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Dynamique sédimentaire et mécanismes de transferts des métaux/métalloïdes dans un écosystème contaminé : la Rade de Toulon

Abstract : Mediterranean coastal ecosystems are exposed to several contamination sources (agricultural, industrial and touristic activities) impacting the environmental compartments (water column, sediment, biota ...) at various scales. Some previous studies showed, in particular, that the sediments of Toulon Bay present important contents of several contaminants, which may have non-negligible impacts on the coastal ecosystem, and which require further studies to better understand the processes governing the potential pollutants transfer to the surrounding environment. In this context, the objectives of this PhD are to study the processes controlling the inorganic pollutants dynamic in the sediment column and at the sediment/water interface and to assess their potential remobilization to the water column. Three main modes of dispersion can lead to contaminants remobilization : (1) the early diagenesis mobilizing nutrients, trace metals and metalloids, (2) the contaminants remobilization during sediment resuspension events, and (3) the diffusive flux from the sediment/water interface due to the sedimentary mobility of contaminants. To achieve its goals, this PhD project combines in-situ approaches (interface coring, extraction, treatment and analysis of porewater and solid fractions, ...), laboratory experiments (kinetic monitoring of contaminants remobilization during sediment resuspension, sequential extractions, ...), modeling tools (chemical speciation calculation, dissolved/particulate partition simulation, depth profiles simulation, organic matter reactivity, …) and contamination sources tracking and transfer between various environmental compartments using Pb stable isotopes. These studies were performed in close cooperation with the LASEM and with the contribution of different partners (EPOC/University of Bordeaux, Ruđer Bošković Institute/Croatia, CAM/University of Lausanne/Suisse, IFREMER, IRSN, …).
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Submitted on : Tuesday, March 17, 2015 - 2:41:06 PM
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Duc Huy Dang. Dynamique sédimentaire et mécanismes de transferts des métaux/métalloïdes dans un écosystème contaminé : la Rade de Toulon. Autre. Université de Toulon, 2014. Français. ⟨NNT : 2014TOUL0008⟩. ⟨tel-01132547⟩

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