Modeling of Hydrophysical Properties of the Soil as Capillary-Porous Media and Improvement of Mualem-Van Genuchten Method as a Part of Foundation Arrangement Research

Table 1

Two systems of soil hydrophysical functions.

Mualem-Van Genuchten system	System proposed in this paper
⁢Water-retention capacity
Approximation to WRC function that interpolates the experimental data	The antiderivative of theoretically justified function of differential moisture capacity and approximation to this antiderivative
⁢Differential water capacity
The derivative of the approximation to WRC function	The function, which is reasonable in terms of the concept of capillarity and lognormal distribution of effective pore radii
⁢The ratio of hydraulic conductivity of soil to the filter coefficients of moisture
WRC approximation is used with a ratio	Theoretically justified function of differential water capacity is used
⁢The parameters of soil hydrophysical functions
Empirical parameters α and n are estimated by interpolation of WRC data or using some pedotransfer functions	Physical and statistical interpreted parametersα and n are theoretically justified. Estimation the parameters can be made using the indicators of soil: ;