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Registros recuperados: 8
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Atmospheric storm surge modeling methodology along the French (Atlantic and English Channel) coast ArchiMer
Muller, Heloise; Pineau-guillou, Lucia; Idier, Deborah; Ardhuin, Fabrice.
Storm surge modeling and forecast are the key issues for coastal risk early warning systems. As a general objective, this study aims at improving high-frequency storm surge variations modeling within the PREVIMER system (www.previmer.org), along the French Atlantic and English Channel coasts. The paper focuses on (1) sea surface drag parameterization and (2) uncertainties induced by the meteorological data quality. The modeling is based on the shallow-water version of the model for applications at regional scale (MARS), with a 2-km spatial resolution. The model computes together tide and surge, allowing properly taking into account tide-surge interactions. To select the most appropriate parameterization for the study area, a sensitivity analysis on sea...
Tipo: Text Palavras-chave: Storm surge; MARS; Sea surface drag; Meteorological forcing.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00219/32982/31404.pdf
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Estimating the Lagrangian residual circulation in the Iroise Sea ArchiMer
Muller, Heloise; Blanke, Bruno; Dumas, Franck; Lekien, Francois; Mariette, Vincent.
In this study, the Lagrangian residual circulation in the Iroise Sea is estimated by a numerical method where the trajectories of the particles released in any given velocity field are calculated by a diagnostic tool. From their knowledge, the residual Lagrangian currents are computed over a whole number of M2 tidal cycles. The Lagrangian residual circulation is mapped from sea surface currents measured by HF radars and from the surface currents computed with the Model for Applications at Regional Scales (MARS), a regional 3D ocean model forced, here, by the Weather Research and Forecasting (WRF) regional meteorological model. In order to overcome inconvenient space- and time-variations in radar coverage, the measured radar data are interpolated,...
Tipo: Text Palavras-chave: High frequency radar data; Regional ocean modeling; Lagrangian residual circulation; Iroise Sea.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-7324.pdf
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Etude de la circulation résiduelle lagrangienne en mer d'Iroise ArchiMer
Muller, Heloise.
The aim of this work is to assess the lagrangian residual circulation in the Iroise sea and to evaluate the relative contribution of the different physical processes at play. We calculate water displacements with a diagnostic lagrangian tool that computes the full trajectories of Active particles advected in a given velocity field. The lagrangian residual circulation is inferred from trajectories integrated over an appropriate period. This analysis is applied both to ocean model ouputs and genuine, gridded current measurements. These two sources of data are indeed complementary to study the lagrangian residual circulation according to the impact of the physical processes at play. We used sea surface currents measured by HF radars and surface currents...
Tipo: Text Palavras-chave: Mer d'Iroise; Modélisation régionale océanique; Circulation résiduelle lagrangienne; Radar HF; Iroise sea; Regional oceanic modeling; Lagrangian residual circulation; HF radar.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/00011/12258/9034.pdf
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High-resolution atmospheric forcing for regional oceanic model: the Iroise Sea ArchiMer
Muller, Heloise; Dumas, Franck; Blanke, Bruno; Mariette, Vincent.
This study was aimed at modeling, as realistically as possible, the dynamics and thermodynamics of the Iroise Sea by using the Model for Applications at Regional Scale (MARS), a regional ocean 3D model. The horizontal resolution of the configuration in use is 2 km with 30 vertical levels. The 3D model of the Iroise Sea is embedded in a larger model providing open boundary conditions. As regards the atmospheric forcing, the originality of this study is to force the regional ocean model with the high-resolution (6 km) regional meteorological model, Weather Research and Forecasting (WRF). In addition, as the air surface temperature is highly sensitive to the sea surface temperature (SST), this regional meteorological model is improved by taking into account a...
Tipo: Text Palavras-chave: High frequency radar data; WRF; MARS; Iroise Sea.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3518.pdf
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Identification of typical scenarios for the surface Lagrangian residual circulation in the Iroise Sea ArchiMer
Muller, Heloise; Blanke, Bruno; Dumas, Franck; Mariette, Vincent.
This paper describes the surface Lagrangian residual circulation (LRC) over 2.5 day intervals in the Iroise Sea, west of France, and evaluates, for operational purposes, the influence of the different physical mechanisms that govern it. The method consists of the calculation of water displacements with a diagnostic Lagrangian tool that computes the trajectories of numerical particles in a given velocity field. The LRC is inferred from trajectories integrated over five M2 tidal cycles. The analysis is applied to both gridded genuine current measurements and ocean model outputs: the sea surface currents are derived from high-frequency (HF) radar measurements and from MARS, a 3-D regional ocean model used here in idealized configurations. To substantiate the...
Tipo: Text
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00011/12220/9004.pdf
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Infragravity waves: from driving mechanisms to impacts ArchiMer
Bertin, Xavier; De Bakker, Anouk; Van Dongeren, Ap; Coco, Giovanni; Andre, Gael; Ardhuin, Fabrice; Bonneton, Philippe; Bouchette, Frederic; Castelle, Bruno; Crawford, Wayne C.; Davidson, Mark; Deen, Martha; Dodet, Guillaume; Guerin, Thomas; Inch, Kris; Leckler, Fabien; Mccall, Robert; Muller, Heloise; Olabarrieta, Maitane; Roelvink, Dano; Ruessink, Gerben; Sous, Damien; Stutzmann, Eleonore; Tissier, Marion.
Infragravity (hereafter IG) waves are surface ocean waves with frequencies below those of wind-generated "short waves" (typically be- low 0.04 Hz). Here we focus on the most common type of IG waves, those induced by the presence of groups in incident short waves. Three related mechanisms explain their generation: (1) the development, shoaling and release of waves bound to the short-wave group envelopes (2) the modulation by these envelopes of the location where short waves break, and (3) the merging of bores (breaking wave front, resembling to a hydraulic jump) inside the surfzone. When reaching shallow water (O(1-10 m)), IG waves can transfer part of their energy back to higher frequencies, a process which is highly dependent on beach slope. On gently...
Tipo: Text Palavras-chave: Infragravity waves; Bound wave; Dissipation; Reflection; Sediment transport; Barrier breaching; Seiche; Earth hum.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00417/52876/53800.pdf
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PREVIMER: Improvement of surge, sea level and currents modelling ArchiMer
Pineau-guillou, Lucia; Dumas, Franck; Theetten, Sebastien; Ardhuin, Fabrice; Lecornu, Fabrice; Le Roux, Jean-francois; Idier, Deborah; Muller, Heloise; Pedreros, Rodrigo.
The pre-operational system PREVIMER provides coastal observations and forecasts along French coasts. It provides, among other variables, currents, sea levels, surges and waves. This paper describes the development and validation of a high temporal (15 minutes) and spatial (250 m) resolution modeling system, based on MARS hydrodynamic model (Lazure and Dumas 2008), along the Atlantic and English Channel coasts. Models benefi t from experiments developed during the PREVIMER project by: (1) taking better into account wind and wave actions (improving surface drag coeffi cient parameterization), (2) taking into account a better meteorological forcing (improving spatial and temporal meteorological resolution). These high resolution models have been integrated in...
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00189/30036/28522.pdf
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Tide-surge interaction in the English Channel ArchiMer
Idier, Deborah; Dumas, Franck; Muller, Heloise.
The English Channel is characterised by strong tidal currents and a wide tidal range, such that their influence on surges is expected to be non-negligible. In order to better assess storm surges in this zone, tide-surge interactions are investigated. A preliminary data analysis on hourly surges indicates some preferential times of occurrence of large storm surges at rising tide, especially in Dunkerque. To examine this further, a numerical modelling approach is chosen, based on the 2DH shallow-water model (MARS). The surges are computed both with and without tide interaction. For the two selected events (the November 2007 North Sea and March 2008 Atlantic storms), it appears that the instantaneous tide-surge interaction is seen to be non-negligible in the...
Tipo: Text
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00131/24176/22355.pdf
Registros recuperados: 8
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