An estimate of energy dissipation due to soil-moisture hysteresis
KAUST Grant NumberKUK-C1–013-04
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AbstractProcesses of infiltration, transport, and outflow in unsaturated soil necessarily involve the dissipation of energy through various processes. Accounting for these energetic processes can contribute to modeling hydrological and ecological systems. The well-documented hysteretic relationship between matric potential and moisture content in soil suggests that one such mechanism of energy dissipation is associated with the cycling between wetting and drying processes, but it is challenging to estimate the magnitude of the effect in situ. The Preisach model, a generalization of the Independent Domain model, allows hysteresis effects to be incorporated into dynamical systems of differential equations. Building on earlier work using such systems with field data from the south-west of Ireland, this work estimates the average rate of hysteretic energy dissipation. Through some straightforward assumptions, the magnitude of this rate is found to be of O(10-5) W m-3. Key Points Hysteresis in soil-water dissipates energy The rate of dissipation can be estimated directly from saturation data The rate of heating caused is significant ©2013. American Geophysical Union. All Rights Reserved.
CitationMcNamara H (2014) An estimate of energy dissipation due to soil-moisture hysteresis. Water Resour Res 50: 725–735. Available: http://dx.doi.org/10.1002/2012WR012634.
SponsorsPart of this work was carried out while the author was supported by the Oxford Martin School. The author also benefited from the hospitality of the Aspen Center for Physics, courtesy of the National Science Foundation grant 1066393, and from award KUK-C1–013-04, made by King Abdullah University of Science and Technology (KAUST). A special acknowledgement must go to the late Alexei Pokrovskii, one of the originators of the mathematical theory of hysteresis, who suggested this investigation but unfortunately did not see its completion. A final acknowledgement is due to the reviewers of this manuscript who made important suggestions to make it clearer and more accessible.
JournalWater Resources Research