This study examines the problem of flow resistance due to rigid vegetation in open channel flow. The reliability of the conventional flow resistance equations (i.e. Keulegan, Manning and Chézy-Bazin) for vegetated flows at high submergence, i.e. h/k >5, (where h = flow depth and k = vegetation height) is assessed. Several modern flow resistance equations based on a two-layer approach are examined, showing that they transform into the conventional equations at high submergences. To compare the conventional flow resistance equations at high submergences, an experimental methodology is proposed and applied to the experimental data reported in the literature and collected for this study. The results demonstrate the reliability of the Keulegan equation in predicting the flow resistance. Based on the obtained results, a model to evaluate the Nikuradse equivalent sand-grain roughness, kN, starting from the vegetation height and density, is proposed and tested.

Use of conventional flow resistance equations and a model for the Nikuradse roughness in vegetated flows at high submergence / Gualtieri, Paola; DE FELICE, Sergio; Pasquino, Vittorio; PULCI DORIA, Guelfo. - In: JOURNAL OF HYDROLOGY AND HYDROMECHANICS. - ISSN 0042-790X. - 66:1(2018). [10.1515/johh-2017-0028]

Use of conventional flow resistance equations and a model for the Nikuradse roughness in vegetated flows at high submergence

Paola Gualtieri
Membro del Collaboration Group
;
Sergio De Felice
Membro del Collaboration Group
;
Vittorio Pasquino
Membro del Collaboration Group
;
Guelfo Pulci Doria
Membro del Collaboration Group
2018

Abstract

This study examines the problem of flow resistance due to rigid vegetation in open channel flow. The reliability of the conventional flow resistance equations (i.e. Keulegan, Manning and Chézy-Bazin) for vegetated flows at high submergence, i.e. h/k >5, (where h = flow depth and k = vegetation height) is assessed. Several modern flow resistance equations based on a two-layer approach are examined, showing that they transform into the conventional equations at high submergences. To compare the conventional flow resistance equations at high submergences, an experimental methodology is proposed and applied to the experimental data reported in the literature and collected for this study. The results demonstrate the reliability of the Keulegan equation in predicting the flow resistance. Based on the obtained results, a model to evaluate the Nikuradse equivalent sand-grain roughness, kN, starting from the vegetation height and density, is proposed and tested.
2018
Use of conventional flow resistance equations and a model for the Nikuradse roughness in vegetated flows at high submergence / Gualtieri, Paola; DE FELICE, Sergio; Pasquino, Vittorio; PULCI DORIA, Guelfo. - In: JOURNAL OF HYDROLOGY AND HYDROMECHANICS. - ISSN 0042-790X. - 66:1(2018). [10.1515/johh-2017-0028]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/704535
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