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Registros recuperados: 8
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Fast hydrodynamic model for medium- and long-term dispersion in seawater in the English Channel and southern North Sea, qualitative and quantitative validation by radionuclide tracers ArchiMer
Bailly Du Bois, Pascal; Dumas, Franck.
The database for medium- and long-term model validation using Sb-125 released by the La Hague reprocessing plant includes 1400 measurements performed between 1987 and 1994 in the English Channel and the North Sea and data for each release since 1982. Antimony-125 has a conservative behaviour in water masses over a period of several years. These data can be used qualitatively and quantitatively to compare the measured concentrations with the calculated ones and quantities of tracers. Tritium measurements are also available for model calibration. A two-dimensional hydrodynamic model has been developed to allow repetitive long-term simulations. This model uses a database of residual tidal currents calculated using the Lagrangian barycentric method [Salomon,...
Tipo: Text Palavras-chave: North Sea; English Channel; European Continental Shelf; Tritium; Sb 125; Radioactive tracer; Wind stress; Calibration; Modelling.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-731.pdf
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Hydrodynamic modelling of short-term dispersion in a macro-tidal sea, validation by high-resolution radionuclide tracer measurements ArchiMer
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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Improving Knowledge of Water-Mass Circulation in the English Channel Using Radioactive Tracers ArchiMer
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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Inventory and distribution of tritium in the oceans in 2016 ArchiMer
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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Modélisation hydrodynamique de la dispersion à court terme dans une mer macrotidale: validation par des mesures à haute résolution de radiotraceurs solubles ArchiMer
Bailly Du Bois, Pascal; Dumas, Franck.
DISPRO project aims to validate hydrodynamic models dispersion parameters by field data for the short-term (hours to week) and short distances (100 meters to 30 km). This project is based on a 2D instantaneous currents model with a mesh size of 110 m, coupled with high frequency field data collected in the release plume. At this step of the works, measurements confirm the reliability of the model during six hours following a release. This validation made possible developpement of models with known incertitude to simulate dispersion of dissolved substances in realistic conditions for normal or accidental situations in macrotidal seas.
Tipo: Text Palavras-chave: Validation; Tritium; Dispersion; North sea; Hydrodynamic model; Validation; Tritium; Dispersion; Manche; Modèle.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/acte-564.pdf
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Numerical modelling of heterogeneous sediment transport: new insights for particulate radionuclide transport and deposition ArchiMer
Rivier, Aurélie; Le Hir, Pierre; Bailly Du Bois, Pascal; Laguionie, Philippe; Morillon, Mehdi.
A sediment transport module which solves simultaneously bedload and suspended load is developed, in a context of multiclass sediment transport. Different approaches are used to simulate each transport mode: (i) bedload transport results from divergence of transport capacity and (ii) suspension transport is solved using erosion and settling fluxes associated with advection/diffusion equation. A focus is made on the significance of hiding and exposure processes in case of heterogeneous sediment bed. Their influence is strong on bedload sediment transport, and induces specific trends of sediment sorting in sand dunes. The application to heterogeneous sediment dynamics in the macrotidal area of the Normand Breton Gulf (English Channel), show that hiding and...
Tipo: Text Palavras-chave: Sediment transport; Numerical modelling; Hiding; Exposure; Bedload; Suspension.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00394/50580/51274.pdf
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TRANSMER, hydrodynamic model for medium- and long-term simulation of radionuclides transfers in the English Channel and southern North Sea ArchiMer
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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TRANSMER, un modèle hydrodynamique rapide et précis pour la simulation à moyen et long terme des transferts de radionucléides en Manche et dans le sud de la Mer du Nord ArchiMer
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. It has been qualitatively and quantitatively validated by 1400 measurement of 125Sb in seawater. 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).
Tipo: Text Palavras-chave: English Channel; North Sea; Radionuclide; Concentration; Dispersion; Dissolved substances; Seawater; Hydrodynamic model; Modèle; Sb 125; Dispersion; Mer du Nord; Manche.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/acte-563.pdf
Registros recuperados: 8
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