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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/npgd-1-953-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/npgd-1-953-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

  15 May 2014

15 May 2014

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This preprint was under review for the journal NPG. A revision for further review has not been submitted.

Brief Communication: 2-D numerical modeling of the transformation mechanism of a braided channel

Y. Xiao1, S. F. Yang1, X. Shao2, W. X. Chen3, and X. M. Xu3 Y. Xiao et al.
  • 1National Inland Waterway Regulation Engineering Research Center, Chongqing Jiaotong University, Chongqing, 400074, China
  • 2Tsinghua University, State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Beijing, 100084, China
  • 3JHD Holding, Shantou, Guangdong, 515041, China

Abstract. This paper investigates the controls on the transformation mechanism among different channel patterns. A 2-D depth-averaged numerical model is applied to produce the evolution of channel patterns with complex interactions among water flow, sediment transport, and bank erosion. Changes of the variables as discharge, sediment supply, and vegetation are considered in the numerical experiments, leading to the transformation from a braided pattern into a meandering one. What controls the transformation is discussed with the numerical results: vegetation helps stabilize the cut bank and bar surface, but is not a key in the transition; a decrease in discharge and sediment supply could lead a braided pattern to a meandering one. The conclusion is in agreement with various previous field work, confirming the two dimensional model's potential in predicting the transition between different rivers and improving understanding of patterning processes.

Y. Xiao et al.

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Y. Xiao et al.

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