Definitions
Wetting is defined as the process leading to increase in water content of an unsaturated soil upon ingress of water.
Drying is defined as the process leading to reduction in water content and degree of saturation of a soil due to evaporation or evapotranspiration.
Introduction
Residual soils often exist where the climate is characterized by alternate wet and dry seasons. During dry period, the soil zone located above the water table and near the ground surface (up to depths of 6 m or more) begins to dry out with concomitant reduction in degree of saturation (S r) in the soil mass. The loss in water by evaporation causes water to flow from the deeper regions of the soil mass toward the surface by capillary action. During drying process, capillary menisci form between adjacent soil particles at the air-water interface, with the pore water pressure (u w) in the convex inner side being lower than the atmospheric pressure (u a) on the concave outer side of the menisci (Yong and...
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Rao, S.M. (2011). Wetting and Drying, Effect on Soil Physical Properties. In: Gliński, J., Horabik, J., Lipiec, J. (eds) Encyclopedia of Agrophysics. Encyclopedia of Earth Sciences Series. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-3585-1_189
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