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- Title
Assessment of straight and meandering furrow irrigation strategies under different inflow rates.
- Authors
Sayari, S.; Rahimpour, M.; Zounemat-Kermani, M.
- Abstract
This paper reports the effect of straight furrow (SF) and meandering furrow (MF) irrigation strategies, as well as inflow rate, on infiltration and hydraulic parameters including advance time, recession time, and runoff hydrograph. The performance of SF and MF irrigation in terms of runoff ratio, deep percolation, and application efficiency was evaluated in 6 furrow fields at Shahid Bahonar University of Kerman, Iran. The required data were collected from the farm, consisting of free drainage furrows with length 70 m, top width 0.8 m, depth 0.25 m, and slope 0.2%. The advance and recession times were significantly longer in MF than SF irrigation. The infiltration was estimated by Lewis-Kostiakov equation. The infiltration coefficients were calculated: The values of k were higher and of a were lower in MF furrows than in SF furrows. The average runoff ratio and application efficiency for the SF irrigation events were 50.53% and 49.07%, respectively, while those of the MF irrigation events were 7.04% and 52.94%, respectively. Based on the results, the velocity of water advance in MF irrigation is decreased and, thus, the runoff, erosion losses, mass of fertilizer lost and surface water contamination were reduced. Using a lower inflow rate and appropriate irrigation time leads to better management outcomes in irrigation systems.
- Subjects
IRAN; FURROW irrigation; IRRIGATION efficiency; WATER pollution; IRRIGATION management; SURFACE contamination; FERTIGATION; MEANDERING rivers; DEFICIT irrigation
- Publication
Water SA, 2019, p685
- ISSN
0378-4738
- Publication type
Article
- DOI
10.17159/wsa/2019.v45.i4.7550