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| Registros recuperados: 10 | |
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| Bailly Du Bois, Pascal; Dumas, Franck; Solier, L. |
| This work aims to validate the dispersion parameters of hydrodynamic models for the short term (hour to week), and short distances (100 m - 30 km), by using high precision and high frequency measurements of tritium obtained in the release plume. An instantaneous 2D hydrodynamic model has been developed with a mesh size of 110m and an area of 5050 km. More than 7,000 samples have been collected and measured for tritium concentrations in 2002 and 2003. Currents and bathymetric measurements, as well as drifters observations complete these measurements. Results confirm the efficiency of the hydrodynamic model, main differences being attributable to bathymetry incertitudes. After calibration, the model gives accurate results during six hours following a... |
| Tipo: Text |
Palavras-chave: Dispersion parameter; Plume; Macro tidal sea; Hydrodynamic model. |
| Ano: 2005 |
URL: https://archimer.ifremer.fr/doc/2005/publication-544.pdf |
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| Bailly Du Bois, Pascal; Rozet, M; Thoral, K; Salomon, Jean-claude. |
| New tools are now available to make more accurate deteminations of radio-tracer distribution : - Repositioning of station locations at the same tide reference-time, giving a homogeneous spatial data set, coupled with the possibility of interpolating and quantifying the amounts of dissolved radioactivity flowing through the English Channel. - The first measurements of tritium (3H) in seawater on a large scale in the English Channel demonstrate that this fully conservative radionuclide is a clearly identifiable marker of industrial releases. Recent campaigns carried out during the FluxManche II CCE (1994) programme show the general distribution of dissolved radionuclides 137Cs, 134Cs, 125Sb and 3H in the English Channel and Irish Sea. The re-utilization of... |
| Tipo: Text |
Palavras-chave: English channel; Tritium; Radioactive tracer; Watre mass circulation. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/1997/acte-559.pdf |
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| Oms, Pierre-emmanuel; Bailly Du Bois, Pascal; Dumas, Franck; Lazure, Pascal; Morillon, Mehdi; Voiseux, Claire; Le Corre, Cedric; Cossonnet, Catherine; Solier, Luc; Morin, Pascal. |
| Tritium concentrations in oceans were compiled from the literature, online databases and original measurements in order to determine the global distribution of tritium concentrations according to latitude and depth in all oceans. The total inventory of tritium decay corrected in 2016 has been estimated using evaluation of the natural and artificial contributions in 23 spatial subdivisions of the total ocean. It is determined equal to 26.8 ± 14 kg including 3.8 kg of cosmogenic tritium. That is in agreement with the total atmospheric input of tritium from nuclear bomb tests and the natural inventory at steady-state estimated from natural production rates in the literature (27.8–29.3 kg in the Earth). We confirm the global increase in tritium according to... |
| Tipo: Text |
Palavras-chave: Radionuclide; Tracer; Database; Background concentration. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00470/58157/60653.pdf |
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| Bennis, Anne-claire; Furgerot, Lucille; Bailly Du Bois, Pascal; Dumas, Franck; Odaka, Tina; Lathuilière, Cyril; Filipot, Jean-francois. |
| Modelling three-dimensional wave-current-turbulence interactions in extreme tidal environments is still challenging and necessary for the development of the tidal industry, particularly for the dimensioning of tidal converters. Following this objective, we focus our study on the most energetic tidal site in Western Europe, the Alderney Race (France). Due to the strong tidal current at this location, wave-current interactions were poorly studied by the past and often neglected. We propose to assess how they impact the Alderney Race hydrodynamic by the use of numerical modelling and in-situ measurements. In this study, the following wave-current interactions were observed: (i) Stokes drift effects inducing an increase/decrease in the current depending on the... |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00599/71155/73092.pdf |
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| Bailly Du Bois, Pascal; Dumas, Franck. |
| TRANSMER hydrodynamic model simulates dispersion of dissolved substances in seawater at the scale of the English Channel and the south of the North Sea with a mesh size of one kilometre and a time step of 30 minutes. This model evaluates the medium- and long-term consequences of releases of soluble pollutants in the marine ecosystem under normal or accidental conditions, at a very low computation cost (it takes less than one hour to simulate one year). It has been qualitatively and quantitatively validated by 1400 measurements of 125Sb in seawater in the English Channel and the North Sea. Budgets of measured and simulated radionuclide quantities are balanced for theses seas. The correlation factor between individual measurements in seawater and calculation... |
| Tipo: Text |
Palavras-chave: Pollutant; Ecosystem; Radionuclides; Dispersion; Dissolved substances; Hydrodynamic model. |
| Ano: 2005 |
URL: https://archimer.ifremer.fr/doc/2005/publication-552.pdf |
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| Registros recuperados: 10 | |
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