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Theses

Transferts multi-échelles des apports continentaux dans le golfe de Gascogne

Abstract : During chronic or accidental releases of tritium from nuclear facilities to seawater or through river discharges, the dispersion of radionuclides in the marine environment is subject to multiple dispersion processes. These processes depend on the area under consideration and forcings such as tide, wind, heat and freshwater flows.Predicting the dispersion of tritium in the Bay of Biscay requires taking into account all these processes and the various inputs: the North Atlantic surface waters, discharges from nuclear facilities, freshwater inputs and exchanges with the atmosphere. The main objective of this thesis is to improve the knowledge on the hydrodynamics of the Bay of Biscay by coupling in-situ measurements of a water masses tracer: the tritium, with a hydrodynamic dispersion model (MARS 3 D).To achieve this goal, samplings were carried out in the Bay of Biscay and the two main continental contributors of tritium: the Loire and Gironde rivers.The combined use of salinity and tritium as tracers of continental waters makes it possible to differentiate into an innovative way the inputs from these two rivers at the scale of the continental shelf. The measured and simulated stocks of tritium within the shelf provided a first estimate of the residence time of continental water in the Bay of Biscay.
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Submitted on : Thursday, November 7, 2019 - 4:18:17 PM
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Pierre-Emmanuel Oms. Transferts multi-échelles des apports continentaux dans le golfe de Gascogne. Sciences de la Terre. Université de Bretagne occidentale - Brest, 2019. Français. ⟨NNT : 2019BRES0038⟩. ⟨tel-02354264⟩

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