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Numerical modeling of contaminant transport through soils / A. A. Javadi in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N°2 (Fevrier 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°2 (Fevrier 2008) . - pp. 214–230 Titre : Numerical modeling of contaminant transport through soils : case study Type de document : texte imprimé Auteurs : A. A. Javadi, Auteur ; M. M. Al-Najjar, Auteur ; B. Evans, Auteur Année de publication : 2008 Article en page(s) : pp. 214–230 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Pollutants  Unsaturated  soils  Finite  element  method  Case  reports  Finite  element  method  Advection  Dispersion  Diffusion  Adsorption Résumé : This paper presents the development and validation of a numerical model for simulation of the flow of water and air and contaminant transport through unsaturated soils. The governing differential equations include two mass balance equations for the water phase and air phase together with a balance equation for contaminant transport through the two phases. In the model the nonlinear system of the governing differential equations was solved using a finite-element method in the space domain and a finite difference scheme in the time domain. The governing equation of the miscible contaminant transport including advection, dispersion-diffusion and adsorption effects are presented. The mathematical framework and the numerical implementation of the model are described in detail. The model is validated by application to standard experiments on contaminant transport in unsaturated soils. The application of the model to a case study is then presented and discussed. Finally, the merits and limitations of the model are highlighted. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A2%2821 [...] [article] Numerical modeling of contaminant transport through soils : case study [texte imprimé] / A. A. Javadi, Auteur ; M. M. Al-Najjar, Auteur ; B. Evans, Auteur . - 2008 . - pp. 214–230. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°2 (Fevrier 2008) . - pp. 214–230 Mots-clés : Pollutants  Unsaturated  soils  Finite  element  method  Case  reports  Finite  element  method  Advection  Dispersion  Diffusion  Adsorption Résumé : This paper presents the development and validation of a numerical model for simulation of the flow of water and air and contaminant transport through unsaturated soils. The governing differential equations include two mass balance equations for the water phase and air phase together with a balance equation for contaminant transport through the two phases. In the model the nonlinear system of the governing differential equations was solved using a finite-element method in the space domain and a finite difference scheme in the time domain. The governing equation of the miscible contaminant transport including advection, dispersion-diffusion and adsorption effects are presented. The mathematical framework and the numerical implementation of the model are described in detail. The model is validated by application to standard experiments on contaminant transport in unsaturated soils. The application of the model to a case study is then presented and discussed. Finally, the merits and limitations of the model are highlighted. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A2%2821 [...]