Effective hydraulic parameters for steady state vertical flow in heterogeneous soils

摘要: [1] In hydroclimate and land-atmospheric interaction models, effective hydraulic properties are needed at large grid scales. In this study, the soil parameters of areally heterogeneous formation derived by conceptualizing as an equivalent homogeneous medium assuming that will approximately discharge same total amount flux produce average pressure head profile in formation. As compared to previous property studies, a specific feature study is mean-gradient-dependent (i.e., vary across depth). Although areal heterogeneity was formulated parallel stream tubes our results appear be consistent with findings mean-gradient unsaturated conductivity [Yeh et al., 1985a, 1985b]. Three widely used models were employed i.e., Gardner model, Brooks Corey van Genuchten model. We examined impact parameter correlation, boundary condition (surface head), elevation above water table on saturated shape parameter. The correlation between Ks α increases conductivity, while it does not affect α. usually smaller than mean value α, can or larger depending no full fields, respectively. An important observation functions resulted parameters, whereas difficult define for model since uses piecewise-continuous conductivity.