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| Registros recuperados: 94 | |
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| Soletchnik, Patrick; Le Moine, Olivier; Razet, Daniel; Geairon, Philippe; Faury, Nicole; Goulletquer, Philippe; Robert, Stephane. |
| The Marennes-Oléron Bay is the first cupped oyster production site (35,000 tons/year). For more than 10 years, this species has suffered chronic mortality episodes. A research program has been developed since 1994 in association with the professional sector, in order to try and explain these mortalities. |
| Tipo: Text |
Palavras-chave: Production; Croissance; Modélisation; GIS; Système d'Informations Géographique; Crassostrea gigas; Huîtres; Mortalités estivales. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/1999/acte-3377.pdf |
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| Dange, Catherine. |
| Most of trace elements have a non conservative behavior in estuarine environments. It is the case of cadmium, cobalt and caesium for which the fate in estuarine and coastal zones is largely controlled by their distribution between water and suspended particles, which generally have high residence times or can be definitely deposited in these areas. Metallic contaminants and radionuclides can be present under various species : dissolved (mineral and organic complexes), colloidal and particulate forms (adsorbed, precipitated) or integrated by various mechanisms in the organisms. Such distributions are the result of processes (physical, chemical, biological) which are controlled by many factors (ionic strengh, pH, Eh, major cations concentration, nature and... |
| Tipo: Text |
Palavras-chave: Modeling; French estuaries; Caesium; Cobalt; Cadmium; Radionuclides; Trace metals; Speciation; Modélisation; Estuaires français; Cesium; Cobalt; Cadmium; Radionucléides; Métal trace; Speciation. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/these-183.pdf |
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| Populus, Jacques; Loubersac, Lionel; Prou, Jean; Kerdreux, Michel; Le Moine, Olivier. |
| In Marennes-Oléron, Héral (1986) described the relationship between the annual production and the oysters' biomass over a century. His conclusion is that the drop in the growth of oysters was caused by an "overstorage" considering the trophic capacity of the basin. Moreover, the large intertidal spaces, though providing a great opportunity for mollusc culture, suffer from a large bio-deposition (Sornin 1983) which tends to intensify the sedimentation of the basin. The spatial management of oyster culture could be a key factor for its long-term development. In collaboration with the French Marine Affairs, in charge of the cadastral management, the IFREMER has developed a geographical information system enabling the gathering under the same geographic... |
| Tipo: Text |
Palavras-chave: Bathymétrie; Cartographie; Modélisation; Conchyliculture; SIG; Système d'Informations Géographique. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/1997/acte-3323.pdf |
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| Raillard, Olivier; Menesguen, Alain. |
| Oyster production of the Marennes-Oléron Basin is simulated using a model integrating phytoplankton growth, oyster growth and horizontal transport of suspended matter. Firstly the simulations are compared to the measurements. At season scale, the phytoplankton and nitrates evolution are well predicted by the model. In compensation, the model does not simulated well the spring/neap tidal variability of the phytoplankton. Secondly, the phytoplancton and oyster productions are calculated as a function of the nitrates river inputs. Biotic capacity of the basin appears to be particulary influenced by these nutrients during summer. On the other hand, spatial variability of the impact of the nitrates variation is clearly shown, the primary productions of the... |
| Tipo: Text |
Palavras-chave: Croissance; Production; Marennes Oléron; Crassostrea gigas; Huîtres; Modélisation. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/1991/acte-3042.pdf |
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| Raillard, Olivier. |
| La complication d'un modèle déterministe est une action qui ne peut être envisagée sans raisons impérieuses. En plus des mécanismes nouveaux qu'il importe de connaître précisément pour les formaliser correctement, l'introduction de nouveaux paramètres, dont la valeur exacte n'est jamais connue, accroit l'incertitude du modèle (Klepper et Scholten, 1988) et affecte ainsi sa robustesse (Swartzman et Kaluzny, 1987). A Marennes-Oléron, l'introduction d'un modèle de production primaire doit permettre d'aborder les problèmes suivants : Quelle est véritablement l'impact des débits de la Charente sur la production ostréicole? ou plus précisément : les nutriments d'origine charentaise contrôlent-ils la production phytoplanctonique du bassin et par voie de... |
| Tipo: Text |
Palavras-chave: Modélisation; Croissance; Phytoplancton; Modèle biologique; Bassin de Marennes Oléron; Charente Maritime. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00102/21313/18932.pdf |
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| Heral, Maurice; Bacher, Cedric; Razet, Daniel; Prou, Jean; Deslous-paoli, Jean-marc. |
| Le bassin conchylicole de Marennes-Oléron assure 40 % des 100 000 tonnes d ' huîtres commercialisées annuellement en moyenne en France (20 000 emplois, 1 milliard de chiffre d'affaire) . La modélisation des équilibres qui s'établissent entre l es stocks mis en culture , et la production annuelle , réalisée par la station IFREMER de La Tremblade , a mis en évidence les résultats suivants : Lorsque la biomasse augmente : a) La production plafonne vers 40 000 tonnes pour une biomasse de l'ordre de 80 000 tonnes avec l'huître japonaise, ce qui correspond à une biomasse équivalente de 130 000 tonnes d'huîtres portugaises. b) La durée du cycle de production d'une huître de 70 g passe de 2 ans à 4 ans. c) Les mortalités courantes passent simultanément de 20 % à... |
| Tipo: Text |
Palavras-chave: Production; Ostréiculture; Biomasse; Modélisation; Marennes Oléron. |
| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/00048/15909/13338.pdf |
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| Boutin, Guillaume. |
| Sea ice, which covers most of the ocean near the poles, is a key component of the climate system. Global warming is driving its massive melting, especially in the Arctic. Where sea ice cover decreases, fetch increases leading to more energetic sea states. This means potentially enhanced wavesice interactions effects in the future. The quick evolution of sea ice extent and volume combined with the intensification of human activities in polar regions urge us to improve our understanding of waves-ice interactions.Sea ice attenuates waves. They can however propagate through it and break it far into the ice cover. Attenuation depends on ice properties such as floe size, thickness, etc. Once broken, resulting floes are more likely to drift and melt. In addition,... |
| Tipo: Text |
Palavras-chave: Vagues; Banquise; Modélisation; Zone Marginale de Glace; Waves; Sea ice; Model; Marginal Ice Zone. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00498/60968/64376.pdf |
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| Tissière, Laurie; Mahévas, Stephanie; Michel, Charlotte; Trouillet, Brice. |
| A prospective approach can be used to establish management and environmental protection options to stimulate discussion and bring different scenarios for the future into perspective. This future-oriented process incorporates spatial dimensions with the development of a geoprospective approach. Indeed, a geoprospective approach highlights geographical dynamics and integrates spatial perspectives into the debate. A participatory framework for analyzing the marine fisheries sector has two main advantages. The first is academic, in that it helps to establish a methodological and epistemological corpus based on geoprospective. The method proposal allows, on the one hand, to discuss the purpose of the models and, on the other, to explore the role of researchers... |
| Tipo: Text |
Palavras-chave: Géoprospective; Modélisation; Participation; Méthodes mixtes; Démocratie et gouvernance environnementales; Pêches maritimes; Geoprospective; Modeling; Participation; Mixed methods; Environmental democracy and governance; Marine fisheries. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00664/77597/79611.pdf |
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| Bompais, Xavier. |
| Les suspensions d'élevage de moules sur filières (ou long-lines) sont décrites et modélisées ainsi que les efforts hydrodynamiques qui s'y appliquent. Le rapport présente ensuite une modélisation de leur comportement dans le courant, s'attachant à décrire les déformées statiques, les effets de masque et les phénomènes vibratoires qui peuvent survenir. Deux sites d'implantation sont traités en application, chacun avec différents cas de chargement. Le rapport conclut en conseillant de choisir une orientation des filières d'élevage dans le courant différente de celle retenue pour les deux sites étudiés. |
| Tipo: Text |
Palavras-chave: Long-lines; Mytiliculture; Mer ouverte; Modélisation. |
| Ano: 1990 |
URL: https://archimer.ifremer.fr/doc/00469/58036/60454.pdf |
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| Registros recuperados: 94 | |
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