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| Registros recuperados: 38 | |
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| Van Wynsberge, Simon; Menkes, Christophe; Le Gendre, Romain; Passfield, Teuru; Andrefouet, Serge. |
| In remote coral reef environments, lagoon and reef in situ measurements of temperature are scarce. Sea Surface Temperature (SST) measured by satellite has been frequently used as a proxy of the lagoon temperature experienced by coral reef organisms (TL) especially during coral bleaching events. However, the link between SST and TL is poorly characterized. First, we compared the correlation between various SST series and TL from 2012 to 2016 in three atolls and one island in the Central South Pacific Ocean. Simple linear correlation between SST and TL ranged between 0.44 and 0.97 depending on lagoons, localities of sensors, and type of SST data. High-resolution-satellite-measurements of SST inside the lagoons did not outperform oceanic SST series,... |
| Tipo: Text |
Palavras-chave: Atoll lagoon; Pacific islands; Reef aperture; Climate change; Sea Surface Temperature. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00403/51491/52087.pdf |
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| Lalau, Noemie; Soulard, Benoit; Le Gendre, Romain. |
| Ce rapport fait partie du projet de recherche PRESENCE (PRESsions sur les Ecosystèmes récifo-lagonaires de Nouvelle-CalédoniE). L'objectif général 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. Une des tâches de PRESENCE consiste notamment à étudier, via des modèles hydrodynamiques, le devenir des apports terrigènes au sein des lagons, et cela à l'échelle de la Grande Terre. Ce rapport présente la méthodologie mise en oeuvre pour se constituer un jeu de données de forçages hydriques, continu sur la période 2011-2017, au pas de temps journalier et englobant la majorité des bassins versants sur lesquels nous disposons de mesures. |
| Tipo: Text |
Palavras-chave: Bassins versants; Nouvelle-Calédonie; Débit; Crues; Apports terrigènes; Grande Terre. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00505/61636/65558.pdf |
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| 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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| Ouillon, S.; Douillet, Pascal; Lefebvre, J. P.; Le Gendre, Romain; Jouon, Aymeric; Bonneton, P.; Fernandez,; Chevillon, C.; Magand, O.; Lefevre, J.; Le Hir, Pierre; Laganier, R.; Dumas, Franck; Marchesiello, P.; Madani, A. Bel; Andrefouet, S.; Panche, J. Y.; Fichez, R.. |
| The south-west lagoon of New Caledonia is a wide semi-open coral reef lagoon bounded by an intertidal barrier reef and bisected by numerous deep inlets. This paper synthesizes findings from the 2000-2008 French National Program EC2CO-PNEC relative to the circulation and the transport of suspended particles in this lagoon. Numerical model development (hydrodynamic, fine suspended sediment transport, wind-wave, small-scale atmospheric circulation) allowed the determination of circulation patterns in the lagoon and the charting of residence time, the later of which has been recently used in a series of ecological studies. Topical studies based on field measurements permitted the parameterisation of wave set-up induced by the swell breaking on the reef barrier... |
| Tipo: Text |
Palavras-chave: Hydrodynamics; Suspended sediment; New Caledonia; Coral reef lagoon; Sediment; Turbidity; Resuspension. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00014/12526/9401.pdf |
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| 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 |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00061/17211/15019.pdf |
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| Desclaux, Terence; Hubert, Clarisse; Le Tesson, Eric; Lemonnier, Hugues; Petton, Sebastien; Royer, Florence; Soulard, Benoit; Schohn, Thomas; Le Gendre, Romain. |
| Dans l’objectif de mieux caractériser le devenir en mer des apports terrigènes autour de la ville de Nouméa, Nouvelle-Calédonie, notamment suite au passage de dépressions et cyclones tropicaux, différents réseaux d’observation routiniers (GOPS, Météo-France, DAVAR) ont été complétés par l’installation d’instruments au niveau des exutoires marins de la Dumbéa et la Coulée, et par la réalisation répétée de profils hydrologiques (CTD) sur la zone côtière d’intérêt. L’objectif de ce rapport est de restituer et commenter les observations collectées. Le contexte météo-océanique et les observations réalisées sont d’abord exposés sur l’ensemble de la période étudiée, qui court du 1er décembre 2016 au 30 avril 2017. Les conséquences du passage du cyclone Cook sur... |
| Tipo: Text |
Palavras-chave: Apports terrigènes; Lagon; Campagne de mesure; Panache; Rivière; Cyclone; Dépression tropicale; Grand Nouméa; Nouvelle-Calédonie; Physico chimie. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00471/58315/60865.pdf |
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| Le Gendre, Romain; Morin, Jocelyne; Maheux, Frank; Fournier, Florent; Simon, Benjamin; Cochard, Marie-laure; Pierre-duplessix, Olivier; Dumas, Franck; Harmel, Béatrice; Paul, Catherine; Riou, Philippe. |
| Ce rapport est constitué de deux volumes : - Document 1 : ≪ Rapport principal ≫ qui presente les travaux realises et les résultats obtenus - Document 2 : ≪ Annexes ≫ qui contient l’ensemble des cartes, graphiques et documents de communication... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00188/29916/28376.pdf |
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| 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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| Pien, Sebastien; Maheux, Franck; Gauquelin, Thibaut; Le Gendre, Romain. |
| Sur plusieurs points du littoral français, les bancs sauvages d'huîtres creuses Crassostrea gigas se développent depuis une trentaine d'années. et cette colonisation a tendance à se développer vers le nord, conséquence probable du réchauffement climatique. Si la Normandie est encore très peu touchée par ce phénomène, il semble toutefois opportun de suivre l'évolution de cette colonisation dans les années à venir et apprécier les conséquences futures de cette colonisation sur l'économie ostréicole normande. Après une étude effectuée par l'intermédiaire d'un stage en 2010, la période 2011-2013 a permis de mettre en œuvre et d'améliorer les propositions de protocole émis lors des travaux de 2010. De plus, certains points particuliers, comme l'origine du... |
| Tipo: Text |
Palavras-chave: Huître; Colonisation; Hydrodynamisme; Crassotrea gigas; Espèce invasive. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00191/30258/28701.pdf |
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| Pien, Sebastien; Maheux, Frank; Dedieu, Karine; Le Gendre, Romain; Simon, Benjamin; Gauquelin, Thibaut. |
| Depuis 2010, le programme HLiN s’attache à suivre la colonisation et le recrutement des huîtres naturelles sur les côtes du département de la Manche. Après une période d’adaptation des protocoles à la réalité normande, il s’est posé la question de l’origine du recrutement des huîtres, notamment pour la côte ouest du Cotentin, entre les falaises de Champeaux et Saint Germain / Ay. Suite à ses travaux sur la dérive larvaire des moules de pêche en baie de Seine, le LERN de Port en Bessin avait mis au point un modèle de courantologie en 3 dimensions appelé NORM (issu du code MARS 3D). L’idée était d’appliquer la méthodologie de calage du modèle pour le golfe normand breton afin de simuler différents scénarios de ponte et de les corréler avec les observations... |
| Tipo: Text |
Palavras-chave: Colonisation huîtres sauvages; Crassostrea Gigas; Ponte; Dispersion larvaire; Fixation; Connectivité; Réseau de suivi. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00250/36151/34705.pdf |
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| 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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| 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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| 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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| 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... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00469/58067/60463.pdf |
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| 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 |
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| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00284/39480/37966.pdf |
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| Garnier, Josette; Le Gendre, Romain; Passy, Paul; Paris, Francois; Billen, Gilles; Callens, Julie; Cugier, Philippe; Tronquart, Olivier; Romero, Estela; Riou, Philippe. |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00092/20336/17982.pdf |
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| Registros recuperados: 38 | |
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