Measurement of velocity-lag of suspended-sediment particles in turbulent open-channel flows

Kwonkyu Yu; Marian Muste; Robert Ettema; Byungman Yoon

doi:10.3741/JKWRA.2006.39.2.099

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Measurement of velocity-lag of suspended-sediment particles in turbulent open-channel flows

Journal article

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Measurement of velocity-lag of suspended-sediment particles in turbulent open-channel flows

Kwonkyu Yu, Marian Muste, Robert Ettema and Byungman Yoon

Journal of Korea Water Resources Association, Vol.39(2), pp.99-108

02/2006

DOI: 10.3741/JKWRA.2006.39.2.099

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Abstract

To describe the behavior of suspended-sediment particles in turbulent open-channel flows, the advection-diffusion equation or its simplified form has been used. Though this equation was derived upon several assumptions, only a few studies tried to evaluate the limit of the assumptions. The reason is that it is very difficult to measure turbulence in open-channel flows and to discriminate the velocities of water and sediment particles. The present study aims to measure the velocity profiles of water and sediment particles in open-channel flows by using PTV (Particle Tracking Velocimetry), a kind of PIV (Particle Image Velocimetry). The measured results showed that sediment particles moved slower than water tracers did in the outer region. In the present study, the amount of velocity-lag reached about 5% of the mean flow velocity and the position of the maximum velocity-lag was y/h nearly equal 0.05 (y (super +) = 30-50). The main cause of the velocity-lag of sediment particles seems that the sediment particles have larger density than water has. On the other hand, in the viscous sublayer, sediment particle has a larger velocity than water tracers. The reason of the inversion of velocity-lag may be due to the no-sleep condition of water at the solid boundaries.

Hydrogeology

Hydrology

Turbulence

channels

experimental studies

flows

flume studies

fluvial sedimentation

measurement

particles

rivers and streams

sediment transport

sedimentation

stream transport

suspended materials

velocimetry

velocity

Details

Title: Subtitle: Measurement of velocity-lag of suspended-sediment particles in turbulent open-channel flows
Creators: Kwonkyu Yu - Iowa Institute of Hydraulic Research Iowa City, IA USA United States
Marian Muste
Robert Ettema
Byungman Yoon
Resource Type: Journal article
Publication Details: Journal of Korea Water Resources Association, Vol.39(2), pp.99-108
DOI: 10.3741/JKWRA.2006.39.2.099
ISSN: 1226-6280
eISSN: 2287-6138
Publisher: Korea Water Resources Association
Language: English; Korean
Date published: 02/2006
Academic Unit: IIHR--Hydroscience and Engineering; Geographical and Sustainability Sciences
Record Identifier: 9984479360502771

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