Research Article
Dec 1977
Minimum Stream Power for Rivers and Deltas
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VIEW THE REPLYPublication: Journal of the Hydraulics Division
Volume 103, Issue 12
Abstract
A numerical model for channel alteration is developed for sand-bed rivers and deltas. The unsteady river flow is computed using the continuity equation and momentum equation of flow with prescribed boundary conditions. Changes in cross-sectional area and delta growth are evaluated based upon the continuity equation for sediment and a sediment transport equation. Subject to certain physical constraints, the part of the river on the delta (delta stream) is assumed to adjust its width freely. To determine the variation in delta stream width, it is assumed to vary in such a way that the total stream power of the river flow is a minimum subject to the physical constraints. The analytical results substantiated with field data indicate that the width-depth ratio of the delta stream tends to increase with a decreasing velocity in an aggrading delta stream, while it tends to decrease with an increasing velocity in a degrading delta stream.
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Published In
Journal of the Hydraulics Division
Volume 103 • Issue 12 • December 1977
Pages: 1375 - 1389
Copyright
© 1977 American Society of Civil Engineers.
History
Published in print: Dec 1977
Published online: Feb 3, 2021
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Authors
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Howard H. Chang, M.ASCE
Prof. and Chm., Civ. Engrg. Dept., San Diego State Univ., San Diego, Calif
Joseph C. Hill, M.ASCE
Prin. Civ. Engr., Dept. of Sanitation and Flood Control, County of San Diego, San Diego, Calif
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
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