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- Title
Effect of simultaneous variations of Kostiakov–Lewis infiltration coefficients equation in irrigation management on SIRMOD model outputs.
- Authors
Javadi, Ali; Ostad-Ali-Askari, Kaveh; Talebmorad, Hossein
- Abstract
In the management of border irrigation, infiltration function is important for improving irrigation efficiency. The main objective of this research was to evaluate the effect of soil water content management, irrigation water quality, and coefficients of the Kostiakov–Lewis infiltration equation on the output of the SIRMOD model (advance time, application efficiency, irrigation efficiency, Tail-water fraction, Deep percolation fraction, and cumulative infiltration). Treatments used consisted of three irrigation water qualities (EC = 0.6, 3 and 6 dS/m) and two soil water content managements (FC and 30% depletion of FC; FC is field capacity). Using a laboratory method, infiltrations were measured in soil columns for constant water head. Infiltration tests were applied on soil columns after first, fifth, and tenth irrigation events. For the simulation of border irrigation, the coefficients of 18 the modified Kostiakov–Lewis equation obtained from the columns were used. Simulating, two coefficients of the infiltration equation were kept constant, and the other coefficient was changed in the range of 0.25, 0.5, 0.75, 1, 1.25, 1.5, 1.75, and 2 times of the initial value. The result showed that soil sealing was observed only in the 30%FC management which significantly reduced infiltration. Sensitivity analysis showed that increasing the field length increased the parameters changes. Deep percolation fraction and application efficiency were the most affected by changes in infiltration coefficients and irrigation treatments. The output parameters under FC management had the most sensitive to variations in infiltration coefficients especially when the quality of water and soil was poor. Therefore, it is suggested that in the FC management, input parameters of the model are measured with higher precision and entered into the model.
- Subjects
IRRIGATION management; IRRIGATION water quality; SOIL infiltration; FURROW irrigation; IRRIGATION efficiency; SOIL moisture; SOIL crusting
- Publication
Arabian Journal of Geosciences, 2023, Vol 16, Issue 4, p1
- ISSN
1866-7511
- Publication type
Article
- DOI
10.1007/s12517-023-11368-3