|
|
|
|
| |
|
|
| Miramontes Garcia, Elda; Garreau, Pierre; Caillaud, Matthieu; Jouet, Gwenael; Pellen, Romain; Hernández-molina, F. Javier; Clare, Michael A.; Cattaneo, Antonio. |
| Contourites are common morphological features along continental margins where currents encounter the seafloor. They can provide long-term archives of palaeoceanography, may be prone to sediment instability, and can have a great potential for hydrocarbon exploration. Despite their importance and increasingly recognised ubiquitous occurrence worldwide, the link between oceanographic processes and contourite features is poorly constrained. In particular, it is unclear under which specific conditions sediments are mobilised, modified and deposited by bottom currents. Here, we aim to determine key bottom current characteristics (velocity and bottom shear stress) affecting contourite deposition, by assuming that recent oceanographic regimes may be extended back... |
| Tipo: Text |
Palavras-chave: Sediment drift; Erosion; Oceanic circulation; Bottom shear stress. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00483/59426/62241.pdf |
| |
|
| |
|
|
| Dufois, Francois; Garreau, Pierre; Le Hir, Pierre; Forget, P. |
| Simulations of both currents and waves were performed throughout the year 2001 to assess the relative contribution of each to their overall erosive potential on the Gulf of Lions shelf. Statistical analysis of bottom shear stress (BSS) was compared to sediment grain-size distribution on the bottom. The hydrodynamic features of the bottom layer coincide with the distribution of surficial sediments, and three areas with different hydro-sedimentary characteristics were revealed. (i) The sandy inner shelf ( < 30 m) area is a high-energy-wave dominated area but may be subjected to intense current-induced BSS during on-shore winds along the coast and during continental winds mainly in the up-welling cells. (ii) The middle shelf (30-100 m) is a low-energy... |
| Tipo: Text |
Palavras-chave: Gulf of Lions; 3D modelling; Bottom shear stress; Sediment transport. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-6305.pdf |
| |
|
|
|
