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Influence of turbulence on bed load sediment transport

Sumer, B. Mutlu, Chua, Lloyd H.C., Cheng, N.S. and Fredsoe, Jorgen. 2003, Influence of turbulence on bed load sediment transport, Journal of hydrologic engineering, vol. 129, no. 8, pp. 585-596, doi: 10.1061/(ASCE)0733-9429(2003)129:8(585).

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Title Influence of turbulence on bed load sediment transport
Author(s) Sumer, B. Mutlu
Chua, Lloyd H.C.ORCID iD for Chua, Lloyd H.C. orcid.org/0000-0003-2523-3735
Cheng, N.S.
Fredsoe, Jorgen.
Journal name Journal of hydrologic engineering
Volume number 129
Issue number 8
Start page 585
End page 596
Total pages 12
Publisher American Society of Civil Engineers
Place of publication Reston, Va.
Publication date 2003
ISSN 1943-7900
Keyword(s) sediments
transport processes
rivers
turbulence
channel flow
Summary This paper summarizes the results of an experimental study on the influence of an external turbulence field on the bed load sediment transport in an open channel. The external turbulence was generated by (1) a horizontal pipe placed halfway through the depth h; (2) a series of grids with a clearance of about one-third of the depth from the bed, and extending over a finite length of the flume; and (3) a series of grids with a clearance in the range (0.1−1.0)h from the bed, but extending over the entire length of the flume. Two kinds of experiments were conducted: plane-bed experiments and ripple-covered-bed experiments. In the former case, the flow in the presence of the turbulence generator was adjusted so that the mean bed shear stress was the same as in the case without the turbulence generator in order to single out the effect of the external turbulence on the sediment transport. In the ripple-covered-bed case, the mean and turbulence quantities of the streamwise component of the velocity were measured, and the Shields parameter, due to skin friction, was determined. The Shields parameter, together with the RMS value of the streamwise velocity fluctuations, was correlated with the sediment transport rate. The sediment transport increases markedly with increasing turbulence level.
Language eng
DOI 10.1061/(ASCE)0733-9429(2003)129:8(585)
Field of Research 099999 Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2003, American Society of Civil Engineers
Persistent URL http://hdl.handle.net/10536/DRO/DU:30063768

Document type: Journal Article
Collection: School of Engineering
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