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Registros recuperados: 14
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A biophysical model of S. aurita early life history in the northern Gulf of Guinea ArchiMer
Kone, Vamara; Lett, Christophe; Penven, Pierrick; Bourles, Bernard; Djakoure, Sandrine.
S. aurita is the most abundant small pelagic fish in the northern Gulf of Guinea. Its reproduction and recruitment depend crucially on environmental conditions. We developed a biophysical model of S. aurita early life history by coupling offline an individual-based model with the regional oceanic modeling system (ROMS). We used this model to investigate the main factors driving variability in eggs and larval dispersal and survival in the northern Gulf of Guinea. Precisely, individuals were released from different spawning areas along the coast and tracked for a period of 28 days corresponding to their planktonic phase. Individuals that remained in the coastal recruitment areas at an age more than 7 days, at which they can supposedly actively retain...
Tipo: Text Palavras-chave: Hydrodynamic model; Individual-based model; S. aurita early life stage; Recruitment; Upwelling; Northern Gulf of Guinea.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00357/46790/46656.pdf
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Circulation around La Reunion and Mauritius islands in the south-western Indian Ocean: A modeling perspective ArchiMer
Pous, Stephane; Lazure, Pascal; Andre, Gael; Dumas, Franck; Halo, Issufo; Penven, Pierrick.
Circulation around both islands is dominated by westward propagating features The predominant time scale of variability of currents and SSH is 60 days There is local generation of eddies in the lee of the islands due to topography
Tipo: Text Palavras-chave: Ocean circulation; Hydrodynamic model; La Reunion; Eddies; Rossby waves.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00195/30624/29073.pdf
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Coupling hydrodynamic and individual-based models to simulate long-term larval supply to coastal nursery areas ArchiMer
Rochette, Sebastien; Huret, Martin; Rivot, Etienne; Le Pape, Olivier.
For many marine fish species, recruitment is strongly related to larval survival and dispersal to nursery areas. Simulating larval drift should help assessing the sensitivity of recruitment variability to early life history. An individual-based model (IBM) coupled to a hydrodynamic model was used to simulate common sole larval supply from spawning areas to coastal and estuarine nursery grounds at the population scale in the eastern Channel on a 14-yr time series, from 1991 to 2004. The IBM allowed each particle released to be transported by currents from the hydrodynamic model, to grow with temperature, to migrate vertically giving stage development, and possibly to die according to drift duration, representing the life history from spawning to...
Tipo: Text Palavras-chave: Eastern Channel; Hydrodynamic model; Individual-based model; Larval supply; Nursery grounds; Recruitment variability; Solea solea.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00085/19598/17236.pdf
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Detecting hydrological landscapes over the Bay of Biscay continental shelf in spring ArchiMer
Planque, Benjamin; Lazure, Pascal; Jegou, Anne-marie.
A complex set of hydrodynamical structures co-exist over the Bay of Biscay continental shelf. These structures, which can spread over a limited spatial range (10s of km) and last for periods ranging from days to months, influence the rates and nature of biological production. They need to be accurately described before the mechanisms linking hydrodynamics to production can be unraveled. Such description generally requires not only 3D observations of hydrological fields (temperature, salinity, density), but also a description of how these fields vary with time. This is hardly achievable with current means of field observation but can be mimicked by hydrodynamic model simulations. Using simulations from a 3D hydrodynamic model, we developed a methodology...
Tipo: Text Palavras-chave: Bay of Biscay; Hydrology; Hydrodynamic model; Spring; Typology.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/00000/10933/7575.pdf
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Etude des processus hydrodynamiques et écophysiologiques de la dynamique d'une algue invasive : Valonia aegagropila (C. Agardh) dans la lagune de Salses-Leucate ArchiMer
Cesmat, Ludovic.
Since 1980, the expansion of a green macro-alga: Valonia aegagropila (C Agardh) is observed in Salses-Leucate lagoon (France). It is currently distributed in the north of the lagoon with important biomasses (40 gDW/m²) eroding the cover of Zostera noltii. The free form of the alga can be transported with the surface or bottom currents depending on seasons. It multiplies mainly by vegetative reproduction. There are few studies on the ecophysiological capacities of V. aegagropila. This work tries to answer why (physiological adaptation) and how (mechanical process of transport) the alga invaded the lagoon, with an approach including observations, experiments in controlled environment and biological and hydrodynamic models. The growth capacities depend on...
Tipo: Text Palavras-chave: Model of alga growth; Invasive alga; Model of Droop; Intern quota model; Hydrodynamic model; Invasive specie; Écophysiology; Population dynamic; Lagoon of Salses Leucate; Green alga; Valonia aegagropila; Modèle à quota interne; Modèle hydrodynamique; Espèce invasive; Écophysiologie; Algue verte; Dynamique des populations; Lagune de Salses Leucate; Valonia aegagropila.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/these-2453.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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Identification des flux de civelles (Anguilla anguilla) à partir des relations d’allométrie en fonction des conditions hydrodynamiques de l’estuaire de l’Adour ArchiMer
De Casamajor, Marie-noelle; Prouzet, Patrick; Lazure, Pascal.
Biological data on glass eels (Anguilla anguilla) were collected during two successive sampling periods from November to March (1996-1997 and 1997-1998) on the Adour estuary. As for other estuaries, decrease in length (mean of 73.5 to 67.4 mm) and weight (mean of 3.5 to 2.6 dg) of glass eels were observed. Weight and length characteristics were used to identify groups of glass eels. These groups were well distinguished during the first sampling period but some overlaps appeared in the second one. Fluctuations of static allometry and similarity coefficients showed successive glass eels arrivals in the lower part of the estuary during the two seasons. We used fluctuations of the index of similarity in the second period to describe arrivals of glass-eels...
Tipo: Text Palavras-chave: Biométrie; Modèle hydrodynamique; Flux migratoires; Civelle; Estuaire de l’Adour; Biometry; Hydrodynamic model; Migratory flow; Glass-eels; Adour estuary.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00188/29897/28346.pdf
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Implementation of a 3D Coupled Hydrodynamic and Contaminant Fate Model for PCDD/Fs in Thau Lagoon (France): The Importance of Atmospheric Sources of Contamination ArchiMer
Dueri, Sibylle; Marinov, Dimitar; Fiandrino, Annie; Tronczynski, Jacek; Zaldivar, Jose-manuel.
A 3D hydrodynamic and contaminant fate model was implemented for polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in Thau lagoon. The hydrodynamic model was tested against temperature and salinity measurements, while the contaminant fate model was assessed against available data collected at different stations inside the lagoon. The model results allow an assessment of the spatial and temporal variability of the distribution of contaminants in the lagoon, the seasonality of loads and the role of atmospheric deposition for the input of PCDD/Fs. The outcome suggests that air is an important source of PCDD/Fs for this ecosystem, therefore the monitoring of air pollution is very appropriate for assessing the inputs of these contaminants. These...
Tipo: Text Palavras-chave: PCDD/F; Thau lagoon; POPs; Fate model; Hydrodynamic model.
Ano: 2010 URL: https://archimer.ifremer.fr/doc/00003/11441/7995.pdf
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Modélisation des flux sédimentaires charriés dans la baie du Mont-Saint-Michel (Manche, France) ArchiMer
Ehrhold, Axel; Guillou, Sylvain; Auffret, J; Garlan, T; Nguyen, K.
A study of the sediment bedload in the Mont-Saint-Michel bay is presented here. It combines the use of a 2DH numerical model and a pattern of sediment bedload transport established on the analysis of the statements of sidescan imagery combined with a dense groundwork of sedimentary grab samples. Results show the role of tidal currents asymetry in the realistic bioclastic sand transfert from the subtidal environment to the coast and the divergence of sedimentary dynamic between the maritime bay to the West and the tidal delta to the East. This in-shore transfer is responsable of the Holocene prism construction. The model reproduces tidal sedimentary dynamics with the immediate surroundings of the Mont-Saint-Michel. It shows the interest of the modeling of...
Tipo: Text Palavras-chave: Mont Saint Michel bay; Sediment; Sidescan; Bedload transport; Hydrodynamic model; Baie du Mont Saint Miche; Sédiment; Sonar latéral; Débit massique; Modèle hydrodynamique.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/publication-522.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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Opciones de manejo del acuífero de Guadalupe, B. C., para un uso sustentable del agua. Colegio de Postgraduados
Flores Zavala, Georgina Joselyn.
El Valle de Guadalupe es la principal región vitivinícola del país, cuyo desarrollo se basa en el recurso hidráulico subterráneo. Sin embargo, en las últimas décadas se ha intensificado la explotación de este recurso para uso agrícola y urbano provocando el abatimiento de los niveles freáticos y poniendo en riesgo su existencia. El presente trabajo tuvo como objetivo simular en un plazo de 25 años (2010-2035) la extracción del acuífero de Guadalupe con un modelo hidrodinámico en dos situaciones: a) si el uso del agua continua como hasta ahora y b) con una reducción de la mitad de extracción actual del 50% los pozos presentes y el resto extrayendo la cantidad de agua actual. El modelo hidrodinámico matemático se baso principalmente en la formulación de un...
Palavras-chave: Acuífero; Niveles freáticos; Sobreexplotación; Modelo hidrodinámico; Aquifer; Groundwater levels; Overexploitation; Hydrodynamic model; Maestría; Hidrociencias.
Ano: 2012 URL: http://hdl.handle.net/10521/733
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Sole larval supply to coastal nurseries: Interannual variability and connectivity at interregional and interpopulation scales ArchiMer
Savina-, Marie; Lunghi, Mathias; Archambault, B.; Baulier, Loic; Huret, Martin; Le Pape, Olivier.
Simulating fish larval drift helps assess the sensitivity of recruitment variability to early life history. An individual-based model (IBM) coupled to a hydrodynamic model was used to simulate common sole larval supply from spawning areas to coastal and estuarine nursery grounds at the meta-population scale (4 assessed stocks), from the southern North Sea to the Bay of Biscay (Western Europe) on a 26-yr time series, from 1982 to 2007. The IBM allowed each particle released to be transported by currents, to grow depending on temperature, to migrate vertically depending on development stage, to die along pelagic stages or to settle successfully on a nursery, representing the life history from spawning to metamorphosis. The model outputs were analysed to...
Tipo: Text Palavras-chave: Hydrodynamic model; Individual-based model; Larval supply; Nursery grounds; Recruitment variability; Solea solea; Metapopulation; English Channel; Bay of Biscay; Southern North Sea.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00297/40775/39782.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: 14
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