By Sébastien Erpicum, Frédéric Laugier, Michael Pfister, Michel Pirotton, Guy-Michel Cicero, Anton J. Schleiss
Dam engineering is at present experiencing a powerful revival of labyrinth orientated weirs. Labyrinth weirs, with a repetitive constructional personality and an elevated particular discharge capability, are an excellent technical-economical compromise. the concept that of Piano Key Weir (PKW), with alveoli constructed in overhangs from a discounted help quarter, allows the install of non-linear crests on the best of concrete dams. hence it removes the most quandary of classical labyrinth weirs, and allows their use to rehabilitate a variety of latest dams.
Since the 1st implementation of piano key weirs via Electricité de France on Goulours dam (France) in 2006, no less than 8 PKWs were inbuilt France, Vietnam and Switzerland. Their operation over many years has already supplied the 1st prototype facts. different tasks are less than examine, development or making plans in assorted international locations. On one other hand, examine courses are below growth everywhere in the world.
Following a primary variation in 2011, Labyrinth and Piano Key Weirs II – PKW 2013 collects up to date contributions from individuals with a variety of backgrounds, from engineers and researchers to teachers. Summarizing the final advancements on labyrinth orientated weirs, the e-book constitutes the cutting-edge in learn and alertness of piano key weir options, and should be important to execs and scientists attracted to Dams Engineering.
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Extra resources for Labyrinth and Piano Key Weirs II
H. 2010, Experimental optimization of a Piano Key Weir to increase the spillway capacity of the Malarce dam, 1st IAHR European Congress, Edinburgh, United Kingdom. , Luck, M. & Vettori, E. 2011, Study of piano-key morning glory to increase the spillway capacity of the Bage dam, Labyrinth and piano key weirs-PKW 2011, CRC Press, London, 199–206. Crookston, B. and Tullis, B. 2010, Hydraulic performance of labyrinth weirs, in proceedings of International Junior Researcher and Engineer Workshop on Hydraulic Structures, Edinburgh, UK.
Tous dam (Spain), Lake Ha! Ha! (Canada), Opuha dam (New Zealand), Glashüttte dam failure (Germany). A number of embankment dam overtopping protection systems were developed during the last few decades. Herein several design techniques are presented and discussed, after a brief discussion of the embankment breaching process. The prototype experience gained during the past decades is analysed and discussed. 23 Figure 1. Photographs of embankment dam and spillways (a) Melton dam, Melton VIC (Australia) on 30 January 2000; (b) Chinchilla minimum energy loss (MEL) weir, Chinchilla QLD (Australia) in operation on 8 November 1997; (c) Timber crib structure: Greenup weir, Inglewood QLD (Australia) on 21 January 2009 (Courtesy of Damien Roman); (d) Sheet-pile concrete slab embankment: Joe Sippel weir, Murgon QLD (Australia) in operation on 5 March 2013.
This configuration is essentially characterized by a rounded entrance which improves its hydraulic performance. An experimental analysis of the hydraulic performance has concerned two models of labyrinth weirs with the same geometrical sizes and a trapezoidal shape, the first with a flat shape of the upstream wall and the second with a rounded shape. The comparison of results obtained on two models of weir (Fig. 3) noted that the design of a rounded shaped entrance leads for an improving of the performance of about 10%.
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