Comparison of One-point and Two-point Methods for Estimation of Infiltration Parameters in Furrow Irrigation
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Abstract:
Infiltration is one of the most important hydraulic parameters affecting surface irrigation and one ofthe most difficult parameters in practical field determinations. The infiltration equations are used todescribe water flow hydraulics and surface irrigation systems design. But determination of theparameters in these equations are costly and time consuming. Therefore, some estimating methods areused for this purpose. In this study , three inflow-outflow (as the base method), Shepard et al.’s onepointmethod and Elliot and Walker two-point method were used to determine the parameters of theinfiltration equations. By comparing with the inflow-outflow method, the accuracy of the one pointand two point methods were evaluated for volumetric determination infiltrated water. For this purpose,the collected data from 201C1 and 201E sugarcane farms in Haft-Tappeh with furrow irrigationsystem were analyzed. The data were collected under different inflow rates and furrow lengths. Theresults showed that the Elliot and Walker two-point method with relative errors of 8.08 percent for201C1 farm and 12.85 percent for 201E farm had more accuracy in relation to the Shepard et al.’s onepointmethod with in estimation of cumulative infiltration depth. This method had also moresatisfactory results with relative errors of 4.03 percent and 6.41 percent for 201C1 and 201E farms,respectively.
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Journal title
volume 2 issue 4
pages 83- 96
publication date 2012-06-20
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