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IRSN, Institut de radioprotection et de sûreté nucléaire

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Understanding and analyzing the hydro-sedimentary processes in the Bay of Toulon. Contribution for modelling the dispersion of radionuclides

​Christiane Dufresne has defended her thesis on 24th November 2014 in Toulon-Var University.

Document type > *Mémoire/HDR/Thesis

Keywords >

Research Unit > IRSN/DEI/SESURE/LERCM

Authors > DUFRESNE Christiane

Publication Date > 24/11/2014

Summary

This doctoral research aims to enhance knowledge of the hydro-sedimentary processes in the Bay of Toulon and to represent these processes through a post accidental managing tool, developed to simulate the dispersion of radionuclides. This work is based on a multidisciplinary strategy, using numerical modelling and in situ measurements to study the complex problem of contaminants in the marine environment.

Hydrodynamic of the Bay and water mass exchanges through the channel have been studied. Results are highly linked to the atmospheric conditions and the water exchange times of the Little Bay range from two to six days, depending on wind conditions. Recorded data in the Las and Eygoutier Rivers led to the description and the estimation of the catchment yields to the Bay, poorly studied before. With one ton of particulate matter annually discharged by the Las River, the Little Bay seems to be a sedimentation area. In case of accidental release of radionuclides, this area appears to be a trapping zone.

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