Improving irrigation Performance by managing the irrigation cut-off time in SIRMOD (Case Study: Moghan Agro-Industry and Husbandry)

Document Type : Research Paper

Authors

1 University of Tehran

2 University of Mohaghegh Ardebili

3 Imam Khomeini International University

Abstract

There are several mathematical models with different solutions for evaluating surface irrigation; one of these models is SIRMOD. In this study, the evaluation indices were analyzed using SIRMOD. In each study field after pertaining field experiments, factors such as inlet discharge, cutoff time, advance and rollback time, infiltration characteristics, geometry of furrow, field length, land slope, and soil moisture were measured and used as model inputs. The water application efficiency was also determined for the current status. Two different solutions were applied for improving the water application efficiency in the study fields; first, cutting off the flow as soon as water reaches the end of the furrow (first scenario), and second, cutting off the flow before water reaches the end of the furrow (second scenario) and then the simulation was executed for the second time. According to the SIRMOD simulation, the average water application efficiency was increased from 35% to 61% for the first scenario and 75% for the second scenario. Results of both scenarios in SIRMOD showed that these two approaches could improve the irrigation Performance of surface irrigation and offer a cut-off time for management of irrigation by farmers.

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References

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Iranian Journal of Soil and Water Research
Volume 48, Issue 4
Dec. and Jan
December 2017
Pages 811-822

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