Architecture and morphology of the outer segment of a mixed tide and wave-dominated-incised valley, revealed by HR seismic reflection profiling: the paleo-Charente River, France

Multi time-scale evolution of a wide estuary linear sandbank, the Longe de Boyard, on the French Atlantic coast

“…The elongated sandbank is aligned with the general water flow (Tesson, 1973;. Seismic studies have demonstrated that the Pertuis d'Antioche was a segment of the Charente incised valley (Weber et al, 2004a;Chaumillon and Weber, 2006). To the south, the Marennes-Oléron Bay is the biggest oyster farming area in Europe.…”

“…The reliability of the measurements was checked by testing the rock outcrop stability between each survey . These data were used to quantify the sediment budget of the Longe de Boyard Sandbank following a methodology already used in previous studies of this area of the French Atlantic coast Chaumillon et al, 2002Chaumillon et al, , 2004Weber et al, 2004a) and in other coastal environments Fitzgerald et al, 2004;Pye and Blott, 2006;van der Wal and Pye, 2003;van Maren, 2005).…”

“…EU0 is interpreted as a SB2 sequence boundary formed during previous Quaternary lowstands and reactivated during the last drop in sea-level and subsequent lowstand , Chaumillon and Weber, 2006, Weber et al, 2004a. -Two major bounding surfaces are followed over large (N1 km) distances within the soft sediments lying upon the Mesozoic bedrock.…”

Compound incised-valley characterization by high-resolution seismics in a wave-dominated setting: Example of the Aude and Orb rivers, Languedoc inner shelf, Gulf of Lion, France

“…According to the examples documented by various authors (e.g. Ashley and Sheridan 1994;Kindinger 1988;Kindinger et al 1994;Nichol et al 1994;Lericolais et al 2001;Guttierez et al 2003;Weber et al 2004;Nordfjord et al 2006;Green 2009), the evolution of incised valleys involves an initial phase of river entrenchment and erosion, followed by infilling related to the late Pleistocene relative sea level fall and rise (RSLF and RSLR) events.…”

Suivi environnemental des exploitations de granulats marins au large de la pointe de Chassiron. Contribution à la connaissance de la dynamique sédimentaire dans la zone prélittorale

“…Le gisement de Chassiron (figure 1) est ainsi localisé dans la vallée incisée par la Charente à travers le seuil interinsulaire, relief sous-marin constitué de roches calcaires qui barre l'entrée du pertuis d'Antioche entre les îles de Ré au Nord et d'Oléron au Sud (CRESSARD & AUGRIS, 1977 ;WEBER, 2004 ;WEBER et al, 2004 (CREOCEAN, 2006(CREOCEAN, & 2012. Ce corpus cartographique, unique en terme de superficie et de fréquence des levés apporte des connaissances précises sur l'évolution de la couverture de sédiments meubles superficiels de ce domaine prélittoral soumis à des conditions hydrodynamiques intenses générant une mobilité pratiquement permanente de la fraction sableuse ( IDIER et al, 2006 Les tendances à l'accrétion ou à l'érosion sont alors estimées en fonction de la divergence du vecteur "transport solide".…”