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| Titel |
Capillary rise quantifications based on in-situ artificial deuterium peak displacement and laboratory soil characterization |
| VerfasserIn |
O. Grünberger, J. L. Michelot, L. Bouchaou, P. Macaigne, Y. Hsissou, C. Hammecker |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 15, no. 5 ; Nr. 15, no. 5 (2011-05-27), S.1629-1639 |
| Datensatznummer |
250012793
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| Publikation (Nr.) |
 copernicus.org/hess-15-1629-2011.pdf |
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| Zusammenfassung |
| In arid environments, water rises from the saturated level of a shallow
aquifer to the drying soil surface where evaporation occurs. This process
plays important roles in terms of plant survival, salt balance and aquifer
budget. A new field quantification method of this capillary rise flow is
proposed using micro-injections (6 μL) of a deuterium-enriched
solution (δ value of 63 000‰ vs. V-SMOW) into unsaturated soil
at a 1 m depth. Evaluation of peak displacement from profile sampling 35
days later delivered an estimate that was compared with outputs of numerical
simulation based on laboratory hydrodynamic measurements assuming a steady
state regime. A rate of 3.7 cm y−1 was estimated at a Moroccan site,
where the aquifer water depth was 2.44 m. This value was higher than that
computed from the relationship between evaporation rates and water level
depth based on natural isotopic profile estimates, but it was lower than
every estimate established using integration of the van Genuchten closed-form
functions for soil hydraulic conductivity and retention curve. |
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