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| Registros recuperados: 36 | |
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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| Registros recuperados: 36 | |
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