An operational model to simulate post-accidental radionuclide transfers in Toulon marine area: preliminary development

Type Article
Date 2011-11
Language English
Author(s) Duffa Celine1, Dufois Francois3, Coudray Sylvain2
Affiliation(s) 1 : IRSN (Institut de Radioprotection et Sureté Nucléaire), Centre IFREMER, Zone Portuaire du Brégaillon, 83507 La Seyne sur Mer, France
2 : Ifremer, Zone Portuaire du Brégaillon, 83507 La Seyne sur Mer, France
3 : Univ Cape Town, Mare Inst, Dept Oceanog, ZA-7701 Rondebosch, South Africa
Meeting 15th Biennial Joint Numerical Sea Modelling Group Conference (JONSMOD), Delft, NETHERLANDS, MAY 10-12, 2010
Source Ocean Dynamics (1616-7341) (Springer Heidelberg), 2011-11 , Vol. 61 , N. 11 , P. 1811-1821
DOI 10.1007/s10236-011-0429-0
WOS© Times Cited 9
Keyword(s) Bay of Toulon, Radionuclides, Dispersion, MARS
Abstract As part of its development of post-accident management tools, the French Institute for Radiological Protection and Nuclear Safety is setting up a model to simulate radionuclide dispersion in the Toulon marine area (one of France's main military ports). The model is based on the MARS 3D code developed by IFREMER. It reproduces hydro-sedimentation phenomena in the Bay of Toulon with a horizontal spatial resolution of 100 m and 30 vertical sigma levels and also factors in radioactive decay and dissolved/particulate distribution of the radionuclides studied. With no tide, the major currents in this area are generated by the wind. The model effectively reproduces the resulting hydrodynamic phenomena, which were measured throughout the summer of 2009 in the channel that links the Little Bay to the Large Bay of Toulon. When the Mistral (wind from the West/Northwest) blows, a surface current quickly appears, which pushes water southwards from the Little Bay, and which is offset by a bottom current (upwellings). When the wind blows from the East, the currents move in the opposite direction, and southeasterly waves, dependent on wind strength and fetch, occur in the Large Bay. Here, we give an example of the simulated dispersion of radionuclides released directly into the surface waters near the Arsenal, demonstrating the constraint relative to dispersion generated by the half-closed configuration of the Little Bay. Sediment in the Little Bay also forms an area where the most highly reactive radionuclides would accumulate, and where the lack of waves has the effect of considerably limiting the phenomena of resuspension.
Full Text
File Pages Size Access
11 1 MB Access on demand
Author's final draft 16 1 MB Open access
Top of the page