Overbank Flow in Symmetrically Narrowing Floodplains
Publication: Journal of Hydraulic Engineering
Volume 130, Issue 4
Abstract
Experimental data are presented for flow in compound channels with symmetrically narrowing floodplains. In such a geometry, the flow behavior presents similarities with the more complex flow in a meandering compound channel, yet without the curvature effects, because of mass transfers between the floodplains and the main channel, and secondary currents induced in the main channel. An estimation of the momentum transfer generated by the mass transfer is found significant compared to the frictional losses. It mainly depends on the geometrical parameters and is practically independent of the friction slope. Free-surface profile computations are performed with the exchange discharge model (EDM) to incorporate the effects of the momentum transfer in terms of an additional head loss. Agreement was found between measured and computed water surfaces, thus validating the EDM approach.
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Information
Published In
Journal of Hydraulic Engineering
Volume 130 • Issue 4 • April 2004
Pages: 305 - 312
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Nov 1, 2001
Accepted: Aug 18, 2003
Published online: Mar 15, 2004
Published in print: Apr 2004
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