Solid phase evolution in the Biosphere 2 hillslope experiment as predicted by modeling of hydrologic and geochemical fluxes

Katerina M Dontsova, C. I. Steefel, S. Desilets, A. Thompson, Jon Chorover

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)2273-2286
Number of pages14
JournalHydrology and Earth System Sciences
Volume13
Issue number12
StatePublished - 2009

Fingerprint

Biosphere 2
hillslope
weathering
reactive transport
modeling
hydraulic property
experiment
hydraulic conductivity
mineral
particle size
soil
solute transport
fluid flow
surface area
basalt
dissolution
saturation
timescale
software
prediction

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Water Science and Technology

Cite this

Solid phase evolution in the Biosphere 2 hillslope experiment as predicted by modeling of hydrologic and geochemical fluxes. / Dontsova, Katerina M; Steefel, C. I.; Desilets, S.; Thompson, A.; Chorover, Jon.

In: Hydrology and Earth System Sciences, Vol. 13, No. 12, 2009, p. 2273-2286.

Research output: Contribution to journalArticle

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