Effects of Vanes and W-Weir on Sediment Transport in Meandering Channels
Publication: Journal of Hydraulic Engineering
Volume 135, Issue 5
Abstract
Sediment transport patterns in a meandering channel with instream restoration structures (vane and W-weir) have been studied. Laboratory experiments were conducted in a large-scale mobile-bed channel with graded materials under bank-full and overbank flow conditions. Bed-load samples were collected with a calibrated minisampler. Vanes, constructed against the outer bank in a meander bend, relocated the scour hole toward midchannel, thereby protecting the bank from erosion. The sediment sizes in the bend became slightly more coarse and more uniform in the center of the channel. The W-weir installed immediately below a riffle section created two scour holes without affecting the upstream bed or the natural sediment transport of the channel. Predictions of bed-load transport by selected deterministic and stochastic methods showed large deviation from measurements using Helley–Smith sampler in sections downstream of the bend apex. In addition to creating local scour holes, the structures also relocated the locus of sediment transport at downstream sections. This issue should be considered when installing vanes and weirs in meandering rivers with significant bed-load transport.
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Acknowledgments
The writers would like to acknowledge valuable comments from the anonymous reviewers. The first writer expresses his gratitude to Dr. Roger Bettes, HR Wallingford Ltd., U.K. for his support during the experiments. He also benefited from occasional visits by Dr. R. H. J. Sellin and Dr. Loveless from University of Bristol, U.K.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 135 • Issue 5 • May 2009
Pages: 339 - 349
Copyright
© 2009 ASCE.
History
Received: Feb 6, 2006
Accepted: Jan 9, 2009
Published online: May 1, 2009
Published in print: May 2009
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