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Registros recuperados: 13
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Carbon Dynamics Along the Seine River Network: Insight From a Coupled Estuarine/River Modeling Approach ArchiMer
Laruelle, Goulven G.; Marescaux, Audrey; Le Gendre, Romain; Garnier, Josette; Rabouille, Christophe; Thieu, Vincent.
The Seine river discharges over 700 Gg of carbon (C) every year into the sea mostly under the form of dissolved inorganic carbon (DIC) and emits 445 Gg under the form of carbon dioxide (CO2) to the atmosphere over its entire river network. The watershed, which drains 76,000 km2, is heavily populated with 18 106 inhabitants and is thus submitted to large anthropic pressure. The offline coupling of two Reactive Transport Models is used to understand the complex spatial and temporal dynamics of carbon, oxygen and nutrients and quantify the CO2 exchange at the air-water interface along the main axis of the river. The estuarine section of the Seine is simulated by the generic estuarine model C-GEM (for Carbon Generic Estuarine Model), while the upstream part of...
Tipo: Text Palavras-chave: Dissolved inorganic and organic carbon; Carbon dioxide; Reactive-transport model; Seine river and estuary; Biogeochemical budget.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00493/60421/63858.pdf
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Coupling a watershed model of the Seine river with a 3D ecological model of the English Channel in order to study eutrophication problems ArchiMer
Cugier, Philippe; Passy, Paul; Callens, Julie; Garnier, Josette; Riou, Philippe; Billen, Gilles; Le Gendre, Romain; Paris, Francois.
Eutrophication of the Seine river/estuary/bay continuum of the French coast of the English Channel is a subject of growing concern. Because of huge nutrient inputs from the Seine river, with an excess of nitrogen over phosphorus and silica, chlorophyll concentrations reach very high level and episodic blooms of toxic dinoflagellates are regularly observed. In order to better understand the relationship between these ecological processes and the human activities in the Seine watershed, two models have been developed and used in connection : 1/ a model describing nutrient (N, P, Si) transfer processes at the scale of the whole Seine Basin (SENEQUE/RIVERSTRAHLER, Thieu et al, 2009), allowing human activity (agricultural practices, waterscape management, urban...
Tipo: Text
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00061/17211/15019.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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Eutrophication modelling chain for improved management strategies to prevent algal blooms in the Bay of Seine ArchiMer
Passy, Paul; Le Gendre, Romain; Garnier, Josette; Cugier, Philippe; Callens, Julie; Paris, Francois; Billen, Gilles; Riou, Philippe; Romero, Estela.
Eutrophication of the Seine estuary and the Bay of the Seine is a crucial environmental issue for the management of ecosystems and economic activities related to fisheries and tourism. A large quantity of nutrients, especially nitrogen, is brought to the coastal zone by the Seine River, the main input of that area, but also by smaller rivers along the Normandy coast. This large delivery of nitrogen leads to an imbalance between nitrogen (N), phosphorus (P) and silica (Si), which affects the growth of planktonic organisms and can exacerbate the occurrence of harmful algal blooms (HABs). These events can be damaging for shellfish fisheries, an important economic resource for the region. The study describes a new modelling chain coupling a riverine and a...
Tipo: Text Palavras-chave: Eutrophication; Harmful algal blooms; Nutrient load; Modelling; Water quality; Seine.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00300/41103/41542.pdf
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Large-scale patterns of river inputs in southwestern Europe: seasonal and interannual variations and potential eutrophication effects at the coastal zone ArchiMer
Romero, Estela; Garnier, Josette; Lassaletta, Luis; Billen, Gilles; Le Gendre, Romain; Riou, Philippe; Cugier, Philippe.
We provide data on nutrient export for 28 rivers in southwestern Europe and analyze long-term changes in the context of anthropogenic pressures and regulation policies. Special attention is given to seasonal variations, because the integrated annual values that are usually provided do not allow us to establish comparisons with seasonal phytoplankton dynamics. The eutrophication risk associated with river inputs is addressed by means of an indicator (Index of Coastal Eutrophication Potential, ICEP, Billen and Garnier, Mar Chem 106:148–160, 2007). An overview of the temporal evolution and the intra-annual variability of the ICEP is discussed for specific rivers and integrated coastal regions. The annual dynamics of the eutrophication indicator is analyzed to...
Tipo: Text Palavras-chave: River inputs; Coastal zone; N:P:Si stoichiometry; Eutrophication; Seasonality; Europe.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00090/20152/17928.pdf
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Long-term water quality in the lower Seine: Lessons learned over 4 decades of monitoring ArchiMer
Romero, Estela; Le Gendre, Romain; Garnier, Josette; Billen, Gilles; Fisson, Cedric; Silvestre, Marie; Riou, Philippe.
The Seine River is a highly artificialised catchment in Europe, comprising both productive agricultural areas and intense industrial and commercial activity. Due to its strategic importance, monitoring programs in the river started as early as the 1970s. The present study compiles and analyses this valuable data set (1970–2014), thoroughly describing the riverine section downstream of Paris and the estuary. We identify long-term trends and shifting patterns in nutrients and oxygen, and pay special attention to the river’s evolution after the year 2000, when the European Water Framework Directive came into force. The study has a manifest management perspective, and the results are discussed on the basis of the environmental quality standards proposed in...
Tipo: Text Palavras-chave: Seine River; Water quality; Nutrients; Long-term trends; WFD; Policy.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00311/42202/41541.pdf
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Managing the Agri-Food System of Watersheds to Combat Coastal Eutrophication: A Land-to-Sea Modelling Approach to the French Coastal English Channel ArchiMer
Garnier, Josette; Riou, Philippe; Le Gendre, Romain; Ramarson, Antsiva; Billen, Gilles; Cugier, Philippe; Schapira, Mathilde; Théry, Sylvain; Thieu, Vincent; Ménesguen, Alain.
The continental coastal waters of the Eastern Channel, from Normandy to Hauts-de-France, are subject to the major influence of unbalanced nutrient inputs from inflowing rivers. Several episodes of harmful algal blooms (HABs) compromising fishing and shellfish farming activities have been observed at the coast. For a better understanding of how the land-to-sea aquatic continuum functions, the GRAFS-RIVERSTRAHLER river biogeochemical model was implemented to cover the watersheds of 11 rivers flowing into this area (including the Seine) and chained with the ecological marine ECO-MARS3D model, applied to the French Northern coastal zone. Human activities strongly impact on the functioning of coastal ecosystems. Specifically, for these fertile soils of Northern...
Tipo: Text Palavras-chave: Toxic microalgae; Pseudo-nitzschia spp.; River basins; Nutrient flows; Scenarios; Coastal zone ecosystem; Modelling.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00589/70076/68049.pdf
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Modeling the biogeochemical functioning of the Seine estuary and its coastal zone: Export, retention, and transformations ArchiMer
Romero, Estela; Garnier, Josette; Billen, Gilles; Ramarson, Antsiva; Riou, Philippe; Le Gendre, Romain.
The model ECO‐MARS3D, successfully applied thus far to coastal ecosystems, has been extended to encompass the Seine estuary up to Poses, at the limit between the river and the estuary. We used updated bathymetric data and thoroughly calibrated the hydrodynamics and the sedimentary dynamics in the turbidity maximum zone (TMZ). Biogeochemical processes related to oxygen were newly implemented, and freshwater phytoplankton and zooplankton groups were added to the existing marine groups. The simulations allowed us to evaluate the filter effect of the estuary with regard to the main nutrients (N, P, and Si). Today, this filter role appears quite limited and variable depending on the hydrology. On average, considering three different hydrological years, the...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00469/58067/60463.pdf
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Modèlisation des transferts de nutriments dans le continuum "Seine, Seine Aval, Baie de Seine" ArchiMer
Billen, Gilles; Cugier, Philippe; Garnier, Josette; Menesguen, Alain; Guillaud, Jean-francois; Durand, I.
Le processus d'eutrophisation des milieux marins côtiers, et le développement épisodiques de dinoflagellés qui en est une des manifestations, dépend de manière complexe de l'équilibre des flux d'azote, de phosphore et de silice en provenance des milieux terrestres du bassin versant. Ceux ci sont déterminés par la manière dont les activités humaines sur le bassin versant interagissent avec les processus naturels. La possibilité de prévoir l'effet sur l'eutrophisation marine des mesures prises pour l'amélioration de la qualité des eaux continentales dépend donc à la fois de notre connaissance du fonctionnement des milieux marins et de celui des bassins versants. En vue de développer les outils de modélisation nécessaire pour prévoir l'Etat de la Baie de...
Tipo: Text
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00106/21695/19274.pdf
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NEREIS (Nutrient Export Role on Eutrophication. Indicators and model Scenarios) - Rapport Seine-Aval ArchiMer
Garnier, Josette; Le Gendre, Romain; Passy, Paul; Paris, Francois; Billen, Gilles; Callens, Julie; Cugier, Philippe; Tronquart, Olivier; Romero, Estela; Riou, Philippe.
Tipo: Text
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00092/20336/17982.pdf
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Nitrogen leaching from organic agriculture and conventinal crop rotations Organic Eprints
Benoit, Marie; Garnier, Josette.
The goal of our study is to investigate nitrogen leaching from organic agriculture, taking into account a complete organic rotation (6-9 years) and to compare the results with leaching from conventional systems. There are long time series on sub-root crop concentrations in conventional agriculture in the Seine Basin. These scored an average of 25 ± 4 mg N-NO3.l-1 (standard for drinking water is 11 mg N-NO3.l-1) in different types of soil, crops and climatic conditions. However, no data still exists for organic farming (OF) in this area. In 2012-2013, a total of eight practices of arable crops have been equipped with suction cups for all their rotations (5 in OF and 3 in CF), in three pedoclimatic situations, in order to determine concentrations and fluxes...
Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover; Air and water emissions; Farm nutrient management; Post harvest management and techniques.
Ano: 2014 URL: http://orgprints.org/23831/1/23831_MM.pdf
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Nutriment Export Role on Eutrophisation. Indicators and model Scénarios (NEREIS) ArchiMer
Garnier, Josette; Billen, Gilles; Laverman, Anniet; Amsaleg, Céline; Tronquart, Olivier; Martinez, Anun; Mercier, Benjamin; Riou, Philippe; Le Gendre, Romain; Cugier, Philippe; Nedelec, Florence.
Les Objectifs de cette étude sont:1. Réactualiser la chaine de modélisation des têtes de bassins aux zones côtières et faire ainsi dialoguer le modèle du bassin de la Seine (Seneque/Riverstrahler) avec un modèle Estuaire/Baie de Seine (Mars 3D).2. Observer les effets, sur la basse Seine et l'estuaire en particulier, des nouveaux traitements dans les stations d'épuration du bassin.3. Quantifier les flux d'azote à la zone côtière par rapport à ceux du phosphore et de la silice.4. Synthétiser les données REPHY et RHLN pour valider l'indicateur ICEP développé au cours de la phase précédente de Seine-Aval, en cherchant à comprendre les déterminismes de la toxicité des blooms algaux.5. Construire des scénarios futurs permettant de tester, grâce au modèles,...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00018/12884/9847.pdf
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Scénarios prospectifs du système agro-alimentaire du bassin de la Seine à l’horizon 2040 ArchiMer
Billen, Gilles; Garnier, Josette; Ramarson, Antsiva; Romero, Estela; Thieu, Vincent; Le Noe, Julia; Silvestre, Marie; Thery, Sylvain; Barles, Sabine; Bognon, Sabine; Castaings, Jerome; Legendre, Romain; Riou, Philippe; Bacq, Nicolas; Fisson, Cédric.
Le système agro-alimentaire du bassin de la Seine est aujourd’hui caractérisé par une extrême spécialisation en grandes cultures céréalières de sa partie centrale, l’élevage étant repoussé vers sa frange orientale où domine la polyculture-élevage, et celle occidentale dont les systèmes se rapprochent du modèle d’élevage intensif du Grand Ouest. Cette spécialisation s’inscrit dans le mouvement historique de «modernisation» de l’agriculture qui s’affirme au milieu du XXe siècle, et est accentué en ce début de XXIe siècle par les politiques publiques et privées qui visent à renforcer la concentration de population le long de l’axe Paris-Le Havre («Le Grand Paris») au détriment des zones amont du bassin, et à accroitre la place de la France comme exportatrice...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00416/52796/53695.pdf
Registros recuperados: 13
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