Debris-Blocking Sensitivity of Piano Key Weirs under Reservoir-Type Approach Flow
This article has a reply.
VIEW THE REPLYThis article has a reply.
VIEW THE REPLYPublication: Journal of Hydraulic Engineering
Volume 139, Issue 11
Abstract
The collection of floating woody debris at flow control structures, such as spillways and weirs, can potentially result in reduced discharge efficiency (higher upstream head for a given weir discharge). Compared to less hydraulically-efficient control structures, piano key weirs have higher discharge efficiency (lower upstream heads for a given discharge), which may increase the likelihood of woody debris collection. A systematic laboratory study was conducted to evaluate the interaction between various piano key weir geometries and woody debris types and sizes. The results of individual (noncumulative) debris tests indicated that floating debris blockage probability is highly influenced by trunk diameter and upstream head. The effects of debris accumulation on the upstream head varied with the value of the debris-free reference upstream head condition. At lower upstream reference head values, the cumulative debris tests indicated a relative increase of the debris-associated upstream head of approximately 70%; higher upstream reference head values produced upstream head increases limited to approximately 20%.
Get full access to this article
View all available purchase options and get full access to this article.
References
Bezzola, G. R., Gantenbein, S., Hollenstein, R., and Minor, H.-E. (2002). “Verklausung von Brückenquerschnitten [Blocking of bridge cross sections].” VAW Mitteilung, H.-E. Minor, ed., Vol. 175, ETH Zurich, Switzerland, 87–97 (in German).
Bezzola, G. R., and Hegg, C., eds. (2007). Ereignisanalyse Hochwasser 2005 [2005 Flood event analysis], Bundesamt für Umwelt & Eidgenössische Forschungsanstalt für Wald, Schnee und Landschaft, Bern, Switzerland (in German).
Laugier, F. (2007). “Design and construction of the first Piano Key Weir spillway at Goulours Dam.” Int. J. Hydropower Dams, 13(5), 94–100.
Leite Ribeiro, M., Pfister, M., Schleiss, A. J., and Boillat, J.-L. (2012a). “Hydraulic design of A-type Piano Key Weirs.” J. Hydraulic Res., 50(4), 400–408.
Leite Ribeiro, M., Bieri, M., Boillat, J.-L., Schleiss, A. J., Singhal, G., and Sharma, N. (2012b). “Discharge capacity of Piano Key Weirs.” J. Hydraul. Eng., 138(2), 199–203.
Lempérière, F., Vigny, J. P., and Ouamane, A. (2011). “General comments on Labyrinth and Piano Key Weirs: The past and present.” Proc., Intl. Conf. Labyrinth and Piano Key Weirs, Liège B, CRC Press, Boca Raton, FL, 17–24.
Machiels, O., Erpicum, S., Dewals, B. J., Archambeau, P., and Pirotton, M. (2011). “Experimental observation of flow characteristics over a Piano Key Weir.” J. Hydraulic Res., 49(3), 359–366.
Melville, B. W., and Dongol, D. M. (1992). “Bridge pier scour with debris accumulation.” J. Hydraul. Eng., 118(9), 1306–1310.
Novak, P., Guinot, V., Jeffrey, A., and Reeve, D. E. (2010). Hydraulic modelling: An introduction, Spon Press, London.
Ouamane, A., and Lempérière, F. (2006). “Design of a new economic shape of weir.” Proc., Int. Symp. Dams in the Societies of the 21st Century, Taylor & Francis, London, UK, 463–470.
Pagliara, S., and Carnacina, I. (2010). “Temporal scour evolution at bridge piers: effect of wood debris roughness and porosity.” J. Hydraulic Res., 48(1), 3–13.
Pralong, J., et al. (2011). “A naming convention for the piano key weirs geometrical parameters.” Proc., Int. Conf. Labyrinth and Piano Key Weirs, Liège B, CRC Press, Boca Raton, FL, 271–278.
Schmocker, L., and Hager, W. H. (2011). “Probability of drift blockage at bridge decks.” J. Hydraul. Eng., 137(4), 470–479.
Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 139 • Issue 11 • November 2013
Pages: 1134 - 1141
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Feb 25, 2013
Accepted: May 22, 2013
Published online: Oct 15, 2013
Published in print: Nov 1, 2013
Discussion open until: Mar 15, 2014
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.