Modeling of the Moisture Transfer in Soils with Regard for Thermal and Chemical Factors

Abstract

We propose a procedure for the construction of an equation of moisture transfer in soils with regard for the action of thermal and chemical factors. This procedure is based on the formulation of the equation of continuity containing the time derivative of a composite function for the liquid phase of a porous medium. As a result, the coefficients in the equation of moisture transfer depend on the variations of temperature, the concentrations of chemical substances in liquid and solid phases, and porosity as functions of time and contain the derivatives of density of the pore liquid and porosity as functions of temperature and the concentrations of chemical substances. The dependences of the parameters of the soil phase (density, coefficients of moisture transfer, diffusion coefficient of soil moisture, porosity, etc.) on the indicated factors are analyzed.