MULTICOMPONENT GEOCHEMICAL TRANSPORT MODELING USING HYDRUS-1D AND HP11

Authors

  • Jirka Š;imůnek,

    1. Respectively, Professor and Hydrologist, Department of Environmental Sciences, University of California, Riverside, California 92521; Research Scientist, Waste and Disposal Department, SCK*CEN, Boeretang 200, B-2400 Mol, Belgium; Senior Research Scientist, George E. Brown, Jr., Salinity Laboratory, 450 West Big Spring Road, Riverside, California 92507; and Research Scientist, Waste and Disposal Department, SCK*CEN, Boeretang 200, B-2400 Mol, Belgium (E-Mail/Simunek: Jiri.Simunek@ucr.edu).
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  • Diederik Jacques,

    1. Respectively, Professor and Hydrologist, Department of Environmental Sciences, University of California, Riverside, California 92521; Research Scientist, Waste and Disposal Department, SCK*CEN, Boeretang 200, B-2400 Mol, Belgium; Senior Research Scientist, George E. Brown, Jr., Salinity Laboratory, 450 West Big Spring Road, Riverside, California 92507; and Research Scientist, Waste and Disposal Department, SCK*CEN, Boeretang 200, B-2400 Mol, Belgium (E-Mail/Simunek: Jiri.Simunek@ucr.edu).
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  • Martinus Th. Van Genuchten,

    1. Respectively, Professor and Hydrologist, Department of Environmental Sciences, University of California, Riverside, California 92521; Research Scientist, Waste and Disposal Department, SCK*CEN, Boeretang 200, B-2400 Mol, Belgium; Senior Research Scientist, George E. Brown, Jr., Salinity Laboratory, 450 West Big Spring Road, Riverside, California 92507; and Research Scientist, Waste and Disposal Department, SCK*CEN, Boeretang 200, B-2400 Mol, Belgium (E-Mail/Simunek: Jiri.Simunek@ucr.edu).
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  • Dirk Mallants

    1. Respectively, Professor and Hydrologist, Department of Environmental Sciences, University of California, Riverside, California 92521; Research Scientist, Waste and Disposal Department, SCK*CEN, Boeretang 200, B-2400 Mol, Belgium; Senior Research Scientist, George E. Brown, Jr., Salinity Laboratory, 450 West Big Spring Road, Riverside, California 92507; and Research Scientist, Waste and Disposal Department, SCK*CEN, Boeretang 200, B-2400 Mol, Belgium (E-Mail/Simunek: Jiri.Simunek@ucr.edu).
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  • 1

    Paper No. 05144 of the Journal of the American Water Resources Association (JAWRA) (Copyright © 2006). Discussions are open until June 1, 2007.

Abstract

Abstract: The transport of reactive contaminants in the subsurface is generally affected by a large number of nonlinear and often interactive physical, chemical, and biological processes. Simulating these processes requires a comprehensive reactive transport code that couples the physical processes of water flow and advective-dispersive transport with a range of biogeochemical processes. Two recently developed coupled geochemical models that are both based on the HYDRUS-1D software package for variably saturated flow and transport are summarized in this paper. One model resulted from coupling HYDRUS-1D with the UNSATCHEM module. While restricted to major ion chemistry, this program enables quantitative predictions of such problems as analyzing the effects of salinity on plant growth and the amount of water and amendments required to reclaim salt-affected soil profiles. The second model, HPI, resulted from coupling HYDRUS-1D with the PHREEQC biogeochemical code. The latter program accounts for a wide range of instantaneous or kinetic chemical and biological reactions, including complexation, cation exchange, surface complexation, precipitation dissolution and/or redox reactions. The versatility of HP1 is illustrated in this paper by means of two examples: the leaching of toxic trace elements and the transport of the explosive TNT and its degradation products.

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