Unstable Patterns in Partly Vegetated Channels
Publication: Journal of Hydraulic Engineering
Volume 122, Issue 11
Abstract
Unstable patterns are identified in the results of numerical simulations of two cases of partly vegetated open channels, at the free unobstructed flow side of the shear layer that separates the unobstructed channel from the vegetated zones. A time-dependent pattern was identified in a rectangular open channel compound with a vegetated bank, and cellular structure was found in a wide rectangular open channel spanning over a vegetated thin layer at the channel bed. Distinction between three modes of algebraic stress models: a prompt algebraic stress model, a delayed algebraic stress model, and an algebraic stress model with longitudinal vorticity sources relaxation, and the modeling of time-dependent turbulence is made, and discussed in the present context.
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References
1.
Naot, D., Nezu, I., and Nakagawa, H.(1993). “Hydrodynamic behaviour of compound rectangular open channels.”J. Hydr. Engrg., ASCE, 119(3), 390–408.
2.
Naot, D., Nezu, I., and Nakagawa, H. (1994). “Towards the modelling of the hydrodynamic forces in compound open channel with vegetated flood plain.”Proc., Hydr. Engrg., JSCE, Tokyo, Japan, Vol. 38, 437–442.
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Naot, D., Nezu, I., and Nakagawa, H. (1996). “Hydrodynamic behavior of partly vegetated open channel.”J. Hydr. Engrg., 122(11), 625– 633.
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Naot, D., and Rodi, W.(1982). “Calculation of secondary currents in channel flow.”J. Hydr. Engrg., ASCE, 108(8), 948–968.
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Tsujimoto, T., and Kitamura, T. (1992). “Appearance of organized fluctuations in open channel flow with vegetated zone.”KHL Progressive Rep., Hydr. Lab., Kanazawa Univ., Kanazawa, Japan, Dec., 37–45.
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Published In
Journal of Hydraulic Engineering
Volume 122 • Issue 11 • November 1996
Pages: 671 - 673
Copyright
Copyright © 1996 American Society of Civil Engineers.
History
Published online: Nov 1, 1996
Published in print: Nov 1996
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