Labyrinth and Piano Key Weirs II  book cover
1st Edition

Labyrinth and Piano Key Weirs II

ISBN 9781138000858
Published October 21, 2013 by CRC Press
312 Pages

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Book Description

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.

Table of Contents

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

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