A simplified method to determine the first primary drying and wetting curves of water diffusivity of unsaturated soil

Abstract

Within the framework of a research project examining the spatial variability of hydraulic characteristics of soil intended for irrigation, some of the more frequently used analytical expressions describing the laws linking diffusivity D to the water content of the soil 􀀅 were verified. By studying the flow field of soil samples tested in the laboratory, under one-dimensional wetting and drying cycles, it has been found that the laws of hydraulic diffusivity of the exponential types can be ascribed to them. Finally, a simplified laboratory method was proposed which, with the aid of nomographs, allows the definition of the law D(􀀅) to be easily arrived at.

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Published
2013-09-08
Keywords:
soil hydraulic characterization, soil water diffusivity, laboratory method.
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How to Cite
Sommella, A., Comegna, A., Palladino, M., & Coppola, A. (2013). A simplified method to determine the first primary drying and wetting curves of water diffusivity of unsaturated soil. Journal of Agricultural Engineering, 44(2s). https://doi.org/10.4081/jae.2013.410