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Formation of fine sediment deposit from a flash-flood river in the Mediterranean Sea

AutorGrifoll, Manel; Gràcia, Vicenç; Aretxabaleta, Alfredo L. ; Guillén, Jorge ; Espino, Manuel; Warner, John C.
Fecha de publicaciónsep-2014
EditorAmerican Geophysical Union
CitaciónJournal of Geophysical Research: Oceans 119(9): 5837-5853 (2014)
ResumenWe identify the mechanisms controlling fine deposits on the inner-shelf in front of the Besos River, in the northwestern Mediterranean Sea. This river is characterized by a flash flood regime discharging large amounts of water (more than 20 times the mean water discharge) and sediment in very short periods lasting from hours to few days. Numerical model output was compared with bottom sediment observations and used to characterize the multiple spatial and temporal scales involved in offshore sediment deposit formation. A high-resolution (50 m grid size) coupled hydrodynamic-wave-sediment transport model was applied to the initial stages of the sediment dispersal after a storm-related flood event. After the flood, sediment accumulation was predominantly confined to an area near the coastline as a result of preferential deposition during the final stage of the storm. Subsequent reworking occurred due to wave-induced bottom shear stress that resuspended fine materials, with seaward flow exporting them toward the midshelf. Wave characteristics, sediment availability, and shelf circulation determined the transport after the reworking and the final sediment deposition location. One year simulations of the regional area revealed a prevalent southwestward average flow with increased intensity downstream. The circulation pattern was consistent with the observed fine deposit depocenter being shifted southward from the river mouth. At the southern edge, bathymetry controlled the fine deposition by inducing near-bottom flow convergence enhancing bottom shear stress. According to the shortterm and long-term analyses, a seasonal pattern in the fine deposit formation is expected
Descripción17 pages, 10 figures, 3 tables
Versión del editorhttp://dx.doi.org/10.1002/2014JC010187
URIhttp://hdl.handle.net/10261/111831
DOI10.1002/2014JC010187
Identificadoresdoi: 10.1002/2014JC010187
e-issn: 2169-9291
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