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Comparison of Morphodynamic Models for the Lower Yellow River

Authors

  • Junqiang Xia,

    1. Respectively, Professor (Xia), State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, No. 8, Donghu South Road, Wuhan 430072, China
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  • Zhengbing Wang,

    1. Professor (Wang), Delft University of Technology, Faculty of Civil Engineering and Geosciences, 2600 GA Delft, The Netherlands; and Senior Engineer (Wang) and Professor (Yu), Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China
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  • Yanping Wang,

    1. Professor (Wang), Delft University of Technology, Faculty of Civil Engineering and Geosciences, 2600 GA Delft, The Netherlands; and Senior Engineer (Wang) and Professor (Yu), Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China
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  • Xin Yu

    1. Professor (Wang), Delft University of Technology, Faculty of Civil Engineering and Geosciences, 2600 GA Delft, The Netherlands; and Senior Engineer (Wang) and Professor (Yu), Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China
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    • Paper No. JAWRA-11-0126-P of the Journal of the American Water Resources Association (JAWRA). Discussions are open until six months from print publication.


(E-Mail/Xia: xiajq@whu.edu.cn).

Abstract

Xia, Junqiang, Zhengbing Wang, Yanping Wang, and Xin Yu, 2012. Comparison of Morphodynamic Models for the Lower Yellow River. Journal of the American Water Resources Association (JAWRA) 1-18. DOI: 10.1111/jawr.12002

Abstract:  Significant channel adjustments often occur during flood seasons in the Lower Yellow River (LYR), and it is a challenging work to accurately simulate the morphodynamic processes in the LYR using numerical models. A comparison of two morphodynamic models (Delft3D and 2DLLCDM) for the LYR is presented herein to identify critical improvements for these models. The concepts of these models are first compared with each other. The models were then used to simulate the processes of flood routing, sediment transport, and morphological changes occurring in a braided reach of the LYR. The differences were investigated between the simulated results from these models and corresponding field measurements, and the results indicate that: (1) the hydrodynamic processes calculated by both models agree closely with the measurements if an appropriate Manning’s roughness coefficient is used; (2) the concentrations of suspended load at the downstream boundary calculated by the models agree reasonably with the observed data; and (3) the predicted cross-sectional profiles obtained from these models do not correspond well with the measurements. Based on these findings, the weak aspects of the models are clarified, and three critical improvements are recommended, including: (1) the development of roughness predictor; (2) the refinement of graded sediment transport capacity formulation; and (3) the consideration of bank erosion module. These improvements need to be implemented in the future.

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