Consulta: subjectFacets:"Current"
Registros recuperados: 10
Data/hora: 07/06/2024 05:32:05

Variations of the Antarctic Circumpolar Current intensity during the past 500 ka
Provedor de dados: 5
Autores: Mazaud, A.; Michel, Elisabeth; Dewilde, F.; Turon, J. L.
We examine the past variations of the Antarctic Circumpolar Current (ACC) by using variations in size and abundance of the magnetic grains deposited by this current at a site east the Kerguelen-Crozet plateau. Core MD00-2375G was taken at a midlatitude site during the ANTAUS cruise conducted in 2000 by the French R/V Marion Dufresne. Marine isotope stages (MIS) down to MIS 13 are identified, and an age model is derived from a correlation to the ice core isotopic record obtained from EPICA in Antarctica. Continuous records of abundance and size of the magnetic grains were obtained using environmental magnetism methods. Results show a strong modulation of the ACC flow intensity in response to glacial and interglacial cycles. The low abundance and the small...
Tipo: Text
Palavras-chave: Antarctic; Current; Past; Cycles.
Ano: 2010
URL: https://archimer.ifremer.fr/doc/00231/34190/32874.pdf

Upper-layer circulation in the eastern Equatorial and South Atlantic Ocean in January-March 1995
Provedor de dados: 5
Autores: Mercier, Herle; Arhan, Michel; Lutjeharms, Johann.
The upper-layer circulation in the eastern basin of the South Atlantic was studied from hydrographic and direct velocity measurements along WOCE lines A11, A13 and A14. A13 and A14 provide quasi-meridional samplings of the equatorial, subequatorial and subtropical circulation regimes. A13 was carried out along the African coast at about 600 km offshore from it, and A 14 along the nominal longitude 9degreesW. A11 intersects the Cape Basin between 46degreesS in the west and 30degreesS in the east. Transport estimates were derived from direct velocity measurements and a box inverse model. In the equatorial eastern Atlantic, the Equatorial Undercurrent (EUC) transport decreases from 25x10(6) m(3) s(-1) at 9degreesW to 13x10(6) m(3) s(-1) at 5degreesE....
Tipo: Text
Palavras-chave: Hydrography; Current; Circulation; South Atlantic; Equatorial Atlantic.
Ano: 2003
URL: https://archimer.ifremer.fr/doc/2003/publication-460.pdf

Courantométrie du site d'élevage de salmonides en grande rade de Cherbourg
Provedor de dados: 5
Autores: Merceron, Michel; Gaffet, Jean-dominique.
Current recordings were performed near the middle of the great breakwater of Cherbourg ("Grande Digue", inner side) during two months of the 1993 summer. The data show that, in this site, the currents drive mostly westwards. They are driving eastwards only during the first half of flood. In the tidal cycle, there is only one current slack, at law tide. The most important velocities are observed during the high tides : 0.5 to 0.6 m.s-1• The fish net pens, which are located there, tend to speed up the undemeath currents and, thus, contribute to scatter the farm effluents. The temperature and salinity records are also displayed. _
Tipo: Text
Palavras-chave: Courant; Cage; Élevage; Poisson; Cherbourg; Current; Net pen; Farm; Fish; Cherbourg.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00082/19330/16924.pdf

Caractérisation des composantes hydrodynamiques d'une lagune mésotidale, le Bassin d'Arcachon.
Provedor de dados: 5
Autores: Plus, Martin; Maurer, Daniele; Stanisiere, Jean-yves; Dumas, Franck.
Introduction and objectives of the study: Understanding the operation modes of the coastline systems requires the study of the hydrodynamics responsible for transporting the whole of the chemical and biological elements of which they are composed. The idea of maintaining a close connexion between the physics, biology, geology and chemistry of the oceans is not new, and was for that matter the subject of a note in the first report of the International Council for the Study of the Oceans (ICSS) in 1902 (Sverdrup et al., 1954):  " it was seen from the beginning that the study of the physical conditions, of the chemical nature of the ocean waters, of the currents, etc., was of the greatest importance for the investigation of the problems connected with life,...
Tipo: Text
Palavras-chave: France; Atlantic north east; Arcachon basin; Modelling; Measuring; Current; Hydrodynamic.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/rapport-2352.pdf

Estimating the wreckage location of the Rio-Paris af447
Provedor de dados: 5
Autores: Ollitrault, Michel; Blanke, Bruno; Chen, Changsheng; Diansky, Nicolai; Drevillon, Marie; Greiner, Eric; Lefevre, Fabien; Limeburner, Richard; Lezaud, Pascal; Louazel, Stéphanie; Nurser, George; Paradis, Denis; Scott, Robert.
Tipo: Text
Palavras-chave: Current; Equator; Wind; RIO-PARIS AF447.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00027/13777/10915.pdf

Modèle tridimensionnel de circulation et de dispersion en zone côtière à marée. Premiers essais : cas schématique et baie de Seine
Provedor de dados: 5
Autores: 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

Température, Salinité, Vent, Courantologie des marges du Mor-Bras
Provedor de dados: 5
Autores: Kerdreux, Michel.
In the coastal zone between the estuaries of Loire R. and Vilaine R., IFREMER has made four moorings from february to march and from june to september. The speed and steering of currents are precised, and the temperature and salinity are given. The Direction of national météorologie furnished the date necessary to trace wind speed and steering.
Tipo: Text
Palavras-chave: Loire; Vilaine; Courant; Vent; Loire R.; Vilaine R; Current; Wind.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/00081/19270/52489.pdf

The Alderney Race: General hydrodynamic and particular features
Provedor de dados: 5
Autores: Bailly Du Bois, P; Dumas, Franck; Morillon, M; Furgerot, L; Voiseux, C; Poizot, E; Mear, Y; Bennis, Anne-claire.
This study presents an overview of the main hydrodynamic features of the Alderney Race strait based on in-situ measurements and 2D hydrodynamic model simulations. The strait encompasses a large amplitude of tidal properties (tidal range and tidal wave propagation) and particularly strong currents exceeding 5 m.s-1 with associated counter currents and gyres. Variations in depth, sea bottom roughness, coastal topography and current orientation around the La Hague Cape provide access to a large variety of original hydrodynamic regimes. Some are revealed as locations with a 0.4 m drop in the mean sea level associated with strong average currents. A resonance effect associated with the offshore currents can also be observed close to the coasts. The "St Martin...
Tipo: Text
Palavras-chave: Alderney Race; La Hague Cape; Current; Tide; Hydrodynamics; Model.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00641/75286/75639.pdf

Analyse du rôle de l'IFREMER dans l'instruction du dossier Salmor
Provedor de dados: 5
Autores: Drévès, Luc.
This report describes the contribution made by IFREMER in the various stages of installation of a new salmon culture in barge's tanks moored in Morlaix Bay. Tacking into account the opposition to this project, including direct criticism of the role of IFREMER, a considerable effort is made to provide detailed environmental impact data to the appropriate Government office
Tipo: Text
Palavras-chave: Effluents d'aquaculture; Aquaculture en barge; Courantométrie; Conflits; Ostréiculteurs; Pêcheurs; Offshore aquafarming; Aquafarming effluents; Current; Conflicts; Fishermen; Aquaculturists.
Ano: 1990
URL: http://archimer.ifremer.fr/doc/00080/19145/16740.pdf

Impact de la salmoniculture marine sur l'environnement en rade de Cherbourg (1993-1995) 1. Eau et Pélagos
Provedor de dados: 5
Autores: Merceron, Michel; Bentley, Daniel; Le Grand, Jacqueline; Lamort-datin, Laure; Kempf, Marc.
The environmental impact of a brown trout farm located in the Grande Rade de Cherbourg (Normandy) is reported. During observations the fish stock evolved within the range of 140 to 350 metric tons. Farm influence was researched on water column through hydrochemistry, phytoplankton, faecal bacteria and, on bottom, through grain size, organic matter, metals, macrobenthos. This report only deals with water column.  Except ammonia, no hydrological parameter seems to be affected, even near to the net pens. Phytoplankton and coliform bacteria were not altered. An extra concentration of ammonia was detected at some tens meters from the raft, with favourable conditions. But generally it was impossible to observe it unless close to the farming structure, downward...
Tipo: Text
Palavras-chave: Channel; Current; Faecal bacteria; Phytoplankton; Hydrology; Impact; Salmonid; Fish farm; Manche; Courant; Bactéries fécales; Phytoplancton; Hydrologie; Impact; Salmonidé; Aquaculture.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/1997/rapport-3342.pdf