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Registros recuperados: 21
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The influence of variability in larval dispersal on the dynamics of a marine metapopulation in the eastern Channel ArchiMer
Ellien, Celine; Thiebaut, Éric; Barnay, Anne-sophie; Dauvin, Jean-claude; Gentil, Franck; Salomon, Jean-claude.
In the English Channel, the polychaete Pectinaria in koreni forms isolated populations confined in bays and estuaries. To determine the influence of larval dispersal variability on the observed stock fluctuations of the three major Pectinaria koreni populations reported along the French coasts of the eastern Channel, larval dispersal was simulated using a 2D hydrodynamical lagrangian model integrating both the tidal residual and the wind-driven circulation. Year-to-year fluctuations of adult stocks were established from benthic surveys carried out between 1973 and 1998. Larval dispersal patterns vary between populations according to the relative importance of tidal advection and eddy diffusion so that local larval retention is maximal where tidal advection...
Tipo: Text Palavras-chave: Pectinaria koreni; Metapopulation; Modelling; Recruitment; Larval dispersal; Pectinaria koreni; Métapopulation; Modélisation; Recrutement; Dispersion larvaire.
Ano: 2000 URL: https://archimer.ifremer.fr/doc/2000/publication-535.pdf
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Coupled 2-d and 3-d modeling of coastal hydrodynamics ArchiMer
Lazure, Pascal; Salomon, Jean-claude.
The hydrodynamics of coastal zones often reflect the combined action of tides, winds and density differences. Usual two-dimensional numerical models are only partly suited to the study of such mechanisms. A set of two 2-D and 3-D numerical models is described here. Its main characteristics are: an automatic coupling, a specific procedure for shoaling banks, a reduced vertical coordinate system, and a resolution by finite differences. As an example, the complete set is applied to the region of the Loire and Vilaine estuaries in South Brittany (France). Results prove to be coherent with experimental data and enhance our knowledge of the local hydrodynamics.
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Ano: 1991 URL: http://archimer.ifremer.fr/doc/00101/21248/18862.pdf
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Computed residual flow through the Dover Strait ArchiMer
Salomon, Jean-claude; Breton, Marguerite; Guegueniat, Pierre.
A two-dimensional numerical model was used for the empirical deduction of a mathematical expression of water flow through the Dover Strait, for all conditions of tide, wind and ocean slope. The theoretical results were correlated with sea measurements of radioactive tracers discharged at La Hague cape. Nine actual years (1983-1991) were then examined, determining an average annual flow of 114000 mas-1 with a very high monthly variability, but with little difference from one year to the next. These residual currents being highly sensitive to weather conditions, the mildness of the past few years has occasioned a decrease in fluxes towards the North Sea
Tipo: Text Palavras-chave: Manche; Pas de Calais; Débit; Modèle; Marée; Channel; Dover Strait; Flow; Model; Tide.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/1993/publication-542.pdf
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Simulation numérique de bouchon vaseux en estuaire. Application à la Gironde ArchiMer
Penhoat, Yd; Salomon, Jean-claude.
Tipo: Text
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00122/23368/21195.pdf
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Courants residuels de maree dans la Manche ArchiMer
Salomon, Jean-claude; Breton, Marguerite.
A two-dimensional mathematical model of the Channel has been used to reveal tide-related advective physical structures, at synoptic time scales. Results show a complete circulation pattern composed of a nearly axial "river" carrying a water flux of about 27,000 m super(3)/s, for an average tide, from the Atlantic to the North Sea and lateral gyres of various intensities, linked to the topography. The modest velocity of the mean flow makes it probably subject to strong temporal modifications by meteorological forcings. Conversely, some strong gyres may play an important role on the residence time of particles and the local memorization of water mass characteristics.
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Ano: 1991 URL: http://archimer.ifremer.fr/doc/00268/37883/35964.pdf
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Mathematical Model of Mont Saint Michel Bay ArchiMer
Salomon, Jean-claude; Breton, Marguerite.
The present modelling task is part of a more general research multinational program dedicated to salt marshes ecosystem studies. This program, named EUROSSAM - European Salt Marshes Modelling - has been selected by the European Community authorities for funding inside the core program Environment and Climate (ref. ENV4-CT97-0436).
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Ano: 2000 URL: http://archimer.ifremer.fr/doc/00082/19367/16961.pdf
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Modèle tridimensionnel de circulation et de dispersion en zone côtière à marée. Premiers essais : cas schématique et baie de Seine ArchiMer
Thouvenin, Benedicte; Salomon, Jean-claude.
In order to reproduce and investigate the marine circulation in the coastal tidal zone, and especially its three dimensional nature, it appeared interesting to develop a numerical mode! which could take account of the real bottom topography and the variations of the free surface. Navier-Stokes equations are solved in a straight forward manner, generalizing a finite difference technique already used in two-dimensional vertical models. To test the computational program, the mode! was applied to a number of flat bottom schematic basins, where we reproduced wind driven currents and tide propagation. Then we considered the particular case of a real channel and, finally, density currents associated with a salty wall. Mode) results are compared to theoretical...
Tipo: Text Palavras-chave: Modèle; Courant; Tridimensionnel; Seine; Côtier; Model; Current; Three-dimensional; Seine; Coastal.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/00113/22440/20127.pdf
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Modèle général du plateau continental Nord Européen ArchiMer
Salomon, Jean-claude; Breton, Marguerite.
Ce rapport présente un modèle courantologique bidimensionnel du plateau continental nord-ouest européen. On discute la situation géographique des limites du modèle et on examine sa réponse vis-à-vis des trois forçages extérieurs : la marée, le vent, les gradients de pression
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Ano: 1990 URL: http://archimer.ifremer.fr/doc/00079/19071/16666.pdf
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Suspended particulate matter fluxes through the Straits of Dover, English Channel: observations and modelling ArchiMer
Lafite, Robert; Shimwell, Susan; Grochowski, Nicolas; Dupont, Jacques; Nash, Linda; Salomon, Jean-claude; Cabioch, Louis; Collins, Michael; Gao, Shu.
Suspended Particulate Matter (SPM) concentrations at various levels within the water column, together with salinity and temperature, were measured using water samples collected from six stations across the Straits of Dover. The sampling programme covered a 16-month period, undertaken during 23 cruises. On the basis of the spatial variability in the concentrations, the water bodies are divided by several boundaries, controlled by tidal and wind conditions. Within the water column, SPM concentrations were higher near the sea bed than in the surface waters. Throughout the cross-section, maximum concentrations occurred adjacent to the coastlines. Temporal variability in the SPM concentration exists on daily and seasonal scales within the coastal waters (4.2 to...
Tipo: Text Palavras-chave: English Channel; Straits; Transport mechanisms; Flux; Suspended particulate matter; Manche; Détroit; Mécanismes de transport; Flux; Matières en suspension.
Ano: 2000 URL: https://archimer.ifremer.fr/doc/2000/publication-527.pdf
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Etude mathématique de la dispersion des flux d'azote provenant du Quillimadec et de l'Alanan ArchiMer
Salomon, Jean-claude; Breton, Marguerite.
Des marées vertes se produisent fréquemment en baie de Tréssény. Les algues dérivent en majorité dans la zone de marnage, entre la cote zéro et la limite supérieure de l'estran. Ces événements semblent liés à l'apport de sels nutritifs par les deux cours d'eau qui se jettent dans la baie ou à proximité : le Quillimadec et l'Alanan.
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Ano: 1999 URL: http://archimer.ifremer.fr/doc/00082/19370/16964.pdf
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A modelling study of the respective role of hydrodynamic processes and larval mortality on larval dispersal and recruitment of benthic invertebrates: example of Pectinaria koreni (Annelida : Polychaeta) in the Bay of Seine (English Channel) ArchiMer
Ellien, C; Thiebaut, E; Dumas, Franck; Salomon, Jean-claude; Nival, Paul.
The dispersal of Pectinaria koreni larvae released from the eastern Bay of Seine (English Channel) was studied using a two-dimensional hydrodynamic model which integrates tides, wind-driven currents and eddy diffusion, in order to examine the influence of environmental forcing and mortality on larval population dynamics. A broad agreement between predicted larval dispersal for two spawning events observed in 1987 and field data suggests that numerical modelling may be useful to analyse processes involved in the transport and the dynamics of larval populations. Larval mortality may be as important as hydrodynamic processes on larval losses for the adult population. Tides and eddy diffusion had some effects on larval dispersal, but wind forcing and the...
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Ano: 2004 URL: https://archimer.ifremer.fr/doc/00000/10747/7641.pdf
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Etude par modèles mathématiques de la circulation marine entre Quiberon et Noirmoutier ArchiMer
Lazure, Pascal; Salomon, Jean-claude.
The marine circulation between Quiberon and Noirmoutier is due to the combined effects of the tides, winds and density circulation induced by the discharges of the Vilaine and Loire rivers. These effects have been studied with two mathematical models, a two-dimensional (vertically integrated) one and a three-dimensional one. The tide has been shown to be the most important phenomenon at short time scale. Its effects are locally variable mainly because of topographic control. The tidal influence decreases significantly at long time scale and the residual circulation depends mainly on meteorological and hydrological conditions. The wind-induced circulation is mostly three-dimensional and appears locally to be the main dynamic process. During high flood, the...
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Ano: 1991 URL: http://archimer.ifremer.fr/doc/00245/35578/34111.pdf
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Courants de marée en mer d'Iroise ArchiMer
Mariette, V; Rougier, G; Salomon, Jean-claude; Simon, B.
Tipo: Text
Ano: 1982 URL: http://archimer.ifremer.fr/doc/00120/23151/20996.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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Dynamique de marée dans le golfe normand-breton ArchiMer
Orbi, A; Salomon, Jean-claude.
Tipo: Text
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00108/21884/19475.pdf
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Etude de la qualité du milieu marin littoral en Martinique (Baie de Fort de France) ArchiMer
Breton, Marguerite; Caprais, Marie-paule; Derrien, A.; Douillet, P; Dubois, E; Dupray, E; Gourmelon, Michele; Guillerm, Denise; Kempf, Marc; Lazure, P.; Le Guyader, Soizick; Le Menn, Remi; Menard, Dominique; Pommepuy, Monique; Salomon, Jean-claude.
Les départements et territoires d'outre mer sont généralement l'objet d'enjeux économiques importants, et de conflits d'activités liés au développement touristique, aquacole, agricole et industriel. Les études font généralement état d'une lente dégradation de l'environnement marin avec diminution des coraux et de la faune associée, au profit d'une augmentation de la couverture algale. On constate parfois un envasement ou un ensablement des sites, la présence dans l'eau de polluants organiques, dont des pesticides, des métaux ainsi que des microorganismes d'origine fécale. En Martinique, ce dernier aspect, lié à l'assainissement des zones rurales, urbaines et touristiques est actuellement considéré comme une préoccupation majeure pour les prochaines années....
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Ano: 1994 URL: http://archimer.ifremer.fr/doc/00132/24303/22301.pdf
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An atlas of long-term currents in the channel ArchiMer
Salomon, Jean-claude; Breton, Marguerite.
The last diagram shows the magnitude of the dispersion coefficient. This enables a dilution computation to be added to the advective part of dissolved substances and microorganism movements.
Tipo: Text Palavras-chave: CHANNEL; CURRENT; MODEL; TIDE; LAGRANGE.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00099/21068/18693.pdf
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Perspectives offertes par la communication entre un modèle hydrodynamique et un SIG pour l'aide au diagnostic environnemental : caractérisation de la dynamique et la qualité des masses d'eaux côtières. ArchiMer
Loubersac, Lionel; Salomon, Jean-claude; Breton, Marguerite; Durand, Christophe; Gaudineau, Caroline.
This paper presents a set of solutions based on the synergy between GIS and a numerical model to help in diagnosis and decision making for water quality related matters. After an overview of the model features, it describes the computer interface (ModelView) implemented as an extension of the Arc View (ESRI) GIS System to provide operational data communication between the model and the GIS in vector or raster form. The paper particularly focuses on changes in the quality of coastal waters from river discharges. It looks at the spatio-temporal representation of this behaviour and the spatial analysis of sensitive areas that can be impacted. Examples are given of a French coastal area subject to strong human pressure, i.e. marine cultures and recreational...
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Ano: 2000 URL: http://archimer.ifremer.fr/doc/00189/30011/28492.pdf
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Etude océanographique appliquée au S.A.U.M. de la rade de Brest ArchiMer
Pommepuy, M.; Manaud, F.; Monbet, Y.; Allen, G.; Salomon, Jean-claude; Gentien, P.; L''Yavang, J..
An oceanographic survey of the bay of Brest (France) was conducted in 1977, together with an hydrological study of the rivers entering the bay. Samples were collected from rivers. Analysis of dissolved nutrients (nitrate, phosphate, ammonium, reactive silicate) and tentative solute budjets (observed and calculated) for nitrogen and phosphorous in drainage basin were performed.
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/1979/publication-6014.pdf
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Etude de l'estuaire de la Seine - Modélisation numérique des phénomènes physiques ArchiMer
Salomon, Jean-claude; Le Hir, Pierre.
Les zones côtières, et les estuaires en particulier, fournissent au bien-être de l'homme et à son activité économique une aide très appréciable. Contrairement au milieu terrestre pauvre en eau, et au milieu marin pauvre en éléments nutritifs, les estuaires riches de ces deux constituants sont un lieu de vie privilégié. On connait le rôle de frayère et de nurserie qu'ils jouent pour de très nombreuses espèces. Ces estuaires sont actuellement utilisés comme collecteurs des rejets industriels et domestiques. Bien que ces rejets lorsqu'ils sont convenablement traités et dilués ne soient pas obligatoirement néfastes, il est de première utilité de pouvoir juger de leurs effets selon leur nature, leur localisation et leur importance, pour ne pas mettre en danger...
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Ano: 1981 URL: http://archimer.ifremer.fr/doc/00105/21638/19219.pdf
Registros recuperados: 21
Primeira ... 12 ... Última
 

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