1st Edition
Labyrinth and Piano Key Weirs II
Dam engineering is currently experiencing a strong revival of labyrinth oriented weirs. Labyrinth weirs, with a repetitive constructional character and an increased specific discharge capacity, are a very good technical-economical compromise. The concept of Piano Key Weir (PKW), with alveoli developed in overhangs from a reduced support area, enables the installation of non-linear crests at the top of concrete dams. As a result it eliminates the main drawback of classical labyrinth weirs, and enables their use to rehabilitate numerous existing dams.
Since the first implementation of piano key weirs by Electricité de France on Goulours dam (France) in 2006, at least eight PKWs have been built in France, Vietnam and Switzerland. Their operation over a few years has already provided the first prototype data. Other projects are under study, construction or planning in varied countries. On another hand, research programs are under progress all over the world.
Following a first edition in 2011, Labyrinth and Piano Key Weirs II – PKW 2013 collects up-to-date contributions from people with various backgrounds, from engineers and researchers to academics. Summarizing the last developments on labyrinth oriented weirs, the book constitutes the state-of-the-art in research and application of piano key weir solutions, and will be invaluable to professionals and scientists interested in Dams Engineering.
Keynote lectures
The Piano KeyWeirs: 15 years of Research & Development – Prospect
M. Ho Ta Khanh
Improvement of labyrinth weirs shape
A. Ouamane
Embankment dam spillways and energy dissipators
H. Chanson
A. Physical and numerical modeling – Hydraulic capacity and scale effects
Effects of the crest shape on the discharge efficiency of a type A Piano KeyWeir
G.M. Cicero & J.R. Delisle
Influence of geometrical parameters on PK-Weirs discharge with 3D numerical analysis
V. Lefebvre, J. Vermeulen & B. Blancher
Staged labyrinth weirs and their effects on the outflow hydrograph
M.R. Dabling & B.P. Tullis
Escouloubre Piano Key weir: Prototype versus scale models
S. Erpicum, A. Silvestri, B. Dewals, P. Archambeau, M. Pirotton, M. Colombié & L. Faramond
Scale effects related to the rating curve of cylindrically crested Piano Key weirs
M. Pfister, E. Battisacco, G. De Cesare & A.J. Schleiss
B. Physical and numerical modeling – Submergence and energy dissipation
Submerged flow regimes of Piano Key weir
F. Belaabed & A. Ouamane
Experimental study on vertical velocity and submergence depth near Piano Key weir
N. Sharma & H. Tiwari
Discharge characteristics of Piano Key weirs under submerged flow
G.M. Cicero & J.R. Delisle
Comparative analysis of the energy dissipation on a stepped spillway downstream of a Piano KeyWeir
A. Silvestri, P. Archambeau, M. Pirotton, B. Dewals & S. Erpicum
C. Hydraulic and structural design
Comparison of Piano KeyWeirs with labyrinth and gated spillways: Hydraulics, cost, constructability and operations
G.S. Paxson, B.P. Tullis & D.J. Hertel
An analytical approach for Piano Key weir hydraulic design
O. Machiels, B. Dewals, P. Archambeau, M. Pirotton & S. Erpicum
Estimation of A-type Piano Key weir rating curve
M. Pfister & A.J. Schleiss
D. Planned projects
Design of a Piano-KeyWeir for Giritale Dam spillway in Sri Lanka
H.M. Jayatillake & K.T.N. Perera
Piano KeyWeir spillway: Upgrade option for a major dam
M.A. Phillips & E.J. Lesleighter
Designing a new spillway for the Rassisse Dam
A. Bail, L. Deroo & J.P. Sixdenier
Hydraulic scale model of the daisy-shape spillway on the Causse Corrézien dam
P.E. Loisel, F. Duval & S. Chanourdie
Application of the Piano KeyWeir spillway in the Republic of South Africa
A.J. Botha, I.P. Fitz, A.J. Moore, F.E. Mulder & N.J. Van Deventer
Hydraulic physical model of Piano KeyWeirs as additional flood spillways on the Charmine dam
P.E. Loisel, P. Valley & F. Laugier
Quipolly dam: A case study on customizing Fusegates® design for adverse spillway conditions
M. Beretta, A.G. Merino, O. Cazaillet & R. Batterham
E. Existing projects
Overview of Piano KeyWeirs experience developed at EDF during the past few years
F. Laugier, J. Vermeulen &V. Lefebvre
The first commercial Piano KeyWeir in Switzerland
P. Eichenberger
Raising the bellmouth spillway at Black Esk reservoir using Piano Key weirs
J.C. Ackers, F.C.J. Bennett, T.A. Scott & G. Karunaratne
Spillway capacity upgrade at Malarce dam: Construction of an additional piano key weir spillway
T. Pinchard, J.-L. Farges, J.-M. Boutet, A. Lochu & F. Laugier
F. Future developments
Effect of driftwood on hydraulic head of Piano Key weirs
M. Pfister, A.J. Schleiss & B.P. Tullis
Experimental and numerical study of the hydraulic performance of a trapezoidal Piano Key weir
G.M. Cicero, J.R. Delisle, V. Lefebvre & J. Vermeulen
Overview of Piano Key weir prototypes and scientific model investigations
M. Leite Ribeiro, M. Pfister & A.J. Schleiss
Effective spillways: Harmonizing labyrinth weir hydraulic efficiency and project requirements
B.M. Crookston, G.S. Paxson & D.B. Campbell
Author index
Biography
Sébastien Erpicum, Frédéric Laugier, Michael Pfister, Michel Pirotton, Guy-Michel Cicero, Anton J. Schleiss