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Effect of Pulsating Pressure on Water Distribution and Application Uniformity for Sprinkler Irrigation on Sloping Land

1
Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China
2
College of Water Resource and Architectural Engineering, Northwest A&F University, Yangling 712100, China
*
Author to whom correspondence should be addressed.
Water 2019, 11(5), 913; https://doi.org/10.3390/w11050913
Received: 22 December 2018 / Revised: 24 March 2019 / Accepted: 23 April 2019 / Published: 1 May 2019
(This article belongs to the Section Hydraulics)
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PDF [2821 KB, uploaded 1 May 2019]
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Abstract

Crops are highly susceptible to drought in sloping land. Due to its good adaptability to complex terrain, sprinkler irrigation is one of the commonly used methods for sloping land. To improve water application uniformity for sprinkler irrigation on sloping land, an experiment was conducted on an artificial slope to determine the effects of pulsating versus constant pressure on sprinkler flow rate, radius of throw, water distribution pattern, and water application uniformity. Compared with sprinkler flow rate and water distribution uniformity at constant pressure, sprinkler flow rate was not reduced, but water distribution uniformity for a single sprinkler was improved due to the decreased uphill throw, downhill throw and the ratio of downhill throw to uphill throw at pulsating pressure. The Christiansen Uniformity Coefficient (CU) value of water distribution for a single sprinkler at pulsating pressure was about 10% higher than that of constant pressure. When water distribution of single sprinkler overlapped with rectangular arrangement, CU values for pulsating pressure were on average 4.06% higher than those for constant pressure with different sprinkler spacings. Thus, pulsating pressure is recommended for use in sprinkler irrigation on sloping land to improve water application uniformity. View Full-Text
Keywords: sprinkler irrigation on sloping land; pulsating pressure; constant pressure; water distribution; water application uniformity; radius of throw sprinkler irrigation on sloping land; pulsating pressure; constant pressure; water distribution; water application uniformity; radius of throw
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Zhang, L.; Fu, B.; Ren, N.; Huang, Y. Effect of Pulsating Pressure on Water Distribution and Application Uniformity for Sprinkler Irrigation on Sloping Land. Water 2019, 11, 913.

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