The HPx reactive transport models: Summary of recent developments and applications

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The HPx reactive transport codes are developed to couple flow and transport processes in variable-saturated porous media with a variety of low-temperature geochemical processes. It consists of the HYDRUS models for flow and transport models (HYDRUS-1D 4.16 and HYDRUS2/3 2.02) with the generic thermodynamic and kinetic model PHREEQC-2.17. As such, HPx, no available for one (HP1) and two dimensional flow and transport problems, expands significantly the capabilities of the individual codes. Recent developments and applications are: Gas diffusion. One important application of this is to simulate CO2 sequestration in soil. HPx gives a large flexibility in defining different kinetic networks with rate coefficients depending on temperature, water content or any other variable. Extension to two-dimensional flow problems Inverse optimization of geochemical parameters. An example is given in which exchange parameters are fitted on data from a water adsorption experiment Feedback between change in geochemical variables and transport properties. As an example, leaching of material and the progression of pH and porosity fronts are discussed. Benchmarking of several of these new developments with other reactive transport codes.


Original languageEnglish
Title of host publicationProceedings of the 4 International Conference HYDRUS Software Applications to Subsurface Flow and Contaminant Transport Problems
Place of PublicationPrague, Czech Republic
Publication statusPublished - Mar 2013
EventHydrus Software Applications to Subsurface Flow and Contaminant Transport Problems - Czech University of Life Sciences, Faculty of Agrobiology, Food and Natural Resources, and PC Progress, Ltd, Prague, Czech Republic
Duration: 18 Mar 201322 Mar 2013


ConferenceHydrus Software Applications to Subsurface Flow and Contaminant Transport Problems
Country/TerritoryCzech Republic


  • HPx, reactive transport model, variably-saturated soil

ID: 214276