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Received: 2016-10-06

Revision Accepted: 2017-01-13

Crosschecked: 2017-10-10

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Wan Hanna Melini Wan Mohtar


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Journal of Zhejiang University SCIENCE A 2017 Vol.18 No.11 P.882-894


Enhanced understanding on incipient sediment motion and sediment suspension through oscillating-grid turbulence experiments

Author(s):  Wan Hanna Melini Wan Mohtar

Affiliation(s):  Department of Civil & Structural Engineering, University Kebangsaan Malaysia, Bandar Baru Bangi 43600, Malaysia

Corresponding email(s):   hanna@ukm.edu.my

Key Words: 

Wan Hanna Melini Wan Mohtar. Enhanced understanding on incipient sediment motion and sediment suspension through oscillating-grid turbulence experiments[J]. Journal of Zhejiang University Science A, 2017, 18(11): 882-894.

@article{title="Enhanced understanding on incipient sediment motion and sediment suspension through oscillating-grid turbulence experiments",
author="Wan Hanna Melini Wan Mohtar",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Enhanced understanding on incipient sediment motion and sediment suspension through oscillating-grid turbulence experiments
%A Wan Hanna Melini Wan Mohtar
%J Journal of Zhejiang University SCIENCE A
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%N 11
%P 882-894
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%D 2017
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1600659

T1 - Enhanced understanding on incipient sediment motion and sediment suspension through oscillating-grid turbulence experiments
A1 - Wan Hanna Melini Wan Mohtar
J0 - Journal of Zhejiang University Science A
VL - 18
IS - 11
SP - 882
EP - 894
%@ 1673-565X
Y1 - 2017
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1600659

Sediment dynamics are usually described in terms of the studies developed under a steady uniform flow, where the hydrodynamic forces are taken those pertaining to the mean time-averaged flow speed. However, the inherent turbulence plays an important role and should be considered implicitly in describing the complexity of turbulence effects in geophysical phenomena. This paper reviews the implementation of isolated turbulence, generated by oscillating grid on two important sediment transport phenomena, i.e., incipient sediment motion and suspension. The generated quasi-isotropic, laterally homogenous turbulence (that is, at a distance further away from the grid) permits an in-depth investigation of the effect of turbulent fluctuations and brings new insights in understanding both phenomena. The critical Shields profile for the incipient sediment motion characterized using the second order of turbulence statistics is qualitatively similar to the Shields curve obtained under a steady uniform flow. In the suspension of particles, there is a two-way interaction between sediment and turbulence. High concentration of suspended particles changes the turbulence structure and the presence of coherent vortices changes the particle settling velocity, which subsequently alters the concentration within the suspension layer. The studies of turbulence on incipient sediment motion and particle suspension provide a better understanding of the underlying physics of sediment behavior at the near-bed region.

This paper discusses the way data from grid turbulence experiments can be used to understand sediment suspension and resuspension. The author analyses data he has obtained for suspension under controlled turbulence conditions in the absence of horizontal flow, and compares the suspension criterion so obtained with criteria obtained form experiments with net horizontal flow.



Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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