Simulating Sprinkler Performance in Wind
Publication: Journal of Irrigation and Drainage Engineering
Volume 113, Issue 1
Abstract
The uniformity of irrigation systems is important to efficiency, yield, and economics. Wind strongly affects this uniformity. A method is presented for simulating the operation of a sprinkler system in wind. Equations describing the motion of airborne water droplets are shown. The trajectories of water droplets ejected from a sprinkler were numerically computed. Composite results led to predictions of application patterns. Sprinkler droplet size distribution was used to predict the pattern around a sprinkler, and patterns were superimposed to represent a set (not continuously moving) system. Coefficients of uniformity were then computed. The model was validated by comparing predictions with observed application patterns. Individual and multiple sprinkler tests were compared. The simulation system appeared to be an effective predictor of sprinkler performance in wind. Use of this type model can lead to improved sprinkler designs, although variability of the wind vector affects the accuracy of prediction.
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References
1.
ASAE standards 1984. (1984). Amer. Soc. Agr. Engrs., St. Joseph, Mich., 5–496.
2.
Christiansen, J. E. (1942). “Irrigation by sprinkling.” California Agr. Exp. Sta. Res. Bul. 670, Univ. of California, Berkeley, Calif.
3.
Fukui, Y., Nakanishi, K., and Okamura, S. (1980). “Computer evaluation of sprinkler irrigation uniformity.” Irrig. Sci., 2(1), 23–32.
4.
Green, R. L. (1952). “Evaluation of air resistance to freely falling drops of water.” Agr. Engrg., 33(1), 28;
emended, Agr. Engrg. 33(5), 286.
5.
Hornbeck, R. W. (1975). Numerical methods. Quantum Publishers, New York, N.Y.
6.
Kohl, R. A. (1974). “Drop size distribution from medium‐sized agricultural sprinklers.” Trans., ASAE 15(2), 690–693.
7.
Laws, J. O. (1941). “Measurement of falling velocity of water drops and raindrops.” Trans. Am. Geophys. Un. 22, 709–721.
8.
List, R. J. (1966). Smithsonian meteorological tables. Smithsonian Misc. Collections, Vol. 11., Smithsonian Institution, Washington, D.C.
9.
SAS/GRAPH user's guide. (1981). SAS Institute, Inc., Cary, N.C., 43–47.
10.
Seginer, I. (1965). “Tangential velocity of sprinkler drops.” Trans., ASAE, 8(1), 90–93.
11.
Seginer, I., and Kostrinsky, M. (1975). “Wind, sprinkler patterns, and system design.” J. Irrig. Drain. Div., 101(IR4), 251–264.
12.
Solomon, K. (1979). “Variability of sprinkler coefficient of uniformity test results.” Trans., ASAE 22(5), 1078–1080, 1086.
13.
Solomon, K. H., Kincaid, D. C., and Bezdek, J. C. (1985). “Drop size distributions for irrigation spray nozzles.” Trans., ASAE, 28(6), 1966–1974.
14.
Solomon, K. H., and von Bernuth, R. D. (1981). “Droplet size and runoff study.” Unpublished report, VON‐SOL, Claremont, Calif.
15.
Stanhill, B. (1969). “A simple instrument for the field measurement of turbulent diffusion flux.” J. Appl. Meteorol., 8(4) 509–513.
16.
Sutton, I. G. (1953). Micrometeorology, a study of physical processes in the lowest layers of the earth's atmosphere. McGraw‐Hill, Inc., New York, N.Y., 232–241.
17.
Tanner, C. B., and Pelton, W. L. (1960). “Potential evapotranspiration estimates by the approximate energy balance method of Penman.” J. Geophys. Res., 65(10), 3391–3413.
18.
von Bernuth, R. D., and Gilley, J. R. (1984). “Sprinkler droplet size distribution estimation from single leg test data.” Trans., ASAE, 27(5), 1435–1441.
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Copyright © 1987 ASCE.
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Published online: Feb 1, 1987
Published in print: Feb 1987
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