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Depth averaged velocity and stage-discharge relationships in compound channels with composite roughness

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Abstract

The present study discusses and analyses the influence of composite roughness on the stage-discharge relationships and flow characteristics in compound channels with different channel roughness. An analytical solution to predict depth-averaged velocity, non-dimensional coefficient, integration constants and composite roughness is developed by considering the shear forces acting on the channel beds and walls. The model was applied to three different new experiments and two previous experiments. It indicates that the composite roughness is the key flow resistance parameter that influences the depth-averaged velocity, boundary shear stress distributions, and stage-discharge relationships. The result shows that, in a rough bed, the boundary shear stress in the floodplain was significantly higher than in a heterogeneous and smooth bed. The error analysis is also discussed, and the present model error is the least. Thus, the present analytical solution gives a good prediction of the stage-discharge relationships when compared with experimental data.

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Data is available by request to the author.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, Wayne State University, Detroit, USA

    Ebissa Gadissa Kedir

  2. Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee, India

    C. S. P. Ojha & K. S. Hari Prasad

Authors
  1. Ebissa Gadissa Kedir
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  2. C. S. P. Ojha
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  3. K. S. Hari Prasad
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Contributions

Ebissa Gadissa Kedir: Conceptualization, Writing—original draft and Formal analysis, Ebissa Gadissa Kedir and CSP Ojha: Methodology and Investigation, CSP Ojha, and K.S. Hari Prasad: Supervision, All Authors contributed to Validation and Writing – review and editing.

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Correspondence to Ebissa Gadissa Kedir.

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Kedir, E.G., Ojha, C.S.P. & Hari Prasad, K.S. Depth averaged velocity and stage-discharge relationships in compound channels with composite roughness. Environ Fluid Mech (2024). https://doi.org/10.1007/s10652-024-09987-9

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  • DOI: https://doi.org/10.1007/s10652-024-09987-9

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