Simulation Infiltration Rate of Water on Sand Media by Finite Difference Method

Masitah Osman(1*), Nasrul Ihsan(2), Muhammad Arsyad(3),

(*) Corresponding Author


Simulation Infiltration Rate of water on two dimension of thin plate soil by using finite difference method. The water flow in unsaturated zone explained by Nonlinear Richard equation mathematically. Richard equation is a partial differential equation, parabolic type. The finite difference approximate that recommended to solve this equation is ADI (Alternating Direction Implicit) method. The distribution of water content from finite difference method calculation is compared to the distribution of water content from analytic calculation. The error percentage of model is depending on size of mesh grid, they are 4.0 cm, 2.0 cm and 1.0 cm and the errors in a row are 0.31%, 0.43% and 0.52%. The type of soil are interpreted in this simulation is sand. The simulation show that the longer time duration the smaller infiltration rate on the sand field.

Keywords:  Infiltration Rate, ADI Method, Campbell Relationship

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