No Cover Image

Journal article 267 views

Reactive transport of chemicals in unsaturated soils: numerical model development and verification

Majid Sedighi, Hywel Thomas Orcid Logo, Philip J. Vardon

Canadian Geotechnical Journal, Volume: 53, Issue: 1, Pages: 162 - 172

Swansea University Author: Hywel Thomas Orcid Logo

Full text not available from this repository: check for access using links below.

Check full text

DOI (Published version): 10.1139/cgj-2014-0436

Abstract

This paper presents the development of a numerical model for reactive transport of multicomponent chemicals in unsaturated soils. The model has been developed based on a coupled thermal, hydraulic, chemical, and mechanical (THCM) formulation, and extended by the inclusion of geochemical processes un...

Full description

Published in: Canadian Geotechnical Journal
ISSN: 0008-3674 1208-6010
Published: Canadian Science Publishing 2016
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa52878
Tags: Add Tag
No Tags, Be the first to tag this record!
Abstract: This paper presents the development of a numerical model for reactive transport of multicomponent chemicals in unsaturated soils. The model has been developed based on a coupled thermal, hydraulic, chemical, and mechanical (THCM) formulation, and extended by the inclusion of geochemical processes under mixed equilibrium and kinetically controlled reactions in–between the solid, aqueous, and gas phases in soil. This has been achieved by coupling the transport model, COMPASS, with the geochemical model, PHREEQC. Key coupling between the geochemical modelling and the flow of chemicals has been established via the inclusion of porosity modification from mineral precipitation–dissolution reactions and the consequential effects on flow processes. Verification of the developed model is addressed via a series of benchmark simulations with a focus on testing the coupling between the transport model and geochemical model. Good results have been achieved for the verification of the theoretical and numerical implementation of the new developments in the model. A simulation is presented to demonstrate the effects of mineral reactions on porosity evolution and chemical diffusion in a low porosity soil. The model developed is an advanced tool for studying the hydrogeochemical processes in unsaturated soils under variable THCM conditions. © 2015, National Research Council of Canada. All rights reserved.
Issue: 1
Start Page: 162
End Page: 172