Friction Head Loss in Center-Pivot Laterals with Single Diameter and Multidiameter
Publication: Journal of Irrigation and Drainage Engineering
Volume 140, Issue 10
Abstract
In this paper, efficient closed form expressions to compute the friction head loss in center-pivot laterals using the method of the discrete outflow distribution are presented. The results are applicable to center-pivot systems with single diameter and multidiameter, with constant spacing between sprinklers along the lateral, with and without end gun sprinklers, and with and without closed outlets at the beginning of the lateral. The head loss between the last outlet and the end gun, usually neglected in the existing literature, is explicitly considered. The values of the friction head loss along the lateral obtained with the discrete outflow distribution are compared with those obtained with the continuous outflow distribution and with other expressions available in the literature. The proposed expressions provide a more general description of head loss and lead to more accurate results.
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References
Alazba, A. A. (2005). “Calculating F factor for center-pivots using simplified formula and modified Cristiansen equation.” J. King Saud. Univ., Agric. Sci., 17(2), 85–99.
Anwar, A. A. (1999). “Friction correction factors for center-pivots.” J. Irrig. Drain. Eng., 280–286.
Anwar, A. A. (2000). “Friction correction factors for center-pivots with end guns.” J. Irrig. Drain. Eng., 113–118.
Keller, J., and Bliesner, R. D. (1990). Sprinkle and trickle irrigation, Chapman and Hall, New York.
Mathematica version 6.0 (2007). [Computer software]. Wolfram Research, Champaign, IL.
Reddy, J. M., and Apolayo, H. (1988). “Friction factor for center-pivot irrigation systems.” J. Irrig. Drain. Eng., 183–185.
Sadeghi, S. H., and Peters, T. (2013). “Adjusted friction correction factors for center-pivots with and-gun.” Irrig. Sci., 31(3), 351–358.
Scaloppi, E. J., and Allen, R. G. (1993). “Hydraulics of irrigation laterals: Comparative analysis.” J. Irrig. Drain. Eng., 91–115.
Tabuada, M. A. (2011). “Hydraulics center-pivot laterals: A complete analysis of friction head loss.” J. Irrig. Drain. Eng., 513–523.
Valiantzas, J. D., and Dercas, N. (2005). “Hydraulic analysis of the multidiameter center-pivot sprinkler laterals.” J. Irrig. Drain. Eng., 137–146.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 140 • Issue 10 • October 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Nov 14, 2013
Accepted: Apr 1, 2014
Published online: May 29, 2014
Published in print: Oct 1, 2014
Discussion open until: Oct 29, 2014
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