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Registros recuperados: 36
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Analyse des tendances des séries temporelles de la concentration en azote minéral dissous dans les trois principaux estuaires de la façade Manche-Atlantique ArchiMer
Gailhard, Isabelle.
Estuaries are areas which, from their structure, their fonctioning, and their localisation, are subject to significant contribution of nutrients. One of the objectif of the RNO, the French network for coastal water quality monitoring, is to assess the levels and trends of nutrient concentrations in estuaries. A linear model was used in order to describe and to explain the total dissolved nitrogen concentration evolution in the three most important estuaries on the Chanel-Atlantic front (Seine, Loire and Gironde). As a first step, the selection of a reliable data set was performed. Then total dissolved nitrogen evolution schemes in estuary environment were graphically studied, and allowed a resonable choice of covariables. The salinity played a major role...
Tipo: Text Palavras-chave: Nutriments; Estuaire; Loire; Seine; Gironde; Schéma de dilution; Modèle linéaire; Tendance; Nutrients; Estuary; Seine; Loire; Gironde; Dilution schema; Linear mode1; Trend.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00079/19070/16665.pdf
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Bilan des connaissances sur la Rive Droite de la Gironde ArchiMer
Jouanneau, J. M..
Ce mémoire a pour objet de faire très succinctement le point des connaissances acquises à la fin de 1973 sur la rive droite de la Gironde. L'étude traite essentiellement des données de la géologie générale ; de la sédimentologie, de l'hydrologie et de la géochimie. Il y a été ajouté un chapitre sur l'écologie; cette discipline est en effet liée à plus d'un titre aux précédentes. C'est donc un bref résumé des données scientifiques rassemblées sur le milieu naturel.
Tipo: Text Palavras-chave: Géologie; Morphologie; Estuaire; Gironde; Sédimentologie; Hydrologie; Géochimie.
Ano: 1973 URL: http://archimer.ifremer.fr/doc/00080/19155/16755.pdf
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Biologie et pêche traditionnelle des crevettes pénéides dans l'embouchure d'un fleuve en milieur semi-aride (sud-ouest de Madagascar) ArchiMer
Laroche, Jean; Benoely,; Siaviri, A.
Traditional fishing using beach seines was studied over a period of one year at the mouth of the Onilahy river. The catches/efforts were recorded on a daily basis, biological sampling and the measurement of hydrological parameters being carried out twice a month. The moderate variations of salinity and temperature (14 < salinity < 35; 25 degrees C < temperature < 30 degrees C) which were observed in the estuary can be explained by the semiarid climate of the area. Four species of penaeid shrimps are to be found on the Onilahy: Metapenaeus monoceros, Panaeus indicus, Penaeus monodon and Penaeus japonicus, which were mainly caught at the subadult/adult stage with a Carapace length between 10 and 50 mm. The presence of these important sizes at the...
Tipo: Text Palavras-chave: Pêche; Estuaire; Dynamique population; Croissance; Taille corporelle; Cycle évolutif; Zone semi aride; Madagascar; Penaeus japonicus; Penaeus monodon; Penaeus indicus; Metapenaeus monoceros; Rivière Onilahy; Afrique; Milieu saumâtre; Macrura; Decapoda; Crustacea; Arthropoda; Invertebrata; Fishing; Estuaries; Population dynamics; Growth; Body size; Life history; Semi arid zone; Malagasy Republic; Penaeus japonicus; Penaeus monodon; Penaeus indicus; Africa; Brackish water environment; Macrura; Decapoda; Crustacea; Arthropoda; Invertebrata.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/00097/20828/42822.pdf
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Caractérisation de la contamination microbiologique d'origine fécale de l'estuaire de la Seudre en période sèche ArchiMer
Piquet, Jean-come; Fillon, Alain; Thomas, Gerard.
L’estuaire de la Seudre est situé dans le bassin de Marennes-Oléron, au cœur de l’écosystème des Pertuis Charentais. L’estuaire alimente la majorité des surfaces de claire de la région, qui elle même, assure plus de la moitié de la commercialisation nationale. La contamination microbiologique de l’estuaire de la Seudre est donc un enjeu majeur pour l’ostréiculture. L’estuaire possède un bassin versant de faible dimension et dont le fonctionnement hydrologique est particulier. Il est relié à un très important ensemble de zones humides, et les débits d’eau douce sont dépendants de la gestion d’ouvrages hydrauliques. Les périodes d’étiage sont sévères et longues, et les apports d’eau douce à l’estuaire sont quasiment nuls en fin d’été et en début...
Tipo: Text Palavras-chave: Microbiologie; Contamination microbiologique; Bactériologie; Estuaire; Seudre; Charente Maritime.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00129/24048/22011.pdf
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Complexity in trophic structure and stability in a modelled West African estuary ArchiMer
Villanueva, Ching-maria; Diouf, P.s.; Albaret, J.-j.; Moreau, J..
Un modèle Ecopath de l'estuaire du Sine-Saloum (Sénégal) comportant au total 37 groupes fonctionnels a été appliqué dans la présente étude en vue de déterminer les faits essentiels de ce système aquatique. La grande biodiversité spécifique des poissons de l'écosystème peut y jouer un rôle en assurant son intégrité, spécialement en présence de facteurs de stress, bien qu'il ait été observé que ce n'est pas entièrement le cas. Les résultats montrent qu'un autre facteur de mitigation est le niveau des forces d'interaction entre les groupes fonctionnels. La stabilité est accrue par des relations plus faibles et des pyramides plus courtes et plus larges. Bien que différentes questions se posent concernant les facteurs conduisant à la stabilité d'un système, les...
Tipo: Text Palavras-chave: Stabilité des systèmes; Sénégal; Omnivorie; Estuaire; Ecosystème côtier; Ecopath; Biodiversité; Afrique de l'Ouest; West Africa; System Stability; Senegal; Omnivory; Estuary; Ecopath; Coastal Ecosystem; Biodiversity.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-2554.pdf
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Contamination du milieu marin par les micropolluants (résultats du RNO de 1979 à 1994). 3 : L'estuaire de la Gironde ArchiMer
Cantin, Christian.
After a quick presentation of the observation national network of the marine environment quality (RNO), the different metallic and organic Micropollutants measured in the gironde estuary are described (origin, eventual toxicity). The results of the contamination measurements in the living tissue (oysters) are presented on graphics, based on a sample every three months from 1979 to 1994, and means are compared to those obtained during the same period on the others points of the Manche-Atlantique coast.  
Tipo: Text Palavras-chave: Micropolluants; Estuaire; Gironde; Huîtres; Micropollutants; Estuary; Gironde; Oyters.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00422/53310/54148.pdf
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Cycle du mercure en estuaire, baie de Seine et pays de Caux ArchiMer
Laurier, Fabien.
The Seine estuary and its adjacent region Pays de Caux are two significant sources of mercury for coastal marine environments. It is carried through fluvial means for the Seine bay and through karstic fresh water emergences for Pays de Caux's coastal area. Mercury cycle in the Seine estuary and bay is affected by additional anthropical activities. The estuary's maximal turbidity area acts like a trap and a chemical reactor for fluvial mercury. Within this area, we can confirm: (i) the non conservative behaviour of dissolved mercury; (ii) mercury enrichment of particles when comparing the Seine's and marine environment and we suggest mercury particle redistribution from the organic fraction to the oxyhydroxydes fraction. A large fraction of mercury is...
Tipo: Text Palavras-chave: Bay of Seine; Pays de Caux; Estuary; Coastal zone; Speciation; Bioavailability; Mercury; Pays de Caux; Seine; Estuaire; Emergence; Zone côtière; Spéciation; Biodisponibilité; Mercure.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/these-1842.pdf
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Dynamique sédimentaire et évolution holocène d'un système macrotidal semi-fermé : l'exemple de la rade de Brest ArchiMer
Gregoire, Gwendoline.
The bay of Brest is a tide-dominated, semi-enclosed coastal basin, which is connected with two rivers (Aulne and Elorn). Its jagged shoreline and seabed morphology constitute an ideal setting to understand sedimentary transfer at the land-sea interface. In this aim, this study is divided in two different time scale. The first (a) focuses on the present-day sedimentary bedload dynamic and the second (b) on the reconstruction of the Holocene infilling, during the last marine transgression. (a) A analyse combining a sedimentology approach and numerical has highlighted the major control of the tidal currents. Swells and rivers have a minor impact, because the inherited morphology accentuates and promotes tidal currents. There are responsible of a shelly sandy...
Tipo: Text Palavras-chave: Dynamique sédimentaire; Holocène; Paléo-vallée; Estuaire; Système côtier; Rade de Brest; Carottages; Sismique-réflexion; Imagerie; Bathymétrie; Seismic reflection; Coastal system; Bay of Brest; Coring; Paleo-valley; Estuary; Sedimentary dynamic; Backscatter imagery; Bathymetry.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00498/60920/64282.pdf
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Eléments nutritifs limitant la biomasse phytoplanctonique d'une lagune tropicale de Côte d'Ivoire. Comparaison des méthodes d'estimation ArchiMer
Dufour, P.; Cremoux, Jl.; Slepoukha, M..
"In vitro" enrichment experiments on natural populations have been used to determine the nutrients controlling the potential biomass of phytoplancton in the Ebrié coastal lagoon. The limiting nutrients were generally nitrogen, phosphorus and carbon, in this order ; in three cases out of eleven, P and N act simultaneously ; in an extreme eutrophication case, N, P and C were all limiting. No effect was observed following addition of metals, vitamins or chelators. The limitations deduced from the enrichment experiments show a. good agreement with the elementary composition of the external medium ; in waters potentially limited by N alone, the dissolved inorganic nutrients have a N : P ratio lower than 25. The agreement is poorer when the sestonic N : P ratio...
Tipo: Text Palavras-chave: Lagune; Estuaire; Zone tropicale; Phytoplancton; Biomasse; Eléments limitants; Tests biologiques; Composition chimique; Coastal lagoon; Estuary tropical zone; Phytoplankton; Biomass; Limiting nutrients; Bioassay; Chemlcal composition.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00306/41689/40898.pdf
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Etat de la pollution par les hydrocarbures dans l'Aber Benoit ArchiMer
Allen, G.; D'Ozouville, Laurent; L'Yavanc, Jacky.
The Aber Benoît, a small estuary on the North West coast of Brittany was polluted by oil from the Amoco Cadiz oil spill. Preliminary results from water and sediment samples taken in the estuary in May 1978, show that two months after the initial spill, high concentrations of hydrocarbures existed in the water and sediments of the estuary. The Aber Benoît shows a well developed salt wedge and upstream increasing suspended sediment concentrations. Oil was dispersed more or less evenly throughout the water column, in the entire length of the estuary. In the bottom sediments, oil had accumulated to depths of 30 cm. Sand bars appear to induce a trapping of oil in the estuary channel.
Tipo: Text Palavras-chave: Estuaire; Sédiment; Pollution Hydrocarbures; Estuary; Sediment; Oil spill.
Ano: 1978 URL: http://archimer.ifremer.fr/doc/00306/41721/40932.pdf
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Etude des apports en herbicides et en nutriments par la Charente : Modélisation de la dispersion de l'atrazine dans le bassin de Marennes-Oléron ArchiMer
Munaron, Dominique.
Our study aims at making progress the estimate of herbicide and nutrient inputs to the Marennes-Oleron bay which could influence summer oysters mortalities, and to bring by modeling a better understanding of the dynamics of these compounds in the shellfish-farming area. The development of a strategy adapted to the Charente river and its estuary reveals that agricultural activity on the catchment area is omnipresent, as well on the level of the nitrogen and herbicides contributions. It is thus necessary to specify Charente fluxes, which is the main tributary of the Marennes-Oleron bay, in order to better characterize its impact on shellfishfarming activity. Use of a dispersion model will constitute an invaluable help in the risk assessment with respect to...
Tipo: Text Palavras-chave: Atlantic coast; Marennes Oléron Bay; Modelisation; Estuary; Geochemistry behaviour; Charente River; Flux; Nutrient; Herbicide; Littoral Atlantique; Bassin de Marennes Oléron; Modélisation; Estuaire; Comportement Géochimique; Charente; Flux; Nutriments; Herbicides.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/these-2266.pdf
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Etude des nourriceries de la Baie de Seine orientale et de l'estuaire de la Seine ArchiMer
Morin, Jocelyne; Riou, Philippe; Bessineton, Christophe; Vedieu, Christophe; Lemoine, Michel; Simon, Serge; Le Pape, Olivier.
This study, carried out from 1995 to 1997, within the framework of "Le Havre" harbour extension project, concerned halieutic populations and the characterization of a coastal nursery in the oriental part of the Seine bay and the Seine estuary . The main objective was to describe the specific and demographic composition of marine populations and their spatio-temporal distribution, and so assess the biological and halieutic role of this area. This study also included a research about the dietary needs of fish juveniles living in the estuary. Autumn and winter surveys results show that the estuary and area under direct influence are the richest from a biological and halieutic point of view. The mouth estuary isthe richest area in terms of diversity of...
Tipo: Text Palavras-chave: Bay of Seine; Estuary; Food; Trophic; Juvenile; Nursery; Baie de Seine; Estuaire; Alimentation; Trophique; Juvénile; Nourricerie.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/rapport-1507.pdf
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Étude par télédétection de la dispersion en mer des eaux estuariennes issues de la Gironde et du Pertuis de Maumusson ArchiMer
Castaing, P; Allen, Gp; Houdart, Michel; Moign, Y.
The objective of this study, carried out in the Gironde estuary inlet, was to determine the nature of the seaward dispersion of estuarine water and suspended sediments during a spring tide and high river flow. On June 3, 19(7, three flights were made over the inlet, at mid ebb, low tide and mid flood. The planned flight at high tide was cancelled due to adverse meteorological conditions. During each flight, thermal infrared coverage was obtained, together with black and white photographs. These data were correlated with concomitant ground mesures of current velocity, salinity, temperature and suspended sediment concentration Four types of water masses were identified during the tidal cycle: estuarine "very warm and turbid" water; estuarine "cooler and...
Tipo: Text Palavras-chave: Hydrodynamique; Suspensions; Télédétection; Eaux côtières; Estuaire; Gironde; Hydrodynamic; Suspended sediments; Remote sensing; Coastal waters; Estuary; Gironde.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00122/23361/21188.pdf
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Evolution de la température et de la salinité dans l'estuaire de la Charente de juin à novembre 1999 ArchiMer
Robert, Stephane; Razet, Daniel; Goulletquer, Philippe; Soletchnik, Patrick; Geairon, Philippe; Le Moine, Olivier; Faury, Nicole; Mineur, Frederic; Seugnet, Jean-luc.
L'aménagement du fleuve Charente constitue un enjeu particulièrement important tant au niveau des activités de la bande côtière que pour le bassin versant. Au niveau du littoral charentais, et en particulier pour la conchyliculture, le fleuve Charente représente le principal apport d'eaux douces, et donc d 'éléments nutritifs, essentiels au développement de la production primaire et des larves d'huîtres. Ainsi, les apports d'eau douce sont importants pour le développement du phytoplancton (printemps, été, automne), le développement des larves d'huîtres en période estivale qui requiert une dessalure, et la qualité des huîtres en fin d'année. Les suivis des caractéristiques de la Charente sont par conséquent particulièrement importants et ont déjà fait...
Tipo: Text Palavras-chave: Salinité; Température; Evolution temporelle; Estuaire; Paramètres hydrologiques; Charente; Bassin de Marennes Oléron.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00072/18363/15935.pdf
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Géochimie du mercure dans le continuum de la retenue de Petit-Saut et de l'estuaire du Sinnamary, Guyane française ArchiMer
Muresan Paslaru, Bogdan.
The mercury cycle was explored in the Petit-Saut reservoir / Sinnamary Estuary continuum in French Guiana. Main processes involve (i) photo-induced reduction, (ii) adsorption and desorption at the particle surfaces, (iii) methylating bacterial activity, (iv) precipitation and dissolution of iron oxyhydroxides and sulfides. Sources of mercury to the Petit-Saut reservoir consist of the partly impacted river-tributaries, the atmospheric deposition and the flooded soils or vegetation. Once into the reservoir, divalent mercury undergoes a large spectrum of transformations including speciation and phase changes. We, here, probe these processes and demonstrate that the Petit-Saut reservoir behaves as a privileged site for atmospheric recycling and in situ...
Tipo: Text Palavras-chave: Atmosphere; Estuary; Reservoir; French Guiana; Methylmercury; Mercury; Atmosphère; Estuaire; Retenue; Guyane française; Methylmercure; Mercure.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/these-1508.pdf
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Impact du barrage d'Arzal sur la qualité des eaux de l'estuaire et de la baie de la Vilaine ArchiMer
Merceron, Michel.
The Arzal dam upon the Vilaine estuary provokes an aggravation of a recurrent summer hypoxia of the bottom waters in the bay of Vilaine.
Tipo: Text Palavras-chave: Suspended sediments; Salinity; Coastal zone; Dam estuary; Oxygen depletion; Matières en suspension; Salinité; Zone côtière; Estuaire; Barrage; Anoxie.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/rapport-2658.pdf
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Impact du régime du barrage d'Arzal sur la stratification a l'embouchure de la Vilaine : étude par modélisation numérique ArchiMer
Le Hir, Pierre; Duchene, C.; Merel, A; De Nadaillac, G.; Merceron, Michel; Breton, Marguerite.
The rate of flow of the fresh water releases at the Arzal Dam into the Vilaine is likely to influence the haline structure of Vilaine Bay. In order to determine the rate of flow that causes a minimum downstream stratification, a vertical two-dimensional mathematical modelling of the Vilaine's estuary was undertaken. We obtain very similar stratification flows for different fresh water release scenarios, in spite of the rather different desalinisations and currents.
Tipo: Text Palavras-chave: Water release; Stratification; Estuary; Numerical model; Vilaine; Rejet de barrage; Stratification; Estuaire; Modèle numérique; Vilaine.
Ano: 1986 URL: https://archimer.ifremer.fr/doc/1986/rapport-2654.pdf
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Incidence du débit de la Charente sur la capacité biotique du bassin ostréicole de Marennes-Oléron ArchiMer
Ravail, Brigitte; Heral, Maurice; Maestrini, Serge; Robert, Jean-michel.
The estuary of Charente can be considred as a vast natural zone of mixing brackish waters and marine waters of Marennes-Oleron. One part of the cruises engaged from October 1985 to November 1987, allowed to dfine the main hydrobiological features of the estuary and to estime the input of the river Charente. Cruises permitted to establish the general hydrobiological schema of the estuarine bay and showed that the river Charente does play a part in the salinity and nitrogen inputs on marine waters.
Tipo: Text Palavras-chave: Estuaire; Charente; Marennes-Oléron; Panache de dispersion; Eaux douce; Impact.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00015/12663/9552.pdf
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Influence de l'apport de la Charente sur la qualité bactériologique des eaux de l'estuaire - Campagnes 1988 et 1989 ArchiMer
Masson, Daniel; Faury, Nicole; Ratiskol, Jacqueline.
Le bassin de Marennes Oléron, comme toutes les zones conchylicoles, est susceptible d'être touché par les apports pollués. Dans ce domaine, le vecteur potentiel que constitue la Charente méritait d'être étudié plus particulièrement, la qualité bactériologique des eaux pouvant affecter par la suite la salubrité des coquillages. L'étude précédente (Masson et al. 1988) a fait apparaître que la pollution bactérienne apportée par la Charente (particulièrement en étiage) sédimentait rapidement, la quantité de germes devenant très faible à la sortie de l'estuaire. Toutefois, comme l'enjeu économique est important (perspectives européennes) il était nécessaire de confirmer ce résultat avec un système de suivi identique à celui utilisé en 1987. De plus, un certain...
Tipo: Text Palavras-chave: Bactériologie; Qualité eaux; Salubrité coquillages; Pollution bactérienne; Estuaire; Charente; Charente Maritime Dep..
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00087/19827/17469.pdf
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La Charente, un estuaire conchylicole ArchiMer
Thomas, Gerard; Kantin, Roger; Heral, Maurice.
A coastal river 380 km long, the Charente river has a catchment area of about 10,000 km2, flowing through the departments of Charente and Charente-Maritime, as well as a small part of the border departments: Dordogne, Deux-Sèvres, Haute-Vienne and Vienne. Its main affluents are the Tardoire, the Seugne and the Boutonne rivers. The highest part of the catchment area is located in Dordogne, at a height of 496 m, whereas the river itself originates from a spring located at a height of 250 m to the south-east of Rochechouart, in the Haute-Vienne. The average height of the catchment area is quite low. In its downstream part, from the Saint-Savinien dam to the ocean, the Charente is influenced by a dynamic tide. The actual estuarine part begins in...
Tipo: Text Palavras-chave: Charente Maritime; Gestion eau; Qualité eaux; Conchyliculture; Capacité trophique; La Charente; Estuaire.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/publication-6289.PDF
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