Water Science and Engineering 2017, 10(3) 184-196 DOI:   https://doi.org/10.1016/j.wse.2017.09.001  ISSN: 1674-2370 CN: 32-1785/TV

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Keywords
Solute transport
Layered soil
Consolidation
Unsaturated soil
Deformable media
Authors
PubMed

Numerical modeling of solute transport in deformable unsaturated layered soil

Sheng Wu, Dong-sheng Jeng *

Cities Research Institute, Griffith School of Engineering, Griffith University, Southport 4222, Australia

Abstract

The effect of soil stratification was studied through numerical investigation based on the coupled model of solute transport in deformable unsaturated soil. The theoretical model implied two-way coupled excess pore pressure and soil deformation based on Biot’s consolidation theory as well as a one-way coupled volatile pollutant concentration field developed from the advection-diffusion theory. Embedded in the model, the degree of saturation, fluid compressibility, self-weight of the soil matrix, porosity variance, longitudinal dispersion, and linear sorption were computed. Based on simulation results of a proposed three-layer landfill model using the finite element method, the multi-layer effects are discussed with regard to the hydraulic conductivity, shear modulus, degree of saturation, molecular diffusion coefficient, and thickness of each layer. Generally speaking, contaminants spread faster in a stratified field with a soft and highly permeable top layer; soil parameters of the top layer are more critical than the lower layers but controlling soil thicknesses will alter the results. This numerical investigation showed noticeable impacts of stratified soil properties on solute migration results, demonstrating the importance of correctly modeling layered soil instead of simply assuming the averaged properties across the soil profile.

Keywords Solute transport   Layered soil   Consolidation   Unsaturated soil   Deformable media  
Received 2017-02-03 Revised 2017-06-30 Online: 2017-07-30 
DOI: https://doi.org/10.1016/j.wse.2017.09.001
Fund:
Corresponding Authors: d.jeng@griffith.edu.au (Dong-sheng Jeng).
Email: d.jeng@griffith.edu.au
About author:

References:

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