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Modeling Bedload Transport Trajectories along a Sine-Generated Channel

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Abstract

This study explores the influences of flow discharge and particle size on bedload transport trajectory by applying a depth-averaged two-dimensional model to a 110° sine-generated laboratory flume with wide-and-shallow sections. Calculated results exhibit two erosion regions in a bend: Zone-1—oreside of the point bar near the convex bank and Zone-2—near the apex of the concave bank. Sediments eroded from Zone-1 are mainly transported along the same-side convex bank rather than crossing the channel centerline, indicating the crucial role of longitudinal flow in shaping point bars. Most particles from Zone-2, however, behave more complicated by changing their trajectories with the developing bar-pool topography. Besides, sensitivity analyses indicate that, the shifting of bedload trajectory in the curved channel is not susceptible to particle size while considerably varies with flow discharge. Moving particles in a meandering channel are ultimately constrained within the belt of “concave bank‒crossing bar‒concave bank” after the bend topography is fully developed and the bed deformation reaches a dynamic equilibrium.

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FUNDING

This study partially supported by (1) National Key R&D Program of China (2017YFC0405203) (2) National Natural Science Foundation of China (Nos. 51 579 230, 41 571 005, 51 109 198, 51 279 192, 51509234, 51 779 242, and 41 330 751), and the “Hundred Talents Program” of Chinese Academy of Sciences is gratefully acknowledged. This paper does not necessarily reflect the view of the funding agencies.

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Authors and Affiliations

  1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 100101, Beijing, China

    Li He & Dong Chen

  2. Department of Engineering, University of Palermo, Palermo, Italy

    Donatella Termini

  3. National Center for Computational Hydroscience and Engineering, the University of Mississippi, 327 Brevard University, 38677, Oxford, MS, USA

    Yafei Jia & Yaoxin Zhang

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  1. Li He
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Correspondence to Li He, Dong Chen, Donatella Termini, Yafei Jia or Yaoxin Zhang.

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Li He, Chen, D., Termini, D. et al. Modeling Bedload Transport Trajectories along a Sine-Generated Channel. Water Resour 46, 542–552 (2019). https://doi.org/10.1134/S0097807819040134

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