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A method for estimating unsaturated hydraulic properties of vertically heterogeneous soils from transient capillary pressure profiles


Agricultural & Forest Meteorology 84(1-2): 37-50
A method for estimating unsaturated hydraulic properties of vertically heterogeneous soils from transient capillary pressure profiles
The hydraulic properties of soil are represented by the relationship between the volumetric water content theta and the soil capillary pressure psi and the relationship between the hydraulic conductivity KAPPA and psi. 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 KAPPA(psi) values and Mualem's model to derive the KAPPA-psi relationship from the soil water retention characteristic. With this method, three parameters that are contained both in the theta-psi and KAPPA-psi 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.

Accession: 002738331

DOI: 10.1016/s0168-1923(96)02373-8

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