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2D numerical modelling of meandering channel formation

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Abstract

A 2D depth-averaged model for hydrodynamic sediment transport and river morphological adjustment was established. The sediment transport submodel takes into account the influence of non-uniform sediment with bed surface armoring and considers the impact of secondary flow in the direction of bed-load transport and transverse slope of the river bed. The bank erosion submodel incorporates a simple simulation method for updating bank geometry during either degradational or aggradational bed evolution. Comparison of the results obtained by the extended model with experimental and field data, and numerical predictions validate that the proposed model can simulate grain sorting in river bends and duplicate the characteristics of meandering river and its development. The results illustrate that by using its control factors, the improved numerical model can be applied to simulate channel evolution under different scenarios and improve understanding of patterning processes.

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Acknowledgements

This research is supported by the National Natural Science Foundation of China (51409027), the Science and Technology Research Foundation of Chongqing Municipal Education Commission (Grant No. KJ1500502).

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Authors and Affiliations

  1. National Inland Waterway Regulation Engineering Research Center, Chongqing Jiaotong University, Chongqing, China

    Y XIAO & F S YANG

  2. Chinese Research Academy of Environmental Sciences, Beijing, China

    G ZHOU

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  1. Y XIAO
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  2. G ZHOU
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  3. F S YANG
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Correspondence to Y XIAO.

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XIAO, Y., ZHOU, G. & YANG, F.S. 2D numerical modelling of meandering channel formation. J Earth Syst Sci 125, 251–267 (2016). https://doi.org/10.1007/s12040-016-0662-5

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  • DOI: https://doi.org/10.1007/s12040-016-0662-5

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