Skip to Main content Skip to Navigation
Journal articles

On the determination of the settling flux of cohesive sediments in a turbulent fluid

Abstract : In this paper we compare the settling flux of a cohesive sediment mixture measured in a quiescent fluid with that achieved in a turbulent flow. Experiments were performed in a mixing tank. The turbulence produced mechanically by an oscillating grid maintains a stationary, highly concentrated fluid mud layer in which the concentration is almost uniform. In this layer the turbulence decay with increasing distance from the grid is similar to that obtained in clear water. For steady conditions the settling flux of the fluid mud mixture is balanced by the upward turbulent flux, and its value can be determined from the measured depth of the fluid mud layer. At high concentrations (10–200 g L−1), we show that the settling flux in a turbulent fluid is much larger than estimated in a quiescent fluid (up to two orders of magnitude). Hindering effects in the settling process of cohesive sediments may thus be considerably reduced by turbulence.
Complete list of metadatas

Cited literature [36 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-00260292
Contributor : Legi Correspondant Hal 2 <>
Submitted on : Thursday, February 13, 2020 - 5:38:09 PM
Last modification on : Thursday, July 9, 2020 - 9:43:51 AM
Document(s) archivé(s) le : Thursday, May 14, 2020 - 5:10:43 PM

File

Gratiot2005.pdf
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Collections

Citation

Nicolas Gratiot, Hervé Michallet, Mathieu Mory. On the determination of the settling flux of cohesive sediments in a turbulent fluid. Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2005, 110 (C6), pp.C06004. ⟨10.1029/2004JC002732⟩. ⟨hal-00260292⟩

Share

Metrics

Record views

344

Files downloads

134