Consulta: subjectFacets:"Érosion"
Registros recuperados: 6
Data/hora: 01/06/2024 09:21:15

Dynamique des sédiments fins et mixtes des zones intertidales de la baie de Marennes-Oléron
Provedor de dados: 5
Autores: Kervella, Stephane.
This thesis aims at increasing the general knowledge on sediment dynamics of intertidal flats in the Marennes-Oléron Bay, according to physical, biological and anthropogenic factors.  The conducted research is compound of three complementary studies: (1) a study of sediment behaviour through applied rheophysics on intertidal superficial sediments; (2) a hydro-sedimentary study based on identification of the forcing action (physical, biological or anthropogenic) on the intertidal flat stability over several time scales (from the event to several months); (3) a specific application of the model SiAM-2DH to the Marennes-Oléron Bay.  The surface sediments shows a mechanical behaviour that mainly depends on the fine fraction for a composition that contains up...
Tipo: Text
Palavras-chave: Rhéophysique; Seuil d’écoulement; Sédiments cohésifs et mixtes; Sédimentation; Érosion; Hydrodynamique; Vasière; Zone intertidale; Conchyliculture; ALTUS; SiAM-2DH; Baie de Marennes-Oléron; Rhéophysics; Shear strenght; Cohesive and mixed sediment; Sédimentation; Erosion; Hydrodynamics; Mudflat; Intertidal area; Oyster; ALTUS; SiAM-2DH; Marennes-Oléron Bay.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00004/11534/8117.pdf

Bilan des tempêtes de l’hiver 2013-2014 sur la dynamique de recul du trait de côte en Bretagne
Provedor de dados: 5
Autores: Blaise, Emmanuel; Suanez, Serge; Stephan, Pierre; Fichaut, Bernard; David, Laurence; Cuq, Veronique; Autret, Ronan; Houron, Julien; Rouan, Mathias; Floc'H, France; Ardhuin, Fabrice; Cancouet, Romain; Davidson, Robert; Costa, Stephane; Delacourt, Christophe.
Between December 2013 and March 2014, a cluster of about 12 storm events hit the coast of Brittany with an exceptional frequency. It was in February that these storm events were the most frequent and particularly virulent. The significant wave heights measured off Finistere reached respectively 12.3 m and 12.4 m during Petra and Ulla storms on February 5 and 14. However, analysis of hydrodynamic conditions shows that only three episodes promoted extreme morphogenetic conditions because they were combined with high spring tide level. The first one occurred on January 1 to 4, it was followed by events from February 1 to 3, and March 2-3. During these three extreme events observed tide levels were above highest astronomical tide level (HAT). Maximum surge...
Tipo: Text
Palavras-chave: Tempête; Érosion; Trait de côte; Marée de vive-eau; Bretagne; Surcote; Storm; High spring tide; Surge; Erosion; Shoreline; Brittany.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00310/42171/43029.pdf

Découverte de la surface d’érosion messinienne onshore/offshore dans deux lieux clés : le Promontoire Baléares (Ibiza) et la marge est-sarde (Orosei)
Provedor de dados: 5
Autores: Maillard, Agnès; Gaullier, Virginie; Lézin, Carine; Chanier, Frank; Odonne, Francis; Lofi, Johanna.
As the Messinian sea-level draw down associated with the Messinian Salinity Crisis is still questioned, we propose to show that the widely spread erosion surface affecting the Mediterranean margins is indeed linked to an exondation demonstrated from offshore and onshore data. Our study presents a comprehensive onshore to offshore correlation of the Messinian erosional surface. It is focused on small drainage systems or interfluve areas, outside of evaporite basins or incised canyons, where the Messinian erosion had not yet been studied previously: around Ibiza on the Balearic Promontory and around Orosei on the Eastern Sardinian margin, Tyrrhenian Basin, both areas where new offshore data were recently acquired. We show that the late Messinian erosion...
Tipo: Text
Palavras-chave: Crise de salinité messinienne; Méditerranée nord-occidentale; Surface d&amp;apos; Érosion; Ibiza; Marge est-sarde; Messinian Salinity Crisis (MSC); Northwestern Mediterranean; Erosion surface; Ibiza; Eastern Sardinian margin.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00622/73392/72608.pdf

Modelling mud transport in a macrotidal estuary
Provedor de dados: 5
Autores: Le Hir, Pierre; Bassoullet, Philippe; L'Yavanc, Jacky.
In order to determine the fate of the fine particles and adsorbed contaminants in·a short macrotidal èstuary, a mathematical modelling system for cohesive suspended mater transport and bottom evolution, including a new consolidation algorithm, is developed. An analysis of successive erosion, transport and deposi~ion processes due to tidal forcing is given and comparisons with field data are provided. A description of mean-term bottom variations has been attempted and is partially validated by differential soundings.
Tipo: Text
Palavras-chave: Dynamique des sédiments cohésifs; Estuaire Morlaix; Tassement des vases; Modèle mathématique; Érosion; Dépôt; Cohesive sediment dynamics; Estuary; Erosion; Deposition; SoiT consolidation; Mathematical modelling.
Ano: 1988
URL: https://archimer.ifremer.fr/doc/00682/79379/81909.pdf

Evolution oligo miocène des marges du micro océan Liguro-Provençal
Provedor de dados: 5
Autores: Bache, François.
The Gulf of Lion margin has been created by an Oligo-Aquitanian rifting followed by oceanic accretion in the Provencal basin during the Burdigalian. Two main periods have been detailed in this thesis:  • The Messinian event that needs to be differentiated from earlier strata deposition. The event also represents a clear marker (between 7 and 5,3 Ma) within the history of the basin.  • The initial period of margin formation, from the beginning of continental extension (35-30 Ma) to oceanisation (around 20 Ma) The database for this study has been built using all available data (seismic and wells from industry) on the shelf, the slope and the deep basin of the Gulf of Lion. The gathering of this huge database occurred in the framework of the French GDRMarges...
Tipo: Text
Palavras-chave: Thermal anomaly; Passive Margins; Subsidence; Rifting; Detritism; Erosion; Salinity Crisis; Miocene; Messinian; Mediterranean; Gulf of Lion; Anomalie thermique; Marges passives; Subsidence; Rifting; Détritisme; Érosion; Crise de salinité; Miocène; Messinien; Méditerranée; Golfe du Lion.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-4768.pdf

Morphodynamique et transferts sédimentaires au sein d'une baie mégatidale en comblement (Baie de Somme, Manche Est). Stratégie multi-échelles spatio-temporelles
Provedor de dados: 5
Autores: Michel, Charlotte.
The Baie de Somme is an infilling estuarine environment, controlled by intensive marine hydrodynamics forcing (megatidal tide and waves) and a small river flow. Morpho-sedimentary dynamics of this bay and sedimentary fluxes were studied at two spatial and temporal scales. I) At the scale of intertidal hydraulic dunes, studied during semi-diurnal and semi-lunar tidal cycles with neap tides (NT) and spring tides (ST). In this context, a strong forcing variability (winds, tide, waves) control sedimentary fluxes and morphodynamics evolutions of dunes (λ : 5-23 m ; H : 20-60 cm). These fluxes generally increase with tide and waves, inducing a net sediment transport to the east or west, according to the predominance of current (flood/ebb), which depends on the...
Tipo: Text
Palavras-chave: Marées; Sédimentation; Sédimentologie; Lutte contre Ensablement; Sédiments des estuaires; Zone intertidale; Littoraux; Érosion; Baie de Somme; Coast; Sedimentology; Silting prevention; Estuarine sediments; Intertidal zone; Tides.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00676/78853/81154.pdf