Analysis of Distribution Uniformity to Optimize Design in Semi-Portable Sprinkler Irrigation System

Document Type : Research Paper

Author

Senior Expert of Irrigation and Drainage Engineering

Abstract

The purpose of this study was to determine optimum values of  main factors affecting uniformity (i.e. water pressure, sprinklers shape and spacing) in semi-portable sprinkler irrigation system under different wind speed conditions. The standard ISO 7749/2 was taken into account to determine uniformity. The field test was conducted under single sprinkler condition in south-east region of Khouzestan Province. Results showed that uniformity decreased as wind speed and working pressure increased. According to the results of the investigations, in order to obtain acceptable uniformity (80%), the most suitable sprinkler spacing is 2525m with square-shaped when wind speed are higher than 2m.s-1. Uniformity decreased from 80 percent when wind speed exceeded 15 km.hr-1. Therefore, sprinkler irrigation is not recommended in this condition.

Keywords


  1. احسانی، م. خالدی، ه. 1382. شناخت و ارتقای بهره وری آب کشاورزی به منظور تأمین امنیت آبی و غذایی کشور. مجموعه مقالات یازدهمین همایش کمیته ملی آبیاری و زهکشی ایران.
  2. شیخ اسماعیلی، الف. 1382. بررسی یکنواختی توزیع آب و تلفات تبخیر و باد در سیستم آبیاری بارانی کلاسیک ثابت با آبپاش متحرک A-D-5 . پایان نامه کارشناسی ارشد. دانشکده کشاورزی. دانشگاه شهید چمران اهواز.
  3. American Society of Agricultural Engineers, Standards - ASAE, S398.1 . 2001. Procedure for Sprinkler Testing and Performance Reporting.
  4. Christiansen, J.E. 1942. Irrigation by sprinkling. California Exp. Stn. Bull. 670. University of California, Berkeley.
  5. ISO-7749/1. 1986. part 1. Design and operational requirements. Agricultural Irrigation Equipment-Rotating Sprinklers.
  6. ISO-7749/2. 1990. part 2. Uniformity of distribution and test methods. Agricultural Irrigation Equipment-Rotating Sprinklers.
  7. Keller, J. 1983. USDA-SCS, national engineering handbook section 15. Irrigation, Sprinkler Irrigation.
  8. Keller, J. and Bliesner, R.D. 1990. Sprinkler and trickle irrigation. AVI Book. Van Nostrand Reinhold. New York, USA
  9. Montero, J.; Tarjuelo, J.M. and Ortega, J.F. 2000. Heterogeneity analysis of the irrigation in fields with medium size sprinklers. Cigr Journal. Vol. II. pp. 1130-1140.
  10. Pair, C.H. 1968. Water distribution under sprinkler Irrigation. Trans. ASAE. 11(5): 648-651.
  11. Phocaides, A. Technical handbook on pressurized irrigation techniques. Food and Agriculture Organization of the United Nations -FAO. pp. 101.
  12. Seginer, and Kostrinsky, M. 1975. Wind sprinkler patterns and system design. Journal of Irrigation and Drainage Division. ASCE. 101(TR4): pp. 251-264.
  13. Solomon, H. 1990. Sprinkler irrigation uniformity. Irrigation Notes, Publication of California Agriculture Technology Institute (CATI). No. 900803: pp. 3-4.
  14. Tarjuelo, J. 1992. Working condition of sprinkler to optimize application of water. Journal of Irrigation and Drainage Engineering. 118(6): 895-913.