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Modeling of contaminant transport in soils considering the effects of micro- and macro-heterogeneity

Nezhad, M. M. and Javadi, A. A. and Rezania, M. (2011) Modeling of contaminant transport in soils considering the effects of micro- and macro-heterogeneity. Journal of Hydrology, 404 (3-4). pp. 332-338. ISSN 0022-1694

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This paper presents development and application of a numerical model for simulation of contaminant transport considering macro- and micro-heterogeneity in soil. Stochastic finite element approach is used to incorporate the effects of the spatial variability of soil hydraulic properties on contaminant fate. The soil micro-heterogeneity effects are modeled with a dual domain concept in which a first order kinetic expression is used to describe the transfer of the solute between the two domains. The model is used to simulate transport of non-reactive solute in a lysimeter under steady-state water flux. Numerical simulation of the problem is carried out for four different scenarios assumed for structure and formation of the soil: a single domain having uniform hydraulic properties (SDU), a dual-domain system with uniform hydraulic properties (DDU), a single domain with spatially variable hydraulic properties (SDV) and a dual-domain system with spatially variable hydraulic properties (DDV). The numerical results are compared with experimental data. The results obtained based on SDU are not in agreement with the measured data. Assuming a dual domain system (DDU) yields satisfactory results but higher accuracy is achieved using DDV scenario. The results show that the combination of the dual domain approach with the stochastic approach improves the numerical predictions. Also, using stochastic finite element approach makes it possible to evaluate variance of concentration as an index of reliability of the result.

Item type: Article
ID code: 40779
Keywords: dual-domain, solute transport, fractured porous-media, breakthrough, dual-porosity model, macroporous soil, lysim, stochastic finite element method, unsaturated flow, water-flow, contaminant transport, soil heterogeneity, infiltration, stochastic-analysis, micro-heterogeneity, macro-heterogeneity, lysimeter, Engineering (General). Civil engineering (General), Water Science and Technology
Subjects: Technology > Engineering (General). Civil engineering (General)
Department: Faculty of Engineering > Civil and Environmental Engineering
Depositing user: Pure Administrator
Date Deposited: 08 Aug 2012 12:48
Last modified: 05 Jan 2016 13:11
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