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	Provedor de dados 5 (8) Autor Ehrhold, Axel (4) Hamon, Dominique (4) Chevalier, Claire (3) Alix, Anne-sophie (2) Blanchet, Aline (2) Caisey, Xavier (2) Dupre, Stephanie (2) Foucher, Jean-paul (2) Gaffet, Jean-dominique (2) Mascle, Jean (2) Pluquet, Fabrice (2) Autret, Elodie (1) Bajjouk, Touria (1) Biscara, Laurie (1) Boetius, Antje (1) Ceramicola, Silvia (1) Choisnet, Justine (1) Drussel, Benjamin (1) Houlgatte, Eric (1) Klaucke, Ingo (1) Mais... Palavra-chave Sidescan sonar (8) Sonar latéral (5) Benthic macrofauna (4) Communities (4) Dynamique sédimentaire (4) Macrofaune benthique (4) Peuplements (4) Rebent (4) Bedforms (3) Bedload transport (3) Cartographie d’habitats (3) Figures sédimentaires (3) Cartographie d'habitats (2) Gas chimneys (2) Habitats mapping (2) Maerl (2) Mapping (2) Maërl (2) Morphologie (2) Morphology (2) Mais... Tipo do documento Text (8) Ano 2013 (1) 2011 (1) 2010 (2) 2009 (1) 2006 (2) 2000 (1) Mais... País France (8) Idioma Francês (5) Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 8 Primeira ... 1 ... Última Approche sectorielle subtidale : Identification et caractérisation des habitats benthiques du secteur Glénan (Réseau de surveillance benthique - Région Bretagne) 5 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 Évolution récente et sédimentation des plates-formes continentales de la Corse 5 Pluquet, Fabrice. This work aimed at displaying and studying morphological and sedimentological features of Corsican seafloor from the coast to depths of -100m. It also aimed at a better knowledge of sediment dynamics under hydrodynamic conditions, and at a reconstitution of the late Quaternary shorelines evolution. Careful analysis of the bathymetry has revealed a very contrasted morphology between the different areas of Corsican shelves, as it has been displayed on an synthetic geomorphological map. In addition, an homogeneous and overall map of surficial sediments of the Corsican shelves seabed was established and two areas, the Balagne and Agriates' platforms to the North of Corsica, and the Bonifacio Straits to the South, were mapped into details. The various... Tipo: Text Palavras-chave: Fossil shoreline; Late Quaternary; Habitats mapping; Sidescan sonar; Hydrodynamism; Sédimentology; Morphology; Bathymetry; Continental shelves; Corsica; Geosciences; Paléo rivage; Quaternaire récent; Cartographie d'habitats; Sonar latéral; Hydrodynamisme; Sédimentologie; Morphologie; Bathymétrie; Plates formes continentales; Corse; Géosciences. Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/these-3363.pdf Réseau de surveillance benthique (REBENT) – Région Bretagne. Approche sectorielle subtidale : Identification et caractérisation des habitats benthiques du secteur Morlaix 5 Ehrhold, Axel; Hamon, Dominique; Chevalier, Claire. In 2000, Ifremer launched and coordinated the development of a monitoring strategy for the REBENT network (REseau BENThique) in order to assess the aftermath of the “Erika” oil spill which took place in December 1999. Its aim is to provide consistent baseline knowledge on coastal benthic habitats, as well as to develop a monitoring tool that detects changes at various spatial and temporal scales. Sector-based seabed habitat mapping in shallow water (< 50 m deep), is currently being conducted throughout Brittany's coastal waters using a combination of geoacoustic marine systems together with ground-truthing using biological grab sampling and seabed observations. Due to the overlap of soft and rocky bottoms, and contrasting hydrological conditions, the... Tipo: Text Palavras-chave: Rebent; Baie de Morlaix; Cartographie d’habitats; Sonar latéral; Macrofaune benthique; Peuplements; Dynamique sédimentaire; Figures sédimentaires; Rebent; Morlaix bay; Mapping; Sidescan sonar; Benthic macrofauna; Communities; Bedload transport; Bedforms. Ano: 2011 URL: http://archimer.ifremer.fr/doc/00152/26276/24360.pdf Réseau de surveillance benthique – Région Bretagne. Approche sectorielle subtidale : Identification et caractérisation des habitats benthiques du secteur Quiberon 5 Ehrhold, Axel; Hamon, Dominique; Chevalier, Claire; Gaffet, Jean-dominique; Caisey, Xavier; Blanchet, Aline; Alix, Anne-sophie. In 2000 Ifremer launched and coordinated the development of a monitoring strategy for the REBENT network (REseau BENThique) in order to assess the aftermath of the “Erika” oil spill which took place in December 1999. Its aim is to provide consistent baseline knowledge on coastal benthic habitats, as well as to develop a monitoring tool that detects changes at various spatial and temporal scales Sector-based seabed habitat mapping in shallow water (< 50 m deep), is currently being conducted throughout Brittany's coastal waters using a combination of geoacoustic marine systems together with ground-truthing using biological grab sampling and seabed observations. The study area in the bay of Quiberon is characterised by a large array of sedimentological... Tipo: Text Palavras-chave: Rebent; Baie de Quiberon; Cartographie d’habitats; Sonar latéral; Macrofaune benthique; Peuplements; Dynamique sédimentaire; Figures sédimentaires; Rebent; Quiberon bay; Mapping; Sidescan sonar; Benthic macrofauna; Communities; Bedload transport; Bedforms. Ano: 2010 URL: http://archimer.ifremer.fr/doc/00281/39179/37741.pdf Réseau de surveillance benthique – Région Bretagne. Approche sectorielle subtidale : Identification et caractérisation des habitats benthiques du secteur Trégor-Goëlo 5 Ehrhold, Axel; Chevalier, Claire; Alix, Anne-sophie; Autret, Elodie; Caisey, Xavier; Drussel, Benjamin; Gaffet, Jean-dominique; Hamon, Dominique; Houlgatte, Eric; Pluquet, Fabrice; Biscara, Laurie; Choisnet, Justine; Bajjouk, Touria. In 2000 Ifremer launched and coordinated the development of a monitoring strategy for the REBENT network (REseau BENThique) in order to assess the aftermath of the “Erika” oil spill which took place in December 1999. Its aim is to provide consistent baseline knowledge on coastal benthic habitats, as well as to develop a monitoring tool that detects changes at various spatial and temporal scales. Sector-based seabed habitat mapping in shallow water (< 50 m deep), is currently being conducted throughout Brittany's coastal waters using a combination of geoacoustic marine systems together with ground-truthing using biological grab sampling and seabed observations. Due to the extended area, the overlap of soft and rocky bottoms, and contrasting hydrological... Tipo: Text Palavras-chave: Rebent; Trégor-Goëlo; Bréhat; Cartographie d’habitats; Sonar latéral; Macrofaune benthique; Peuplements; Crépidule; Maërl; Sédiments; Morphologie; Dynamique sédimentaire; Rebent; Trégor-Goëlo; Bréhat archipelago; Marine habitat mapping; Sidescan sonar; Benthic macrofauna; Communities; Crepidula bed; Maerl; Sediment; Morphology; Bedload transpor. Ano: 2013 URL: http://archimer.ifremer.fr/doc/00280/39161/37724.pdf Structure and Drivers of Cold Seep Ecosystems 5 Foucher, Jean-paul; Westbrook, Graham K.; Boetius, Antje; Ceramicola, Silvia; Dupre, Stephanie; Mascle, Jean; Mienert, Jurgen; Pfannkuche, Olaf; Pierre, Catherine; Praeg, Daniel. Submarine hydrocarbon seeps are geologically driven "hotspots" of increased biological activity on the seabed. As part of the HERMES project, several sites of natural hydrocarbon seepage in the European seas were investigated in detail, including mud volcanoes and pockmarks, in study areas extending from the Nordic margin, to the Gulf of Cadiz, to the Mediterranean and Black seas. High-resolution seabed maps and the main properties of key seep sites are presented here. Individual seeps show ecosystem zonation related to the strength of the methane flux and distinct biogeochemical processes in surface sediments. A feature common to many seeps is the formation of authigenic carbonate constructions. These constructions exhibit various morphologies ranging... Tipo: Text Palavras-chave: Mosby mud volcano; Deep sea fan; Eastern mediterranean sea; Black sea; Anaerobic oxidation; Hydrocarbon seeps; Carbonate crusts; Sidescan sonar; Hydrate ridge; Gas chimneys. Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6387.pdf Swath bathymetry using phase difference: Theoretical analysis of acoustical measurement precision 5 Lurton, Xavier. The phase difference principle is widely applied nowadays to sonar systems used for sea floor bathymetry, The apparent angle of a target point is obtained from the phase difference measured between two close receiving arrays. Here we study the influence of the phase difference estimation errors caused by the physical structure of the backscattered signals. It is shown that, under certain current conditions, beyond the commonly considered effects of additive external noise and baseline decorrelation, the processing may be affected by the shifting footprint effect: this is due to the fact that the two interferometer receivers get simultaneous echo contributions coming from slightly shifted seabed parts, which results in a degradation of the signal coherence... Tipo: Text Palavras-chave: Sonar signal processing; Sidescan sonar; Sea floor bathymetry; Multibeam echosounder; Interferometry; Bathymetry precision; Acoustic scattering. Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/publication-710.pdf Widespread active seepage activity on the Nile Deep Sea Fan (offshore Egypt) revealed by high-definition geophysical imagery 5 Dupre, Stephanie; Woodside, John; Klaucke, Ingo; Mascle, Jean; Foucher, Jean-paul. Fluid escape structures on the Nile Deep Sea Fan were investigated during the MEDIFLUX MIMES expedition in 2004. Mud volcanoes, pockmarks and authigenic carbonate structures were surveyed for the first time with a high-resolution deep-towed 75 kHz sidescan sonar and a 2-8 kHz Chirp sediment echosounder. In combination with existing multibeam bathymetry and detailed seafloor in situ geological observations, these new data allowed detailed seep analyses. About 60 gas flares were detected acoustically in the water column from the sidescan sonar raw data at water depths from 770 to 1700 m. These gas flares coincide at the seabed with 1) the centres of the mud volcanoes where mud is also extruded, 2) the borders of the mud volcanoes where the emitted gases... Tipo: Text Palavras-chave: Nile Deep Sea Fan; Seepage; Backscatter; Sidescan sonar; High-resolution; Gas chimneys; Mud volcanoes; Authigenic carbonates. Ano: 2010 URL: http://archimer.ifremer.fr/doc/00013/12457/9766.pdf Registros recuperados: 8 Primeira ... 1 ... Última

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