Application and Comparison of Parametric Pedotransfer Functions of van Genuchten Model for Transient Water Flow Simulation in a Cultivated Soil

Document Type : Research Paper

Authors

Abstract

In recent years, using pedotransfer functions (PTFs) has been considerated as a way to estimate
the hydraulic properties of soil from easily to measured parameters. In this research, soil water
retention curve of a clay loam soil was estimated using some of the global and regional PTFs. Soil
water retention curve (SWRC) was constructed using direct measuring methods in laboratory and
the validation of PTFs for estimation of the mentioned curve was evaluated. By entering the
measured and estimated SWRC to Hydrus-1D, soil water flow was simulated and the accuracy of
the PTFs for simulation of water flow was quantitatively compared. The results showed that the
functions of Sepaskhah (Sepas), Yaghubi-1(Y-(1)), Yaghubi-2(Y-(2)) and Ghorbani-2(Gh-(2)) with
normalized root mean square error (NRMSE) values of less than 0.1 could reasonably predict SWRC
of the surface soil. In prediction of SWRC of subsurface soil, the NRMSE values of most global
PTFs were less than 0.3 and for most of the regional PTFs were less than 0.2. NRMSE values in
simulation of water content of surface and subsurface soils using Hydrus by applying different
PTFs were between 0.07 to 0.84, respectively. It can be concluded that in running validating phase
one should consider the objective for which the PTFs may be applied.

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Main Subjects


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