Author(s): Yasser E. Arafa, Khaled A. Shalabi
Published in: International Journal of Engineering Research & Technology
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Volume/Issue: Volume. 5 - Issue. 05 , May - 2016
Centre pivot irrigation system is a promising and precise system, for increasing the utilization efficiency of unit water. However, Egyptian agricultural-water uses policies for reclaiming and cultivation 1.5 million feddan (625000 ha) had stated center pivot irrigation system as a major irrigation system. Hence, a developed simple-spread sheet module for center pivot irrigation system design has been developed and validated. However, the developed spread-sheet is based on different design criteria, as, crop type, weather data, and soil characteristics. The module comprises five sub-models for: (a) main sub-model; (b) data entry sub-model; (c) weather sub-model; (d) irrigation sub-model; and (e) results sub-model. The most important outputs include nozzle flow rate (m3/h), application rate (mm/h), and throw diameter (m). These outputs (outputs of 9 scenarios) were compared with observed/manufactured data for the calibration and validation of the model. Results of this comparison show that differences in model accuracy owing to different variables affecting the design and management of the center pivot were not significant. The relationships between the observed/manufactured and simulated results have a good correlation with high value of coefficient of determination and the best models are as follows: 1- Nozzle flow rate (m3/h) was in scenario 5 with R2 = 0.967 and explained by an exponential model: Q SIM = 0.1067e4.1131 (Q obs). 2- Throw diameter (m) was in scenario 1 with R2 = 0.942 and explained by a power model: Dw SIM = 3.9064 (Dw MFD)0.4361.
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