Titre :
|
The infiltration and movement of immiscible chemicals in unsaturated soil
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Auteurs :
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S. Guigard ;
W. Stiver ;
R. Zytner
|
Type de document :
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article/chapitre/communication
|
Année de publication :
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1996
|
Format :
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p. 1123-1130
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Langues:
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= Anglais
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Catégories :
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HYDRAULIQUE
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Mots-clés:
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INFILTRATION
;
MILIEU POREUX
;
MILIEU NON SATURE
;
COMPOSE ORGANIQUE
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Résumé :
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Organic chemical spills pose a threat to air, soil, surface water and groundwater quality. As such, prompt remedial action is required to minimize the environmental impact. While the principles behind the infiltration of a spilled chemical are understood, there is a paucity of data for parameter estimation for specific compounds and soil conditions. Laboratory simulations have been conducted with hexane and PCE in prepared soil columns to address this need. Both infiltration times and liquid front movement were measured as was the influence of soil type and soil water content on the spill behaviour. Infiltration times for both chemicals into a given soil were similar. The chemicals infiltrated fastest into the more permeable soil. The liquid front movement in air dry soils followed a log-log relationship with time that is similar to the Green and Ampt model. Increasing soil water content had a significant effect on both the infiltration times and liquid front movement: the infiltration times increased, while the chemical front moved faster through the soil column.
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Source :
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Environmental technology, vol.17
|