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| Gregoire, Gwendoline; Le Roy, Pascal; Ehrhold, Axel; Jouet, Gwenael; Garlan, Thierry. |
| This study details the sedimentary infilling of an original tidal-dominated estuary system during the final stage of the last marine transgression. The Bay of Brest is confined and connects the rivers Elorn and Aulne, to the sea of Iroise by a narrow strait encasing a well preserved paleo-channel. The compilation of high- and very-high-resolution bathymetric and seismic data, constrained by sediments datations, allows us to classify the paleo-morphology of the bay into three stepped domains: the paleo-valley floor surrounded by fluvial terraces, the central plateau, and the shallow embayments. Taking into account the main factors controlling the infilling, including sea-level rise, substratum morphology, and hydrodynamics, the stratigraphic scheme of the... |
| Tipo: Text |
Palavras-chave: Tide-dominated estuary; Incised-valley; Holocene infill; Seismic stratigraphy; Estuarine processes; Bay of Brest. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00358/46968/46883.pdf |
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| Moskalski, Susanne; Floc'H, France; Verney, Romaric. |
| Residual suspended sediment flux in estuaries is dependent on water level, velocity, and suspended sediment concentration (SSC), but complex interactions between these variables and other forcing mechanisms can lead to drastic differences in the magnitude and direction of sediment flux. The goal of this study was to quantify residual suspended sediment flux in a shallow, macrotidal estuary, and to determine its most important forcing mechanisms, using the Dyer flux decomposition equation and a simplified analytical model. Water level, velocity, and acoustic backscatter were measured in the Aulne River estuary in Brittany, France, and acoustic backscatter converted to SSC. The vertical tide was slightly flood dominant near the mouth, but strongly flood... |
| Tipo: Text |
Palavras-chave: Estuaries; Estuarine processes; Sediment flux decomposition; Brittany; Europe. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00588/70046/67981.pdf |
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