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Registros recuperados: 40
Primeira ... 12 ... Última
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Approche bidimensionnelle des transports sédimentaires à partir des variations granulométriques des sédiments superficiels : Exemple de la partie occidentale de la baie du Mont Saint-Michel ArchiMer
Ehrhold, Axel; Auffret, Jean-paul.
Grain size trends in relation to net sediment transport pathways are examined, using sorne cornmonly-used grain size pararneters. The results of the model are compared with the net sediment transport pathways established on the basis of the bedfonn asymmetry. The 3 types of trends are calculated using an increasing characteristic distance and differents grids of seabed sediment samples. lt is shown that : (1) the characteristic distance defined by Gao et Collins (maximum spatial sampling interval) changes with these two factors to a maximal value; (2) in an heterogeneous sedimentary environment, the correlations between calculated vectors and observed transport pathways are better by using sand size distributions and (3) the residual pattern rises to sixty...
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Ano: 1996 URL: http://archimer.ifremer.fr/doc/00285/39620/38111.pdf
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Approche multi-échelles de la cartographie des habitats benthiques des substrats meubles subtidaux : application à la frange côtière de Bretagne nord ArchiMer
Chevalier, Claire; Dutertre, Mickael; Hamon, Dominique; Ehrhold, Axel; Gentil, Franck; Thiebaut, Eric; Bajjouk, Touria.
Tipo: Text
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00281/39231/37791.pdf
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Approche sectorielle subtidale : Identification et caractérisation des habitats benthiques du secteur Glénan (Réseau de surveillance benthique - Région Bretagne) ArchiMer
Ehrhold, Axel; Blanchet, Aline; Hamon, Dominique.
Ifremer launched and coordinated the development of a strategy for the REBENT network (REseau BENThique) in 2000 to monitor the aftermath of the "Erika" oil spill in December 1999. Its aim is to provide consistent baseline knowledge about coastal benthic habitats and constitute a monitoring tool to detect changes at various scales over time and space. Sector-based seabed habitat mapping in shallow water (< 50 m deep), is currently being conducted throughout Brittany's coastal waters through a combination of geoacoustic marine systems and ground-truthing using biological grab sampling and seabed observations. Sedimentological and biological results on Glenan area emphasize a great diversity of subtidal habitats and marine species recognized. Sidescan...
Tipo: Text Palavras-chave: Haploops; Maerl; Bedforms; Bedload transport; Communities; Benthic macrofauna; Sidescan sonar; Habitats mapping; Glenan; Rebent; Haploops; Maërl; Figures sédimentaires; Dynamique sédimentaire; Peuplements; Macrofaune benthique; Sonar latéral; Cartographie d'habitats; Glénan; Rebent.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/rapport-2301.pdf
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Cartes sédimentologiques et morpho-bathymétriques de la baie de Morlaix et de sa région ArchiMer
Ehrhold, Axel.
La baie de Morlaix, fermée par l’île de Batz à l’ouest, les falaises de Primel-Trégastel à l’est, et l’archipel de la Méloine au nord, est un des joyaux de la côte bretonne appréciée pour sa diversité biologique mais beaucoup moins connue par ses particularités géologiques. Sa morphologie sous-marine est une sorte de labyrinthe, composé de nombreux îlots et hauts-fonds, à l’origine d’une mosaïque de provinces sédimentaires où se confrontent à chaque marée, courants et sédiments. Cette synthèse (au format papier et numérique) regroupe les travaux menés depuis une dizaine d’années par l’Ifremer sur les fonds de cette région. Elle répond ainsi à la préoccupation d’une large communauté curieuse de son environnement : la morphologie du littoral, la dynamique et...
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00285/39603/38097.pdf
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Cartographie bio-sédimentaire des fonds subtidaux de l’archipel de Chausey. Programme HEIMa. Rapport final ArchiMer
Fournier, Jérome; Desroy, Nicolas; Ehrhold, Axel; Autret, Elodie; Cordier, Celine; Janson, Anne-laure.
Tipo: Text
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00280/39163/37752.pdf
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Cartographie prédictive du champ de Laminaires du plateau Molénais sur la base des données physiques et biologiques. Recueil des données acoustiques, biologiques et sédimentaires nouvellement acquises depuis septembre 2010 ArchiMer
Ehrhold, Axel; Bajjouk, Touria; Populus, Jacques; Cordier, Celine; Gorman, Daniel; Gaffet, Jean-dominique; Caisey, Xavier.
Tipo: Text
Ano: 2011 URL: https://archimer.ifremer.fr/doc/00281/39176/37737.pdf
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Cartographie prédictive du champ de laminaires du plateau Molène sur la base des données physiques et biologiques ArchiMer
Bajjouk, Touria; Rochette, Sebastien; Ehrhold, Axel; Cordier, Celine; Laurans, Martial; Tourolle, Julie; Hamdi, Anouar; Tourolle, Julie; Gaffet, Jean-dominique; Caisey, Xavier; Vasquez, Mickael; Populus, Jacques.
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00280/39159/37722.pdf
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Control factors of Holocene sedimentary infilling in a semi-closed tidal estuarine-like system: the bay of Brest (France) ArchiMer
Gregoire, Gwendoline; Le Roy, Pascal; Ehrhold, Axel; Jouet, Gwenael; Garlan, Thierry.
This study details the sedimentary infilling of an original tidal-dominated estuary system during the final stage of the last marine transgression. The Bay of Brest is confined and connects the rivers Elorn and Aulne, to the sea of Iroise by a narrow strait encasing a well preserved paleo-channel. The compilation of high- and very-high-resolution bathymetric and seismic data, constrained by sediments datations, allows us to classify the paleo-morphology of the bay into three stepped domains: the paleo-valley floor surrounded by fluvial terraces, the central plateau, and the shallow embayments. Taking into account the main factors controlling the infilling, including sea-level rise, substratum morphology, and hydrodynamics, the stratigraphic scheme of the...
Tipo: Text Palavras-chave: Tide-dominated estuary; Incised-valley; Holocene infill; Seismic stratigraphy; Estuarine processes; Bay of Brest.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00358/46968/46883.pdf
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Directive Cadre sur l'Eau - Région Bretagne : Reconnaissance cartographique de bancs de maërl distribués dans les masses d'eaux côtières de référence. Convention Ifremer-Agence de l'Eau Loire-Bretagne. Volume 1, Rapport de synthèse, Volume 2, Résultats analytiques ArchiMer
Hamon, Dominique; Ehrhold, Axel; Houlgatte, Eric.
Tipo: Text
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00025/13664/10854.pdf
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Du sonar au microscope : les fonds marins auscultés aux abords du cap de Flamanville ArchiMer
Hamon, Dominique; Ehrhold, Axel; Chevalier, Claire; Caisey, Xavier; Gaffet, Jean-dominique; Alix, Anne-sophie.
Tipo: Text
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00064/17507/15021.pdf
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Dynamique de comblement d'un bassin sédimentaire soumis à un régime mégatidal : Exemple de la Baie du Mont-Saint-Michel ArchiMer
Ehrhold, Axel.
This work has been performed in a DRET/CNRS convention and related to the problems of sedimentary dynamics in a bay dominated by tidal currents. It combines the descriptive study of the morphosedimentary units with the modeling of bedload processes. At the South channel Isles, the Mont-Saint-Michel bay is well known for his exceptional tidal range. It's open to the offshore with two broad master channels on both sides from the Chausey's archipelago. On the coarse sedimentary cover of pebbles and gravels, sediments dynamic series of some plurikilometres sandy ribbons. These sands are temporarily stocked in lonely bedforms and in coastal maritime banks, sandwaves field of Granville and tide delta. The coastal banks are connected in the littoral prism. They...
Tipo: Text Palavras-chave: Bedload transport; Hydrodynamic numerical model; Sediment color; Crepidule; Coastal banks; Sandwaves; Sand ribbons; Swells; Tidal currents; Sedimentary prism; Norman breton Gulf; Transport solide; Code numérique; Couleur des sédiments; Crépidule; Bancs côtiers; Dunes tidales; Rubans sableux; Houle; Courants de marée; Prisme sédimentaire; Golfe normand breton.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/these-3232.pdf
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Environmental factors affecting maerl bed structure in Brittany (France) ArchiMer
Dutertre, Mickael; Grall, Jacques; Ehrhold, Axel; Hamon, Dominique.
This study used a large spatial scale approach in order to better quantify the relationships between maerl bed structure and a selection of potentially forcing physical factors. Data on maerl bed structure and morpho-sedimentary characteristics were obtained from recent oceanographic surveys using underwater video recording and grab sampling. Considering the difficulties in carrying out real-time monitoring of highly variable hydrodynamic and physicochemical factors, these were generated by three-dimensional numerical models with high spatial and temporal resolution. The BIOENV procedure indicated that variation in the percentage cover of thalli can best be explained (correlation = 0.76) by a combination of annual mean salinity, annual mean nitrate...
Tipo: Text Palavras-chave: Benthic habitats; Brittany; Environmental factors; Estuary; Large spatial scale; Maerl.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00280/39089/37816.pdf
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Etude d’un champ de pockmarks associé à un peuplement de Haploops dans la Baie de Concarneau : apport de la prospection géophysique THR ArchiMer
Baltzer, Agnes; Ehrhold, Axel; Rigolet, Carinne; Dubois, Stanislas; Cordier, Celine.
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00281/39232/37792.pdf
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Etude morpho-sédimentaire du plateau rocheux de la Méloine (Finistère nord). Méthodologie appliquée aux traitements des données et résultats sur la distribution des roches dans l’archipel ArchiMer
Ehrhold, Axel; Gautier, Emeric; Roubi, Angelique; Guerin, Charline; Gaillot, Arnaud; Gaffet, Jean-dominique; Caisey, Xavier.
Etude morpho-sédimentaire du plateau rocheux de la Méloine (Finistère nord) Méthodologie appliquée aux traitements des données et résultats sur la distribution des roches dans l’archipel.
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00280/39111/37664.pdf
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Etude morpho-sédimentaire du plateau rocheux de la Méloine (Finistère nord). Recueil des données acoustiques, sédimentaires et d’observations acquises pendant les missions GEOMELOINE et NEOMELEC’H en 2014 ArchiMer
Ehrhold, Axel; Gautier, Emeric; Roubi, Angelique; Guerin, Charline; Gaillot, Arnaud; Gaffet, Jean-dominique; Caisey, Xavier.
Etude morpho-sédimentaire du plateau rocheux de la Méloine (Finistère nord). Recueil des données acoustiques, sédimentaires et d’observations acquises pendant les missions GEOMELOINE et NEOMELEC’H en 2014
Tipo: Text
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00280/39109/37662.pdf
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Forêts de laminaires à Molène : approches multi-échelles des fonds rocheux de l’archipel ArchiMer
Ehrhold, Axel; Bajjouk, Touria; Cordier, Celine; Le Nilliot, Philippe; Hamdi, Anouar; Drussel, Benjamin; Guerin, Charline; Le Gall, Bernard; Populus, Jacques.
Tipo: Text Palavras-chave: Habitat; Laminaires; Systèmes acoustiques; Lidar; Géomorphologie; MNT.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00281/39230/37790.pdf
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Haliotis, nouvel outil pour l’étude des habitats benthiques dans les très petits fonds ArchiMer
Ehrhold, Axel; Cordier, Celine; Pluquet, Fabrice; Alix, Anne-sophie; Monpert, Coralie; Autret, Elodie; Hamon, Dominique.
Les besoins d'inventaires et de suivis des habitats benthiques côtiers, de même que la nécessité de mieux comprendre leur fonctionnement, conduisent depuis plusieurs années à mettre en place des actions à différentes échelles d'observation spatiales et temporelles sur l’ensemble des façades métropolitaines. L’application du Réseau Benthique au pilote breton en est une parfaite illustration. Le Rebent a ainsi soutenu dès 2001 le projet d’une embarcation spécialisée, destinée à relayer dans la frange littorale les moyens acoustiques mis en oeuvre sur les navires côtiers plus au large, et capable d’assurer une investigation des fonds sur de grandes superficies, avec un fort pouvoir de résolution. Ce projet de vedette porté par l’Ifremer a été rendu possible...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00283/39440/37888.pdf
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Human-induced river runoff overlapping natural climate variability over the last 150 years: Palynological evidence (Bay of Brest, NW France) ArchiMer
Lambert, Clement; Penaud, Aurelie; Vidal, Muriel; Klouch, Khadidja; Gregoire, Gwendoline; Ehrhold, Axel; Eynaud, Frederique; Schmidt, Sabine; Ragueneau, Olivier; Siano, Raffaele.
For the first time a very high resolution palynological study (mean resolution of 1 to 5 years) was carried out over the last 150 years in a French estuarine environment (Bay of Brest; NW France), allowing direct comparison between the evolution of landscapes, surface water, and human practices on Bay of Brest watersheds, through continental (especially pollen grains) and marine (phytoplanktonic microalgae: cysts of dinoflagellates or dinocysts) microfossils. Thanks to the small size of the watersheds and the close proximity of the depositional environment to the mainland, the Bay of Brest represents an ideal case study for palynological investigations. Palynological data were then compared to published palaeo-genetic analyses conducted on the same core...
Tipo: Text Palavras-chave: Pollen grains; Dinoflagellate cysts; Estuarine dynamics; River runoff; Climate variability.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00410/52110/52813.pdf
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Imagerie LiDAR du socle hercynien immergé de l’archipel de Molène, Ouest Massif Armoricain. Evidence d’un duplex ductile décrochant et d’intrusions syntectoniques ArchiMer
Le Gall, Bernard; Authemayou, Christine; Ehrhold, Axel.
Tipo: Text
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00363/47439/47464.pdf
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Influence des facteurs hydrodynamiques sur la répartition et l'évolution morpho-sédimentaire : exemple de la Rade de Brest (Finistère) ArchiMer
Gregoire, Gwendoline; Ehrhold, Axel; Jouet, Gwenael; Augris, Claude; Simplet, Laure; Le Roy, Pascal; Garlan, Thierry.
Tipo: Text
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00285/39614/38108.pdf
Registros recuperados: 40
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