Consulta: creatorFacets:"Thouvenin, Benedicte"
Registros recuperados: 37
Data/hora: 04/06/2024 04:47:57

Suspended Sediment Dynamics in the Macrotidal Seine Estuary (France) - Part 2: Numerical Modeling of Sediment Fluxes and Budgets Under Typical Hydrological and Meteorological Conditions
Provedor de dados: 5
Autores: Schulz, Elisabeth; Grasso, Florent; Le Hir, Pierre; Verney, Romaric; Thouvenin, Benedicte.
Understanding the sediment dynamics in an estuary is important for its morphodynamic and ecological assessment as well as, in case of an anthropogenically controlled system, for its maintenance. However, the quantification of sediment fluxes and budgets is extremely difficult from in-situ data and requires thoroughly validated numerical models. In the study presented here, sediment fluxes and budgets in the lower Seine Estuary were quantified and investigated from seasonal to annual time scales with respect to realistic hydro- and meteorological conditions. A realistic three-dimensional process-based hydro- and sediment-dynamic model was used to quantify mud and sand fluxes through characteristic estuarine cross-sections. In addition to a reference...
Tipo: Text
Palavras-chave: Macrotidal estuary; Sediment fluxes; Numerical modelling; Mud/sand; Wind/waves; River discharge.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00416/52772/53640.pdf

Modele tridimensionnel de circulation et de dispersion
Provedor de dados: 5
Autores: 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

Spéciation des contaminants métalliques en milieu estuarien : Intérêt de la modélisation et application au cadmium
Provedor de dados: 5
Autores: Gonzalez, Jean-louis; Dange, Catherine; Thouvenin, Benedicte.
In estuarine environment, cadmium has a nonconservative behavior. It can be present under various species: dissolved (mineral and organic complexes), colloidal and particulate forms (adsorbed, precipitated), or integrated by various mechanisms in the organisms. This distribution is the result of processes (physical, chemical and biological) which are controlled by many factors (salinity, pH, Eh, nature and concentration of suspended matter, primary production). Geochemical modeling is a very useful approach to understand the dynamics of this type of contaminant, especially in the complex systems which are the estuaries. A speciation model was used to simulate the measurements taken (dissolved and particulate Cd) during various cruises carried out in the...
Tipo: Text
Palavras-chave: Cadmium; Estuary; Speciation; Modeling; Surface complexation; Cadmium; Estuaire; Spéciation; Modélisation; Complexation de surface.
Ano: 2001
URL: https://archimer.ifremer.fr/doc/00480/59120/61749.pdf

METROC : modélisation idéalisée de substances dissoutes et particulaires rejetées en rade de Marseille
Provedor de dados: 5
Autores: 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

Cycle annuel de mesures physiques dans le milieu récepteur marin. Mouillage T.O. dans la grande rade de Toulon. Programme rejets urbains. Volet Méditerranée
Provedor de dados: 5
Autores: 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

Impact of urban effluents on summer hypoxia in the highly turbid Gironde Estuary, applying a 3D model coupling hydrodynamics, sediment transport and biogeochemical processes
Provedor de dados: 5
Autores: 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

Modelling Pb and Cd dynamics in the Seine estuary
Provedor de dados: 5
Autores: Thouvenin, Benedicte; Gonzalez, Jean-louis; Chiffoleau, Jean-francois; Boutier, Bernard; Le Hir, Pierre.
The Seine estuary (France) is currently one of the world's most contaminated estuaries, due in particular to its high cadmium and lead content. Proper understanding of contaminant transfer, transformation and retention mechanisms throughout the estuary and up to the adjacent marine zone require a range of studies involving data collections, experiments, and modeling tool. A multivariable transport model (SiAM-3D) was used to simulate dissolved and particulate transport and it is applied to several calculation grids; a speciation model (MOCO) was used to select key species and obtain a schematic system representation. The coupled model for Cd and Pb was compared with field measurements. The complementary character of various tools (model applied to annual...
Tipo: Text
Palavras-chave: 3D modeling; Cd and Pb trace metals; Seine estuary.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3009.pdf

Phytoplankton versus macrophyte contribution to primary production and biogeochemical cycles of a coastal mesotidal system. A modelling approach
Provedor de dados: 5
Autores: Plus, Martin; Auby, Isabelle; Maurer, Daniele; Trut, Gilles; Del Amo, Y.; Dumas, Franck; Thouvenin, Benedicte.
This study presents an assessment of the contributions of various primary producers to the global annual production and N/P cycles of a coastal system, namely the Arcachon Bay, by means of a numerical model. This 3D model fully couples hydrodynamic with ecological processes and simulates nitrogen, silicon and phosphorus cycles as well as phytoplankton, macroalgae and seagrasses. Total annual production rates for the different components were calculated for different years (2005, 2007 and 2009) during a time period of drastic reduction in seagrass beds since 2005. The total demand of nitrogen and phosphorus was also calculated and discussed with regards to the riverine inputs. Moreover, this study presents the first estimation of particulate organic carbon...
Tipo: Text
Palavras-chave: Primary production; Macrophyte; Phytoplankton; Biogeochemical cycle; Physical-ecological coupled model; Arcachon bay.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00278/38963/37503.pdf

Influence des conditions hydrométéorologiques sur les flux et bilans sédimentaires en estuaire de Seine
Provedor de dados: 5
Autores: 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

How to avoid eutrophication in coastal seas? A new approach to derive river-specific combined nitrate and phosphate maximum concentrations
Provedor de dados: 5
Autores: 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&amp;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

Modélisation mathématique de l'oxygène dissous dans l'estuaire de la Loire. Première phase
Provedor de dados: 5
Autores: Thouvenin, Benedicte; Romana, Louis-alexandre.
Depuis plusieurs années, on observe en période post-estivale un très important déficit en oxygène dissous dans l'estuaire de la Loire, accompagné par une mortalité élevée de certaines espèces halieutiques migratrices. L'origine de cette anoxie est imputée au stock de matière organique particulaire biodégradable qui est piégée dans la zone de turbidité maximale. A la demande de l'Association pour la Protection de l'Environnement de l'Estuaire de la Loire, un modèle mathématique a été mis en place pour décrire les mécanismes hydrodynamiques et hydrosédimenraires dans l'estuaire, ainsi que l'évolution de l'oxygène dissous et la dégradation de la matière organique. Dans une première phase, ce modèle reproduit l'évolution longitudinale et temporelle de...
Tipo: Text
Palavras-chave: Modèle mathématique; Estuaire; Loire; Oxygène dissous; Matière organique.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/00439/55039/56471.pdf

Transport et mélange d'un rejet urbain dans le milieu marin - Mer Méditerranée
Provedor de dados: 5
Autores: Thouvenin, Benedicte.
Dans le cadre du programme national "REJETS URBAINS EN MER", développé par l'IFREMER, en collaboration avec l'Agence de Bassin Rhône Méditerranée Corse, des études sur le comportement d'un effluent émis par un émissaire en profondeur ont été réalisées. Complétant des mesures courantométriques et hydrologiques de longue durée, en un point à la sortie de l'émissaire de TOULON EST, deux modèles mathématiques ont été appliqués pour reproduire et étudier le rejet pendant les deux étapes de dilution. · Le modèle JET, développé par la SOGREAH, a été testé et comparé avec des mesures in situ. Les variations des résultats en fonction des conditions du milieu rencontrées pendant un cycle annuel ont été étudiées. Un modèle de transport et mélange multicouches a été...
Tipo: Text
Palavras-chave: Rejet urbain; Modèle mathématique; Rade de Toulon; Dispersion; Contamination.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/00132/24287/22285.pdf

EMOSEM Final Report - Ecosystem Models as Support to Eutrophication Management In the North Atlantic Ocean
Provedor de dados: 5
Autores: 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

Behaviour and fate of urban particles in coastal waters: Settling rate, size distribution and metals contamination characterization
Provedor de dados: 5
Autores: 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

Baie de Vilaine - Oxymor 1983 - Modèle mathématique vertical - Evolution de l'oxygène dissous au fond
Provedor de dados: 5
Autores: 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

Influence du bouchon vaseux sur les variations des concentrations en oxygène dissous : Cas de l'estuaire de la Loire
Provedor de dados: 5
Autores: 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...
Tipo: Text
Ano: 1990
URL: https://archimer.ifremer.fr/doc/00480/59123/61751.pdf

3D modelling of summer hypoxia in a highly turbid urbanized macrotidal estuary, coupling hydrodynamics, sediment transport and biogeochemical processes
Provedor de dados: 5
Autores: Lajaunie Salla, Katixa; Sottolichio, Aldo; Thouvenin, Benedicte; Litrico, Xavier; Abril, Gwenael.
Tipo: Text
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00292/40302/38751.pdf

Modélisation environnementale de l'estuaire de la Seine
Provedor de dados: 5
Autores: Bacq, Nicolas; Cugier, Philippe; Grasso, Florent; Le Gendre, Romain; Le Hir, Pierre; Lemoine, Jean-philippe; Riou, Philippe; Schulz, Elisabeth; Thouvenin, Benedicte; Verney, Romaric.
Dans le cadre du programme de recherche Seine-Aval 5, différentes stratégies de modélisation numérique sont mises en place pour aider à répondre aux questionnements scientifiques et sociétaux associés au fonctionnement physique, biologique, chimique et écologique de l'estuaire de la Seine (ex. projets RESET et HYMOSED). Les forçages météo-marins (vent, vague, marée) et hydrologique (débit) contrôlent le fonctionnement hydro-morpho-sédimentaire et biogéochimique de l'estuaire, modifiant ainsi les paramètres environnementaux de l’estuaire amont jusqu’à la baie de Seine (ex. nature des fonds, courant, turbidité, salinité, température, oxygène dissous, chlorophylle-a). La modélisation de ces paramètres, ainsi que leur évolution face à différents scénarios...
Tipo: Text
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00284/39480/37966.pdf

MENOR: a high-resolution (1.2 km) modeling of the North-Western Mediterranean Sea routinely run by the PREVIMER operational forecast system
Provedor de dados: 5
Autores: 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

Accumulation and dispersion dynamics of mud and sand particles in a continental shelf under estuarine influence: a numerical modelling analysis (Gironde, France)
Provedor de dados: 5
Autores: 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...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00514/62559/66913.pdf

Modeling mud and sand transfers between a macrotidal estuary and the continental shelf: influence of the sediment-transport parameterization
Provedor de dados: 5
Autores: Diaz, Melanie; Grasso, Florent; Le Hir, Pierre; Sottolichio, Aldo; Caillaud, Matthieu; Thouvenin, Benedicte.
Coastal environments are directly influenced by terrigenous inputs coming from rivers through estuaries. Quantifying the amount of nutrients and contaminants transported by sediments from continental areas to the sea is crucial for marine resources protection. However, the complexity of estuarine dynamics makes it difficult to quantify sediment fluxes from field measurements alone and requires numerical modeling. Thus, using a realistic 3D hydrodynamic and sediment transport model, this study aims at evaluating the influence of model empirical parameters on sediment fluxes and estimating uncertainties on mud and sand transfers at a macrotidal estuary mouth. A sensitivity analysis, considering changes in sediment transport parameters, revealed that the...
Tipo: Text
Palavras-chave: Sensitivity analysis; Sediment fluxes; Numerical modeling; Mud; Sand; Gironde Estuary.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00617/72897/71906.pdf

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).
Provedor de dados: 5
Autores: 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

Modèle tridimensionnel de circulation et de dispersion en zone côtière à marée. Premiers essais : cas schématique et baie de Seine
Provedor de dados: 5
Autores: 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

Contribution of modeling to the knowledge of trace elements behaviour and speciation in estuaries
Provedor de dados: 5
Autores: 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...
Tipo: Text
Ano: 2002
URL: https://archimer.ifremer.fr/doc/00479/59099/61737.pdf

Ecological model of the Bay of Biscay and English Channel shelf for Environmental Status assessment Part 1: Nutrients, phytoplankton and oxygen
Provedor de dados: 5
Autores: 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

Operational modelling of nutrients and phytoplancton in the bay of biscay and english channel
Provedor de dados: 5
Autores: Menesguen, Alain; Dussauze, Morgan; Lecornu, Fabrice; Dumas, Franck; Thouvenin, Benedicte.
Nitrate loadings to the French coastal waters of the Bay of Biscay and the English Channel have increased from 5 to 10 times during the four last decades, due to runoff on intensively fertilized agricultural watersheds. Eutrophication of this coastal zone is now a recurrent problem, with wellknown direct impacts (Ulva “green tides” on beaches, excessive phytoplanktonic blooms responsible for “coloured waters” and bottom hypoxia events offshore), but also indirect enhancement of the toxicity of some phytoplankton species, caused for instance by increased N:Si ratio in the coastal sea. In order to better guide the decision makers about nutrient loading reduction, Ifremer uses the so-called ECO-MARS3D biogeochemicalhydrodynamical model to simulate the present...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00197/30797/29166.pdf

MASSILIA: Modélisation de la baie de MArSeILLe : Influence des apports Anthropiques de la métropole sur l’écosystème marin
Provedor de dados: 5
Autores: 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

Modélisation des contaminants en milieu aquatique: Module MET&amp;OR
Provedor de dados: 5
Autores: Thouvenin, Benedicte.
The MET&amp;OR module is a model, written in FORTRAN 90, which calculates the biogeochemical reactions between variables such as trace metal, radioactive tracers, organic or bacterial contaminants (biodegradation, decay, adsorption / desorption, photolysis, hydrolysis, volatilization, partition at equilibrium ..). It groups together classical reactions, described in the literature, to evaluate the source and sink terms which are integrated into the transport equations solved by a hydrodynamic model. It is intended more particularly for marine and coastal waters. This technical documentation aims to present the MET&amp;OR module and the way in which it was coupled to the hydrodynamic model, in particular to MARS-3D.
Tipo: Text
Palavras-chave: Modelisation; Biogéochimie; Contaminants métalliques; Organic contmainants; Contaminants bactériens; Modeling; Biogeochemical; Trace metals; Contaminants organiques; Bacterial contaminant.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00688/79972/83002.pdf

Suspended Sediment Dynamics in the Macrotidal Seine Estuary (France) - Part 1: Numerical Modeling of Turbidity Maximum Dynamics
Provedor de dados: 5
Autores: Grasso, Florent; Verney, Romaric; Le Hir, Pierre; Thouvenin, Benedicte; Schulz, Elisabeth; Kervella, Youenn; Fard, I. Khojasteh Pour; Lemoine, J. -p.; Dumas, Franck; Garnier, Valerie.
Tidal pumping, baroclinic circulation and vertical mixing are known to be the main mechanisms responsible for the estuarine turbidity maximum (ETM) formation. However, the influence of hydro-meteorological conditions on ETM dynamics is still not properly grasped and requires further investigation to be quantified. Based on a realistic 3-dimensional numerical model of the macrotidal Seine Estuary (France) that accounts for mud and sand transport processes, the objective of this study is to quantify the influence of the main forcing (river flow, tides, waves) on the ETM location and mass changes. As expected, the ETM location is strongly modulated by semidiurnal tidal cycles and fortnightly timescales with a high sensitivity to river flow variations. The ETM...
Tipo: Text
Palavras-chave: Estuary; Mud; Sand; Hydrodynamics; Turbidity maximum; Waves; Measurement; Modeling.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00416/52770/53638.pdf

Role of particle sorption properties in the behavior and speciation of trace metals in macrotidal estuaries: The cadmium example
Provedor de dados: 5
Autores: Gonzalez, Jean-louis; Thouvenin, Benedicte; Dange, Catherine; Chiffoleau, Jean-francois; Boutier, Bernard.
The role of particles in the fate and speciation of trace metals in macrotidal estuaries was studied using a surface complexation model (MOCO). Cadmium was selected as the target metal contaminant due to its reactivity in estuaries: cadmium behavior is mainly controlled by heterogeneous processes (sorption/desorption) related to salinity and suspended matter gradients.   Various scenarios of suspended matter distribution according to salinity were simulated. The impact of surface properties (specific surface area, density of surface sites, acido-basic properties, and complexation constant) was evaluated using data collected on particles from the Gironde, Loire, and Seine estuaries.   Our results show that particle surface properties, evaluated on the basis...
Tipo: Text
Palavras-chave: Turbidity maximum; Speciation; Sorption; Particles; Modeling; Macrotidal estuaries; Cadmium.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2005.pdf

Rôle des particules sur le comportement et la spéciation de métaux traces: exemple du cadmium
Provedor de dados: 5
Autores: Gonzalez, Jean-louis; Thouvenin, Benedicte; Dange, Catherine.
The role of particles in the fate and speciation of trace metals in macrotidal estuaries was studied using a surface complexation model (MOCO). Cadmium was selected as the target metal contaminant due to its reactivity in estuaries: cadmium behavior is mainly controlled by heterogeneous processes (sorption/desorption) related to salinity and suspended matter gradients.Various scenarios of suspended matter distribution according to salinity were simulated. The impact of surface properties (specific surface area, density of surface sites, acidity instrinsic properties and complexation constant) was evaluated using data collected on particles from the Gironde, Loire and Seine estuaries.
Tipo: Text
Palavras-chave: Particles; Speciation; Sorption/desorption; Cadmium; Modeling; Surface properties.
Ano: 2007
URL: https://archimer.ifremer.fr/doc/00480/59152/61781.pdf

Modélisation des contaminants chimiques dans une colonne d'eau. Modèle MOMO (MORGAN+MOCO).
Provedor de dados: 5
Autores: Thouvenin, Benedicte; Gonzalez, Jean-louis.
Within the framework of the "Contaminants cycle and modeling" project of the BE department ("Biogeochemistry and Ecotoxicology") in Ifremer, two chemical contaminant modeling software were developed between 1998 and 2011 (Gonzalez JL, 2017): the MORGAN model (Model behavior of ORGANic contaminants in an aquatic environment) and the MOCO model (Surface Complexation MOdel for metallic COntaminants). These two models had been brought together in a single "zero-dimensional" software (known as MOMO), which made it possible to simulate the various processes affecting the behavior of chemical contaminants in a homogeneous mass of water (biodegradation, adsorption/desorption, photolysis, hydrolysis, volatilization, surface complexation, cation exchange,...
Tipo: Text
Palavras-chave: Modelisation; Biogeochimie; Contaminants métalliques et organiques; Spéciation; Modeling; Biochemical; Trace metals - organic contaminants; Speciation.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00686/79771/82993.pdf

Sediment transport in the Bay of Marseille : Role of extrem events.
Provedor de dados: 5
Autores: Verney, Romaric; Jany, Cassandre; Thouvenin, Benedicte; Pairaud, Ivane; Vousdoukas, Michalis I.; Pinazo, Christel; Ardhuin, Fabrice; Cann, Philippe.
Human pressures on ecosystems have increased significantly over the last decades, and especially Mediterranean coasts are strongly impacted by the development of big cities and industrialized area, such as the Bay of Marseille. Prior to any investigations on ecological or contamination impacts, it was necessary to understand sediment dynamics and its response to natural extreme events such as storm or heavy rainfall events. In situ observations were dedicated to understand the behavior of bed sediments, and their spatial distribution. A benthic station was deployed for three months to observe the impact of extreme events on hydrodynamics and sediment dynamics in a critical zone of the study area. These measurementswere used to calibrate and validate the...
Tipo: Text
Palavras-chave: Sediment dynamics; Large coastal cities; Urban pressure; Extreme events; Wave; Rainfall; Marseille.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00204/31515/29929.pdf

Synthèse des études relatives à la modelistion de l'oxygène dissous dans l'estuaire de la Loire
Provedor de dados: 5
Autores: Thouvenin, Benedicte; Le Hir, Pierre; Maurice, Laurence; Romana, Louis-alexandre.
A la demande de l'Association pour la Protection de l'Environnement de l'Estuaire de la Loire, une étude sur le cycle de l'oxygène dissous a été entreprise. Un modèle mathématique a été développé en plusieurs étapes, associé à des études sur le cycle de la matière organique dans le système bouchon vaseux/crème de vase et au développement d'un modèle de transport sédimentaire. Après la mise en place d'un modèle d'advection-dispersion dans l'estuaire, qui reproduit l'évolution de l'oxygène dissous sur un cycle lunaire, l'application du modèle de transport sédimentaire a permis le perfectionnement du modèle d'oxygène dissous, qui tient compte alors des variables particulaires aussi bien que dissoutes et décrit les variations de l'oxygène pendant cinq mois....
Tipo: Text
Ano: 1995
URL: http://archimer.ifremer.fr/doc/00082/19289/16884.pdf

MASSILIA Project. Modelling of the Bay of Marseille : Impact of the Anthropogenic Supply on the marine coastal ecosystem
Provedor de dados: 5
Autores: 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

Modeling of PCB trophic transfer in the Gulf of Lions; 3D coupled model application
Provedor de dados: 5
Autores: Alekseenko, Elena; Thouvenin, Benedicte; Tronczynski, Jacek; Carlotti, F.; Garreau, Pierre; Tixier, Celine; Baklouti, Melika.
3D coupled modeling approach is used for the PCB dispersion assessment in the Gulf of Lion and its transfer to zooplankton via biogeochemical processes. PCB budgets and fluxes between the different species of PCB: dissolved, particulate, biosorbed on plankton, assimilated by zooplankton, which are governed by different processes: adsorption/desorption, bacteria and plankton mortality, zooplankton excretion, grazing, mineralization, volatilization have been estimated. Model outputs were compared with the available in situ data. It was found that the Rhone River outflows play an important role in the organism contamination in the coastal zone, whereas the atmospheric depositions are rather more important in the offshore zones. The transfer of the available...
Tipo: Text
Palavras-chave: PCBs; 3D coupled model; Gulf of Lions; Planktonic food web; CB153 fluxes.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00440/55177/56654.pdf

Modèle mathémathique sur la nitrification et le cycle de l'oxygène dissous en estuaire de la Seine
Provedor de dados: 5
Autores: 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