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Suspended Sediment transport in the Cap de Creus Submarine Canyon by cascading and storms

Autor Palanques, Albert ; Puig, Pere ; Durrieu de Madron, Xavier; Sánchez-Vidal, Anna; Pasqual, Catalina; Martín, Jacobo ; Calafat, Antoni; Heussner, Serge; Canals, Miquel
Fecha de publicación 4-sep-2012
Citación International Canyons Workshop (2012)
ResumenSignificant sediment transport events to the northwestern Mediterranean basin occur annually during wintertime through the Cap de Creus Submarine Canyon. These events can be caused by severe winter E–SE storms with or without being associated with a dense shelf-water cascading (DSWC) event or by exceptionally intense and persistent DSWC episodes alone. Shelf sediment resuspended by major E-SE storms is more efficiently transported downcanyon when the subsequent storm-induced downwelling occurs together with a DSWC event. Under these conditions, the exported shelf sediment is usually transported to the upper canyon area, where it accumulates temporally. Occasionally, when less frequent and storm-unrelated deep DSWC pulses occur, they resuspend and transport further downslope the sediment from these temporary upper canyon deposits. When erodible sediment of the shelf and the canyon head is exhausted, deep cascading can generate sediment transport increases only from resuspension of these mid-canyon temporary deposits. Beyond the mid canyon, part of the deep dense water plume along with its sedimentary load can leave the canyon confinement and be transported along the southern open mid-slope, whereas some dense water pulses still progress downcanyon towards the continental rise and basin. This is in accordance with the presence of furrows in the CCC down to about 1400 m depth where the canyon section widens and the height of the southern flank drops. These topographic factors added to the reduction of the density excess of the dense water plume may produce a deceleration of the bottom flow, losing part of its erosive capability and coarse sediment load and leaving the canyon confinement. A clear multi-step sediment transport mechanism occurs in this submarine canyon: involving storms and regular DSWC events from the shelf to the upper canyon sector and deep DSWC pulses from the upper canyon to the lower parts of the continental margin
Descripción International Canyons Workshop, 04-06 September 2012, Brest
URI http://hdl.handle.net/10261/95897
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