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Registros recuperados: 34
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3D modelling of summer hypoxia in a highly turbid urbanized macrotidal estuary, coupling hydrodynamics, sediment transport and biogeochemical processes ArchiMer
Lajaunie Salla, Katixa; Sottolichio, Aldo; Thouvenin, Benedicte; Litrico, Xavier; Abril, Gwenael.
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00292/40302/38751.pdf
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Accumulation and dispersion dynamics of mud and sand particles in a continental shelf under estuarine influence: a numerical modelling analysis (Gironde, France) ArchiMer
Diaz, Melanie; Grasso, Florent; Le Hir, Pierre; Caillaud, Matthieu; Thouvenin, Benedicte.
Coastal environments are directly influenced by terrigenous inputs coming from rivers through estuaries. Quantifying the amount of nutrients and contaminants brought by sediments from continental areas to the sea is of major interest for marine resource protection. The complexity of the intra-estuarine dynamics, associated with the strong variability of meteorological forcing makes it difficult to quantify the residence time of particles within the estuary and the accumulation and dispersion areas offshore the mouth. Moreover, the dynamics of fine sediment trapping areas in the adjacent continental shelf (e.g. temporary or permanent storage such as the “West-Gironde Mud Patch” (WGMP) ) remains extremely challenging to address. Based on a realistic...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00514/62559/66913.pdf
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Amélioration de la gestion des conditions de frontières ouvertes biogéochimiques dans les modèles physiques et biogéochimiques couplés régionaux afin de reproduire les principaux processus d’échanges côte - large. Action vers une Modélisation Intégrée Côtière Opérationnelle (AMICO). ArchiMer
Pinazo, Christel; Ross, Oliver; Diaz, F.; Doglioli, A.m.; D'Ortenzio, F.; Estournel, C.; Forget, P.; Garnier, Valerie; Gutknecht, E.; Kersale, M.; Kessouri, F.; Lathuilière, C.; Marie, Louis; Marmain, J.; Marsaleix, P.; Perruche, C.; Petrenko, A.; Reffray, G.; Sourisseau, Marc; Taillandier, V.; Taupier-letage, I.; Testor, P.; Thouvenin, Benedicte; Ulses, C.; Eldin, G..
Tipo: Text
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00292/40336/41772.pdf
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Baie de Vilaine - Oxymor 1983 - Modèle mathématique vertical - Evolution de l'oxygène dissous au fond ArchiMer
Thouvenin, Benedicte.
Une série de campagnes a été effectuée pendant l'été 1983 en baie de VILAINE afin d'étudier les phénomènes d'anoxie au niveau du fond. Un point de mesure "OXYMOR" a été choisi pour suivre l'evolution de l'oxygène au fond en même temps que la température sur la verticale, les courants et la salinité au fond et en surface.
Tipo: Text
Ano: 1984 URL: http://archimer.ifremer.fr/doc/00081/19210/16805.pdf
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Behaviour and fate of urban particles in coastal waters: Settling rate, size distribution and metals contamination characterization ArchiMer
Oursel, B.; Garnier, C.; Pairaud, Ivane; Omanovic, D.; Durrieu, G.; Syakti, A. D.; Le Poupon, C.; Thouvenin, Benedicte; Lucas, Y..
The evaluation of contaminant net fluxes from the coast to the open sea requires the study of terrigeneous particles behaviour and fate. We studied the particles issued from two small coastal rivers whose waters are mixed with treated wastewater (TWW) coming from the Marseille wastewater treatment plant (WWTP) just before discharge to the Mediterranean Sea. An experimental device was developed and used to investigate particles settling rates, size distribution and metallic contamination when mixing with seawater. The particles were sampled in flood deposits of rivers and outlets during rainy periods and in the outlet water during dry periods. The flood deposits were mainly composed of 50–200 μm-sized particles, higher metals content being observed in the...
Tipo: Text Palavras-chave: Particles contamination; Urban rivers; Coastal zone; TWW; Hydro sedimentation modelling.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00169/28066/27277.pdf
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Contribution of modeling to the knowledge of trace elements behaviour and speciation in estuaries ArchiMer
Gonzalez, Jean-louis; Dange, Catherine; Thouvenin, Benedicte.
Geochemical models are excellent tools for the understanding of trace elements dynamics, in particular in complex environments like estuaries. Their aim is to reproduce numerically the biogeochemical processes observed in the field or laboratory. The development and the use of this kind of tool requires: - in-situ data on the distribution in space and time of the elements studied and relationship with the environmental variables. - experimental data (mainly based on the use of radioactive analogues of the studied elements) for evaluation of model parameters and the validation of model assumptions. The model must be capable not only of reproducing the distribution of metals between the dissolved and particulate phases, but also of evaluating the...
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Ano: 2002 URL: https://archimer.ifremer.fr/doc/00479/59099/61737.pdf
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Cycle annuel de mesures physiques dans le milieu récepteur marin. Mouillage T.O. dans la grande rade de Toulon. Programme rejets urbains. Volet Méditerranée ArchiMer
Thouvenin, Benedicte; Romana, L. A.; Loarer, Ronan; Joly, R..
This report is a compilation of current, wind, temperature and salinity measurements carried out during one and a half years, in the bay of Toulon, near the Sainte Marguerite sea outfall.
Tipo: Text Palavras-chave: Mesures; Courants; Température; Salinité; Météorologie; Toulon; Méditerranée; Measurements; Currents; Temperature; Salinity; Meteorology; Toulon; Mediterranean sea.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00432/54351/58914.pdf
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Ecological model of the Bay of Biscay and English Channel shelf for Environmental Status assessment Part 1: Nutrients, phytoplankton and oxygen ArchiMer
Menesguen, Alain; Dussauze, Morgan; Dumas, Franck; Thouvenin, Benedicte; Garnier, Valerie; Lecornu, Fabrice; Repecaud, Michel.
European directives (Water Framework Directive - WFD and Marine Strategy Framework Directive - MSFD) require a regular survey of several descriptors of the Environmental Status of coastal waters of the North-east Atlantic Ocean. Especially for the MSFD, which may concern large continental shelf areas where measurements are scarce, realistic ecological models can help assessing the Environmental Status. The ECO-MARS3D model of the pelagic ecosystem of the Bay of Biscay and English Channel continental shelf (NE Atlantic) has been developed for these applied purposes and validated against various types of historic data. This first paper deals with the basic biogeochemical version, which contains inorganic nutrients (NH4, NO3, PO4, Si(OH)4), three...
Tipo: Text Palavras-chave: Ecological 3D model; Continental shelf; Bay of Biscay and English Channel; Surface chlorophyll; Dissolved oxygen; MSFD.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00469/58098/60510.pdf
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EMOSEM Final Report - Ecosystem Models as Support to Eutrophication Management In the North Atlantic Ocean ArchiMer
Desmit, Xavier; Lacroix, Geneviève; Thieu, Vincent; Menesguen, Alain; Dulière, Valerie; Campuzano, Francisco; Billen, Gilles; Neves, Ramiro; Lancelot, Christiane; Gypens, Nathalie; Dussauze, Morgan; Garnier, Josette; Silvestre, Marie; Passy, Paul; Lassaletta, Luis; Guittard, Gabriel; Théry, Sylvain; Thouvenin, Benedicte; Garcia, Carla; Pinto, Ligia; Sobrinho, Joao; Mateus, Marco; Ascione Kenov, Isabella.
One of the leading challenges in marine science and governance is to improve scientific guidance of management measures to mitigate eutrophication nuisances in the EU seas. Too few approaches integrate the eutrophication process in space (continuum river-ocean) and in time (past, present and future status). A strong need remains for (i) knowledge/identification of all the processes that control eutrophication and its consequences, (ii) consistent and harmonized reference levels assigned to each eutrophication-related indicator, (iii) identification of the main rivers directly or indirectly responsible for eutrophication nuisances in specific areas, (iv) an integrated transboundary approach and (v) realistic short term and long term nutrient reduction...
Tipo: Text
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00292/40301/38750.pdf
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How to avoid eutrophication in coastal seas? A new approach to derive river-specific combined nitrate and phosphate maximum concentrations ArchiMer
Menesguen, Alain; Desmit, Xavier; Duliere, Valerie; Lacroix, Genevieve; Thouvenin, Benedicte; Thieu, Vincent; Dussauze, Morgan.
Since 1950, increase in nitrogen (N) and phosphorus (P) river loadings in the North-East Atlantic (NEA) continental seas has induced a deep change in the marine coastal ecosystems, leading to eutrophication symptoms in some areas. In order to recover a Good Ecological Status (GES) in the NEA, as required by European Water Framework Directive (WFD) and Marine Strategy Framework Directive (MSFD), reductions in N- and P-river loadings are necessary but they need to be minimal due to their economic impact on the farming industry. In the frame of the “EMoSEM” European project, we used two marine 3D ecological models (ECO-MARS3D, MIRO&CO) covering the Bay of Biscay, the English Channel and the southern North Sea to estimate the contributions of various...
Tipo: Text Palavras-chave: Marine eutrophication; Ecosystem modelling; Nutrient reduction scenario; Linear optimization; Good ecological status; EU policies.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00426/53774/54661.pdf
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Impact of urban effluents on summer hypoxia in the highly turbid Gironde Estuary, applying a 3D model coupling hydrodynamics, sediment transport and biogeochemical processes ArchiMer
Lajaunie-salla, Katixa; Wild-allen, Karen; Sottolichio, Aldo; Thouvenin, Benedicte; Litrico, Xavier; Abril, Gwenael.
Estuaries are increasingly degraded due to coastal urban development and are prone to hypoxia problems. The macro-tidal Gironde Estuary is characterized by a highly concentrated turbidity maximum zone (TMZ). Field observations show that hypoxia occurs in summer in the TMZ at low river flow and a few days after the spring tide peak. In situ data highlight lower dissolved oxygen (DO) concentrations around the city of Bordeaux, located in the upper estuary. Interactions between multiple factors limit the understanding of the processes controlling the dynamics of hypoxia. A 3D biogeochemical model was developed, coupled with hydrodynamics and a sediment transport model, to assess the contribution of the TMZ and the impact of urban effluents through wastewater...
Tipo: Text Palavras-chave: Hypoxia; TMZ; Gironde Estuary; Wastewater; Oxygen; Modeling.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00388/49903/50475.pdf
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Influence des conditions hydrométéorologiques sur les flux et bilans sédimentaires en estuaire de Seine ArchiMer
Grasso, Florent; Schulz, Elisabeth; Le Hir, Pierre; Verney, Romaric; Thouvenin, Benedicte.
La dynamique sédimentaire à l’embouchure de l’estuaire de Seine est principalement contrôlée par les forçages hydrométéorologiques (débit, vent, vagues, marée) et les fortes pressions anthropiques (endiguement, dragage, clapage). La compréhension et la quantification de la dynamique des flux sédimentaires en suspension (sable/vase) est un enjeu majeur, autant d’un point vu écologique (ex. turbidité, envasement) que financier (ex. gestion des chenaux de navigation). La mise en place de réseaux de mesure in situ permet une meilleure compréhension de la dynamique sédimentaire de l’estuaire, mais leur caractère local rend difficile toute estimation des flux et bilans sédimentaires. Pour répondre à ces questions, cette étude s’appuie sur la modélisation...
Tipo: Text Palavras-chave: Dynamique hydro-sédimentaire; Sable/vase; Estuaire de Seine; Modélisation numérique; Mesures in situ; Dragage; Flux résiduels et bilans; Année/trimestres.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00348/45928/45621.pdf
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Influence du bouchon vaseux sur les variations des concentrations en oxygène dissous : Cas de l'estuaire de la Loire ArchiMer
Romana, Louis-alexandre; Thouvenin, Benedicte; Galenne, B.; Casanova, C..
The dissolved oxygen is a sensitive parameter for the environment quality. It is subjected to important variations in macrotidal estuaries with significant results on the fauna. It's why we can notice the important mullet death note in the Estuary of the Loire during sommer time. The supply of biodegradable organic substances in the maximum turbidity zone led to an important dissolved oxygen demand. It's the example of the Estuary of the Loire where we can watch this main fonction. A detailed study has begun on the dissolved oxygen cycle to compare the biochemical particulate and dissolved oxygen demand. This study collects in situ parameters, either of the environment evolution or of the dissolved oxygen cycle with specifie researches on the rate of...
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Ano: 1990 URL: https://archimer.ifremer.fr/doc/00480/59123/61751.pdf
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MASSILIA: Modélisation de la baie de MArSeILLe : Influence des apports Anthropiques de la métropole sur l’écosystème marin ArchiMer
Pinazo, Christel; Fraysse, Marion; Doglioli, Andrea; Faure, Vincent Martin; Pairaud, Ivane; Petrenko, Anne; Thouvenin, Benedicte; Tronczynski, Jacek; Verney, Romaric; Yohia, Christophe.
In the framework of sustainable development, the anthropogenic impact of large coastal cities on the marine ecosystem is a key issue. This project aimed to improve our knowledge in marine ecosystem response to the anthropogenic supplies (from rivers, sewage outflows and atmosphere) from large cities. In particular, the goal is to underline how the physical forcing decreases or increases the anthropogenic impact on the coastal ecosystem and the assessment of the chemical contaminant (PCB) inputs (from city to sea) and exports (from mid-sea to open sea).
Tipo: Text Palavras-chave: Apports anthropiques; Baie de Marseille; Méditerranée nord-occidentale; Modélisation 3D; MARS3D; ECO3M; Couplage physique et biogéochimique; Anthropogenic supply; Bay of Marseille; North-Western Mediterranean Sea; 3D modelling; MARS3D; ECO3M; Physical-biogeochemical coupling.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00145/25592/23739.pdf
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MASSILIA Project. Modelling of the Bay of Marseille : Impact of the Anthropogenic Supply on the marine coastal ecosystem ArchiMer
Pinazo, Christel; Doglioli, Andrea; Faure, Vincent; Fraysse, Marion; Ross, Oliver; Pairaud, Ivane; Petrenko, Anne; Thouvenin, Benedicte; Tronczynski, Jacek; Verney, Romaric; Yohia, Christophe.
Tipo: Text
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00292/40337/38857.pdf
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MENOR: a high-resolution (1.2 km) modeling of the North-Western Mediterranean Sea routinely run by the PREVIMER operational forecast system ArchiMer
Garnier, Valerie; Pairaud, Ivane; Nicolle, Amandine; Alekseenko, Elena; Baklouti, Melika; Thouvenin, Benedicte; Lecornu, Fabrice; Garreau, Pierre.
IFREMER has encouraged for over 15 years the oceanographic modeling of sea waters all around the metropolitan French coasts in order to facilitate environmental coastal studies. In that context, the North-Western Mediterranean Sea confi guration (MENOR: 1.2 km – 60 vertical levels) has been introduced in the framework of Previmer operational forecasting system (http://www.previmer.org/en). This article gives an insight into the operational applications and scientific research using this MENOR configuration.
Tipo: Text
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00204/31519/29936.pdf
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METROC : modélisation idéalisée de substances dissoutes et particulaires rejetées en rade de Marseille ArchiMer
Jany, Cassandre; Pairaud, Ivane; Thouvenin, Benedicte; Verney, Romaric.
In the context of the METROC project, academic modelling of dissolved and particulate materials were done with the MARS3D model. Considering the dissolved materials, we calculated evacuation times and residence times. Then, we add minimal dilution and percentile maps to assimilate the modelling and the realistic dissolved metal discharge. Considering the particulate materials, we did balance sheets for material exported, sedimenting or staying in water for three different phases (whole modelling 13 October – 31 December 2008, flood situation and resuspension situation). Maps of Marseille roadstead complete that information and allow visualising the principal deposition area. We will continue this work by modelling reel material such as Lead.
Tipo: Text
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00090/20088/17724.pdf
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Modèle mathémathique sur la nitrification et le cycle de l'oxygène dissous en estuaire de la Seine ArchiMer
Romana, Louis-alexandre; Thouvenin, Benedicte; Sammari, Cherif.
L'étude proposée dans ce document est basée sur l'application, dans l'estuaire de la Seine, d'un modèle unidimensionnel, non-stationnaire, reproduisant le cycle de l'oxygène dissous et les différents paramètres qui y contribuent. Le but est d'obtenir un outil fiable permettant de tester l'importance respective des phénomènes et de mettre en évidence les processus pour lesquels la communauté scientifique manque d'informations.
Tipo: Text
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00081/19228/16823.pdf
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Modele tridimensionnel de circulation et de dispersion ArchiMer
Thouvenin, Benedicte; Salomon, J.
Bottom topography, coastal morphology and density variations are the three factors influencing marine current flow in Seine Bay. Numerical modeling allows the study of this tridimensional structure.
Tipo: Text Palavras-chave: Hodographs; Salinity gradients; Coastal zone; Bottom topography; Mathematical models; Tidal currents; Dispersion; Water circulation.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1260.pdf
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Modèle tridimensionnel de circulation et de dispersion en zone côtière à marée. Premiers essais : cas schématique et baie de Seine ArchiMer
Thouvenin, Benedicte; Salomon, Jean-claude.
In order to reproduce and investigate the marine circulation in the coastal tidal zone, and especially its three dimensional nature, it appeared interesting to develop a numerical mode! which could take account of the real bottom topography and the variations of the free surface. Navier-Stokes equations are solved in a straight forward manner, generalizing a finite difference technique already used in two-dimensional vertical models. To test the computational program, the mode! was applied to a number of flat bottom schematic basins, where we reproduced wind driven currents and tide propagation. Then we considered the particular case of a real channel and, finally, density currents associated with a salty wall. Mode) results are compared to theoretical...
Tipo: Text Palavras-chave: Modèle; Courant; Tridimensionnel; Seine; Côtier; Model; Current; Three-dimensional; Seine; Coastal.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/00113/22440/20127.pdf
Registros recuperados: 34
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