Consulta: subjectFacets:"Vagues"
Registros recuperados: 6
Data/hora: 01/06/2024 07:31:23

Modélisation des turbidités en Bretagne sud et validation par des mesures in situ
Provedor de dados: 5
Autores: Tessier, Caroline; Le Hir, Pierre; Dumas, Franck; Jourdin, F.
A hydrodynamic and sediment model of South Brittany is calibrated with ADCP measurements, which allow to estimate hydrodynamic forcing and concentration of suspended particulate matter. The exercise of comparison between observed and simulated concentrations reveals that turbidity is highly dependant on numerous strongly coupled sedimentary and physical processes.
Tipo: Text
Palavras-chave: Waves; ADCP; Acoustical backscattering; Modelisation; Turbidity; Vagues; ADCP; Rétrodiffusion acoustique; Modélisation; Turbidité.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6300.pdf

Caractérisation et dynamique des turbidités en zone côtière : L'exemple de la région marine Bretagne Sud
Provedor de dados: 5
Autores: Tessier, Caroline.
The space and time turbidity variability in Southern Brittany was studied, from the combination of results of hydrological campaigns, long-term instrumented moorings, satellite observations and 3D process-based numerical modelling.  Previous observations exhibit a cross-shore concentration gradient with values hardly exceeding 30 mg/l beyond the littoral zone. Acoustic profilers (ADCP) were moored to measure currents, waves and the associated dynamics of fine particles. Time series of mass concentration in the whole water column were estimated from the analysis of the backscattered signal. During wave episodes, values can reach 100 mg/l at 1.50 m above bottom, just outside the Bay of Vilaine. The empirical calibration of the signal with independent...
Tipo: Text
Palavras-chave: Southern Brittany; MARS 3D numerical model; Acoustic backscattering; Acoustic current profiler; Waves; Circulations; Turbidity; Bretagne Sud; Modèle numérique MARS 3D; Rétrodiffusion acoustique; Profileur acoustique de courant; Vagues; Circulations; Turbidité.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/these-2325.pdf

Modélisation du transport particulaire dans le Golfe du Lion en vue d'une application au devenir des traceurs radioactifs issus du Rhône
Provedor de dados: 5
Autores: Dufois, Francois.
Among the contaminants introduced into the environment, the artificial radionuclides appear particularly important to take into account because of their chemical toxicity and/or of their radiotoxicity. Some radionuclides present a high affinity with particles so that the study of the sediment dynamics is a useful preliminary to the study of their dispersion on the open sea. This thesis is focused on the fate of sediments in the Gulf of Lions (NW Mediterranean) and in particular on the impact of the Rhone River, which is the main source of particulate matter in the Gulf of Lions. In order to study the sediment transport mechanisms on various space and time scales, this thesis is based on mathematical modelling. The hydro-sedimentary model set up in the Gulf...
Tipo: Text
Palavras-chave: Waves; MARS 3D; Hydrodynamic; Radionuclides; Modelling; Sediment; Rhône prodelta; Gulf of Lions; Vagues; MARS 3D; Hydrodynamique; Radioéléments; Modélisation; Sédiment; Prodelta du Rhône; Golfe du Lion.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-6308.pdf

Surfaces de mer et dissipation d'énergie
Provedor de dados: 5
Autores: Veras Guimaraes, Pedro.
Stochastic wave formulations and models are the most common tools for the assessment and forecast of sea surface conditions. Their ability to account for some of the processes encountered by waves during their evolution remains however a central question. Among other processes, the wave dissipation is for instance still poorly quantified and traditional methods for wave measurements fail to proper insight into its physics in a wide range of conditions. In this context, the work presented in this PhD aims to explore available observation techniques for their application to several quantitative aspects of the dissipation of wave energy, and particularly for short wave modulated by strong tidal currents, for short wave modulated by longer waves. This work...
Tipo: Text
Palavras-chave: Vagues; Stéréo-vidéo; Bouée dérivante; Modélisation; Interaction vague-courant; Modulation; Déferlement; Breaking; Ocean waves; Stereo video; Drifting buoy; Wave modeling; Wave-current interaction.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00498/60967/64375.pdf

Interactions vagues-banquise en zones polaires
Provedor de dados: 5
Autores: Boutin, Guillaume.
Sea ice, which covers most of the ocean near the poles, is a key component of the climate system. Global warming is driving its massive melting, especially in the Arctic. Where sea ice cover decreases, fetch increases leading to more energetic sea states. This means potentially enhanced wavesice interactions effects in the future. The quick evolution of sea ice extent and volume combined with the intensification of human activities in polar regions urge us to improve our understanding of waves-ice interactions.Sea ice attenuates waves. They can however propagate through it and break it far into the ice cover. Attenuation depends on ice properties such as floe size, thickness, etc. Once broken, resulting floes are more likely to drift and melt. In addition,...
Tipo: Text
Palavras-chave: Vagues; Banquise; Modélisation; Zone Marginale de Glace; Waves; Sea ice; Model; Marginal Ice Zone.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00498/60968/64376.pdf

Impact des installations ostréicoles sur l’hydrodynamique et la dynamique sédimentaire
Provedor de dados: 5
Autores: Kervella, Youen.
Oyster farm structures represent artificial obstacles which can disturb tidal currents and wave propagation, and thus modify sediment transport patterns. Local deposition may result from these modifications, in proportions that may threaten the oyster farming. The impact of structures on hydrodynamics, waves and currents, is investigated at different spatial scales by means of in-situ measurements, experimental tests and numerical modeling. These different approaches show that in the near-field, tidal currents are modified in terms of intensity and direction but there is no significant impact on the waves. On the other hand, at the scale of the oyster farm, a significant reduction of the current velocities and a large wave height attenuation are recorded....
Tipo: Text
Palavras-chave: Tables à huîtres; Envasement; Courants; Vagues; Sédiments; Impact; Oyster tables; Silting up; Currents; Waves; Sediment; Impact.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00011/12262/9043.pdf