A theoretical analysis of the fluid-solid interactions governing the removal of woody debris jams from cylindrical bridge piers
A theoretical analysis of the fluid-solid interactions governing the removal of woody debris jams from cylindrical bridge piers
This paper proposes a theoretical model to describe previous laboratory observations of the dynamics of debris accumulations around bridge piers of cylindrical shape. The model is based on the assumption that the observed dynamics is mainly governed by dynamic changes of the point of application of the drag force exerted on a solid body formed by debris accumulated around a pier. A phase-plane analysis of the resulting nonlinear system of ordinary differential equations shows that the model captures the main patterns observed in previous laboratory experiments, including an oscillatory motion and the removal of debris from the pier by the flow. The model provides a theoretical basis for the analysis of the conditions required for debris jams to remain stable over long periods of exposure to impinging flow. Namely, the model indicates that the stability of debris accumulations primarily depends on geometrical asymmetry and on the length of the extension downstream of the pier. The former induces the torque required to rotate the jam about the pier, while the latter produces a stabilising effect after the body rotates.
hydraulics, river dynamics
Panici, Diego
2e32ed2c-3d44-46e4-9a4a-e5935050539a
De Almeida, Gustavo
f6edffc1-7bb3-443f-8829-e471b6514a7e
10 March 2020
Panici, Diego
2e32ed2c-3d44-46e4-9a4a-e5935050539a
De Almeida, Gustavo
f6edffc1-7bb3-443f-8829-e471b6514a7e
Panici, Diego and De Almeida, Gustavo
(2020)
A theoretical analysis of the fluid-solid interactions governing the removal of woody debris jams from cylindrical bridge piers.
Journal of Fluid Mechanics, 886, [A19].
(doi:10.1017/jfm.2019.1048).
Abstract
This paper proposes a theoretical model to describe previous laboratory observations of the dynamics of debris accumulations around bridge piers of cylindrical shape. The model is based on the assumption that the observed dynamics is mainly governed by dynamic changes of the point of application of the drag force exerted on a solid body formed by debris accumulated around a pier. A phase-plane analysis of the resulting nonlinear system of ordinary differential equations shows that the model captures the main patterns observed in previous laboratory experiments, including an oscillatory motion and the removal of debris from the pier by the flow. The model provides a theoretical basis for the analysis of the conditions required for debris jams to remain stable over long periods of exposure to impinging flow. Namely, the model indicates that the stability of debris accumulations primarily depends on geometrical asymmetry and on the length of the extension downstream of the pier. The former induces the torque required to rotate the jam about the pier, while the latter produces a stabilising effect after the body rotates.
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jfm-paper_DP&GDA
- Accepted Manuscript
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Accepted/In Press date: 3 December 2019
e-pub ahead of print date: 14 January 2020
Published date: 10 March 2020
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© 2019 Cambridge University Press. All rights reserved.
Keywords:
hydraulics, river dynamics
Identifiers
Local EPrints ID: 436529
URI: http://eprints.soton.ac.uk/id/eprint/436529
ISSN: 0022-1120
PURE UUID: d081edca-ffed-4eb9-bcfb-9e6871be67c7
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Date deposited: 12 Dec 2019 17:30
Last modified: 17 Mar 2024 05:08
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Author:
Diego Panici
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