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

Duffa, Celine; Dufois, Francois; Coudray, Sylvain
November 2011
Ocean Dynamics;Nov2011, Vol. 61 Issue 11, p1811
Academic Journal
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.


Related Articles

  • SIMULATION OF CAESIUM-137 (137Cs) LOCAL DIFFUSION AS A CONSEQUENCE OF THE CHERNOBYL ACCIDENT USING HOTSPOT. Cacciotti, Ilaria; Aspetti, Pio Ciro; Cenciarelli, Orlando; Carestia, Mariachiara; Di Giovanni, Daniele; Malizia, Andrea; D'Amico, Fabrizio; Sassolini, Alessandro; Bellecci, Carlo; Gaudio, Pasquale // Defence S&T Technical Bulletin;2014, Vol. 7 Issue 1, p18 

    The accident at the Chernobyl nuclear reactor in 1986 is considered as the most severe event that has ever occurred in the nuclear power industry, due to the considerable amounts of radioactive material released into the environment. The main purpose of this work is to simulate the dynamics of...

  • Long-term transfer of 137Cs from soil to mushrooms in a semi-natural environment. Mascanzoni, D. // Journal of Radioanalytical & Nuclear Chemistry;Nov2009, Vol. 282 Issue 2, p427 

    The radioactive contamination following the Chernobyl accident resulted in high concentrations of 137Cs in several mushrooms species. Mushroom samples were collected in a forest environment between 1986 and 2007 and the transfer of 137Cs to two edible species, Suillus variegatus and Cantharellus...

  • Promotion of the lower limit of detection of gamma emitting nuclides in radioaerosol samples after Fukushima accident. Wang, Jinglong; Jiang, Yifei; Huang, Dekun; Wen, Tingyu; Du, Jinzhou; Zhang, Jing // Journal of Radioanalytical & Nuclear Chemistry;Jun2012, Vol. 292 Issue 3, p1297 

    Through placement in a few hours after collecting radioaerosol samples (in Shanghai) after Fukushima nuclear power plant (NPP) accident, radionuclides with gamma-emitting rays can be found to be nuclides (I/Te, I/Te) other than I, Cs because of the decrease in background baseline after the...

  • Environmental dose assessment using Ecolego: case study of soil from Japan. Krisanangkura, P.; Itthipoonthanakorn, T.; Udomsomporn, S. // Journal of Radioanalytical & Nuclear Chemistry;Sep2013, Vol. 297 Issue 3, p443 

    From the Fukushima incident, a number of radionuclides were released, causing radioactive contamination to the environment. Depending on their own half-lives, the radionuclides, however, will decay over time. During the decay, those radionuclides can be transferred to the ecosystem and,...

  • Decay Distance and Residence Time of an Air Pollutant for Different Atmospheric Thermal Stability Categories. Alseroury, Fathia. A. // Australian Journal of Basic & Applied Sciences;2011, Vol. 5 Issue 6, p618 

    In this work, we represent an analytical treatment for estimating the decay distance of an air pollutant and consequently, its residence time (RT) as it moves horizontally in downwind direction. The treatment to derive the decay distance is based on analytical solution of the steady-state...

  • Physics with Open Charm Mesons at PANDA. Sokolov, A.; Gillitzer, A.; Ritman, J. // AIP Conference Proceedings;2005, Vol. 796 Issue 1, p63 

    We present a study of the physics performance of the PANDA detector based on Monte-Carlo simulations. The possibility to measure D, D* and DsJ*(2317) mesons has been investigated. A reliable detection of open charm decay products of charmonium decays and sufficient level of background...

  • Wind-forced circulation model and water exchanges through the channel in the Bay of Toulon. Dufresne, Christiane; Duffa, Céline; Rey, Vincent // Ocean Dynamics;Feb2014, Vol. 64 Issue 2, p209 

    A hydrodynamic model of the Bay of Toulon has been developed for use as a post-accident radionuclide dispersion simulation tool. Located in a Mediterranean urban area, the Bay of Toulon is separated into two basins by a 1.4-km long seawall. The Little Bay is semi-enclosed and connected to the...

  • PRELIMINARY SIMULATIONS OF COASTAL CURRENTS FROM THE AREA OF CONSTANÅ¢A TO THE BORDER BETWEEN ROMANIA AND BULGARIA. Dinu, Irina; Bajo, Marco; Stănică, Adrian; Dan, Sebastian; Maximov, Gabriela; Umgiesser, Georg // GeoEcoMarina;12/1/2010, Vol. 16 Issue 1, p67 

    This study is focused on the southern Romanian coast, confined by the city of Constanta (north) and Vama Veche village, at the border with Bulgaria (south). Here the coastal morphology is influenced by nearshore current circulation, disrupted during the last few decades by severe human...

  • The onset of inelastic collapse in a one-dimensional granular gas. McNamara, Sean // Granular Matter;Apr2012, Vol. 14 Issue 2, p121 

    We examine the onset of inelastic collapse for a cluster of 10 ≤ N ≤ 50 grains colliding with a fixed wall. When the restitution coefficient ẽ is less than a threshold, the cluster does not bounce off the wall, but comes to rest after an infinite number of collisions. Near the...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics