Fate of rhone river sediments in the Gulf of Lions : relative contribution of the plume dynamics versus storm-induced sediment resuspension
The fate of riverine sediments in Mediterranean coastal environments is driven by two mechanisms : direct transfers associated to the plume dynamics and indirect transfers related to sediment resuspension by storms. Quantifying and modelling sediment fluxes in the Gulf of Lions first requires to better understand the processes associated with these mechanisms. This study will particularly focus on the flocculation processes assumed to control suspended sediment features and explain the presence of sediment in suspension both near the surface and near the bed over extended areas. The influence of primary production and organic matter content inthis dynamics will be investigated. This work will benefit from in situ measurementsrecently conducted by the laboratory and his partners (IRSN/CEFREM/LOV/LSCE). These observations will contribute to improve the formulation of key sediment processes in the MARS3D hydrodynamics and sediment transport model implemented on the Gulf of Lions. Model results will allow to i) quantify sediment fluxes from the Rhone river mouth to the continental shelf and ii) investigate the relative contributions of the plume dynamics and the storms to the fluxes from theshort time scale (storm/flood) to the annual scale.
Keywords : Sediment Fluxes, Plume dynamics, Extrem events, Rhône river, Gulf of Lion, Numerical modelling
This work is funded by the ANR AMORAD project dedicated to the fate of radionucleides into the continental and coastal environment. The PhD student will have the opportunity to collaborate with CEFREM (F. Bourrin - in situ measurements), LOV (David Doxaran - ocean color data), IRSN (S Charmasson - deposition patterns) and LSCE (C Rabouille - deposition patterns).
Position in Ifremer, Brest, starting in October 2014 for 3 years. Supervised by Romaric Verney (Ifremer, Brest) and Claude Estournel (LA, Toulouse)
Profile : The candidate must be experienced in coastal physical oceanography with a background in numerical modelling.
If interested please send CV, cover letter and 2 references to Romaric Verney : firstname.lastname@example.org
Deadline for application : End of june 2014, but could be extended if the position is not filled.