Publication: Relaciones agua-suelo-vegetación.-Hysteretic behaviour of thermal properties on porous media
Authors
Rubio, C.M. ; Josa, R. ; Campbell, C. ; Ferrer, F.
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Universidad de Murcia
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DOI
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info:eu-repo/semantics/other
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Abstract
ABSTRACT
In order to partly fill the thermal soil properties studies, we focused this work in the relation
between thermal and hydrodynamic soil properties for several soil textural classes. This
study was divided in two different objectives; (i) to determine and to analyze soil thermal and
hydrodynamic properties, and (ii) to explore the impacts of hysteresis on soil thermal
properties under experimental controlled conditions. Samples were obtained from Llobregat
delta plain (Spain). To measure soil thermal properties, simple needle sensors were used.
The samples were repacked in a soil column device. Volumetric water content and thermal
conductivity were monitored continuously. The results allowed a rather complete
understanding of the relation between thermal and hydrodynamic properties at laboratory
scale for silt loam soils. Differences in thermal properties at a given water content were
interpreted as a results of different hysteretic paths observed, arising in turn from different
wetting and drying processes. Reasonably, we support that, in observed water contents, a
change has taken place in the internal structure of the soil water, and how the water was
adsorbed. This fact produced differences in the thin water films around the particles, and
affected heat transport. This topic needs further theoretical and experimental investigation,
and moreover to establish comparison with other variables that could cause effect on the
thermal properties.
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