Modeling of Border Irrigation in Soils with the Presence of a Shallow Water Table. I: The Advance Phase

The overelevation of the water table in surface irrigation plots is one main factors affecting salinization agricultural soils. Therefore, it necessary to develop simulation models that consider effect a shallow process advance-infiltration an event. This paper, first series three, develops simple mathematical model for advance phase border soils with presence table. In this study, hydrodynamic Barré de Saint-Venant equations used flow, and are solved using Lagrangian finite-differences scheme, while subsurface analytical solution infiltration found bisection method search roots. addition, hydraulic resistance law eliminates numerical instabilities presented by Manning–Strickler law. results difference tests show adjustments R2 > 0.98 cases presented. It also revealed that, when increasing time step, precision maintained, possible reduce computation up 99.45%. Finally, proposed here recommended studying during tables.