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| Titel |
Experimental Investigation of 2D thermal signature and 3D X-Ray Computed Tomography in contrasting Wettable and Water-Repellent Beads |
| VerfasserIn |
Abdulkareem Alsih, Richard Flavel, Gavan McGrath |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250140611
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| Publikation (Nr.) |
 EGU/EGU2017-4024.pdf |
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| Zusammenfassung |
| Abstract: This study presents experimental results investigating spatial patterns of infiltration
and evaporation in heterogeneous water repellent media. Infrared camera measurements and
3D X-ray computed tomography imaging was performed across wet-dry cycles on glass
beads with engineered patches of water repellence. The imaging revealed spatial variability in
infiltration and the redistribution of water in the media resulting in differences in relative
evaporation rates during drying. It appears that the spatial organization of the heterogeneity
play a role in the breakdown of water repellence at the interface of the two media. This
suggests a potential mechanism for self-organization of repellency spatial patterns in field
soils. At the interface between wettable and water repellent beads a lateral drying
front propagates towards the wettable beads from the repellent beads. During this
drying the relative surface temperatures change from a relatively cooler repellent
media surface to a relatively cooler wettable media surface indicating the changes in
evaporative water loss between the beads of varying water repellence. The lateral
drying front was confirmed using thermography in a small-scale model of glass
beads with chemically induced repellence and then subjected to 3D X-ray imaging.
Pore-scale imaging identified the hydrology at the interface of the two media and at the
drying front giving insights into the physics of water flow in water repellent soil. |
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