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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union

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doi:10.5194/npgd-1-953-2014
© Author(s) 2014. This work is distributed
under the Creative Commons Attribution 3.0 License.
Brief communication
15 May 2014
Review status
A revision of this discussion paper 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 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.

Citation: Xiao, Y., Yang, S. F., Shao, X., Chen, W. X., and Xu, X. M.: Brief Communication: 2-D numerical modeling of the transformation mechanism of a braided channel, Nonlin. Processes Geophys. Discuss., 1, 953-975, doi:10.5194/npgd-1-953-2014, 2014.
Y. Xiao et al.
Interactive discussionStatus: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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RC C654: 'Comments', Anonymous Referee #1, 28 Nov 2014 Printer-friendly Version 
 
RC C668: 'review and editorial closing comment', Andreas Baas, 05 Dec 2014 Printer-friendly Version 
Y. Xiao et al.
Y. Xiao et al.

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