Consulta: subjectFacets:"Tritium"
Registros recuperados: 5
Data/hora: 13/06/2024 02:09:59

Improving Knowledge of Water-Mass Circulation in the English Channel Using Radioactive Tracers
Provedor de dados: 5
Autores: 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

In-situ database toolbox for short-term dispersion model validation in macro-tidal seas, application for 2D-model
Provedor de dados: 5
Autores: Bailly Du Bois, P.; Dumas, Franck; Solier, L.; Voiseux, C.
Appropriate field data are required to check the reliability of hydrodynamic models simulating the dispersion of soluble substances in the marine environment. This study deals with the collection of physical measurements and soluble tracer data intended specifically for this kind of validation. The intensity of currents as well as the complexity of topography and tides around the Cap de La Hague in the centre of the English Channel make it one of the most difficult areas to represent in terms of hydrodynamics and dispersion. Controlled releases of tritium-in the form of HTO-are carried out in this area by the AREVA-NC plant, providing an excellent soluble tracer. A total of 14,493 measurements were acquired to track dispersion in the hours and days...
Tipo: Text
Palavras-chave: Modelling; Data collection; Tritium; Dispersion; Tidal dynamics; English Channel.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00077/18775/16484.pdf

Modélisation hydrodynamique de la dispersion à court terme dans une mer macrotidale: validation par des mesures à haute résolution de radiotraceurs solubles
Provedor de dados: 5
Autores: 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

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
Provedor de dados: 5
Autores: 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

Gaining insight into Clipperton's lagoon hydrology using tritium
Provedor de dados: 5
Autores: Jean-baptiste, Philippe; Fourre, Elise; Charlou, Jean-luc; Donval, Jean-pierre; Correge, Thierry.
Historical descriptions of the Clipperton lagoon appear to converge on the fact that it became isolated from the surrounding ocean around 1858. Since then, because of the high precipitation rate which largely exceeds evaporation in this region of the eastern tropical Pacific, a brackish lens has formed on top of the saline oceanic waters. In 1980, literature data show that the thickness of this water body was reaching 14 m. During the 2005 Etienne's Clipperton expedition, we collected lagoon water on two vertical profiles. Salinity, delta O-18 and tritium analyses were performed on these samples with the objective of gaining further insight into the lagoon hydrology and age of the deep waters. The upper 15 m were characterized by low salinities (5.4 +/-...
Tipo: Text
Palavras-chave: Oxygen isotopes; Tritium; Enclosed lagoon hydrology; Clipperton atoll.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6457.pdf