Influence of Meandering on the Estimation of Velocity and Shear Velocity in Cobble-Bed Channels
Publication: Journal of Hydrologic Engineering
Volume 14, Issue 10
Abstract
Field experiments carried out on five reaches of the meandering cobble-bed Beheshtabad River in central Iran showed that the position of the maximum velocity was independent of the relative submergence ( less or more than 4) and relative curvature (where is the flow depth, is the median diameter of sediment, is the radius of curvature, and is the river width). A new method, called the boundary-layer characteristic method, was employed for the determination of shear velocity. The shear velocity values estimated with this method were in agreement with those obtained using the parabolic law. The law of the wall was valid for low and high relative curvatures in the inner, outer, and central zones of the meandering reaches. However, this law was not suitable for determining the shear velocity for the relative submergence range of due to its high sensitivity to near-bed velocities. Interestingly, it was possible to predict the flow velocity in meandering reaches using the Shields parameter.
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Published In
Journal of Hydrologic Engineering
Volume 14 • Issue 10 • October 2009
Pages: 1126 - 1135
Copyright
© 2009 ASCE.
History
Received: May 10, 2008
Accepted: Feb 20, 2009
Published online: Feb 21, 2009
Published in print: Oct 2009
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