Abstract

ZAVALA, Manuel; SAUCEDO, Heber  and  FUENTES, Carlos. Simulation model for subsurface agricultural drainage. Tecnol. cienc. agua [online]. 2020, vol.11, n.2, pp.262-290.  Epub May 27, 2020. ISSN 2007-2422.  https://doi.org/10.24850/j-tyca-2020-02-07.

The second version of the computer program DRENAS (subsurface agricultural drainage) is presented, which includes four analytical solutions and a finite element solution Galerkin type of the differential equation of agricultural drainage in its one-dimensional form and can be run under Windows systems of 32-bit or 64-bit. The analytical and numerical models included in version 1.0 of the program were migrated from Visual Basic 2005 to Visual Basic 2017 and modified to expand and improve their calculation, data recording and results visualization capabilities. The numerical model can now solve the non-linear Boussinesq equation with variable coefficients including the vertical recharge term and allows use at the boundary of the drains, Dirichlet condition, linear radiation or fractal radiation. The results provided by the module of the numerical solution of the program were validated using an analytical solution and a drainage test.

Keywords : Boussinesq equation; variable storage coefficient; fractal radiation condition; soil hydraulic properties.