Affiliation:
1. Agricultural University of Athens Department of Natural Resources Development and Agricultural Engineering Athens Greece
Abstract
AbstractIn this study, we present new two‐point and one‐point methods for estimating infiltration parameters in furrow irrigation. It is assumed that infiltration and waterfront advance along the furrow follow the Valiantzas two‐parameter infiltration and power advance equations, respectively. The two parameters, the sorptivity (S) and the saturated hydraulic conductivity (Ks), are estimated by solving a quadratic equation. The presented solution of the infiltration‐advance problem is one of the few that uses physically significant parameters (S, Ks), which can provide adequate infiltration and advance behaviour at all time scales. The prediction of infiltration from the proposed methods is compared with experimental data and with the two‐point method of Ebrahimian et al. and the one‐point method of Shepard et al. The values of S between the two‐point methods are nearly identical in all cases, while the values of the A/Ks ratio range from 0.48 to 0.89 (parameter A is related to Ks). Regarding the one‐point method, the two examined methods yield similar S values as their relationship is given by the equation SShepard = 1.043 Snew (coefficient of determination
), while the values of the parameters A and Ks are linked by the equation
.