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| Dennielou, Bernard; Jallet, Laurent; Sultan, Nabil; Jouet, Gwenael; Giresse, Pierre; Voisset, Michel; Berne, Serge. |
| Emplacement of post-glacial turbidites is commonly controlled by rapid changes in sea level or by seismicity. On the continental rise of the Gulf of Lions (Western Mediterranean), an aseismic area, we identified turbiditic beds deposited during the rising stage and highstand of sea level. Swath bathymetry, sediment cores, in situ Cone Penetrating Tests (CPTU), heavy mineral associations and radiocarbon dating determined the source, composition, distribution and age of the turbiditic beds. Turbidites are composed of homogeneous to positively graded silts to medium sand with quartz (up to 90%), shell debris and shelfal benthic faunas. Their distribution on the sea floor is very patchy and controlled by abundant inherited erosional bedforms. Their source is... |
| Tipo: Text |
Palavras-chave: Holocene; Late Pleistocene; Sea level; Turbidites; Sand; Outer shelf; Canyons. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6316.pdf |
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| De Mol, Lies; Van Rooij, David; Pirlet, Hans; Greinert, Jens; Frank, Norbert; Quemmerais-amice, Frederic; Henriet, Jean-pierre. |
| In 1948, Le Danois reported for the first time the occurrence of living cold-water coral reefs, the so-called "massifs coralliens", along the European Atlantic continental margin. In 2008, a cruise with R/V Belgica was set out to re-investigate these cold-water corals in the Penmarc'h and Guilvinec Canyons along the Gascogne margin of the Bay of Biscay. During this cruise, an area of 560 km(2) was studied using multibeam swath bathymetry, CTD casts, ROV observations and USBL-guided boxcoring. Based on the multibeam data and the ROV video imagery, two different cold-water coral reef settings were distinguished. In water depths ranging from 260 to 350 m, mini mounds up to 5 m high, covered by dead cold-water coral rubble, were observed. In between these... |
| Tipo: Text |
Palavras-chave: Bay of Biscay; Continental margin; Canyons; Cold-water corals; Lophelia; Madrepora. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00035/14632/13318.pdf |
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| Van Den Beld, Inge; Guillaumont, Brigitte; Menot, Lenaick; Bayle, Christophe; Arnaud-haond, Sophie; Bourillet, Jean-francois. |
| Marine litter is a matter of increasing concern worldwide, from shallow seas to the open ocean and from beaches to the deep-seafloor. Indeed, the deep sea may be the ultimate repository of a large proportion of litter in the ocean. We used footage acquired with a Remotely Operated Vehicle (ROV) and a towed camera to investigate the distribution and composition of litter in the submarine canyons of the Bay of Biscay. This bay contains many submarine canyons housing Vulnerable Marine Ecosystems (VMEs) such as scleractinian coral habitats. VMEs are considered to be important for fish and they increase the local biodiversity. The objectives of the study were to investigate and discuss: i) litter density, ii) the principal sources of litter, iii) the influence... |
| Tipo: Text |
Palavras-chave: Litter; Anthropogenic impact; Canyons; Deep Sea; Bay of Biscay; ROV; Towed camera. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00332/44363/43968.pdf |
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| Fabri, Marie-claire; Opderbecke, Jan; Pairaud, Ivane; Drogou, Michele. |
| L'objectif de la campagne était double : (1) réaliser différents tests : AUV et tests acoustiques ainsi que la cartographie de la zone du futur observatoire de neutrinos (2) réaliser la micro-cartographie du fond ainsi que l'acquisition de paramètres environnementaux hydrodynamiques dans une zone accidentée sur laquelle on trouve des écosystèmes marins vulnérables (canyons de Cassidaigne et du Planier). La réalisation de cartographies fines (résolution 2 m) dans une zone accidentée au moyen d'un AUV était un challenge technologique car cet engin autonome est conçu pour naviguer sur des zones planes. Habituellement les consignes de navigation utilisées sont de naviguer à 70 m d'altitude et d'utiliser une fréquence d'acquisition de 300Khz. Ses contraintes de... |
| Tipo: Text |
Palavras-chave: Essais AUV; Bathymétrie fine; Courantologie; Tests acoustiques; Canyons; Méditerranée. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00233/34401/32807.pdf |
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