliptical-shaped predictions of the simulated application depth. The results also indicate that the operating pressure and moving speed were not significant factors that affected the resulting CU values. For the parabolic- and elliptical-shaped predictions, the deviations between the measured and model-simulated values were within 5%, except for several cases at moving speeds of 2.3 and 4.0 m min−1. The measured water distribution pattern of the individual sprinklers could be represented by both elliptical- and parabolic-shaped predictions, which are accurate and reliable for simulating the application performances of the LMIS. The most innovative aspect of the proposed model is that the water application depths and CU values of the irrigation system can be determined at any moving speed. View Full-Text
Keywords: linearly moved irrigation system; application depth; moving speed; uniformity coefficient linearly moved irrigation system; application depth; moving speed; uniformity coefficient

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Liu, J.; Zhu, X.; Yuan, S.; Fordjour, A. Modeling the Application Depth and Water Distribution Uniformity of a Linearly Moved Irrigation System. Water 2019, 11, 827.

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