Flow Resistance in Ice-Covered Alluvial Channels
Publication: Journal of Hydraulic Engineering
Volume 123, Issue 7
Abstract
This paper describes the influences of floating level ice covers on flow and bed-load transport in alluvial channels and proposes a semi-empirical procedure for calculating flow resistance in such channels. The procedure can be applied in conjunction with several existing methods for estimating flow resistance in alluvial channels under open-water conditions. Previously, cover influence was poorly understood, with the consequence that flow-resistance calculations for ice-covered alluvial channels entailed an inordinate amount of guesswork. The cover influences described herein were determined from the results of experiments conducted with a laboratory flume. The main findings of the flume experiments are that ice covers increase flow depth, decrease bulk flow velocity, increase dune length, and significantly decrease bed-load transport rate. Additionally, it was found that sediment transport relationships developed for open-water flow are applicable to ice-covered flow provided they are used in conjunction with estimates of actual bed shear stress. The proposed flow-resistance procedure enables such estimates to be made.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 123 • Issue 7 • July 1997
Pages: 592 - 599
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Jul 1, 1997
Published in print: Jul 1997
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