Abstract
A mathematical model was developed in order to analyze heat, liquid water and water vapor movement in a soil column associated with evaporation from soil pores at the interface between the dry and capillary layers. In the proposed model, the evaporation is taken as the vapor pressure difference between the soil pore space and that at the surface of the water films surrounding to soil particles. As a consequence, the energy equation and mass balance equations for liquid and for water vapor can be solved simultaneously. The proposed model was able to reproduce well diurnally varying temperature, volumetric water content and vapor pressure profile, obtained in a laboratory.
