Velocity Distribution in Compound Channel Flows by Numerical Modeling
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Abstract
The paper examines the problem of prediction of uniform turbulent flow in a compound channel with the nonlinear model. This model is capable of predicting the secondary currents, caused by the anisotropy of normal turbulent stresses, that are important features of the flow in compound channels, as they determine the transverse momentum transfer. The model is applied to reproduce experimental runs available in the literature. The comparison shows that the model predicts with accuracy the distribution of the primary velocity component, the secondary circulation, and the discharge distribution. The numerical results are used to search a subdivision surface between main channel and floodplain on the basis of the flow field and to compare different subdivision surfaces on the basis of the discharge distribution by a simple uniform flow formula. The better subdivision surfaces as predicted by the model are the diagonal surface going from the corner between main channel and floodplain to the free surface on the symmetry plane and the bisector of the same corner.
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Published In
Journal of Hydraulic Engineering
Volume 120 • Issue 10 • October 1994
Pages: 1176 - 1198
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Apr 13, 1993
Published online: Oct 1, 1994
Published in print: Oct 1994
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