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| Titel |
Solid phase evolution in the Biosphere 2 hillslope experiment as predicted by modeling of hydrologic and geochemical fluxes |
| VerfasserIn |
K. Dontsova, C. I. Steefel, S. Desilets, A. Thompson, J. Chorover |
| 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 ; 13, no. 12 ; Nr. 13, no. 12 (2009-12-01), S.2273-2286 |
| Datensatznummer |
250012064
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| Publikation (Nr.) |
 copernicus.org/hess-13-2273-2009.pdf |
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| Zusammenfassung |
| A reactive transport geochemical modeling study was conducted to help
predict the mineral transformations occurring over a ten year time-scale
that are expected to impact soil hydraulic properties in the Biosphere 2
(B2) synthetic hillslope experiment. The modeling sought to predict the rate
and extent of weathering of a granular basalt (selected for hillslope
construction) as a function of climatic drivers, and to assess the feedback
effects of such weathering processes on the hydraulic properties of the
hillslope. Flow vectors were imported from HYDRUS into a reactive transport
code, CrunchFlow2007, which was then used to model mineral weathering
coupled to reactive solute transport. Associated particle size evolution was
translated into changes in saturated hydraulic conductivity using Rosetta
software. We found that flow characteristics, including velocity and
saturation, strongly influenced the predicted extent of incongruent mineral
weathering and neo-phase precipitation on the hillslope. Results were also
highly sensitive to specific surface areas of the soil media, consistent
with surface reaction controls on dissolution. Effects of fluid flow on
weathering resulted in significant differences in the prediction of soil
particle size distributions, which should feedback to alter hillslope
hydraulic conductivities. |
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