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 θ 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(θ) to be easily arrived at.
A simplified method to determine the first primary drying and wetting curves of water diffusivity of unsaturated soil / Sommella, Angelo; A., Comegna; Palladino, Mario; A., Coppola. - In: JOURNAL OF AGRICULTURAL ENGINEERING. - ISSN 2239-6268. - 44:s2(2013), pp. 839-843. [10.4081/jae.2013.(s1):e168]
A simplified method to determine the first primary drying and wetting curves of water diffusivity of unsaturated soil
SOMMELLA, ANGELO;PALLADINO, MARIO;
2013
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 θ 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(θ) to be easily arrived at.| File | Dimensione | Formato | |
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