TY - JOUR
T1 - Numerical investigation on three-phase flow in unsaturated soil considering porosity effects on soil hydraulic properties
AU - Yu, Jiaren
AU - Zhou, Chao
N1 - Funding Information:
This work is supported by the Research Grants Council (RGC) of the HKSAR through the research grants 16204817 and 15205721.
Publisher Copyright:
© The Authors, published by EDP Sciences, 2023.
PY - 2023/4/24
Y1 - 2023/4/24
N2 - Ground contamination by mineral oil and hydrocarbons is a serious problem worldwide. These non-aqueous phase liquid (NAPL) represents long-term contamination sources to the soil, groundwater, and ecological environment. In the existing numerical simulation models utilized in most simulation programs, the relation between porosity and the hydraulic properties of unsaturated soils is highly simplified as nonlinear. However, the nonlinear porosity effect on soil permeability and the capillary pressures cannot be well considered in this way. In this study, a new mathematical model has been developed to incorporate porosity effects into the hydraulic properties of soils, including the retention behaviour and permeability function of NAPL and water. This model has been implemented in MATLAB using the finite difference method and verified by a centrifuge test about NAPL infiltration. Then, a series of parametric studies will be carried out to investigate the multi-phase flow under a continuously leaking NAPL source. The influence of porosity magnitude and distribution will be investigated. Special attention will be paid to the influence of porosity distribution by soil consolidation on NAPL flow, which is often ignored by the existing simulations using constant porosity values.
AB - Ground contamination by mineral oil and hydrocarbons is a serious problem worldwide. These non-aqueous phase liquid (NAPL) represents long-term contamination sources to the soil, groundwater, and ecological environment. In the existing numerical simulation models utilized in most simulation programs, the relation between porosity and the hydraulic properties of unsaturated soils is highly simplified as nonlinear. However, the nonlinear porosity effect on soil permeability and the capillary pressures cannot be well considered in this way. In this study, a new mathematical model has been developed to incorporate porosity effects into the hydraulic properties of soils, including the retention behaviour and permeability function of NAPL and water. This model has been implemented in MATLAB using the finite difference method and verified by a centrifuge test about NAPL infiltration. Then, a series of parametric studies will be carried out to investigate the multi-phase flow under a continuously leaking NAPL source. The influence of porosity magnitude and distribution will be investigated. Special attention will be paid to the influence of porosity distribution by soil consolidation on NAPL flow, which is often ignored by the existing simulations using constant porosity values.
UR - http://www.scopus.com/inward/record.url?scp=85159258858&partnerID=8YFLogxK
U2 - 10.1051/e3sconf/202338220006
DO - 10.1051/e3sconf/202338220006
M3 - Conference article
AN - SCOPUS:85159258858
SN - 2555-0403
VL - 382
JO - E3S Web of Conferences
JF - E3S Web of Conferences
M1 - 20006
T2 - 8th International Conference on Unsaturated Soils, UNSAT 2023
Y2 - 2 May 2023 through 5 May 2023
ER -