Investigation of water volume controller emitter effect on water distribution uniformity in micro-irrigation systems

Author

Urmia University

Abstract

The performance of existence emitters in micro irrigation systems is on the basis of pressure dissipation and their inefficiency in the pressure regulation and discharge uniformity has been reported by researchers. In this research, in order to improve emitters' efficiency in micro irrigation systems, new emitters named water volume controller emitters were designed and evaluated. One hundred emitters were installed in the field conditions on a micro irrigation system and the exiting water volume was measured until cutoff time. The cutoff time of the emitters were measured with three repetitions at the pressures of 0.5, 1, 1.5, 2 and 2.5 Atm in five positions including the first, third, mid, two-thirds and end of lateral pipe. Finally, the obtained results were evaluated on the basis of ASAE standards. In the field experiments and in the pressure of 0.5 Atm, the maximum value of coefficient of variation was obtained 3.3% which was evaluated in the excellent category in the all applied pressures. Also, at the minimum pressure, the coefficients of distribution uniformity and emission uniformity were obtained 97.6% and 91% respectively, so that the mentioned values had minimum values. In all pressure-discharge equation, the pressure exponent was approximately estimated 0.55. The type of flow in emitters was turbulent. The appropriate performance of the mentioned emitters in creating water distribution uniformity showed that the change of view about emitters' mechanism and the developing new emitters with efficient mechanism can improve the efficiency of micro irrigation systems.

Keywords

References

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Water and Soil Science
Volume 30, Issue 1
May 2020
Pages 97-108

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