Prediction of the Asymptotic Water Depth in Rough Compound Channels
Publication: Journal of Irrigation and Drainage Engineering
Volume 135, Issue 2
Abstract
We report on a curious result related to the computation of the asymptotic depth in rough compound channels by one-dimensional approaches. Such approaches, which are widely used in practice, utilize one of a number of well-established methods for estimating the equivalent composite/compound roughness. It was found that many of these methods yield predictions of the asymptotic water depth which erroneously depend on the initial, control, depth. Only one of the methods examined was found not to exhibit this unsatisfactory behavior. We explain the results by analysis of the governing equations.
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Acknowledgments
V. S. thankfully acknowledges the support of the ICIST Research Institute from IST, Technical University of Lisbon and of FCT (Foundation for Science and Technology). L. M. thanks the Fulbright Commission for the award of a Fulbright/FLAD research grant.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 135 • Issue 2 • April 2009
Pages: 231 - 234
Copyright
© 2009 ASCE.
History
Received: Feb 9, 2008
Accepted: Sep 2, 2008
Published online: Apr 1, 2009
Published in print: Apr 2009
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