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Flux de matières en suspension, de mercure et de PCB particulaires dans le Rhône, du Léman à la Méditerranée

Abstract : The knowledge of particulate contaminant fluxes transported by rivers is crucial for the management of environmental pollution, but it is compromised by signicant technological, methodological and scientic difficulties. Through an intensive observational effort made possible by the Rhône Sediment Observatory, this research focused on the spatio-temporal dynamics of particulate contaminant - mercury and PCBs - fluxes in the Rhône and its major tributaries as regards suspended particulate matters (SPM) contribution : the Arve, Saône, Isère and Durance rivers. The chosen and validated observation strategy is based on the quasi-continuous monitoring of discharge, SPM concentrations (by turbidimetry) and contaminant contents (using sediment integrative traps), associated with samples of reference (manual sampling or centrifugation) and a detailed characterization of particles in terms of grain-size and organic carbon contents. From measured and existing data, the study of the spatio-temporal variability of parameters and of their factors of influence allowed us to propose and validate suitable methods for the quantication of particulate fluxes at the event, annual and inter-annual scales. These results provide a new insight into the particulate fluxes throughout the Rhône river system and highlight the importance of major hydro-sedimentary events and of the interactions with hydro-power schemes. Such complex hydro-sedimentary processes motivate the improvement of the numerical simulation of the Rhône river.
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  • HAL Id : tel-02600006, version 1
  • IRSTEA : PUB00041370

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M. Launay. Flux de matières en suspension, de mercure et de PCB particulaires dans le Rhône, du Léman à la Méditerranée. Sciences de l'environnement. Doctorat hydraulique et chimie environnementale, Université Lyon I, 2014. Français. ⟨tel-02600006⟩

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