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Sediment transport in a surface-advected estuarine plume.
- Source :
-
Continental Shelf Research . Mar2016, Vol. 116, p122-135. 14p. - Publication Year :
- 2016
-
Abstract
- The interplay between suspended-sediment transport and plume hydrodynamics in a surface-advected estuarine plume is studied using a three-dimensional numerical model. Our analysis focuses on the formation of a sediment-rich alongshore current and on the effect of sediments on the structure of the recirculating freshwater bulge. We introduce the ratio Y between the traveling time of sediment along the bulge edge and the settling timescale. When Y <1, suspended sediments enter the alongshore coastal current. When Y >1 the sediments are deposited within the bulge. We find that a critical range of settling velocities exist above which no transport in the costal current is allowed. Critical settling-velocity values increase with river discharge. Therefore, low magnitude and long-lasting floods promote sediment sorting in the continental shelf. We further find that, for a given flood duration, intermediate flood magnitudes at the limit between subcritical and supercritical flow maximize the alongshore sediment transport. Similarly, for a fixed input of water and sediments, intermediate discharge durations maximize alongshore sediment transport. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SEDIMENT transport
*PLUMES (Fluid dynamics)
*ESTUARIES
*HYDRODYNAMICS
*FLOODS
Subjects
Details
- Language :
- English
- ISSN :
- 02784343
- Volume :
- 116
- Database :
- Academic Search Index
- Journal :
- Continental Shelf Research
- Publication Type :
- Academic Journal
- Accession number :
- 113450586
- Full Text :
- https://doi.org/10.1016/j.csr.2016.01.014