بررسي و مقايسه 5 روش مختلف تعيين پارامترهاي معادله انتقال املاح در خاك

Evaluation of 5 Mathematical Methods in Determination of Solute Transport Equations Parameters

One of the most important processes in environmental and hydrological problems and soil science, solute transport is simulated by different mathematical equations .Correct understanding of soil hydro-dynamical behavior in solute transport depends on exact parameter estimation of these equations .Different methods exist for estimation or determination of these parameters. In this study, 5 methods; Rifai et al (1956),Gupta and Greenkorn (1974),Elprince and Day (1997), Yamagushi et al (1989) and Hydrus-ID software (Simunek et al 2005) were evaluated to study of chloride transport in 20 topsoil samples obtained from different region of Iran. Solute transport experiments were done in steady state saturated conditions with Heaviside type top boundary condition at small columns of disturbed soil. Five different methods were applied to estimate the soil hydrodynamic parameters. The average soil water velocity and hydrodynamic dispersion coefficients were determined and compared. Results showed that the Elprince and Day method is the best parameter estimation method in according to proper estimations and fitness power.