Piano Key Weirs: The Experimental Study Of
An Efficient Solution For Rehabilitation
Author(s)
O. Machiels, S. Erpicum, B. J. Dewals, P. Archambeau
& M. Pirotton
Abstract
The Piano Key Weir (PKW) is a particular geometry of weirs associating with a
labyrinth shape and the use of overhangs, which reduce the basis length. The
PKW could thus be directly placed on a dam crest. Together with its important
discharge capacity for low heads (up to four times that of a Creager weir), this
geometric feature makes the PKW an interesting solution for dam rehabilitation.
The PKW is a new type of weir, first designed in 2001 and built for the first
time in 2006. Even if the first experimental studies confirmed its discharge
capacities, there is still a lack of understanding of the flow behaviour upstream,
along and downstream from this complex structure.
An experimental research, started in 2008 at the Laboratory of Engineering
Hydraulics of the University of Liege, will provide contributions to the study of
the flow behaviour on large PKW scale models, along with a geometric
parameters analysis on models with variable geometries. These studies will
enable one to define efficient and scientifically based design rules. This paper
presents the strategy and main goals of this four-year study. These goals are also
illustrated based on the first results obtained from experiments carried out on
large scale models of PKW. The hydraulic behaviour of the structure is clarified
based on measurements of water depths, pressures, velocities and discharges on
each part of the weir.
Keywords: Piano Key Weir (PKW), experimental study, rehabilitation.
Keywords
Piano Key Weir (PKW), experimental study, rehabilitation
Related Book
Other papers in this volume
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