Air entrainment and energy dissipation on porous pooled stepped spillways

Felder, S. and Chanson, H. (2013). Air entrainment and energy dissipation on porous pooled stepped spillways. In: Daniel B. Bung and Stefano Pagliara, Proceedings of the International Workshop on Hydraulic Design of Low-Head Structures. International Workshop on Hydraulic Design of Low-Head Structures (IWLHS 2013), Aachen, Germany, (87-97). 20-22 February 2013.

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Author Felder, S.
Chanson, H.
Title of paper Air entrainment and energy dissipation on porous pooled stepped spillways
Conference name International Workshop on Hydraulic Design of Low-Head Structures (IWLHS 2013)
Conference location Aachen, Germany
Conference dates 20-22 February 2013
Proceedings title Proceedings of the International Workshop on Hydraulic Design of Low-Head Structures
Place of Publication Karlsruhe, Germany
Publisher Bundesanstalt fur Wasserbau (BAW)
Publication Year 2013
Sub-type Fully published paper
ISBN 9783939230045
Editor Daniel B. Bung
Stefano Pagliara
Start page 87
End page 97
Total pages 11
Collection year 2014
Language eng
Abstract/Summary The hydraulics of stepped spillways with flat steps is well documented and some design guidelines exist for typical embankment dam slopes. On the other hand, alternative stepped designs are poorly understood. In the present study, some porous pooled stepped spillways were investigated with two different porosities of the pooled weir. The air-water flow patterns, air-water flow properties and the energy dissipation rate were observed and compared to the corresponding flat and pooled stepped spillways. The comparative study highlighted a larger interfacial velocity for the pooled step configurations. The largest residual energy at the downstream end was observed for the porous pooled steps which was associated with reduced cavity recirculation and form drag. Overall the porous pooled stepped design exhibited some more stable flow patterns than the pooled stepped design, but it was characterised by a lesser rate of energy dissipation than the flat step design for the investigated slope (θ = 26.6°).
Keyword Stepped spillways
Porous pooled steps
Pooled steps
Flow aeration
Energy dissipation
Flow resistance
Drag reduction
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes The workshop proceedings are open access and freely accessible at the publisher webpage {http://www.baw.de/en/die_baw/publikationen/fachbuecher/index.php.html}. The full bibliographic details are: FELDER, S., and CHANSON, H. (2013). "Air Entrainment and Energy Dissipation on Porous Pooled Stepped Spillways." Proceedings of International Workshop on Hydraulic Design of Low-Head Structures, IAHR, 20-22 Feb., Aachen, Germany, D. BUNG and S. PAGLIARA Editors, Bundesanstalt für Wasserbau (BAW, Karlsruhe), pp. 87-97 (ISBN 978-3-939230-04-5).

Document type: Conference Paper
Collections: School of Civil Engineering Publications
Official 2014 Collection
 
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Created: Tue, 05 Mar 2013, 18:32:32 EST by Hubert Chanson on behalf of School of Civil Engineering