The influence of turbulent bursting on sediment resuspension under fluvial unidirectional currents

Article

Salim, Sarik, Pattiaratchi, Charitha, Tinoco, Rafael, Coco, Giovanni, Hetzel, Yasha, Wijeratne, Sarath and Jayaratne, R. 2016. The influence of turbulent bursting on sediment resuspension under fluvial unidirectional currents. Earth Surface Dynamics. 5 (3), pp. 399-415. https://doi.org/10.5194/esurf-5-399-2017
AuthorsSalim, Sarik, Pattiaratchi, Charitha, Tinoco, Rafael, Coco, Giovanni, Hetzel, Yasha, Wijeratne, Sarath and Jayaratne, R.
Abstract

Laboratory experiments were undertaken in a unidirectional current flume in order to examine the role of turbulence on incipient sediment motion. An acoustic Doppler velocimeter was used to measure the instantaneous three-dimensional velocity components and acoustic backscatter (related to suspended sediment concentration). The relationship between wall turbulence (in particular, the "bursting" phenomenon) and resuspension of a non-cohesive sediment bed was examined. The results within a range above and below the measured critical velocity suggested that: 1) the contribution of turbulent bursting events remained identical in both experimental conditions; 2) ejection and sweep events contributed more to the total sediment flux than up-acceleration and down-deceleration events; and 3) wavelet transform revealed a correlation between the momentum and sediment flux in both test conditions. Such similarities in conditions above and below the measured critical velocity highlighted the need to re-evaluate the accuracy of a single time-averaged critical velocity for the initiation of sediment entrainment.

JournalEarth Surface Dynamics
Journal citation5 (3), pp. 399-415
ISSN2196-6311
Year2016
PublisherEuropean Geosciences Union, Copernicus Publications
Accepted author manuscript
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Publisher's version
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Digital Object Identifier (DOI)https://doi.org/10.5194/esurf-5-399-2017
Web address (URL)https://doi.org/10.5194/esurf-5-399-2017
Publication dates
Online19 Jul 2017
Publication process dates
Accepted06 Jun 2017
Deposited07 Feb 2017
FunderUniversity of Western Australia
University of Cantabria, Spain
Natural Hazards Research Platform
The University of Western Australia
University of Cantabria, Spain
Natural Hazards Research Platform
Copyright information© The authors 2016
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