<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Since accurate estimation of the flow kinetic energy (<italic>α</italic>) and momentum (<italic>β</italic>) is not easily possible in compound channels, determining their accurate correction coefficients is an important task. This paper has used the “flood channel facility (FCF)” data and the “conveyance estimate system (CES)” model (which is 1D, but considers a term related to the secondary flow) to study how the floodplain width and the main channel wall slope and asymmetry affect the values of <italic>α</italic> and <italic>β</italic>. Results have shown that their maximum values at the highest floodplain width are, respectively, 1.36 and 1.13 times of those at the lowest case; an increase in the slope increased their maximum values by 1.05 and 1.01 times, respectively. The mean of error values showed that the CES model estimated the values <italic>α</italic> and <italic>β</italic> more accurately than the flow discharge. The maximum differences between the estimated and experimental values were 12.14% for <italic>α</italic> and 4.3% for <italic>β</italic>; for the flow discharge, it was 24.4%.</p></abstract>

Since accurate estimation of the flow kinetic energy (α) and momentum (β) is not easily possible in compound channels, determining their accurate correction coefficients is an important task. This paper has used the “flood channel facility (FCF)” data and the “conveyance estimate system (CES)” model (which is 1D, but considers a term related to the secondary flow) to study how the floodplain width and the main channel wall slope and asymmetry affect the values of α and β. Results have shown that their maximum values at the highest floodplain width are, respectively, 1.36 and 1.13 times of those at the lowest case; an increase in the slope increased their maximum values by 1.05 and 1.01 times, respectively. The mean of error values showed that the CES model estimated the values α and β more accurately than the flow discharge. The maximum differences between the estimated and experimental values were 12.14% for α and 4.3% for β; for the flow discharge, it was 24.4%.

Compound Channel’s Cross-section Shape Effects on the Kinetic Energy and Momentum Correction Coefficients

Archives of Hydro-Engineering and Environmental Mechanics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Since accurate estimation of the flow kinetic energy (α) and momentum (β) is not easily possible in compound channels, determining their accurate correction...

Compound Channel’s Cross-section Shape Effects on the Kinetic Energy and Momentum Correction Coefficients

Published Online: Jan 29, 2021

Page range: 55 - 71

Received: Oct 26, 2020

Accepted: Dec 13, 2020

DOI: https://doi.org/10.1515/heem-2020-0004

Keywords
CES model, compound channel, FCF, floodplain, kinetic energy correction coefficient, momentum correction coefficient

© 2020 Elham Ghanbari-Adivi, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Compound Channel’s Cross-section Shape Effects on the Kinetic Energy and Momentum Correction Coefficients

Published Online: Jan 29, 2021

Page range: 55 - 71

Received: Oct 26, 2020

Accepted: Dec 13, 2020

DOI: https://doi.org/10.1515/heem-2020-0004

KeywordsCES model, compound channel, FCF, floodplain, kinetic energy correction coefficient, momentum correction coefficient

© 2020 Elham Ghanbari-Adivi, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
CES model, compound channel, FCF, floodplain, kinetic energy correction coefficient, momentum correction coefficient