Simulation of the effect of time-variable water flow on the speciation and mobility of reactive elements in the soil

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Abstract

The speciation and mobility of elements in the soil are the result of an interplay between physical, chemical and biological processes in the soil. Transient flow conditions influence the geochemical conditions due to changing water and solute fluxes and water contents. A reactive coupled simulator is needed to explore coupled effects. HP1 is a generic coupled code based on HYDRUS-1D and PHREEQC-2. The code is used to illustrate the effect of transient flow conditions on speciation and mobility of elements in the soil at a seasonal and long-term time scale. Two examples ((1) Heavy metal migration in a podzol soil and (2) P and U migration in a soil profile from inorganic P-fertilizers) illustrated the effects of water flow processes on speciation and mobility. Transient flow conditions (fluxes and water content) influence geochemical conditions (pH) and speciation by concentration changes resulting in changes in adsorption potential and aqueous complexation.

Details

Original languageEnglish
Title of host publicationThe Second HYDRUS Workshop
Place of PublicationPrague, Czech Republic
Pages85-92
Publication statusPublished - 28 Mar 2008
EventHYDRUS workshop - Prague, Czech Republic
Duration: 28 Mar 200828 Mar 2008

Conference

ConferenceHYDRUS workshop
CountryCzech Republic
CityPrague
Period2008-03-282008-03-28

Keywords

  • reactive transport modelling, vadose zone, HP1

ID: 87706