The HPx software for multicomponent reactive transport during variably-saturated flow - recent developments and applications

Research output: Contribution to journalArticle

Authors

Institutes & Expert groups

  • University of California Riverside
  • CSIRO - Commonwealth Scientific and Industrial Research Organisation
  • UERJ - Universidade do Estado de Rio de Janeiro

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DOI

Abstract

HPx is a multicomponent reactive transport model which uses HYDRUS as the flow and transport solver and PHREEQC-3 as the biogeochemical solver. Some recent adaptations have significantly increased the flexibility of the software for different environmental and engineering applications. This paper gives an overview of the most significant changes of HPx, such as coupling transport properties to geochemical state variables, gas diffusion, and transport in two and three dimensions. OpenMP allows for parallel computing using shared memory. Enhancements for scripting may eventually simplify input definitions and create possibilities for defining templates for generic (sub)problems. We included a discussion of root solute uptake and colloid-affected solute transport to show that most or all of the comprehensive features of HYDRUS can be extended with geochemical information. Finally, an example is used to demonstrate how HPx, and similar reactive transport models, can be helpful in implementing different factors relevant for soil organic matter dynamics in soils. HPx offers a unique framework to couple spatial-temporal variations in water contents, temperatures, and water fluxes, with dissolved organic matter and CO2 transport, as well as bioturbation processes.

Details

Original languageEnglish
Pages (from-to)221-226
Number of pages16
JournalJournal of Hydrology and Hydromechanics
Volume66
Issue number2
DOIs
Publication statusPublished - 1 Jun 2018

Keywords

  • HYDRUS, HPx, numerical modeling, reactive transport, organic matter, bioturbation

ID: 4382343