|Van Genuchten, Martinus|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 11/1/2005
Publication Date: 2/28/2006
Citation: Jacques, D., Simunek, J., Mallants, D., Van Genuchten, M.T. 2006. Reactive transport modelling in the vadose zone with coupled PHREEQC-HYDRUS 1d code. Book of Abstracts, SCK-CEN meeting, Belgium Nuclear Research Centre, Mol. Belgium. p. 23.
Technical Abstract: To model multicomponent transport during transient variably-saturated flow in the vadose zone, complex models are needed. Ideally such models should incorporate simultaneous solutions for the water flow equation, solute transport and equilibrium or kinetically homogeneous and heterogeneous geochemical reactions. A new model is presented that couples the HYDRUS-1D model (solving water flow and solute transport for unsaturated transient flow conditions) with the PHREEQC code (calculating speciation, ion exchange, surface complexation, and mineral dissolution/ precipitation). Different examples having several levels of complexity are compared with an independent model (CRUNCH) for steady state flow conditions. We illustrate the possibilities of the new code by simulating heavy metal transport in a podzol and simulating the long term behaviour of these heavy metal under natural (rainfall and evaporation) flow conditions.