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Chapitre 6. Impact of Heterogeneity on Evaporation from Bare Soils

Assouline, Shmuel and Narkis, Kfir and Veran-Tissoires, Stéphanie and Marcoux, Manuel and Prat, Marc Chapitre 6. Impact of Heterogeneity on Evaporation from Bare Soils. (2014) In: Transport and Reactivity of Solutions in Confined Hydrosystems. Springer Netherlands, 67-76. ISBN 978-94-007-7533-6

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Heterogeneity in soil hydraulic properties has a significant impact on evaporation, and could be harnessed to reduce water losses and improve soil water conservation. This is illustrated through the consideration of the effect of Darcy scale heterogeneities resulting from horizontal layering. The impact of permeability gradient and thickness of layers has been investigated from evaporation experiments performed from homogeneous as well as horizontally multi-layered soil columns. Two main cases are distinguished depending on the sign of the permeability gradient, the unstable case when the permeability increases with depth and the stable case when, on the contrary, the permeability decreases with depth. The results indicate an interesting competition between stabilizing gravity effects and destabilizing or stabilizing permeability gradient effects and lead to the emergence of the concept of two-scale evaporation process.

Item Type:Book Section
Uncontrolled Keywords:
Institution:Other partners > Agricultural Research Organization - ARO (ISRAEL)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
Deposited On:28 Mar 2014 13:41

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