Evaluation of Microirrigation Uniformity on Laterals Considering Field Slopes
Publication: Journal of Irrigation and Drainage Engineering
Volume 136, Issue 6
Abstract
Water application uniformity is an important performance criterion that must be considered during the design and evaluation of the microirrigation systems. This study was conducted to evaluate the water application uniformity considering field slopes. The uniformity parameters including coefficient of variation (CV), Christiansen’s uniformity coefficient (UCC), distribution uniformity (DU), emitter discharge variation expressed by the difference between the maximum emitter flow rate and the minimum emitter flow rate to , emitter discharge variation expressed by the difference between and to design emitter flow rate , emitter discharge variation expressed by the difference between and to average emitter flow rate , emission uniformity expressed by to , and expressed by to . Furthermore, the relationships of CV versus UCC, CV versus DU, CV versus , CV versus , CV versus , CV versus , and CV versus were also discussed. The results of the study revealed that the field slope does not obviously affect the relationships of CV versus UCC, CV versus , and CV versus for any of the slopes evaluated, which include uphill, zero slope, and downhill. Furthermore, the effect of slope on the relationships of CV versus , CV versus , and CV versus was obvious, especially when large downhill slopes with a were considered. However, the effect of slope on the relationships of CV versus DU was intermediate. Taken together, the results of this study indicated that the UCC, , and should be recommend in addition to CV when evaluating the water application uniformity of the microirrigation systems, regardless of slope, and that and should be recommend when evaluating systems placed in fields with a slope of zero or an uphill slope.
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Acknowledgments
This study is supported by National Key Technology R&D Program (UNSPECIFIED2006BAD11B02-03), and part of Project No. UNSPECIFIEDD0706007040191-06 which was supported by the Beijing Municipal Science and Technology Plan, the Knowledge Innovation Project KSCX2-YW-N-003, and the Project for 100 Outstanding Young Scientists (Yaohu Kang) supported by the Chinese Academy of Sciences.CAS
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© 2010 ASCE.
History
Received: Dec 9, 2008
Accepted: Nov 3, 2009
Published online: May 14, 2010
Published in print: Jun 2010
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