STATIAL RISK REPRESENTATION OF HYDRO CARBON POLLUTION PROPAGATION IN SUBSURFACE-APPLICATION TO FLUVIOUS AQUIFERS ; Représentation spatiale des risques de propagation des pollutions par hydrocarbures en milieu souterrain : application en milieu alluvial

This PhD-thesis work is intended for the elaboration of a methodology for risk analysis of accidentai hydrocarbon pollution. This methodology is based on the integration of modelling tools for complex phenomena of subsurface pollution by LNAPL (Light Non Aqueous Phase Liquids). In unsaturated zone, polyphase character ofhydrocarbon pollution is evident while air, water and oil phases coexist. Modelling of multiphase pollution propagation is limited by numerous uncertainties introduced by phenomena ofnonlinearity. Nevertheless, spatial and temporal scale is smaller than in saturated zone. By th... Mehr ...