Caractérisation des particules ferrugineuses dans la Seine avec le magnétisme environnemental

Abstract : Iron and its compounds, in particular iron (hoxyhydr)oxides are ubiquitous in both nature and human activity, and are sensitive to environmental conditions. They can hence be used as environmental source and process tracers.This thesis focuses on tracing the human activities impact in the ferruginous compound of the suspended particulate matter (SPM) in the Seine River (France) using environmental magnetism tools.SPM sampling was conducted along the Seine path and its tributaries during different hydrological contexts. Magnetic properties were measured to characterize the ferruginous magnetic particles and to examine their relationship with the environment in which they have been formed.The main magnetic carrier is magnetite. It is concentrated in the fine sediment fraction and its magnetic properties can be used to trace the sediment load and hydrodynamic processes of the Seine.Increases in concentration and grain size of magnetite particles are associated to urbanization and industrial activities which are sources of anthropogenic particles. Significant variations can be observed between upstream and downstream of confluences and in the temporal scale and can be associated to hydrodynamic processes such as dilution, accretion, transport and re-suspension of the ferruginous particles.
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Dariouche Kayvantash. Caractérisation des particules ferrugineuses dans la Seine avec le magnétisme environnemental. Ingénierie de l'environnement. PSL Research University, 2016. Français. ⟨NNT : 2016PSLEM056⟩. ⟨tel-01699335⟩

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