Preprints
https://doi.org/10.5194/hess-2024-74
https://doi.org/10.5194/hess-2024-74
13 Mar 2024
 | 13 Mar 2024
Status: this preprint is currently under review for the journal HESS.

Apparent Friction Coefficient Used for Flow Calculation in Straight Compound Channels With Trees On Floodplains

Adam Kozioł, Adam Kiczko, Marcin Krukowski, Elżbieta Kubrak, Janusz Kubrak, Grzegorz Majewski, and Andrzej Brandyk

Abstract. The interaction of water streams in channels with a complex cross-section, involving the exchange of water mass and momentum between slowly-flowing water in the floodplains and fast water in the main channel, significantly depends on the diversification of the surface roughness between the main channel and floodplains. Additionally, trees strongly increase flow resistance on floodplains, but also significantly in the main channel by intensifying the interaction process. As a result, the water velocity and the discharge capacity of both parts of the channel decrease and at the same time, affecting the flow conditions in the main channel. The results of laboratory experiments were used to determine the effect of floodplain trees on the discharge capacity of the channel with diversified roughness. The reduction in velocity of the main channel caused by the stream interactions is described with the apparent friction coefficients introduced at the boundary between the main channel and the floodplain. The values of resistance coefficients and their changes as a result of the significant influence of trees on the interaction process were determined for various roughness’s of the main channel bottom.

Adam Kozioł, Adam Kiczko, Marcin Krukowski, Elżbieta Kubrak, Janusz Kubrak, Grzegorz Majewski, and Andrzej Brandyk

Status: open (until 12 May 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2024-74', Anonymous Referee #1, 26 Mar 2024 reply
    • AC1: 'Reply on RC1', Adam Kozioł, 27 Mar 2024 reply
      • RC2: 'Reply on AC1', Anonymous Referee #1, 04 Apr 2024 reply
        • AC2: 'Reply on RC2', Adam Kozioł, 05 Apr 2024 reply
Adam Kozioł, Adam Kiczko, Marcin Krukowski, Elżbieta Kubrak, Janusz Kubrak, Grzegorz Majewski, and Andrzej Brandyk
Adam Kozioł, Adam Kiczko, Marcin Krukowski, Elżbieta Kubrak, Janusz Kubrak, Grzegorz Majewski, and Andrzej Brandyk

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Short summary
Floodplain trees play a crucial role in increasing flow resistance. Their impact extends beyond floodplains to affect the main channel. The experiments reveal the influence of floodplain trees on the discharge capacity of channels with varying roughness. We determine resistance coefficients for different roughness levels of the main channel bottom. The research contributes to a deeper understanding of open-channel flow dynamics and has practical implications for river engineering.