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| Titel |
Desiccation-crack-induced salinization in deep clay sediment |
| VerfasserIn |
S. Baram, Z. Ronen, D. Kurtzman, C. Külls, O. Dahan |
| 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 ; 17, no. 4 ; Nr. 17, no. 4 (2013-04-22), S.1533-1545 |
| Datensatznummer |
250018855
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| Publikation (Nr.) |
 copernicus.org/hess-17-1533-2013.pdf |
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| Zusammenfassung |
| A study on water infiltration and solute transport in a clayey vadose zone
underlying a dairy farm waste source was conducted to assess the impact of
desiccation cracks on subsurface evaporation and salinization. The study is
based on five years of continuous measurements of the temporal variation in
the vadose zone water content and on the chemical and isotopic composition
of the sediment and pore water in it. The isotopic composition of water
stable isotopes (δ18O and δ2H) in water and
sediment samples, from the area where desiccation crack networks prevail,
indicated subsurface evaporation down to ~ 3.5 m below land
surface, and vertical and lateral preferential transport of water, following
erratic preferential infiltration events. Chloride (Cl−) concentrations
in the vadose zone pore water substantially increased with depth, evidence
of deep subsurface evaporation and down flushing of concentrated solutions
from the evaporation zones during preferential infiltration events. These
observations led to development of a desiccation-crack-induced salinization
(DCIS) conceptual model. DCIS suggests that thermally driven convective air
flow in the desiccation cracks induces evaporation and salinization in
relatively deep sections of the subsurface. This conceptual model supports
previous conceptual models on vadose zone and groundwater salinization in
fractured rock in arid environments and extends its validity to clayey soils
in semi-arid environments. |
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