Abstract
The hydraulic properties of soil are represented by the relationship between the volumetric water content θ and the soil capillary pressure ψ and the relationship between the hydraulic conductivity K and ψ. A method to estimate the hydraulic properties for each horizontal layer of a soil profile was developed by combining the instantaneous profile method to compute K( ψ) values and Mualem's model to derive the K- ψ relationship from the soil water retention characteristic. With this method, three parameters that are contained both in the θ-ψ and K- ψ models are optimized by an iterative procedure using transient capillary pressure profiles during water redistribution. Two hypothetical soil columns were used to test the parameter estimation procedure, and it was shown that the proposed method can be applied to soil profiles which have homogeneous or heterogeneous hydraulic properties with depth.
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