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Kinetic energy and momentum correction coefficients in compound open channels

Author

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  • Alireza Keshavarzi

    (Western Sydney University
    Shiraz University)

  • Hossein Hamidifar

    (Shiraz University)

Abstract

Flood management is fundamentally unresolved in nature due to several sources of unreliability including parameter uncertainty. Applying inappropriate values for the kinetic energy and momentum correction coefficients (usually named α and β, respectively) can lead to considerable error in the calculation of water surface profiles, critical depth and energy losses in rivers. Due to the strong variations in the streamwise velocity, the values of α and β across compound open channels differ from those in a simple open channel. In this paper, the variations of α and β coefficients are investigated across the main channel and floodplain of two different shapes of compound open channel (rectangular and trapezoidal). Also, variations of these coefficients against the relative flow depth (the ratio of floodplain to main channel flow depths) are discussed. The results show that the values of α and β in the main channel are always lower than those over the floodplain. As flow relative depth increases, the hydraulic behavior of the compound channel tends to that of a simple channel.

Suggested Citation

  • Alireza Keshavarzi & Hossein Hamidifar, 2018. "Kinetic energy and momentum correction coefficients in compound open channels," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 92(3), pages 1859-1869, July.
  • Handle: RePEc:spr:nathaz:v:92:y:2018:i:3:d:10.1007_s11069-018-3285-0
    DOI: 10.1007/s11069-018-3285-0
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    References listed on IDEAS

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    1. Majid Mirzaei & Yuk Huang & Ahmed El-Shafie & Tayebeh Chimeh & Juneseok Lee & Nariman Vaizadeh & Jan Adamowski, 2015. "Uncertainty analysis for extreme flood events in a semi-arid region," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 78(3), pages 1947-1960, September.
    2. Beihan Jiang & Kejun Yang & Shuyou Cao, 2015. "An Analytical Model for the Distributions of Velocity and Discharge in Compound Channels with Submerged Vegetation," PLOS ONE, Public Library of Science, vol. 10(7), pages 1-17, July.
    3. Eung Kim & Hyun Choi, 2015. "A method of flood severity assessment for predicting local flood hazards in small ungauged catchments," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 78(3), pages 2017-2033, September.
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