Bed‐Level Variation in Channel Expansions with Movable Beds
Publication: Journal of Irrigation and Drainage Engineering
Volume 120, Issue 6
Abstract
This work presents analytical and numerical models for the analysis of steady‐state bed‐level variation in gradually expanded open channels with movable beds. The analytical model employs the one‐dimensional flow assumption, and equations for flow depth and bed‐level variation have been derived. The numerical model uses a false transient principle with the quasi‐steady uncoupled approach to solve the two‐dimensional governing equations in a transformed coordinate system, which allows an orthogonal grid and an easier inclusion of sidewall boundaries. A second‐order accurate, explicit finite‐difference scheme (Mac‐Cormack scheme) has been used for water flow computation. A comparison between the two shows that the analytical results are comparable to those obtained by the more complicated two‐dimensional numerical model for small expansion angles. Though not discussed in this technical note, the numerical model can be applied to any type of expansion and is capable of predicting the temporal variations of flow depth and bed level.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Bhallamudi, S. M., and Chaudhry, M. H. (1992). “Computation of flows in open channel transitions.” J. Hydr. Res., 30(1), 77–93.
2.
Gill, M. A. (1983). “Diffusion model for aggrading channels.” J. Hydr. Res., 21(5), 355–367.
3.
Lyn, D. A. (1987). “Unsteady sediment transport modeling.” J. Hydr. Engrg., ASCE, 113(1), 1–15.
4.
Nashta, C. F., Garde, R. J., and Swamee, P. K. (1987). “Subcritical flow in open channel expansions with movable bed.” J. Hydr. Res., 25(1), 89–102.
5.
Zhang, H., and Kahawita, R. (1987). “Non‐linear model for aggradation in alluvial channels.” J. Hydr. Engrg., ASCE, 103(3), 913–930.
Information & Authors
Information
Published In
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Apr 26, 1993
Published online: Nov 1, 1994
Published in print: Nov 1994
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.