Hydrology and Earth System Sciences www.hydrol-earth-syst-sci.net 1027-5606 1607-7938 13 12 2009 10.5194/hess-13-2273-2009 http://www.hydrol-earth-syst-sci.net/13/2273/2009/ http://www.hydrol-earth-syst-sci.net/13/2273/2009/hess-13-2273-2009.html http://www.hydrol-earth-syst-sci.net/13/2273/2009/hess-13-2273-2009.pdf 2273 2286 2009-12-01 Solid phase evolution in the Biosphere 2 hillslope experiment as predicted by modeling of hydrologic and geochemical fluxes K. Dontsova dontsova@email.arizona.edu C. I. Steefel S. Desilets A. Thompson J. Chorover B2 Earthscience, The University of Arizona, Tucson, AZ, USA Department of Soil, Water & Environmental Science, The University of Arizona, Tucson, USA Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA Department of Hydrology and Water Resources, The University of Arizona, Tucson, AZ, USA Department of Crop and Soil Sciences, University of Georgia, Athens, GA, USA 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. % vor jede Referenz Berner, E. K., Berner, R. A., Moulton, K. L., Heinrich, D. H., and Karl, K. 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