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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Schaeffer, Amandine;

    L'hydrodynamique du Golfe du Lion, situé en Méditerranée Nord Occidentale, fait intervenir de nombreux processus physiques, présentant des échelles de variabilité spatiale et temporelle très hétérogènes. La plupart de ces processus sont générés en réponse aux conditions atmosphériques et en particulier au forçage du vent. Ce travail de thèse contribue à la compréhension de cet impact sur les processus de petit échelle et met en évidence l'intérêt de la haute-résolution de ces forçages. Dans un premier temps, une étude de processus a permis de mettre en évidence l'influence du vent sur la génération d'un tourbillon méso-échelle situé à l'Est du golfe, pécédemment observé par radars HF. Les influences respectives de la bathymétrie, des effets de flottabilité et de la circulation générale ont également été évaluées à l'aide de configurations idéalisées du modèle hydrodynamique MARS3D. Dans un deuxième temps, différents modèles atmosphériques, de résolutions différentes, ont été comparés en tant que forçage d'un modèle hydrodynamique réaliste du Golfe du Lion. D'un point de vue énergétique, les mouvements inertiels de la couche de surface, les oscillations de la thermocline et la variabilité méso-échelle de l'océan sont amplifiés avec le modèle atmosphérique haute- résolution AROME. Cette étude également permis de mettre en évidence l'importance de la variabilité spatiale du vent pour la génération de l'upwelling au Nord du plateau et les intrusions le long de la côte Ouest. Many physical processes are involved in the Gulf of Lions hydrody- namics, Mediterranean Sea, exhibiting high spatial and temporal variability. Their generation is often linked to atmospheric conditions and in particular to wind forcing. This works aims at understanding this influence on small scale processes and investigates the relevance of high resolution atmospheric forcing for hydrodynamic modeling. Firstly, the impact of the local wind forcing on the generation of a mesoscale eddy, previously observed by HF radars, is evidenced. Several idealized configurations also allow to analyze the role of river discharge, background shelf circulation and bathymetric effects, through idealized numerical modeling. Then, different atmospheric models are assessed to drive hydrodynamic modeling in the Gulf of Lions, with distinctive resolutions. Iner- tial motions, internal oscillations and mesoscale variability are shown to be accentuated when using high-resolution forcing. The importance of wind spatial variability is also evidenced, in terms of upwelling system and shelf intrusions.

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    Other literature type . 2010
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      Other literature type . 2010
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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: Salvany, T.; Lahitte, P.; Nativel, P.; Gillot, P.Y.;

    International audience; Reunion Island (Indian Ocean) is a volcanic complex whose eruptive history was dominated by the activity of two main edifices: Piton des Neiges (PN) and Piton de la Fournaise (PF) volcanoes. The tropical climate induces erosion processes that permanently compete with volcanic constructional processes. Exposed to the trade winds and associated heavy rainfalls, the northeastern part of the island exhibits the most complex morphological evolution. Geomorphological analysis, performed on a 50 m DEM and associated to new K-Ar ages has clarified the overall history of PN volcano. Each massif is assigned to one of the main building stages of the edifice. In addition, the arrangement of these different massifs reveals that the eruptive phases have led to successive relief inversions and successive excavations of large central depressions in the proximal area. As a result, the younger massifs are always located in more proximal parts of the volcano, the youngest being close to the edifice center. In distal areas, early lava flows were channeled into valleys incised along the massif boundaries, leading to a more complex geochronological organization. Quantitative study of the dissection of PN volcano allows us to propose a minimum eroded volume of 101 +/- 44 and 105 +/- 41 km(3) for the Mafate and Cilaos "Cirques" (depressions), respectively, during the last 180 kyr and a minimum average long-term erosion rate of 1.2 +/- 0.4 km(3)/ka. This leads us to estimate the removed volume during the whole history of PN volcano (> 1000 km(3)) as equivalent to the volume of the deposits identified on the submarine flanks of Piton des Neiges volcano. Therefore, as regressive erosion appears to be the prevailing geomorphic process during the whole PN history, it questions the presence of major flank collapses younger than 1.4 Ma on this volcano. Erosion processes have largely been neglected in recent models, but our study emphasizes them as a key component of landscape development and a major process in the morphological evolution of Reunion Island that has to be fully integrated in future studies. (C) 2011 Elsevier B.V. All rights reserved.

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    Geomorphology
    Article . 2012 . Peer-reviewed
    License: Elsevier TDM
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    Article . 2012
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Geomorphologyarrow_drop_down
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
      Geomorphology
      Article . 2012 . Peer-reviewed
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      Article . 2012
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Drap, Pierre; Long, Luc; Durand, Anne; Grussenmeyer, Pierre;

    The interdisciplinary work we present here is aimed principally at administering diverse types of information collected during an archaeological excavation using a single data management system. The approach is global, from the consultation of three- dimensional data to simple textual data to the addition of data captured by a digital photogrammetry system called l'Arpenteur [Surveyor], which is fully integrated to the data management system. We are using an object formalisation of the manipulated archaeological data using JAVA 1.3, the language chosen for all developments, from the digital photogrammetry tool to the three-dimensional model generator (VRML or JAVA 3D) used as a navigation interface in the database. Following a brief introduction to the archaeological context, and the special aspects of the excavation due to the great depth of the shipwreck, we will then present the existing system and explain the problems encountered. Not all of them have yet been resolved, such as the translation of objects to and from the relational DBMS, the revision of data coming from different sources, and the automatic generation of three-dimensional models as a navigation interface.

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    Other literature type . 2001
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  • Authors: Vincent, Pauline; Maussang, Frederic; Lurton, Xavier; Sintes, Christophe; +1 Authors

    International audience; This paper proposes a complete prediction of the noise level on the intereferometric phase difference measurement for bathymetric MBES, including baseline decorrelation and additive noise. This prediction allows to compare the performance of different pulse shapes (FM or CW). The results are compared to simulation and estimations and survey data, confirming their reliability.

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    Authors: Lies Loncke; Walter R. Roest; Frauke Klingelhoefer; Christophe Basile; +6 Authors

    International audience; Numerous submarine plateaus form highstanding bathymetric highs at continent to ocean transitions. Due to their proximity to continents, they have been frequently labelled “marginal plateaus”, although this term has not been clearly defined or associated with a specific geology or geodynamic process. Until now, these elevations have been interpreted as submerged thinned continental fragments detached from continents, basaltic buildups formed by hotspots, volcanic margins or oceanic plateaus. Many of these plateaus formed at transform margins connecting oceanic basins of contrasted ages. We propose for the first time to define and review a class of marginal plateaus related to a specific tectonic setting: “Transform Marginal Plateaus” (TMPs). Based on a compilation of 20 TMPs around the world, we show that most of them have a polyphased history and have undergone at least one major volcanic phase. Our review highlights in particular a hitherto unrecognized close link between hotspots, volcanic activity and transform margins. We also propose that, due to their polyphased history, TMPs may contain several successive basins and overlooked long-lived sedimentary archives. We finally highlight that, because these TMPs were transform plate boundaries perpendicular or oblique to surrounding rifts, many of them were close to last-contact points during final continental breakup and may have formed land bridges or bathymetric highs between continents. Therefore, we discuss broader scientific issues, such as the interest of TMPs in recording and studying the onset and variations of oceanic currents or past biodiversity growth, bio-connectivity and lineage evolution.

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    Earth-Science Reviews
    Article . 2020 . Peer-reviewed
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    Article . 2020
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    Conference object . 2019
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      Earth-Science Reviews
      Article . 2020 . Peer-reviewed
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      Article . 2020
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  • Authors: Vincent, Pauline; Lurton, Xavier; Maussang, Frederic; Garello, René;

    International audience; The latest generation of bathymetric multibeam echo sounders (MBES) uses frequency modulated (FM) signals with matched filtering using pulse compression in order to reach wider swath (by increasing the transmitted energy via pulse duration, resulting in a better SNR) while keeping a high accuracy (shorter efficient pulse duration).Practically, this makes possible measurements from deeper seafloor or wider swath where classical pulse shapes (CW) are not working. However, the comparison between bathymetric data from FM and CW systems shows that data from FM signals are often noisier than the one using CW signals. Why this paradoxical observation, since in theory the signal to noise ratio is increased by the matched filtering when using FM ?A first hypothesis for this bathymetric measurement degradation could be the Doppler effect induced by the motion of transmitting and receiving arrays (from roll, pitch, yaw, heave...). The received signal being thus shifted in frequency, it is not adapted anymore to the matched filtering, causing time fluctuations of the detected echoes. A study of Doppler effect impact on FM signal bathymetry has been conducted, concluding that Doppler effect cannot fully explicate bathymetric quality loss observed when using FM signals.Another explanation is that side lobes of the signal appearing after pulse compression play a role in the interferometric phase statistics, considering the angular (or baseline) decorrelation (the bathymetric quality being proportional to the interferometric phase fluctuation level). A modelling study comforted by simulations and field data measures has confirmed this hypothesis. The solution to the issue of performance degradation due to using FM could then be found in an adaptation of the signal design or the processing applied.

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    Authors: Bourguignon, Sébastien; Berger, Laurent; Scalabrin, Carla; Fablet, Ronan; +1 Authors

    Abstract Bourguignon, S., Berger, L., Scalabrin, C., Fablet, R., and Mazauric, V. 2009. Methodological developments for improved bottom detection with the ME70 multibeam echosounder. – ICES Journal of Marine Science, 66: 1015–1022. Multibeam echosounders and sonars are increasingly used in fisheries acoustics for abundance estimation. Because of reduced side-lobe levels in the beam-array pattern, the new Simrad ME70 multibeam echosounder installed on board Ifremer’s RV “Thalassa” has been designed to allow improved detection of fish close to the seabed. To achieve this objective, precise and unambiguous detection of the water-bottom interface is required, which raises the issue of bottom detection, especially in the outer beams. The bottom-detection method implemented in the ME70 is based on the amplitude of the reverberated echo. Such an approach is efficient for vertical beams, but less accurate for beams with higher incidence angles, typically 30°–40° for the beam configurations used on RV “Thalassa”, where the incidence angle, the beam opening, and the nature of the seabed contribute to weakening the backscattered signal. Therefore, the aim of this study was twofold. First, we proposed to improve the current bottom-detection method based on the amplitude of the echo. Thanks to the split-beam configuration being available for all beams of the ME70, we also proposed to use the phase information in the backscattered signals of the outer beams, as is more commonly done with multibeam systems dedicated to seabed mapping. Then, we set a Bayesian estimation framework that takes into account the spatial continuity between adjacent echoes, giving more robustness to the bottom estimation itself. Results using data collected at sea for various bottom types are presented here.

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    ICES Journal of Marine Science
    Article . 2009 . Peer-reviewed
    Data sources: Crossref
    Hyper Article en Ligne; Hal-Diderot
    Other literature type . Article . 2009
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      ICES Journal of Marine Science
      Article . 2009 . Peer-reviewed
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      Other literature type . Article . 2009
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    Authors: Dellong, David;

    Le bassin Ionien, en Méditerranée centrale, abrite une zone de subduction à vergence Nord-Ouest où la plaque Afrique plonge sous les blocs Calabro-Péloritain au Nord-Est de la Sicile. Cette subduction résulte de la lente convergence entre les plaques tectoniques Afrique et Eurasiatique. Bien que de nombreuses campagnes d’exploration scientifique ont été menées dans cette zone particulière, plusieurs questions géodynamiques restent débattues. Tout d’abord la croûte pavant le bassin Ionien pourrait être soit de nature continentale amincie et représenter une extension de la plaque Afrique, soit océanique (Néo-Téthys) faisant de ce bassin l’un des plus anciens domaines océaniques au monde. L’escarpement de Malte représente un vestige de l’ouverture du bassin, mais les mécanismes de rifting et notamment la géométrie d’ouverture du bassin restent débattus. Cette subduction est en retrait vers le Sud-Est depuis les derniers 35 Ma, mais est aujourd’hui confinée à l’étroit bassin Ionien. Afin d’accommoder ce retrait de la plaque plongeante dans le bassin, une grande faille de déchirure lithosphérique de bord de subduction (STEP fault en anglais pour « subduction Transform Edge Propagator ») doit se propager le long de la marge Est-Sicilienne. Cependant, sa position en surface reste difficile à déterminer dans l’épais prisme d’accrétion recouvrant le bassin. Ces questions ont été explorées par modélisation des données de sismique grand angle de la campagne DIONYSUS (Octobre 2014, R/V Meteor) le long de deux profils perpendiculaires à la marge Est-Sicilienne. Des modélisations gravimétriques en 3D ont aussi été réalisées dans le but de localiser la plaque plongeante en profondeur sous les blocs Calabro-Péloritains. La sismicité des trois structures majeures du bassin : l’escarpement de Malte, l’AFS (Alfeo Fault System), et l’IFS (Ionian Fault System) a permis d’étudier leurs activités à l’actuel. Les résultats obtenus permettent d’observer une croûte océanique au fond du bassin. La structure profonde de l’escarpement de Malte est observée comme une zone d’amincissement crustal abrupt, ce qui est caractéristique des marges transformantes. Un profond bassin sédimentaire asymétrique (11 km) est observé au Sud du détroit de Messine. Il s’est probablement ouvert récemment entre les blocs continentaux Péloritain et Calabre. Dans le lobe Ouest du prisme d’accrétion Calabrais, le modèle de vitesse permet d’observer l’indentation du prisme clastique interne dans le prisme évaporitique externe. Des modélisations analogiques utilisant sable et silicone ont permis de démontrer la récente activité de ce lobe. L’interprétation des modèles de vitesse permet de localiser la faille STEP le long de l’AFS sur les deux profils. In the Ionian Sea (central Mediterranean) the slow convergence between Africa and Eurasia results in the formation of a narrow subduction zone. The nature of the crust of the subducting plate remains debated and could represent the last remnants of the Neo-Tethys ocean. The origin of the Ionian basin is also under discussion, especially concerning the rifting mechanisms as the Malta Escarpment could represent a remnant of this opening. This subduction retreats toward the south-east (motion occurring since the last 35 Ma) but is confined to the narrow Ionian basin. A major lateral slab tear fault is required to accommodate the slab rollback.This fault is thought to propagate along the eastern Sicily margin but its precise location remains controversial.This PhD project focussed on the deep sedimentary and crustal structures of the eastern Sicily margin and the Malta Escarpment (ME). Two two-dimensional P wave velocity models were modelled by forward Modelling of wide-angle seismic data, acquired onboard the R/V Meteor during the DIONYSUS cruise in 2014.A 3D gravity model of the region was also performed to constrain the depth of the subducting slab bellow the Calabro-Peloritan backstops. The seismicity of the three structures identified in the velocity models (ME, Alfeo fault System, Ionian Fault System) permits to study their recent activity. The results image an oceanic crust within the Ionian basin as well as the deep structure of the Malta Escarpment, which presents characteristics of a transform margin. A deep and asymmetrical sedimentary basin is imaged south of the Messina strait and seems to have opened between the Calabrian and Peloritan continental terranes. In the western lobe of the Calabrian accretionary prism, the southern velocity model allows to observe the indentation of the internal clastic wedge into the external evaporitic wedge, thus showing the recent activity of this lobe. The interpretation of the velocity models suggests that the major STEP fault is located east of the Malta Escarpment, along the Alfeo Fault System.

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      Doctoral thesis . 2018
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    Authors: Gaurier, Benoit;

    Dans le contexte actuel du réchauffement climatique, l’extraction de l’énergie des courants marins par des hydroliennes se doit d’intégrer le mix énergétique de demain. Ces machines étant confrontées à un environnement marin difficile, il est nécessaire de connaître leur comportement dans des conditions de fonctionnement réaliste pour garantir une utilisation optimale. Dans ces travaux, les performances d’une hydrolienne sont étudiées, quand la machine est soumise à un courant turbulent ou aux effets combinés de la houle et du courant. La représentation physique des essais à échelle réduite est d’abord abordée, en se focalisant sur la caractérisation de l’écoulement incident et ses effets sur une maquette d’hydrolienne à l’échelle 1/20. La position et le type de mesure de la vitesse amont sont discutés afin de définir avec précision ses performances et sa réponse temporelle et spectrale. Ces éléments sont essentiels dans la définition des standards de certification des modélisations expérimentales. La représentation de variations bathymétriques permet de générer des écoulements turbulents, caractérisés par le passage de structures tourbillonnaires de la taille du rotor. La réponse de la machine est déterminée de manière globale et locale, pour plusieurs positions relatives de la machine par rapport aux obstacles. Les effets combinés de la houle et du courant sur le comportement de la machine sont étudiés à partir de résultats de mesures obtenues dans trois infrastructures d’essais. Des différences significatives entre les bassins apparaissent et une discussion sur leur origine est menée. In the context of global warming, the extraction of energy by tidal turbines from marine currents must be integrated into the future energetic mix. Being confronted with a difficult marine environment, it is required to know the turbines’ behaviour when they are submitted to realistic solicitations to guarantee an optimal use. In this work, the marine turbine performance is studied when the machine is submitted to a turbulent current or a combined wave-current effect. The physical representation of trials at reduced scale is first described focusing on the incoming flow characterisation and its effects on a turbine model at 1:20 scale. The location and measurement type of the upstream velocity are discussed to accurately define its performance and its temporal and spectral response. Such parameters are essential in the definition of certification standards for experimental modelling. The bathymetric variation representation enables turbulent flow to be generated. They are mainly characterized by large eddies with a size corresponding to the rotor. The turbine response is determined in a global and local way for many relative turbine locations versus the obstacles. The combined wave and current effects on the turbine behaviour are studied from measurement results carried out in three facilities. Significant differences between the tanks appear and a discussion on their origin is proposed.

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  • Authors: Creuze, Vincent; Jouvencel, Bruno;

    This paper introduces a method aiming to allow underactuated autonomous underwater vehicles navigating in an unknown environment to avoid underwater cliffs. Three electro-acoustic transducers situated in the front part of the vehicle provide bathymetric data. In this article we detail the method adapted to an irregular seabed, i.e., with substantial changes in depth like underwater cliffs. The obtained trajectories respect the dynamic constraints of the vehicle. We also explain how to choose the orientation angle of transducers in order to optimize the quality of seabed following. Our method was validated with the hydrodynamic simulator of the "Taipan" vehicle, which is our laboratory's autonomous underwater vehicle prototype.

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    Authors: Schaeffer, Amandine;

    L'hydrodynamique du Golfe du Lion, situé en Méditerranée Nord Occidentale, fait intervenir de nombreux processus physiques, présentant des échelles de variabilité spatiale et temporelle très hétérogènes. La plupart de ces processus sont générés en réponse aux conditions atmosphériques et en particulier au forçage du vent. Ce travail de thèse contribue à la compréhension de cet impact sur les processus de petit échelle et met en évidence l'intérêt de la haute-résolution de ces forçages. Dans un premier temps, une étude de processus a permis de mettre en évidence l'influence du vent sur la génération d'un tourbillon méso-échelle situé à l'Est du golfe, pécédemment observé par radars HF. Les influences respectives de la bathymétrie, des effets de flottabilité et de la circulation générale ont également été évaluées à l'aide de configurations idéalisées du modèle hydrodynamique MARS3D. Dans un deuxième temps, différents modèles atmosphériques, de résolutions différentes, ont été comparés en tant que forçage d'un modèle hydrodynamique réaliste du Golfe du Lion. D'un point de vue énergétique, les mouvements inertiels de la couche de surface, les oscillations de la thermocline et la variabilité méso-échelle de l'océan sont amplifiés avec le modèle atmosphérique haute- résolution AROME. Cette étude également permis de mettre en évidence l'importance de la variabilité spatiale du vent pour la génération de l'upwelling au Nord du plateau et les intrusions le long de la côte Ouest. Many physical processes are involved in the Gulf of Lions hydrody- namics, Mediterranean Sea, exhibiting high spatial and temporal variability. Their generation is often linked to atmospheric conditions and in particular to wind forcing. This works aims at understanding this influence on small scale processes and investigates the relevance of high resolution atmospheric forcing for hydrodynamic modeling. Firstly, the impact of the local wind forcing on the generation of a mesoscale eddy, previously observed by HF radars, is evidenced. Several idealized configurations also allow to analyze the role of river discharge, background shelf circulation and bathymetric effects, through idealized numerical modeling. Then, different atmospheric models are assessed to drive hydrodynamic modeling in the Gulf of Lions, with distinctive resolutions. Iner- tial motions, internal oscillations and mesoscale variability are shown to be accentuated when using high-resolution forcing. The importance of wind spatial variability is also evidenced, in terms of upwelling system and shelf intrusions.

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    Authors: Salvany, T.; Lahitte, P.; Nativel, P.; Gillot, P.Y.;

    International audience; Reunion Island (Indian Ocean) is a volcanic complex whose eruptive history was dominated by the activity of two main edifices: Piton des Neiges (PN) and Piton de la Fournaise (PF) volcanoes. The tropical climate induces erosion processes that permanently compete with volcanic constructional processes. Exposed to the trade winds and associated heavy rainfalls, the northeastern part of the island exhibits the most complex morphological evolution. Geomorphological analysis, performed on a 50 m DEM and associated to new K-Ar ages has clarified the overall history of PN volcano. Each massif is assigned to one of the main building stages of the edifice. In addition, the arrangement of these different massifs reveals that the eruptive phases have led to successive relief inversions and successive excavations of large central depressions in the proximal area. As a result, the younger massifs are always located in more proximal parts of the volcano, the youngest being close to the edifice center. In distal areas, early lava flows were channeled into valleys incised along the massif boundaries, leading to a more complex geochronological organization. Quantitative study of the dissection of PN volcano allows us to propose a minimum eroded volume of 101 +/- 44 and 105 +/- 41 km(3) for the Mafate and Cilaos "Cirques" (depressions), respectively, during the last 180 kyr and a minimum average long-term erosion rate of 1.2 +/- 0.4 km(3)/ka. This leads us to estimate the removed volume during the whole history of PN volcano (> 1000 km(3)) as equivalent to the volume of the deposits identified on the submarine flanks of Piton des Neiges volcano. Therefore, as regressive erosion appears to be the prevailing geomorphic process during the whole PN history, it questions the presence of major flank collapses younger than 1.4 Ma on this volcano. Erosion processes have largely been neglected in recent models, but our study emphasizes them as a key component of landscape development and a major process in the morphological evolution of Reunion Island that has to be fully integrated in future studies. (C) 2011 Elsevier B.V. All rights reserved.

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    Geomorphology
    Article . 2012 . Peer-reviewed
    License: Elsevier TDM
    Data sources: Crossref
    Hal-Diderot
    Article . 2012
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      Geomorphology
      Article . 2012 . Peer-reviewed
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      Article . 2012
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    Authors: Drap, Pierre; Long, Luc; Durand, Anne; Grussenmeyer, Pierre;

    The interdisciplinary work we present here is aimed principally at administering diverse types of information collected during an archaeological excavation using a single data management system. The approach is global, from the consultation of three- dimensional data to simple textual data to the addition of data captured by a digital photogrammetry system called l'Arpenteur [Surveyor], which is fully integrated to the data management system. We are using an object formalisation of the manipulated archaeological data using JAVA 1.3, the language chosen for all developments, from the digital photogrammetry tool to the three-dimensional model generator (VRML or JAVA 3D) used as a navigation interface in the database. Following a brief introduction to the archaeological context, and the special aspects of the excavation due to the great depth of the shipwreck, we will then present the existing system and explain the problems encountered. Not all of them have yet been resolved, such as the translation of objects to and from the relational DBMS, the revision of data coming from different sources, and the automatic generation of three-dimensional models as a navigation interface.

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  • Authors: Vincent, Pauline; Maussang, Frederic; Lurton, Xavier; Sintes, Christophe; +1 Authors

    International audience; This paper proposes a complete prediction of the noise level on the intereferometric phase difference measurement for bathymetric MBES, including baseline decorrelation and additive noise. This prediction allows to compare the performance of different pulse shapes (FM or CW). The results are compared to simulation and estimations and survey data, confirming their reliability.

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    Authors: Lies Loncke; Walter R. Roest; Frauke Klingelhoefer; Christophe Basile; +6 Authors

    International audience; Numerous submarine plateaus form highstanding bathymetric highs at continent to ocean transitions. Due to their proximity to continents, they have been frequently labelled “marginal plateaus”, although this term has not been clearly defined or associated with a specific geology or geodynamic process. Until now, these elevations have been interpreted as submerged thinned continental fragments detached from continents, basaltic buildups formed by hotspots, volcanic margins or oceanic plateaus. Many of these plateaus formed at transform margins connecting oceanic basins of contrasted ages. We propose for the first time to define and review a class of marginal plateaus related to a specific tectonic setting: “Transform Marginal Plateaus” (TMPs). Based on a compilation of 20 TMPs around the world, we show that most of them have a polyphased history and have undergone at least one major volcanic phase. Our review highlights in particular a hitherto unrecognized close link between hotspots, volcanic activity and transform margins. We also propose that, due to their polyphased history, TMPs may contain several successive basins and overlooked long-lived sedimentary archives. We finally highlight that, because these TMPs were transform plate boundaries perpendicular or oblique to surrounding rifts, many of them were close to last-contact points during final continental breakup and may have formed land bridges or bathymetric highs between continents. Therefore, we discuss broader scientific issues, such as the interest of TMPs in recording and studying the onset and variations of oceanic currents or past biodiversity growth, bio-connectivity and lineage evolution.

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    Earth-Science Reviews
    Article . 2020 . Peer-reviewed
    License: Elsevier TDM
    Data sources: Crossref
    Hal-Diderot
    Article . 2020
    Data sources: Hal-Diderot
    Hal-Diderot
    Conference object . 2019
    Data sources: Hal-Diderot
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