Aggradation‐Degradation Process in Alluvial Channels
Publication: Journal of Hydraulic Engineering
Volume 118, Issue 12
Abstract
The effects of sediment size gradation and sediment loading ratio m on the aggradation‐degradation process and related flow characteristics in an alluvial channel were investigated experimentally. Three different size gradations of sediment were used. For each gradation, experiments were carried out for four different sediment loading conditions, namely, initial equilibrium, overloading, underloading, and clear water. Hydraulic characteristics, sediment transport rates, and gradations were measured during experiments. A linear model of sediment transport under overloading and underloading conditions was developed. Experimental results show that with nonuniform sediment, the aggradation‐degradation cycle is found to be irreversible. Under a given loading ratio, speeds of the aggradation wave and degradation wave increase with increasing and with decreasing m. The recovery ratios of bed elevation and bed slope decrease as increases. Regression relations have also been derived from the experimental data obtained.
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Information & Authors
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Published In
Journal of Hydraulic Engineering
Volume 118 • Issue 12 • December 1992
Pages: 1651 - 1669
Copyright
Copyright © 1992 ASCE.
History
Published online: Dec 1, 1992
Published in print: Dec 1992
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