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Sandbars in alluvial channels: their formation processes and interaction with groins

Sandbars in alluvial channels: their formation processes and interaction with groins Large sandbars resulted from the instability of loose sedimentary materials are very common in lowland rivers. These, not only, interrupt the inland waterways at low flow, but also make the channels highly unstable forming anabranches, influencing bank erosion, and so on. Groins have key roles to play in such cases. Formation processes of sandbars and their interactions with groins become very urgent to learn for better management of river engineering. RIC-Nays, a two-dimensional model for flow and morphology, is utilized in this study. Computation results reveal that different initial conditions lead to different equilibrium states, and periodic boundary conditions with a small computation domain tend to stabilize multiple bars. Intrusion of groins accelerates the flow in the main channel, which triggers the sediment movement there. Thus the bars move downstream reducing their scale and finally they disappear from the main channel. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png World Journal of Engineering Emerald Publishing

Sandbars in alluvial channels: their formation processes and interaction with groins

Alauddin, M.; Tsujimoto, T.
World Journal of Engineering , Volume 11 (5): 8 – Nov 1, 2014
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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
1708-5284
DOI
10.1260/1708-5284.11.5.473
Publisher site
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Abstract

Large sandbars resulted from the instability of loose sedimentary materials are very common in lowland rivers. These, not only, interrupt the inland waterways at low flow, but also make the channels highly unstable forming anabranches, influencing bank erosion, and so on. Groins have key roles to play in such cases. Formation processes of sandbars and their interactions with groins become very urgent to learn for better management of river engineering. RIC-Nays, a two-dimensional model for flow and morphology, is utilized in this study. Computation results reveal that different initial conditions lead to different equilibrium states, and periodic boundary conditions with a small computation domain tend to stabilize multiple bars. Intrusion of groins accelerates the flow in the main channel, which triggers the sediment movement there. Thus the bars move downstream reducing their scale and finally they disappear from the main channel.

Journal

World Journal of Engineering – Emerald Publishing

Published: Nov 1, 2014

References

  • Studies on bed load transportation for nonuniform sediment and river bed variation
    K. Ashida
  • Brahmaputra River: channel processes and sedimentation
    J. Coleman
  • Finite amplitude alternate bars
    M. Colombini
  • Flow and bed topography in channel bends
    F. Engelund
  • Studies on the process of development of alternate bars
    Y. Fujita
  • Bar and channel formation in braided streams, River meandering
    Y. Fujita