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Title

Sediment delivery, resuspension, and transport in two contrasting canyon environments in the southwest Gulf of Lions

AuthorsOgston, Andrea S.; Drexler, Tina M.; Puig, Pere CSIC ORCID
KeywordsSediment transport
Gulf of Lions
Dense-water cascading
Sediment resuspension
Canyon
Sedimentation
Issue Date30-Aug-2008
PublisherElsevier
CitationContinental Shelf Research 28(15): 2000-2016 (2008)
AbstractMultiple canyons incise the continental slope at the seaward edge of the continental shelf in the Gulf of Lions and are actively involved in the transfer of sediment from shelf to deep sea. Two canyons in the southwest region of the Gulf of Lions, Lacaze-Duthiers Canyon and Cap de Creus Canyon, were instrumented with bottom-boundary-layer tripods in their heads to evaluate the processes involved in sediment delivery, resuspension and transport. In both canyons, intense cold, dense-water flows carry sediment across the slope. In the Lacaze-Duthiers canyon head (located ∼35 km from the shoreline), dense-water cascading into the canyon was episodic. Currents were highly variable in the canyon head, and responded to interactions between the along-slope Northern Current and the sharp walls of the canyon. Inertial and other high-frequency fluctuations were associated with suspended-sediment concentrations of ∼5mg/l. In Cap de Creus canyon head (located ∼14km from the shoreline), downslope currents were higher in magnitude and more persistent than in Lacaze-Duthiers canyon head. Greater suspended-sediment concentrations (peaks up to 20mg/l) were observed in Cap de Creus Canyon due to resuspension of the canyon seabed during dense-water cascading events. The similarities and contrasts between processes in these two canyon heads emphasize the importance of the interaction of currents with sharp canyon bathymetry. The data also suggest that cold, dense-water flows have more potential to carry sediment to the slope on narrow shelves, and may more efficiently transfer that sediment to the deep sea where a smooth transition between shelf and slope exists
DescriptionSpecial issue Sediment Dynamics in the Gulf of Lions; the Impact of Extreme Events.-- 17 pages, 11 figures
Publisher version (URL)https://doi.org/10.1016/j.csr.2008.02.012
URIhttp://hdl.handle.net/10261/25602
DOI10.1016/j.csr.2008.02.012
ISSN0278-4343
Appears in Collections:(ICM) Artículos

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