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Registros recuperados: 27
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Etude numérique du train de pêche d'un chalutier (DEA) ArchiMer
Theret, Francois.
IFREMER aims at digitalizing trawl gear in order to reach two goals: on the one hand, participating in the realisation of a computer assisted trawl conception software; on the other hand, being able to study quickly and easily the influence of different adjustment parameters on the shape of the trawl in order to indicate to the skipper, if possible in real time, the optimal adjustment for the conditions he's in. From an international point of view, there are only two strategies to approach this problem: - the first strategy is based on statistical studies on the existing nets (almost limited to their reproduction on different scales), but this approach does not leave much room for innovation as it can only be applied to the same type of nets as those that...
Tipo: Text Palavras-chave: Experimentation; Optimization; Adjustment; Hydrodynamic; Modelization; Trawl gear; Trawl; Expérimentation; Maquette de chalut; Optimisation; Réglage; Hydrodynamique; Modèle numérique; Train de pêche; Chalut.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/these-3627.pdf
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Modélisation de l'emprise BAST - Modèle 100m de la région de BASTIA. Document I : Construction du modèle aspects opérationnels ArchiMer
Gerigny, Olivia; Coudray, Sylvain.
Document descriptif de la construction du modèle hydrodynamique des eaux de la méditerranée autour de la Région de Bastia (Haute-Corse).
Tipo: Text Palavras-chave: Modélisation; MARS3D; BASTIA; CORSE; Hydrodynamique.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00154/26489/24598.pdf
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Application du modèle MARS-3D à la rade de Toulon. Comparaison à des données historiques ArchiMer
Tessier, Caroline.
Développé par le laboratoire DEL/AO à Brest et appliqué à la rade de Toulon, le modèle MARS-3D a été installé au laboratoire de Toulon. L'objectif est de mettre en route son application à Toulon et de contribuer à l'analyse en cours des résultats du modèle, en les· comparant aux mesures historiques. Dans ce rapport sont présentés les travaux faits pour réaliser ce double objectif: l'apprentissage du modèle dans sa conception et son utilisation, l'analyse des résultats et la comparaison avec des mesures ainsi qu'une simulation de traceurs. La comparaison du modèle avec les données a été réalisée sur la base des enregistrements faits en 1986-1987 en un point de mesure au centre de la grande rade. Or, l'emboîtement des modèles crée une contrainte sur le...
Tipo: Text Palavras-chave: Modèle; Tridimensionnel; Méditerranée; Hydrodynamique; Validation; Toulon.
Ano: 2001 URL: https://archimer.ifremer.fr/doc/00431/54248/59141.pdf
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Étude par télédétection de la dispersion en mer des eaux estuariennes issues de la Gironde et du Pertuis de Maumusson ArchiMer
Castaing, P; Allen, Gp; Houdart, Michel; Moign, Y.
The objective of this study, carried out in the Gironde estuary inlet, was to determine the nature of the seaward dispersion of estuarine water and suspended sediments during a spring tide and high river flow. On June 3, 19(7, three flights were made over the inlet, at mid ebb, low tide and mid flood. The planned flight at high tide was cancelled due to adverse meteorological conditions. During each flight, thermal infrared coverage was obtained, together with black and white photographs. These data were correlated with concomitant ground mesures of current velocity, salinity, temperature and suspended sediment concentration Four types of water masses were identified during the tidal cycle: estuarine "very warm and turbid" water; estuarine "cooler and...
Tipo: Text Palavras-chave: Hydrodynamique; Suspensions; Télédétection; Eaux côtières; Estuaire; Gironde; Hydrodynamic; Suspended sediments; Remote sensing; Coastal waters; Estuary; Gironde.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00122/23361/21188.pdf
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Estimation des échanges entre la mer et la lagune de Biguglia : Utilisation de la méthode d’estimation des volumes d’eau échangés entre la mer et les lagunes par différence de hauteurs d’eau. ArchiMer
Tunin-ley, Alina; Malet, Nathalie; Fiandrino, Annie; Orsoni, Valerie; Baldi, Yoann.
Le projet a pour objectif premier de disposer d'un modèle hydrodynamique opérationnel (modèle MARS) sur la lagune de Biguglia et de le valider sur la base de paramètres mesurés in situ (hauteurs d'eau, salinité, température, débits échangés avec la mer). Cela permettra ensuite de caractériser le fonctionnement physique de la lagune à l'aide de descripteurs hydrodynamiques (influence relative des différents forçages, temps de résidences...) puis d'en dégager une typologie saisonnière. Cette étude préliminaire a pour but d’estimer les volumes journaliers entrants et sortants à partir des données de hauteurs d’eau de part et d’autre des graus. Cette étude a été menée sur la lagune de Biguglia grâce à la méthode développée au LER-LR sur différents étangs du...
Tipo: Text Palavras-chave: Echanges mer/lagune; Hauteur d’eau; Grau; Hydrodynamique; Biguglia (lagune Corse).
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00214/32525/31011.pdf
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Dynamique des sédiments fins et mixtes des zones intertidales de la baie de Marennes-Oléron ArchiMer
Kervella, Stephane.
This thesis aims at increasing the general knowledge on sediment dynamics of intertidal flats in the Marennes-Oléron Bay, according to physical, biological and anthropogenic factors. The conducted research is compound of three complementary studies: (1) a study of sediment behaviour through applied rheophysics on intertidal superficial sediments; (2) a hydro-sedimentary study based on identification of the forcing action (physical, biological or anthropogenic) on the intertidal flat stability over several time scales (from the event to several months); (3) a specific application of the model SiAM-2DH to the Marennes-Oléron Bay. The surface sediments shows a mechanical behaviour that mainly depends on the fine fraction for a composition that contains up...
Tipo: Text Palavras-chave: Rhéophysique; Seuil d’écoulement; Sédiments cohésifs et mixtes; Sédimentation; Érosion; Hydrodynamique; Vasière; Zone intertidale; Conchyliculture; ALTUS; SiAM-2DH; Baie de Marennes-Oléron; Rhéophysics; Shear strenght; Cohesive and mixed sediment; Sédimentation; Erosion; Hydrodynamics; Mudflat; Intertidal area; Oyster; ALTUS; SiAM-2DH; Marennes-Oléron Bay..
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00004/11534/8117.pdf
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Modélisation du devenir à moyen terme dans l'eau et le sédiment des éléments majeurs (N, P, Si) rejetés par la Seine en Baie de Seine ArchiMer
Cugier, Philippe.
The Bay of Seine is a coastal ecosystem submitted to a large river input (Seine river), which brings important quantities of nutrients. This nutrient enrichment leads to frequent eutrophication events and, from the beginning of the eighties, regular toxic phytoplanktonic (Dynophysis) blooms are observed. In order to study the nutrient cycles (nitrogen, phosphorus, silica) and their contribution to phytoplanktonic stock regulation, a three dimensional model has been developed, based on the coupling between an hydrodynamic part taking into account sediment dynamics (SAM-3D) and an ecological part, which accounts for the main biological compartments and processes. This model is able to reproduce the main physical and biological characteristics of the...
Tipo: Text Palavras-chave: Bay of Seine (France); Dinoflagellates; Nutrients; Nutrients; Eutrophication; Sediments; Hydrodynamic; Mathematical models; Baie de (France); Seine; Dinoflagellés; Diatomées; Nutriments; Eutrophisation; Sédiments (géologie); Hydrodynamique; Modèles mathématiques.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/these-3220.pdf
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Rapport de mesures dans le lagon de Hienghène-Touho - Province Nord - Nouvelle-Calédonie. SPHYNX - Suivi des Paysages HYdrologiques des lagons Nord ArchiMer
Le Gendre, Romain; Soulard, Benoit; Lemonnier, Hugues; Laugier, Thierry; Hubert, Morgane; Desclaux, Terence; Royer, Florence; Le Tesson, Eric; Dumas, Franck; Kayara, Jean-françois.
Ce rapport fait partie du projet de recherche PRESENCE (PRessions sur les Ecosystèmes récifaux et lagonaires de Nouvelle-CalédoniE). L'objectif de ce projet est de mieux appréhender le fonctionnement des lagons de Nouvelle-Calédonie à partir d’observations in-situ, de télédétection et de modélisation hydrodynamique. Ce rapport présente les mesures effectuées sur les lagons de Touho à Pouébo situés sur la côte Est de la Province Nord de Nouvelle-Calédonie, secteur sur lequel les connaissances et observations du fonctionnement hydrodynamique étaient assez parcellaires. Les données seront utilisées par la suite pour mieux appréhender la dynamique de ce grand lagon mais également à des fins de calibration et de validation de modèle...
Tipo: Text Palavras-chave: Mesures; Hydrologie; Courantologie; Hydrodynamique; Hienghène; Hyehen; Pouébo; Pweevo; Modélisation.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00452/56378/58028.pdf
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Projet Grand Barachois : Rapport de mission Ifremer Miquelon 2016 ArchiMer
Le Moine, Olivier; Robert, Stephane; Geairon, Philippe.
La dynamique des masses d'eau et les flux transitant paraissent favoriser un comblement et/ou des limitations de renouvellement d'eau mettant en péril la durabilité de l’environnement de cette lagune Miquelonnaise. La Préfecture de Saint Pierre et la DTAM, en soutien à la gestion durable de cet environnement ont sollicité l’Ifremer pour l’évaluation des flux d’alimentation de cette lagune. Une mission sur place a été faite, pour coordonner les actions, et réaliser un certain nombre de mesures préliminaires (jaugeages et bathymétrie du chenal, Courantométrie horizontale).
Tipo: Text Palavras-chave: Hydrodynamique; Renouvellements; Saint-Pierre et Miquelon.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00358/46946/46853.pdf
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Study of the manoeuvrability and security of a trawl gear ArchiMer
Marichal, Dominique; Vincent, Benoit.
A complete method is presented for determining the static and dynamic behaviour of a fishing gear. The net, which is very flexible, is modelised by a set of rigid bars. The hydrodynamic forces, applied to each bar, are determined by combining and generalizing the Landweber and Morison hypothesis. A CFD method is used to calculate the forces on trawl doors. The fundamental principle of dynamics is completed with length equations expressing the elasticity of the bars. It leads to a set of second order non-linear differential equations, which is solved using a Runge-Kutta method. We will now present a few examples of the various applications of our works : the study of the trawl gear equilibrium in a uniform flow, an example of manoeuvrability (gyration of...
Tipo: Text Palavras-chave: Runge Kutta; Elasticity; Simulation; Model; Trawl doors; Hydrodynamic; Fishing gear; Runge Kutta; Elasticite; Simulation; Modèle; Panneaux de chalut; Hydrodynamique; Engin de pêche.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/acte-4612.pdf
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Modèle CROCO. Coastal and Regional Ocean Community model. Mise en oeuvre et performances pour les configurations côtières ArchiMer
Heyraud, Catherine.
Les performances du modèle communautaire CROCO sont évaluées grâce à un jeu de données in-situ complet (courant, hauteur d’eau, température, salinité) et comparées à celles du modèle MARS-3D. Il apparaît que les modèles ont un comportement hydro-dynamique proche avec des divergences liées au coeur numérique de CROCO (schéma temporel, schéma d’advection). A ce stade, ces divergences n’apparaissent pas discriminantes pour CROCO.
Tipo: Text Palavras-chave: CROCO; MARS; Hydrodynamique; Validation.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00470/58158/60657.pdf
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General hydrodynamical features in the ligurian sea inferred from the dyome experiment ArchiMer
Taupier-letage, Isabelle; Millot, Claude.
Tipo: Text Palavras-chave: Hydrodynamique; Mer Ligure; Circulation générale; Moyenne échelle; Variabilité; Hydrodynamics; Ligurian Sea; General circulation; Mesoscale; Variability.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/00110/22125/19761.pdf
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Modélisation du transport particulaire dans le Golfe du Lion en vue d'une application au devenir des traceurs radioactifs issus du Rhône ArchiMer
Dufois, Francois.
Among the contaminants introduced into the environment, the artificial radionuclides appear particularly important to take into account because of their chemical toxicity and/or of their radiotoxicity. Some radionuclides present a high affinity with particles so that the study of the sediment dynamics is a useful preliminary to the study of their dispersion on the open sea. This thesis is focused on the fate of sediments in the Gulf of Lions (NW Mediterranean) and in particular on the impact of the Rhone River, which is the main source of particulate matter in the Gulf of Lions. In order to study the sediment transport mechanisms on various space and time scales, this thesis is based on mathematical modelling. The hydro-sedimentary model set up in the Gulf...
Tipo: Text Palavras-chave: Waves; MARS 3D; Hydrodynamic; Radionuclides; Modelling; Sediment; Rhône prodelta; Gulf of Lions; Vagues; MARS 3D; Hydrodynamique; Radioéléments; Modélisation; Sédiment; Prodelta du Rhône; Golfe du Lion.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-6308.pdf
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Modelling of circulation and dispersion of radioactive pollutants in the Japan Sea ArchiMer
Cetina, Matjaz; Rajar, Rudi; Povinec, Pavel.
A large amount of radioactive waste was deposited in the Japan Sea, at a depth of about 3 000 m by the former Soviet Union. Research was carried out to determine to what extent the surface waters could be contaminated by possible leakage from the dumped containers. A three-dimensional, non-linear, baroclinic model was used to determine the circulation and pollutant dispersion. The computations were carried out in the diagnostic mode, taking into account data on winter and summer temperature and salinity distribution. Thermohaline forcing due to strong temperatures and salinity gradients is the main forcing factor influencing the bottom circulation. Wind forcing and the inflow/outflow surface currents were also taken into account. The simulated velocity...
Tipo: Text Palavras-chave: Hydrodynamique; Modélisation 3D; Pollution radioactive; Mer du Japon; Hydrodynamic; 3D modelling; Radioactive pollution; Japan Sea.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00323/43378/42833.pdf
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Accumulation des sels nutritifs dans un sédiment lagunaire et environnement hydrodynamique ArchiMer
Gomez, E; Millet, B; Picot, B.
The Mejean-Perols Lagoon is situated on the French Mediterranean coast. It is a small (747 ha) and shallow (70 cm) lagoon. Some treated effluent from Montpellier flows into this hypereutrophic lagoon. The cartography of C, N and P concentrations in the sediment was studied based on 35 bottom samples. The nitrogen and organic carbon concentrations were more or less homogeneous, the highest concentrations being found in the middle of the lagoon. The phosphate was principally bound onto the sediment in the west zone. The observed distribution was independent of grain size, the distribution of which was rather homogeneous. In this lagoon water circulation is wind induced. Four different water flow structures were observed, as functions of the prevailing winds...
Tipo: Text Palavras-chave: Sédiment; Lagune côtière; Hydrodynamique; Sels nutritifs; Carbone; Sediment; Coastal lagoon; Hydrodynamics; Nutrients; Carbon.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43642/43247.pdf
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Rapport 2018 Ifremer. Evolution des lagunes de Saint Pierre et Miquelon. Dynamique de renouvellement des masses d’eaux du Grand Barachois ArchiMer
Le Moine, Olivier; Geairon, Philippe; Robert, Stephane; Coudray, Sylvain; Fiandrino, Annie; Goraguer, Herle; Goulletquer, Philippe.
La dynamique des masses d'eaux et les flux de transit semble favoriser un comblement et/ou des limitations de renouvellement d'eau mettant en péril la durabilité de l’environnement de cette lagune Miquelonnaise. La Préfecture de Saint Pierre et Miquelon et la DTAM, en soutien à la gestion durable de cet environnement, ont sollicité l’Ifremer pour l’évaluation des flux d’alimentation de cette lagune. Une mission sur place a été réalisée en juin 2016 afin de coordonner les actions et effectuer les mesures préliminaires portant sur les jaugeages, la bathymétrie du chenal et la courantométrie horizontale. Ces données ont ensuite été complétées par une acquisition continue des vitesses de courant, avec des données disponibles du 2 juin au 15 novembre 2016, puis...
Tipo: Text Palavras-chave: Hydrodynamique; Renouvellements; Saint Pierre et Miquelon; Lagune; Grand Barachois; Hydrodynamic; Renewal rates; Saint Pierre et Miquelon; Lagoon; Grand Barachois.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00478/58974/61587.pdf
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Rejets urbains. Volet Manche - Atlantique - Site de Morlaix - Etudes sédimentologique et Bathymétrique de l' estuaire de Morlaix ArchiMer
Bassoullet, Philippe; L'Yavanc, Jacky; Guillaud, Jean-francois; Loarer, Ronan; Breton, Marguerite.
In order to increase our knowledge about sediment transport in the bay and maritime part of the River of Morlaix (Finistère), measurernènts have been perforrned on site. This report gives the granulometrical and physical parameters of the sediments as weIl as the hydrodynamics, used for a model of particulate transport in the area. The rnodel and its application will be published later
Tipo: Text Palavras-chave: Rejet urbain; Sédiment; Granulométrie; Hydrodynamique; Modèle de transport particulaire; Sable; Vase; Estuaire de Morlaix.; Urban wastes; Model; Sediment; Granulometry; Hydrodynamics; Sand; Mud; Sedimentary transport model; Morlaix estuary.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/00345/45658/45293.pdf
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Barge pour environnements type Bresil : essais en bassin ArchiMer
Le Boulluec, Marc; Maisondieu, Christophe; Du Plessix, Guillaume; Cordeau, Cyril.
drilling capability designed by SAIPEM for oil production offshore Brazil or area with equivalent environmental conditions. A central moon-pool is surrounded by a system of walls and columns above an immersed pontoon. An upper deck is situated above the water line. Sea water can flow between walls and columns above the pontoon. The aim of wave tank experiments is to validate the preliminary sea keeping calculations and study the free surface effects inside the moon-pool and above the pontoon.
Tipo: Text Palavras-chave: Hydrodynamique; Essais en bassin; Houle; Surélévations; Diffraction; Radiation; Moon-pool.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/00170/28169/26403.pdf
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Etude expérimentale pour l'optimisation des performances d'une plage d'amortissement parabolique ArchiMer
Le Boulluec, Marc; Kimmoun, Olivier; Molin, Bernard.
An optimisation study was run before rebuilding the damping beach of the Ifremer Ocean Engineering Basin. Trials were conducted at a ¼ geometrical scale at Ecole Centrale de Marseille in a wave tank reproducing the original performance of the beach. A series of modifications was studied : incidence, device between the beach and the adjacent wall, porosity. Porosity was shown as the most efficient tool to enhance the beach absorption and full scale measurements revealed that the resulting damping coefficient was less than 10 % for all usual periods and amplitudes.
Tipo: Text Palavras-chave: Hydrodynamique; Essais en bassin; Houle; Réflexion; Amortissement; Plage; Hydrodynamics; Wave tank testing; Reflection; Damping beach.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/00170/28170/26404.pdf
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Etude du fonctionnement hydrosédimentaire d'un écosystème lagunaire sur des échelles de temps multiples. Application au complexe lagunaire "étangs Palavasiens - étang de l'Or - canal du Rhône à Sète" ArchiMer
Castaings, Jerome.
The sedimentary evolution of coastal lagoons is a complex phenomenon involving both short term extreme processes (floods, storms) and long term processes (mean sea level variations, climate change). If general mechanisms of these phenomena are well known, their spatial and temporal variability makes them difficult to assess at the local scale. The diversity of lagoonal environments and human influence makes this even more risky. I have focussed this study on the case of a Mediterranean lagoon system : “Palavasian lagoons, Or lagoon, and Rhône-Sète waterway” which is located in the Gulf of Lion (South of France). A ultidisciplinary approach was used to assess sediment dynamics on multiple time scales. An average filling rate of 1.3 mm.year-1 over the two...
Tipo: Text Palavras-chave: Dynamique sédimentaire; Géochronologie; Hydrodynamique; Échelles temporelles; Lagunes; Sediment dynamic; Geochronology; Hydrodynamic; Time scales; Lagoons.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00193/30436/28853.pdf
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