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Registros recuperados: 22
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3D modelling of seasonal evolution of Loire and Gironde plumes on Biscay Bay continental shelf ArchiMer
Lazure, Pascal; Jegou, Anne-marie.
A 3D model of the Atlantic shelf has been developed and applied to study shelf dynamics and evolution of hydrology. The model takes the combined effects of tide, wind, river discharges and surface heat flux into account. Time scales vary from 1 day to several years. Following a brief description of the model and forcing variables, the behaviour of the Loire and Gironde plumes is described, first for winter and spring, then over a period of several years, under realistic forcing. The results show that plume evolution depends on the high Variability of river runoff and winds. Model simulations performed over 7 years (1990 to 1996) have highlighted several features of these plumes: 1) In early winter and periods of high river runoff, plumes usually spread...
Tipo: Text Palavras-chave: Panache; Modélisation; Dynamique du plateau continental; Golfe de Gascogne; River plume; Modelling; Shelf dynamics; Bay of Biscay.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/publication-847.pdf
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Analysis of salinity measurements near islands on the French continental shelf of the Bay of Biscay ArchiMer
Lazure, Pascal; Jegou, Anne-marie; Kerdreux, Michel.
The Bay of Biscay is characterised by large fresh water inputs from two major rivers, the Loire and the Gironde, with a mean discharge of about 900 m(3)/s. To describe the spatial and temporal variability of the Loire and Gironde plumes, continuous salinity measurements were made at 4 locations on French coastal islands over periods lasting at least two years. These islands are located at a distance from the large local gradients linked to local inputs. Whereas sea surface salinity in the centre of the Bay of Biscay is 35.6, salinities at the coast vary between about 35 in summer to occasionally less than 30 in late winter or in spring. Minimum salinities do not occur at the same time along the coast, indicating a strong spatial gradient. Near the Loire...
Tipo: Text Palavras-chave: Bay of Biscay; Continental shelf; River plume; Seasonal variability; Salinity; Hydrology.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3957.pdf
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Cartographie de la température de surface de la mer sur les cotes bretonnes ArchiMer
Jegou, Anne-marie.
Des thermographies infrarouges AVHRR/NOAA sont analysées pour identifier les zones qui se rechauffent en priorité au printemps sur les côtes bretonnes. Les résultats montrent que les eaux côtières se réchauffent davantage dans les zones de faible profondeur et/ou de faibles courants. La plupart de ces zones correspondent à des zones à risque vis-à-vis des proliférations excessives d'algues.
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Ano: 1993 URL: http://archimer.ifremer.fr/doc/00082/19305/16899.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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Golfe Normano-Breton. Bilan des connaissances ArchiMer
Blanchard, Michel; Chardy, Pierre; Chaussepied, Marcel; Dao, Jean-claude; Le Hir, Pierre; Jegou, Anne-marie; Larsonneur, C.; Loarer, Ronan; Manaud, Francois.
Ce document a été élaboré dans le cadre de la préparation d'un programme d' "étude régionale intégrée" du golfe normano-breton. Réalisé dans des délais très courts, il ne constitue pas un inventaire exhaustif des travaux effectués dans le golfe mais une illustration par grands secteurs disciplinaires de l'état actuel des connaissances. Son objectif est de cerner les domaines à développer dans le cadre d'une programmation poly-disciplinaire orientée vers la gestion de l'espace littoral. La présentation par disciplines fondamentales de l'océanographie (physique, sédimentologie, biologie) est associée à un bilan de l'utilisation du milieu, faisant apparaître la diversité et la complexité des problèmes à résoudre. En effet, point privilégié entre la Manche...
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Ano: 1982 URL: http://archimer.ifremer.fr/doc/00450/56186/57739.pdf
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Golfe Normano-Breton - Etude Régionale Intégrée ArchiMer
Le Hir, Pierre; Bassoullet, Philippe; Erard, E.; Blanchard, Michel; Hamon, Dominique; Jegou, Anne-marie.
Ce rapport en 6 volumes est le résultat d'une étude pluridisciplinaire (6 thèmes correspondant aux volumes du rapport), réalisée sur un secteur géographique bien délimité, présentant des caractéristiques physiques et biologiques particulières (très fort marnage, grande hétérogénéité des fonds, forte production biologique à base de mollusques filtreurs…), et siège d'activités humaines importantes et diversifiées (essentiellement basées sur l'exploitation des ressources du milieu). L'étude fait suite à un Livre Blanc établi en 1982, synthétise les données existantes, et les complète par des travaux originaux sur la connaissance des mécanismes naturels, en particulier de ceux qui ont une relation directe ou indirecte avec les activités humaines (processus...
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Ano: 1986 URL: http://archimer.ifremer.fr/doc/00047/15837/13240.pdf
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Hydrographical variability on the French continental shelf in the Bay of Biscay, during the 1990s ArchiMer
Puillat, Ingrid; Lazure, Pascal; Jegou, Anne-marie; Lampert, Luis; Miller, P.
A synthesis of 9 years of hydrographic measurements, acquired during approximately 25 cruises (1992-2000) on the French continental shelf of the Bay of Biscay, is presented. The main focus is upon salinity distribution, as it is little known in this area. The whole of the data set covers I I months of the year, with some sampling fields repeated several times a year, for multiple years. This time-series allows temperature and salinity distributions to be studied together with their seasonal, inter-annual and mesoscale variability. The seasonal trend in temperature can be described in three stages, which are in agreement with past studies. Thermal stratification occurs between May and mid-September in a layer similar to 50 m in thickness, whereas the...
Tipo: Text Palavras-chave: Upwelling; Cold pool; River plumes; Seasonal variability; Salinity; Hydrography.
Ano: 2004 URL: https://archimer.ifremer.fr/doc/2004/publication-779.pdf
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Initiation of winter phytoplankton blooms within the Gironde plume waters in the Bay of Biscay ArchiMer
Labry, Claire; Herbland, Alain; Delmas, Daniel; Laborde, P; Lazure, Pascal; Froidefond, J; Jegou, Anne-marie; Sautour, B.
Thermostratification and seasonal Light increase are generally considered the first causes of phytoplankton spring blooms in temperate waters. The objective of this study is to confirm the existence of winter phytoplankton blooms, responsible for the early exhaustion of phosphate, within the Gironde plume waters (southeast Bay of Biscay), and to understand what may initiate them so early. Two cruises, BIOMET 2 and BIOMET 3, were carried out respectively in early (8 to 21 January) and late winter 1998 (25 February to 11 March). An increase of phytoplankton biomass (chl a) between the 2 cruises and non-conservative nutrients observed in late winter confirm an early phytoplankton growth both in the Gironde plume and adjacent oceanic waters. Among factors that...
Tipo: Text Palavras-chave: Vertical attenuation coefficient; Halostratification; Light availability; Winter blooms.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/publication-810.pdf
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Inventaire des sites potentiels pour l'aquaculture sur le littoral des Cotes-du Nord : fascicule 1: aquaculture nouvelle ArchiMer
Couteaux, B; Jegou, Anne-marie; Merceron, Michel; Piriou, Jean-yves.
This report is the first stage of the Inventory of Potential Sites for Aquafarming along the Côtes-du-Nord shoreline. This type of inventory was conducted previously in Seine-Maritime, in Basse-Normandie, in Finistère, and along the central part of the Atlantic coast. This kind of study is generally motivated by two findings: -the growing use of the shoreline area for various activities -the need to set aside suitable sites for the development of aquafarming. In order to make consistent development choices, it is important to know as well as possible the aquafarming potential sites that we have available, their size, their nature, their geographic distribution, as well as the state of the techniques to be implemented. In Brittany itself, a quick...
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Ano: 1979 URL: http://archimer.ifremer.fr/doc/1979/rapport-2660.pdf
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Inventaire des sites potentiels pour l'aquaculture sur le littoral du Finistère. 2ème phase : Aquaculture nouvelle, fichier ArchiMer
Merceron, Michel; Jegou, Anne-marie; Couteaux, B; Piriou, Jean-yves.
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Ano: 1979 URL: http://archimer.ifremer.fr/doc/1979/rapport-2663.pdf
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Inventaire des sites potentiels pour l'aquaculture sur. le littoral du Finistère : fascicule 1 : aquaculture nouvelle ArchiMer
Merceron, Michel; Jegou, Anne-marie; Couteaux, B; Piriou, Jean-yves.
This report is the first stage of the Inventory of Potential Sites for Aquafarming along the Finistère shoreline. This type of inventory was conducted previously in Seine-Maritime, in Basse-Normandie, and along the central part of the Atlantic coast. This kind of study is generally motivated by two findings: -the growing use of the shoreline area for various activities, -the need to set aside suitable sites along the shoreline for the development of aquafarming. In order to make consistent growth choices, it is important to know as well as possible the aquafarming potential that we have available, their size, their nature, their geographic distribution, as well as the degree of maturity of the techniques to be implemented. In Brittany itself, a quick...
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Ano: 1978 URL: http://archimer.ifremer.fr/doc/1978/rapport-2661.pdf
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Inventaire des sites potentiels pour l'aquaculture sur le littoral du Finistère : première phase (Etude bibliographique et reconnaissance terrain) Fascicule 1 : Aquaculture nouvelle ArchiMer
Merceron, Michel; Jegou, Anne-marie; Couteaux, Bertrand; Piriou, Jean-yves.
Producing the Inventory of Potential Sites for Aquaculture along the Finistère Shoreline was decided by the Département's Regional Council with the goal of integrating aquafarming in the best way possible into the variety of businesses that are based along the coastal zone. Aquafarming, in order for it to exist tomorrow, needs to be taken into account today as far as preservation of sites, and this must be done with two aspects in mind: - land, on shore; - water quality (which implies maritime and land constraints). In this context, the Regional Council has entrusted the Centre National pour l'Exploitation des Océans with a study that will make it possible to define the aquafarming potential of the Finistère shoreline. It was decided to split this study...
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Ano: 1978 URL: http://archimer.ifremer.fr/doc/1978/rapport-2655.pdf
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La dispersion des apports de la Gironde sur le plateau continental. Données in situ, satellitales et numériques ArchiMer
Hermida, J; Lazure, Pascal; Froidefond, Jm; Jegou, Anne-marie; Castaing, P.
Coastal waters are generally a product of mixing between continental and oceanic originated water masses. Near river mouth areas, as in the Gironde estuary, oceanic waters are modified by the influence of freshwater discharge that introduces suspended and dissolved substances, including pollutants. Within PNOC (Programme National d'Oceanographie Cotiere) our objective is to determine the extent of the influence of the Gironde estuary on to the Aquitanian continental shelf. Several cruises for collecting hydrological data have been carried out in this area. The data of every cruise were coupled with a NOAA-11 satellite passage. The recorded images have been analysed and were compared with the results given by a 3D mathematical model. The interaction among...
Tipo: Text Palavras-chave: Hydrologie; Circulation; Eau côtière; Estuaire de la Gironde; Hydrology; Circulation; Coastal water; Gironde estuary.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/publication-849.pdf
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Low salinity intrusions in the western English Channel ArchiMer
Kelly Gerreyn, B; Hydes, D; Jegou, Anne-marie; Lazure, Pascal; Fernand, L; Puillat, I; Garcia Soto, C.
Low salinity (< 35) surface waters (LSSW) at the southern entrance to the western English Channel (48.5 degrees N, 5.1 degrees W, near Ushant) were observed in late winter (March-April) in three successive years (2002-04) during near continuous ship of opportunity operations. The source of the LSSW is the northward spreading plumes from the Loire (47.5 degrees N, 2.5 degrees W) and Gironde (45.6 degrees N, 1.2 degrees W) along the French Atlantic coast. Fastest plume travel times were associated with northeasterly winds, consistent with Ekman theory. Differences between years in the mean winter (January-March) combined river discharges (D) was consistent with the minimum salinities (S-min) of the LSSW (2004: D = 4211 m(3) s(-1), S-min = 33.68; 2003: D =...
Tipo: Text Palavras-chave: Bay of Biscay; English Channel; River plume; Ferrybox; Low salinity.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3524.pdf
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Mesoscale hydrological variability induced by northwesterly wind on the French continental shelf of the Bay of Biscay ArchiMer
Puillat, I; Lazure, Pascal; Jegou, Anne-marie; Lampert, Luis; Miller, P.
On the French continental shelf of the Bay of Biscay the variability of the surface salinity distribution has been mainly investigated at the seasonal and inter-annual scales. Here, new mesoscale features such as lower-salinity lenses observed in model results are investigated by hydrological measurements acquired during 8 cruises (1997-2000). These lenses are 50-80 km wide and similar to 30 m thick and occur during westerly to northerly wind events that push offshore the less saline water of river Plumes. These water masses detached from the coast are replaced with upwelled saltier water at the coast, so coastal upwelling is often observed at the same time along Landes and southern Brittany coasts. We show that in addition to the influence of seasonal and...
Tipo: Text Palavras-chave: River plume; Upwelling; Lens; Mesoscale; Salinity.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3958.pdf
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Parcs et réserves en milieu marin - Houat-Hoedic ArchiMer
Jegou, Anne-marie; Creze, J.y.
L'étude de l'Archipel de HOUAT-HOEDIC, situé au large du golfe du Morbihan sur le littoral Sud de la Bretagne, fait partie des six monographies confiées au C.N.E.X.O. par le Ministère de la Culture et de l'Environnement. Ces six études sont destinées à dégager l'ensemble des problèmes d'ordre écologique, économique et social qui pourraient se poser lors de la création de parcs ou de réserves naturelles en milieu marin. Les six études sont méthodologiques et ne sont donc pas préliminaires à la création de parcs marins sur les sites en question qui n'ont été choisis par le Ministère de l'Environnement que pour leur diversité. S'il était décidé de constituer à HOUAT-HOEDIC un parc naturel en milieu marin, il serait indispensable de réaliser de véritables...
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Ano: 1978 URL: http://archimer.ifremer.fr/doc/00132/24310/22308.pdf
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Parcs et réserves en milieu marin - Iles Chausey ArchiMer
Jegou, Anne-marie; Creze, J.y..
Le travail sur le site des Iles CHAUSEY fait partie des six études confiées au CNEXO par le Ministère de l'Environnement. Les six études sont destinées à dégager l'ensemble des problèmes d'ordre écologique, économique et social qui pourraient se poser lors de la création de parcs ou de réserves naturelles en milieu marin. Les six études sont méthodologiques et ne sont donc pas préliminaires à la création de parcs marins sur les sites en question qui n'ont été choisis par le Ministère de l'Environnement que pour leur diversité. Si il était décidé de constituer à CHAUSEY un parc naturel en milieu marin en complément du parc terrestre envisagé, il serait indispensable de réaliser de véritables études de projet au cours desquelles seraient consultées toutes...
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Ano: 1977 URL: http://archimer.ifremer.fr/doc/00132/24294/22292.pdf
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Parcs et réserves en milieu marin - La Baie de Bourgneuf ArchiMer
Jegou, Anne-marie; Creze, J.y.
La Baie de BOURGNEUF est située sur le littoral atlantique juste au Sud de l'estuaire de la LOIRE dont elle est séparée par la pointe de ST GILDAS. Cette baie ne serait qu'une simple ondulation du trait de côte si l'Ile de NOIRMOUTIER ne la séparait de l'océan sur une vingtaine de kilomètres. Ainsi ne subsiste-t-il que deux ouvertures, l'une au Nord qui s'étend sur une largeur de 12 kilomètres entre la pointe de l'HERBAUDIERE et celle de ST GILDAS, l'autre au Sud, large de 800 mètres, qui n'est en fait qu'un étroit goulet entre la pointe de la FOSSE et celle de NOTRE DAME DE MONT. Du point de vue milieu naturel - comme ailleurs du point de vue historique et administratif - la baie fait le contact entre le littoral breton (falaises, rias, criques) et les...
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Ano: 1977 URL: http://archimer.ifremer.fr/doc/00132/24309/22307.pdf
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Possibilités de création de parcs et réserves en milieu marin sur les côtes atlantiques françaises ArchiMer
Creze, J.y.; Jegou, Anne-marie.
In France, there is a plentiful of legal institutions and procedures to regulate coastal activities. However, to provide an intact protection of selected marine areas, valued for their unique ecological character, a great deal of thought has been given on the possibility of establishing marine sanctuaries.
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/1979/publication-6012.pdf
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Recueil de données hydrologiques (Température-Salinité-Oxigène) en Manche - Atlantique ArchiMer
Blanchard, Michel; Jegou, Anne-marie.
Ce recueil de données hydrologiques est destiné à orienter la recherche de sites favorables, sur le littoral Manche - Atlantique, pour des activités d'aquaculture. Ce n'est pas un inventaire des sites potentiels, ni un recueil de tous les paramètres nécessaires à cette activité. Il s'agit ici d'une approche globale au niveau d'une région, permettant une première sélection basée sur des paramètres hydrologiques : température de l'eau de mer, salinité et taux d'oxygène dissous.
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Ano: 1987 URL: http://archimer.ifremer.fr/doc/00081/19259/16854.pdf
Registros recuperados: 22
Primeira ... 12 ... Última
 

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