Academic literature on the topic 'Dynamique hydro-sédimentaire – Méditerranée (mer)'
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Dissertations / Theses on the topic "Dynamique hydro-sédimentaire – Méditerranée (mer)":
Akouango, Emile. "Morphodynamique et dynamique sédimentaire dans le Golfe du Lion : contribution à l'étude de la zone côtière dans l'actuel et le quaternaire récent." Perpignan, 1997. http://www.theses.fr/1997PERP0292.
Meslard, Florian. "Apports sableux par les fleuves côtiers méditerranéens et aléa de submersion marine (ASPLEC)." Electronic Thesis or Diss., Perpignan, 2023. http://www.theses.fr/2023PERP0053.
Obtaining accurate estimates of sediment budgets on the land-sea continuum and understanding how these budgets affect coastal dynamics has become a crucial issue in the current context of rising sea levels and retreating coastlines. The torrential nature of mediterranean coastal rivers, linked to intense meteorological events, is characterized by brief but violent flooding episodes, during which most of the water and sediment discharge is delivered to the coastal zone in a few days. This episodic behavior of operation also has an impact on their river outlet as well, which can become obstructed by the development of sandy spits, leading to heavy flooding in coastal areas during concomitant storm and flood events. The aim of this thesis is to improve our understanding of intermittent river mouths processes, and to assess their interaction with the sediment transport in a land-sea continuum. A multi-scales (land-sea) spatio-temporal approach combining morphological, hydro-meteorological and sediment transport monitoring data was applied to the Têt River, an example of a mediterranean coastal river. The results provided with 1) a better understanding of the mechanisms at this intermittent river mouth system governed by auto-allocyclic and anthropogenic processes, 2) an improved estimates of suspended solids fluxes, provided by the first estimates of suspended and near-bottom sand fluxes, as well as understanding the role of morphology on their transfer to the coastal zone, and 3) an improved understanding of concomitant storm and flood events on the dynamics of the morphological response and the associated sediment transport
Vicaire, Olivier. "Dynamique hydro-sédimentaire en Mer du Nord méridionale : du Cap Blanc-Nez à la frontière belge." Lille 1, 1991. http://www.theses.fr/1991LIL10168.
Lorthiois, Thomas. "Dynamique des matières en suspension dans le panache du Rhône (Méditerranée occidentale) par télédétection spatiale " couleur de l'océan "." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00772427.
Hemdane, Yacine. "Dynamique hydro-sédimentaire de l'avant-côte de type macrotidal : le cas du littoral du Nord-Pas-de-Calais, France." Littoral, 2006. http://www.theses.fr/2006DUNK0302.
Three field campaigns were carried out in the nearshore zone of the Opal Coast, Southern North Sea, with the aim of improving our understanding of the hydrodynamics and sediment transport patterns prevailing on a macrotidal shoreface subject to significant wind influence. Three field sites, respectively subject to erosion, accretion and stability, were chosen and hydrodynamic conditions (water levels, waves, longshore and cross-shore currents) were monitored at depths ranging from 5 to 10 m together with bed sediment sampling under various wind forcing conditions. Simulation of sediment transport was carried out using the semi-quantitative grain-size vector model of Gao and Collins (1992) and the Sedtrans96 model of Li and Amos (2001). The models of Yalin (1963) and Grant and Madsen (1986) were used to calculate bed shear stress and sediment entrainment. The results highlight an essentially longshore sediment circulation system hinged on the regional bi-directional flood-ebb tidal pattern. Superimposed on this system is a spatially and temporally variable asymmetry pattern due to wind and wind-wave forcing and to the local bathymetry which is dominated by a complex system of tidal banks and ridges. The local bathymetry probably induces resonance phenomena that affect the tidal wave and tidal ellipse vectors. Cross-shore sediment transport processes only occur during tidal reversal phases, when negligible tidal current velocities give way to wind-forced currents and wave action favourable to onshore transport, qith offshore transport induced by bed return flows and infragravity waves (between 0,03 and 0,003 Hz). However, the obliquity of the major axis of the tidal ellipse relative to shoreline orientation may also generate cross-shore flows across the shoreface. It is important to note that the strong longshore tidal currents, sometimes reinforced by wind forcing, may annul cross-shore sediment transport. This is highlighted by the longshore morphology of the shoreface tidal ridges which appear to be subject to little onshore movement
Fossi, Fotsi Yannick. "Dynamique morpho-sédimentaire de l’estuaire du Wouri, Cameroun." Thesis, La Rochelle, 2022. http://www.theses.fr/2022LAROS012.
The Wouri estuary, located in the heart of the Gulf of Guinea and open to the Atlantic Ocean, is subject to a wide range of atmospheric, oceanic, continental and anthropic influences at different time scales (short and long term) controlling its evolution. The first part of this thesis, based on archives dating back to the 20th century, allows us to reconstruct the history of the evolution of the Wouri estuary coastline. At the same time, in order to determine the evolution trends of the water levels, to quantify and qualify the kinematics of the coastline and the bottoms in the estuary, an inventory, digitization and analysis of historical documents was carried out. This allowed to record an evolution of the average level at a rate of about 25mm/year in 17 years (2002 - 2019). The results revealed a predominance of variations dominated by erosion downstream and conversely by accretion upstream, over the 64-year period (1948-2012). These trends are accentuated by the presence of amplifying factors (anthropogenic pressure and climate change). In order to study the hydrodynamic and sedimentary processes in the short term, a numerical modeling of the tidal propagation and the distribution of salinities and fine sediments was performed using TELEMAC 3D (calibrated and validated thanks to in-situ measurements acquired during 2019). The tide showed an asymmetry dominated by the ebb in its lower part and inversely by the flood in its upper part. The distribution of salinity allowed to characterize the estuary from well mixed in spring tide, particularly in low water to stratified in neap tide, particularly in flood period. Seasonal variations of the river regime have shown a longitudinal migration of the position of the maximum turbidity zone : upstream during low water and downstream during high water with a massive export of sediments in the intermediate and downstream part of the estuary. In a current context of climate change associated with strong anthropogenic impacts, this study highlights the need to use historical archives, in-situ data coupled with a numerical model to better understand the past and present evolution of hydrodynamics and sediment dynamics
Kende, Julia. "Tectonique et hydrologie en mer de Marmara : histoire de l'ouverture de la mer de Marmara et reconstitution de la réponse hydrologique aux variations climatiques depuis le dernier interglaciaire." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0076.
The Marmara Sea is the keystone of a complex hydrological system between the Mediterranean and the Black Sea. There, the balance between inputs and outputs has been disturbed during glacial periods when the global ocean level dropped below the sill depths, isolating the Marmara Sea. The alternation of marine and lacustrine sediments reflects these variations. The Sea of Marmara is also an active tectonic structure cut by the North-Anatolian fault northern branch. The ruptures of this continental dextral transform fault, one of the longest in the world, are regularly causing massive earthquakes. Many scientific studies are aiming at characterizing the fault structure and its functioning in the hope of being able to foresee the next earthquake close to Istanbul. This thesis presents two studies tackling this subject.The first one presents an interpretation of the crust geometry based on the analysis of a 3D crustal model built from the inversion of gravity data corrected from the influence of sedimentary basins. From the model, we quantify the role of extension in the basin opening and show the existence of ductile flows, in the lower crust, that spread the thinning away from the basins. The second study purpose was to confirm or reverse the sedimentary age models available in the Marmara Sea through the direct study of the sediments constituting the first main reflector interpreted in the models. We used a broad range of methods to build a new age model for one core such as geophysics, paleo-magnetism, tephrochronology and a paleo-environmental characterization. The results give a date for the first main reflector that is younger than the one assessed by previous studies
Leroux, Jérôme. "Chenaux tidaux et dynamique des prés-salés en régime méga-tidal : approche multi-temporelle du siècle à l'événement de marée." Phd thesis, Université Rennes 1, 2013. http://tel.archives-ouvertes.fr/tel-01005360.