2000 Volume 44 Pages 187-192
Micro-meteorological data and data concerning post-irrigation heat and moisture transfer at shallow depths below the surface of a sandy soil were collected in the United Arab Emirates during September 1998. Direct measurement of the evaporation from the soil was carried out using a small removable soil column buried vertically in the ground. From this experiment, the time change of evaporation rate from bare sandy soil after irrigation was obtained. In addition, using the observed evaporation rate, the water vapor transfer coefficient, λ m was evaluated for the α-β bulk equation, and the correction coefficient for liquid-vapor interfacial area, ξ was evaluated from the diffusion equation. It is concluded that the proposed experimental techniques are appropriate for field measurements of post-irrigation drying phenomena in arid regions.
