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Study on Conveyance Coefficient Influenced by Momentum Exchange Under Steady and Unsteady Flows in Compound Open Channels

Author

Listed:
  • Hamidreza Rahimi

    (Hohai University)

  • Saiyu Yuan

    (Hohai University
    Yangtze Institute for Conservation and Development)

  • Xiaonan Tang

    (Xi’an Jiaotong-Liverpool University)

  • Chunhui Lu

    (Hohai University
    Yangtze Institute for Conservation and Development)

  • Prateek Singh

    (Xi’an Jiaotong-Liverpool University)

  • Fariba Ahmadi Dehrashid

    (Bu-Ali Sina University)

Abstract

Many natural compound channels with differential stages play a vital role during high flow events in real-time. When a flood occurs, and water flows into floodplains, the flow structure becomes more complex because of the momentum transfer between sub-segments of the compound channel, caused by the large difference of velocities in different sub-segments. The conventional methods of discharge calculation based on conveyance coefficients of a single channel do not consider momentum transfer, resulting in inaccurate prediction for compound channels. This paper uses a new method of determining conveyance coefficient in compound channels to be incorporated in the two-dimensional analytical solution of the Reynolds averaged Navier–stokes equations for stage-discharge and hydrographs prediction. The proposed conveyance model for flood routing is obtained by solving 1D unsteady flow equations. The flow calculation considers the interaction between sub-segments of compound channels using the momentum equation for shallow water. The proposed model was evaluated to show that incorporating the momentum flux improves the predicted maximum discharge and flow depth in the output hydrographs of the unsteady flow. This result suggests that the proposed method can effectively determine the conveyance coefficient of the compound channel in steady and unsteady flow prediction.

Suggested Citation

  • Hamidreza Rahimi & Saiyu Yuan & Xiaonan Tang & Chunhui Lu & Prateek Singh & Fariba Ahmadi Dehrashid, 2022. "Study on Conveyance Coefficient Influenced by Momentum Exchange Under Steady and Unsteady Flows in Compound Open Channels," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 36(7), pages 2179-2199, May.
    • Handle: RePEc:spr:waterr:v:36:y:2022:i:7:d:10.1007_s11269-022-03130-3
    DOI: 10.1007/s11269-022-03130-3
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    References listed on IDEAS

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    1. Majid Niazkar & Nasser Talebbeydokhti & Seied Hosein Afzali, 2019. "One Dimensional Hydraulic Flow Routing Incorporating a Variable Grain Roughness Coefficient," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 33(13), pages 4599-4620, October.
    2. Pierfranco Costabile & Francesco Macchione, 2012. "Analysis of One-Dimensional Modelling for Flood Routing in Compound Channels," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 26(5), pages 1065-1087, March.
    3. Niranjan Pramanik & Rabindra Panda & Dhrubajyoti Sen, 2010. "One Dimensional Hydrodynamic Modeling of River Flow Using DEM Extracted River Cross-sections," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 24(5), pages 835-852, March.
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    Cited by:

    1. Shriya K. Rathor & Abinash Mohanta & K. C. Patra, 2022. "Validation of Computational Fluid Dynamics Approach of Lateral Velocity Profile Due to Curvature Effect on Floodplain Levee of Two-stage Meandering Channel," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 36(14), pages 5495-5520, November.
    2. Rongqi Zhang & Shanghong Zhang & Xiaoxiong Wen & Zhu Jing, 2023. "Refined Scheduling Based on Dynamic Capacity Model for Short-term Hydropower Generation," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 37(1), pages 21-35, January.

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