Toe-scour formation at Piano Key Weir

Jüstrich, Stefan (EPFL, Lausanne, Switzerland) ; Schleiss, Anton J. (EPFL, Lausanne, Switzerland)

Beyond their initial application on gravity dam crests as an element of an auxiliary spillway, Piano Key Weirs (PKWs) are more and more combined with weirs on rivers. Such applications comprise the level rise for river hydropower plants or to maintain a water level for inland navigation. PKWs are ungated structures, so that the “operational” risk is low. Furthermore, they have a hydraulic performant rating curve and a low risk of driftwood blocking, as compared to traditional weirs. Such a river application on a loose riverbed requests a laborious foundation, given that the structure is not directly built on rock or on dam concrete as for spillways. A key parameter for the stability of the PKW foundation is the ultimate scour-hole depth at the PKW toe. Further, measures to reduce the latter scour must be designed, as for instance a riprap protection of the riverbed downstream of the PKW. This paper reports of systematically conducted model experiments on PKW scour, and gives some indications on the parameters that are important to reduce the latter extend.


Faculty:
Ingénierie et Architecture
School:
HEIA-FR
Institute:
iTEC - Institut des technologies de l'environnement construit
Publisher:
London, CRC Press
Date:
2017-06
London
CRC Press
Pagination:
pp. 147-156
Published in:
Labyrinth and Piano Key Weirs III – PKW 2017 ; Proceedings of the 3rd International Workshop on Labyrinth and Piano Key Weirs (PKW 2017), 22-24 February 2017, Qui Nhon, Vietnam
Author of the book:
Erpicum, Sébastien ; ed.
Laugier, Frédéric ; ed.
Ho Ta Khanh, Michel ; ed.
Pfister, Michael ; School of Engineering and Architecture (HEIA-FR), HES-SO // University of Applied Sciences Western Switzerland
ISBN:
9781138050105
Appears in Collection:

Note: The status of this file is: restricted


 Record created 2021-05-21, last modified 2021-05-28

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