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Registros recuperados: 12
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Bilan des tempêtes de l’hiver 2013-2014 sur la dynamique de recul du trait de côte en Bretagne ArchiMer
Blaise, Emmanuel; Suanez, Serge; Stephan, Pierre; Fichaut, Bernard; David, Laurence; Cuq, Veronique; Autret, Ronan; Houron, Julien; Rouan, Mathias; Floc'H, France; Ardhuin, Fabrice; Cancouet, Romain; Davidson, Robert; Costa, Stephane; Delacourt, Christophe.
Between December 2013 and March 2014, a cluster of about 12 storm events hit the coast of Brittany with an exceptional frequency. It was in February that these storm events were the most frequent and particularly virulent. The significant wave heights measured off Finistere reached respectively 12.3 m and 12.4 m during Petra and Ulla storms on February 5 and 14. However, analysis of hydrodynamic conditions shows that only three episodes promoted extreme morphogenetic conditions because they were combined with high spring tide level. The first one occurred on January 1 to 4, it was followed by events from February 1 to 3, and March 2-3. During these three extreme events observed tide levels were above highest astronomical tide level (HAT). Maximum surge...
Tipo: Text Palavras-chave: Tempête; Érosion; Trait de côte; Marée de vive-eau; Bretagne; Surcote; Storm; High spring tide; Surge; Erosion; Shoreline; Brittany.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00310/42171/43029.pdf
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Coastal Ocean and Nearshore Observation: A French Case Study ArchiMer
Cocquempot, Lucie; Delacourt, Christophe; Paillet, Jerome; Riou, Philippe; Aucan, Jérôme; Castelle, Bruno; Charria, Guillaume; Claudet, Joachim; Conan, Pascal; Coppola, Laurent; Hocdé, Régis; Planes, Serge; Raimbault, Patrick; Savoye, Nicolas; Testut, Laurent; Vuillemin, Renaud.
To understand and predict the physical, chemical, and biological processes at play in coastal and nearshore marine areas requires an integrated, interdisciplinary approach. The case study of the French structuration of coastal ocean and nearshore observing systems provides an original overview on a federative research infrastructure named ILICO. It is a notable example of national structuration and pan-institution efforts to investigate the forefront of knowledge on the processes at work within the critical coastal zone. ILICO comprises, in a pluridisciplinary approach, eight distributed network-systems of observation and data analysis that are accredited and financially supported by French research institutions and the French Ministry for Higher...
Tipo: Text Palavras-chave: Observation infrastructure; National structuration; Interdisciplinary; Coastal ocean; Coastline.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00503/61489/65292.pdf
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Direct sediment transfer from land to deep-sea: Insights into shallow multibeam bathymetry at La Réunion Island ArchiMer
Babonneau, Nathalie; Delacourt, Christophe; Cancouet, R.; Sisavath, Emmanuelle; Bachelery, Patrick; Mazuel, Aude; Jorry, Stephan; Deschamps, Anne; Ammann, Jerome; Villeneuve, N..
Submarine canyon heads are key areas for understanding the triggering factors of gravity currents responsible for the transfer of detrital sediment to the deep basins. This contribution offers a detailed picture of canyon heads off La Réunion Island, with high-resolution multibeam bathymetry in the water depth range of 4–220 m. The present feeding of the Cilaos turbidite system, one of the largest modern volcaniclastic systems in the world, is deduced from morphological and sedimentological interpretations of newly acquired data. The study highlights small-scale sedimentary features indicating hydrodynamic and sedimentary processes. A direct connexion between the Saint-Etienne river mouth and submarine canyons is evidenced by the complete incision of the...
Tipo: Text Palavras-chave: Submarine canyon; Canyon head; Turbidity current; Hyperpycnal flow; Coastal instability.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00156/26697/24790.pdf
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Holocene formation and evolution of coastal dunes ridges, Brittany (France) ArchiMer
Van Vliet-lanoe, Brigitte; Goslin, Jerome; Henaff, Alain; Hallegouet, Bernard; Delacourt, Christophe; Le Cornec, Erwan; Meurisse-fort, Murielle.
Holocene coastal dune formation under a continuously rising sea level (SL) is an abnormal response to increasing storm frequency. The aim of this work is to understand the coastal sedimentary budget and the present-day sand starvation, controlled by climate and man. Dating in Brittany shows that Aeolian deposition initiated from ca. 4000 cal BP, with the slowing down of the SL rise. Pre-historical dunes appeared here from ca. 3000 cal BP, without SL regression. After, further building phases recycled the same stock of sands. Historical dunes I developed from ca. 350 AD. Major storms between 900 and 1200 AD resulted in the construction of washover coastal ridges, the Historical dunes II. A part of the sand was evacuated offshore. From ca. 1350 AD, the...
Tipo: Text Palavras-chave: Dunes; Holocene; Climate; Sand starvation; Anthropic perturbation.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00591/70262/68321.pdf
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HYSCORES : Cartographies hyperspectrales appliquées aux écosystèmes coralliens et à leur état de santé. ArchiMer
Ropert, Michel; Mouquet, Pascal; Bajjouk, Touria; Delacourt, Christophe.
En 2013, les résultats des travaux menés dans le cadre des projets "Spectrhabent-OI" (2009-2012), étendus au projet "Bioindication" (2012-2013) ont permis d'illustrer le potentiel important représenté par les nouvelles techniques d'imagerie aérienne hyperspectrale appliquées sur les plateformes récifales de l'île de La Réunion. L'objectif principal du projet HYSCORES (2015-2016) est de consolider ces premiers résultats dans une perspective de mise en œuvre opérationnelle de ces nouvelles méthodes dans le cadre de la DCE (directive-cadre européenne sur l’eau (2000/60/CE)). Pour cela 3 axes de recherche sont proposés : 1) l’étude et l'évaluation de la pertinence de l'indicateur VCH (vitalité corallienne hyperspectrale) proposé en 2012 ; 2) la capacité de...
Tipo: Text Palavras-chave: Océan Indien; La Réunion; Récifs coralliens; Télédétection; Hyperspectral; Imagerie; Cartographie; Indicateur; Vitalité corallienne; Recouvrements; Algue; Corail; Sable; Herbier.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00350/46122/45820.pdf
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HYSCORES : Cartographies hyperspectrales appliquées aux écosystèmes coralliens et à leur état de santé. Rapport intermédiaire de fin de campagne d'acquisition ArchiMer
Mouquet, Pascal; Ropert, Michel; Bajjouk, Touria; Delacourt, Christophe.
En 2013, les résultats des travaux menés dans le cadre des projets "Spectrhabent-OI" (2009-2012), étendus au projet "Bioindication" (2012-2013) ont permis d'illustrer le potentiel important représenté par les nouvelles techniques d'imagerie aérienne hyperspectrale appliquées sur les plateformes récifales de l'île de La réunion. Au-delà de l'apport de l'hyperspectral dans une dimension descriptive, il a été montré que la combinaison d'indices de couverture algale et corallienne permettait d'envisager l’élaboration d’un indice surfacique d'état, adapté aux plateformes récifales, appelé "vitalité corallienne hyperspectrale" (VCH). L'objectif principal du projet HYSCORES (2015-2016) est de consolider ces premiers résultats tout en évaluant les possibilités de...
Tipo: Text Palavras-chave: Océan Indien; La Réunion; Récifs coralliens; Hyperspectral; Imagerie; Cartographie; Indicateur; Vitalité corallienne; Recouvrements; Algues; Corail; Sable; Herbiers.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00320/43144/42694.pdf
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In Situ Quantification of the Suspended Load of Estuarine Aggregates from Multifrequency Acoustic Inversions ArchiMer
Fromant, G.; Floc'H, F.; Lebourges-dhaussy, Anne; Jourdin, F.; Perrot, Yannick; Le Dantec, N.; Delacourt, Christophe.
The study of the suspended particulate matter (SPM) transport is essential to understanding oceans and rivers, for their presence can impact the environment, from marine habitats or water quality degradations to important changes of the seabed morphology. Among a large number of surrogate techniques in traditional water sampling, acoustical methods have the advantage of providing nonintrusive measurements, with high spatial and temporal resolutions. However, the ability of fine-grained sediments to aggregate under the process of flocculation complexifies the interpretation of acoustical measurements. The objective of this paper is to design a simple backscatteringmodel for flocculated sediment suspensions, in order to interpret the information provided by...
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Ano: 2017 URL: https://archimer.ifremer.fr/doc/00616/72809/72590.pdf
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Le Continuum Homme-Terre-Mer ArchiMer
Garnier, Josette; Castelle, Bruno; Labille, Jérôme; Souchu, Philippe; Thieu, Vincent; Delacourt, Christophe.
L’interface entre l’atmosphère et les surfaces continentales est un lieu d’échanges importants d’énergie et de matière liquide, solide ou gazeuse. Aussi, comprendre et quantifier les interactions entre surfaces et atmosphère est un enjeu de premier ordre pour essayer d’anticiper au mieux les conséquences de nouvelles et futures évolutions des surfaces continentales, que ce soit sous l’effet de l’évolution du climat ou de modifications de l’usage des sols. Des processus spécifiques se produisent à l’interface surface-atmosphère, rendant nécessaire l’étude de cette interface non comme un simple lieu de transfert, mais en tant qu’objet propre. S’attacher à identifier et quantifier les processus opérant dans le continuum sol-eau-plante-atmosphère doit...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00603/71464/69919.pdf
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Observations and Predictions of Wave Runup, Extreme Water Levels, and Medium-Term Dune Erosion during Storm Conditions ArchiMer
Suanez, Serge; Cancouet, Romain; Floc'H, France; Blaise, Emmanuel; Ardhuin, Fabrice; Filipot, Jean-francois; Cariolet, Jean-marie; Delacourt, Christophe.
Monitoring of dune erosion and accretion on the high-energy macrotidal Vougot beach in North Brittany (France) over the past decade (2004–2014) has revealed significant morphological changes. Dune toe erosion/accretion records have been compared with extreme water level measurements, defined as the sum of (i) astronomic tide; (ii) storm surge; and (iii) vertical wave runup. Runup parameterization was conducted using swash limits, beach profiles, and hydrodynamic (Hm0, Tm0,–1, and high tide water level—HTWL) data sets obtained from high frequency field surveys. The aim was to quantify in-situ environmental conditions and dimensional swash parameters for the best calibration of Battjes [1] runup formula. In addition, an empirical equation based on observed...
Tipo: Text Palavras-chave: Macrotidal beach; Runup; Storm; Dune; Erosion; Extreme water level; NAO.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00276/38765/37306.pdf
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Potential of UAVs for Monitoring Mudflat Morphodynamics (Application to the Seine Estuary, France) ArchiMer
Jaud, Marion; Grasso, Florent; Le Dantec, Nicolas; Verney, Romaric; Delacourt, Christophe; Ammann, Jerome; Deloffre, Julien; Grandjean, Philippe.
Intertidal mudflats play a critical role in estuarine exchange, connecting marine and continental supplies of nutrients and sediments. However, their complex morphodynamics, associated with a wide range of physical and biological processes, are still poorly understood and require further field investigation. In addition, mudflats are challenging areas for Structure-from-Motion (SfM) photogrammetric surveys. Indeed, the mudflats generally hold back residual tidal water, which can make stereo restitution particularly difficult because of poor correlations or sun-glint effects. This study aims to show the potential of light UAVs (Unmanned Aerial Vehicles) for monitoring sedimentary hydrodynamics at different spatial scales in a silty estuary. For each UAV...
Tipo: Text Palavras-chave: Coastal monitoring; Unmanned Aerial Vehicle; Photogrammetry; Estuary; Mudflat areas; Morphological features.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00326/43721/43167.pdf
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Projet Bio indication à La Réunion. Contribution au développement d’indicateurs adaptés aux platiers récifaux de La Réunion. Rapport final 2012 ArchiMer
Le Goff, Ronan; Ropert, Michel; Bajjouk, Touria; Bein, Aymeric; Cambert, Harold; Cebeillac, Alexandre; Cuet, Pascale; Delacourt, Christophe; Duval, Magali; Maurel, Laurence; Mouquet, Pascal; Nicet, Jean Benoit; Populus, Jacques; Quod, Jean-pascal; Talec, Pascal; Turquet, Jean; Vermenot, Coralie; Zubia, Mayalen.
Le présent document est le rapport final du projet "Bio-Indication à la Réunion ; contribution à la définition d’indicateurs adaptés aux platiers récifaux de la Réunion". Ce projet comprend deux volets : Volet 1 : définition d’indicateurs d’enrichissement en nutriments (dystrophie) adaptés aux platiers récifaux réunionnais. Une importante phase d’acquisition de données de terrain portant sur les algues, les cyanobactéries, le corail, la faune associée et les caractéristiques hydrologiques des différents secteurs retenus a été menée entre fin 2010 et fin 2011 sur une année hydrologique complète afin d’essayer de bâtir des indicateurs d’état DCE adaptés aux masses d’eau récifales de la Réunion, et plus précisément des indicateurs de dystrophie. Ce volet...
Tipo: Text Palavras-chave: Habitats benthiques des platiers récifaux réunionnais; Indicateurs d’enrichissement en nutriments ou de dystrophie; Algues; Corail; Cartographie; Zone intertropicale; La Réunion; Océan Indien; DCE.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00209/32022/30459.pdf
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Turbidity current activity along the flanks of a volcanic edifice: The mafate volcaniclastic complex, La Réunion Island, Indian Ocean ArchiMer
Mazuel, Aude; Sisavath, Emmanuelle; Babonneau, Nathalie; Jorry, Stephan; Bachelery, Patrick; Delacourt, Christophe.
Recent marine geophysical surveys reveal the existence of well-developed volcaniclastic deep-sea fans around La Réunion Island, Indian Ocean. The Mafate turbidite complex, located in the northwestern part of the island, is a large sedimentary system formed by two coalescent-like volcaniclastic deep-sea fans: the Mafate fan and the Saint-Denis fan. They are both connected to terrestrial rivers supplying sediment produced by erosion on the island, particularly during austral summer cyclonic floods. Through the integration of marine geophysical data (including bathymetry, backscatter multibeam sounder images, TOBI side-scan sonar images and seismic reflection profiles) and piston cores, a submarine morpho-sedimentary map of the surface architecture of the...
Tipo: Text Palavras-chave: Deep-sea fan; Turbidite; Volcaniclastic; Land-to-sea transfer; La Reunion Island; Late Quaternary.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00312/42273/41597.pdf
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