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Registros recuperados: 8
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Dynamique des sédiments fins et mixtes des zones intertidales de la baie de Marennes-Oléron ArchiMer
Kervella, Stephane.
This thesis aims at increasing the general knowledge on sediment dynamics of intertidal flats in the Marennes-Oléron Bay, according to physical, biological and anthropogenic factors. The conducted research is compound of three complementary studies: (1) a study of sediment behaviour through applied rheophysics on intertidal superficial sediments; (2) a hydro-sedimentary study based on identification of the forcing action (physical, biological or anthropogenic) on the intertidal flat stability over several time scales (from the event to several months); (3) a specific application of the model SiAM-2DH to the Marennes-Oléron Bay. The surface sediments shows a mechanical behaviour that mainly depends on the fine fraction for a composition that contains up...
Tipo: Text Palavras-chave: Rhéophysique; Seuil d’écoulement; Sédiments cohésifs et mixtes; Sédimentation; Érosion; Hydrodynamique; Vasière; Zone intertidale; Conchyliculture; ALTUS; SiAM-2DH; Baie de Marennes-Oléron; Rhéophysics; Shear strenght; Cohesive and mixed sediment; Sédimentation; Erosion; Hydrodynamics; Mudflat; Intertidal area; Oyster; ALTUS; SiAM-2DH; Marennes-Oléron Bay..
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00004/11534/8117.pdf
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Evolutions quantitatives et qualitatives du seston dans une claire à huîtres : relation avec la sédimentation et la biodéposition ArchiMer
Sornin, Jean-marc; Delmas, Daniel; Deslous-paoli, Jean-marc.
Dans un bassin aquacole fermé (claires à huîtres), l'évolution qualitative et quantitative des matières en suspension subit des variations saisonnières directement liées aux capacité de production planctonique. Ainsi, à la fin du printemps et en été, le réchauffement des eaux s'accompagne d'une augmentation de matière organique importante (jusqu'à 17 mg.1(-1). Pendant cette période, la sédimentation naturelle est supérieure à 350 g.m(-2).j(-1). La biodéposition (fèces + pseudofèces) suit l'évolution des capacités de rétention des huîtres. Dans ce type de bassin fermé, cette capacité est liée à la qualité des matières en suspension. En période estivale, les fortes teneurs en matière organique du seston (entre 5 et 17 mg.1(-1)) dispensent les mollusques...
Tipo: Text Palavras-chave: Crassostrea gigas; Oysters; Biodeposition; Sedimentation; Suspension; Particulate organic matter; Crassostrea gigas; Huîtres; Biodéposition; Sédimentation; Suspension; Matière organique particulaire.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/publication-7309.pdf
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Fonctionnement des marais maritimes atlantiques: échanges d'énergie et effets des flux aquacoles diffus ArchiMer
Bel Hassen, Malika.
French estuaries, from the Atlantic coast to the English channel, have been characterized by a poor phytoplankton biomass. The turbidity has always been considered as the limiting factor for phytoplankton. Estuarine ecosystems are situated at the boundary between the land and the sea. Consequently, they are subject to an enrichment by nutrient loadings from upland ecosystems. Although it has been demonstrated that a part of the nutrient loadings support an important benthic production. The part, which escapes to the estuarine benthic and planktonic food web and is exported to adjacent estuarine ecosystems, still remains undetermined. Quantifying the nu trient and particulate matter exchange between a macrotidal Bay, the Fier d'Ars, and the adjacent ocean...
Tipo: Text Palavras-chave: Aquaculture; Exportation; Matière dissoute; Fiers d'Ars; Systèmes d'Information Géographique; Importation; Usages; Lumière; Micorphytobenthos; Modélisation; Nutriments; Matière organique; Matière particulaire; Phytoplancton; Sédimentation; Aquaculture; Export; Dissolved matter; Fier d'Ars Bay; Geographic Information Systems; Import; Land use; Light; Microphytobenthos; Modelling; Nutrients; Organic matter; Particulate matter; Phytoplankton; Sedimentation.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00450/56185/57738.pdf
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Implantation sur le modèle courantologique Oko des lois de remise en suspension ArchiMer
Raillard, Olivier.
Cette étude a pour but d'introduire dans le modèle de production globale du bassin de Marennes-Oléron une nouvelle source de variabilité des teneurs de la colonne d'eau en éléments particulaires par la prise en compte des échanges verticaux à l'interface eau-sédiment. Dans la précédente formulation du modèle les biodépots, alors la seule source d'alimentation du fond, sont instantanément remis en suspension. Toutefois la faible bathymétrie ainsi que des régimes de courants et de vents variables déterminent des variations importantes dans les concentrations du matériel particulaire (Bacher, 1989) susceptibles d'influer sur la production biologique primaire et secondaire (fig. 1). Ces échanges conditionnent en partie les fluctuations de quantité de lumière...
Tipo: Text Palavras-chave: Courantologie; Modélisation; Erosion; Sédimentation; Marennes Oléron; Département Charente-Maritime.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00146/25741/23844.pdf
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Le comblement de la ria de Gernika (golfe de Gascogne) à l'Holocène terminal ArchiMer
Pascual, A; Weber, O; Rodriguez-lazaro, J; Jouanneau, Jm; Pujos, M.
A study of the recent sedimentation of the ria de Gernika (Bay of Biscay) is undertaken to characterise different steps of its Holocene filling. Sedimentological and micropalaeontological analysis of six cores sampled in the ria, completed with absolute dating (C-14, and based upon Pb-210 exc.), allow us to identify three phases in the filling of the ria that are Limited by two transgressive shifts (3500 and 2500 yr. B.P.) already described in other areas of the Bay of Biscay. In the first phase, lithologies as well as benthic foraminifera and ostracode assemblages are typical of coastal marine palaeo-environment. During the second phase the euryhaline waters progessively occupy the central area of the estuary. Here the presence of allochthonous...
Tipo: Text Palavras-chave: Microfaune; Sédimentation; Holocène terminal; Ria de Gernika; Microfauna; Sedimentation; Late Holocene; Ria de Gernika.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00326/43684/43237.pdf
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Matière en suspension et sédimentation dans la lagune de Thau ArchiMer
Pichot, Paul; Deslous-paoli, Jean-marc; Juge, Claude.
Thau is a mediterranean lagoon with a large productive stock of molluscs (oysters, mussels) cultivated on suspended tines and colonised by epibionta (ascidia and others invertebrates, algae, etc ... ). This study was developed as part of the PNOC-OXYTHAU.programme. Its aim was to analyze the effects of oyster farrning on water-mass surrounding structures loaded with suspended molluscs and proximal watermass separating these structures. This study concems particulate suspended matter and deposits of particulate organic matter on the bottom after sedimnentation. Biochemical measurements were carried out for nitrogen, carbon,  proteins, lipids and carbohydrates. ln order to estimate sedimentaton, bottom sediment traps were used
Tipo: Text Palavras-chave: Méditérranée; Etang de Thau; Matière en suspension; Azote; Carbone; Protites; Lipides; Glucides; Sédimentation; Mediterranean; Lagoon of Thau; Particulate suspended mattter; Nitrogen; Carbon; Proteins; Lipids; Carbohydraes; Sedimentation.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00425/53662/54501.pdf
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Open-air treatment of wastewater from land-based marine fish farms in extensive and intensive systems: current technology and future perspectives ArchiMer
Hussenot, Jerome; Lefebvre, Sébastien; Brossard, Nicolas.
Marine land-based fish farms located in coastal wetlands (salt-pond zones, lagoon banks, etc.), whether extensive or intensive, send farm effluents directly to the sea or after short periods of stocking in retention reservoirs. The aims of our investigation have been to compare the efficiency of current and potential water treatment procedures in open-air. Wastewater retention ponds in commercial farms (Atlantic coasts of France) are efficient in removing up to 1 metric ton of particulate material (dry weight) per hectare and per day (faeces and unconsumed feed), but are inefficient in reducing dissolved wastes, both organic (urea, amino acids, protein) and inorganic (total ammonia nitrogen, phosphates). Forthcoming outdoor technology to treat these forms...
Tipo: Text Palavras-chave: Traitement de l'eau; Effluent; Décantation; Sédimentation; Écumage; Microalgue; Huître; Water treatment; Effluent; Aquaculture; Sedimentation; Foam fractionation; Microalgae; Oyster.
Ano: 1998 URL: https://archimer.ifremer.fr/doc/1998/publication-873.pdf
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Suivi de l'évolution verticale d'un banc sableux à vocation ostréicole - Cas du banc de Lamouroux ArchiMer
Kervella, Stephane; Geairon, Philippe; Le Moine, Olivier; Robert, Serge.
Tipo: Text Palavras-chave: Sédimentation; Ostréiculture; Marennes Oléron.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00175/28594/27001.pdf
Registros recuperados: 8
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