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Etude des transferts sol/nappe/atmosphère/bâtiments ; Application aux sols pollués par des Composés Organiques Volatils

Abstract : A bibliography review led to detail the mechanisms of exchange between phases and transport of volatile organic compounds in the vadose zone, to put in equations their transfer, to set experimental devices and to define relevant tests.

The pollutant in question is trichloroethylene, the porous media is a medium sand and the experiments were implemented in column.

Once, an analytical method was available to quantify aqueous, gaseous and sorbe TCE, predominant transfers mechanisms were quantified separately especially with diffusion experiments through a sand at three different water contents (dry, residual saturation and saturated). Then, these mechanisms have been coupled in a TCE transfer experiment in sand with a hydrostatic water content profile. Each type of test was dimensioned, if it's possible duplicated and interpreted with the multiphasic software Comsol whose flow equation was changed to consider the gravity driven convection.

By strictly controlling external factors and boundary conditions, it was possible to carry out transfer experiments reproducible and interpretable with a volatile and reactive compound in a very permeable porous medium. A good reproducibility of experimental results by simulation was achieved with minor changes in basic parameters: report permeability on viscosity, tortuosity (Millington, 1959) and aerodynamics conductivity curve setting parameter (Thomson et al., 1997). This work has resulted in a fine understanding of gas transfers in the vadose zone, especially in the capillarity fringe.
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https://tel.archives-ouvertes.fr/tel-00377724
Contributor : Solenn Cotel <>
Submitted on : Wednesday, April 22, 2009 - 5:28:14 PM
Last modification on : Friday, October 23, 2020 - 4:41:40 PM
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  • HAL Id : tel-00377724, version 1

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Solenn Cotel. Etude des transferts sol/nappe/atmosphère/bâtiments ; Application aux sols pollués par des Composés Organiques Volatils. Physique [physics]. Université Joseph-Fourier - Grenoble I, 2008. Français. ⟨tel-00377724⟩

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