[en] A 1.77 m high piano key weir in operation on the Escouloubre balance basin enabled the observation of real size flows for discharges ranging from 1.2 to 10 m³/s, corresponding to upstream heads ranging from 11 to 48 cm. These observations are depicted and compared to the results gained on three physical models of the weir, built and operated considering a Froude similitude and geometric scale factors of, respectively, 1:7, 1:15 and 1:25. The study highlights the scale effects which may affect piano key weirs scale model studies and provides criteria to limit them. In particular, the results analysis shows that the scale models succeed in representing the flow conditions on the weir when the model upstream head is higher than 60 mm, and succeed in predicting the weir discharge capacity when the model upstream head is higher than 30 mm.
Research center :
Aquapôle - ULiège
Disciplines :
Civil engineering
Author, co-author :
Erpicum, Sébastien ; Université de Liège - ULiège > Scientifiques attachés au Doyen (Sc.appliquées)
Silvestri, Aurélien ; Université de Liège - ULiège > Département ArGEnCo > HECE (Hydraulics in Environnemental and Civil Engineering)
Dewals, Benjamin ; Université de Liège - ULiège > Département ArGEnCo > Hydraulics in Environmental and Civil Engineering
Archambeau, Pierre ; Université de Liège - ULiège > Département ArGEnCo > HECE (Hydraulics in Environnemental and Civil Engineering)
Pirotton, Michel ; Université de Liège - ULiège > Département ArGEnCo > HECE (Hydraulics in Environnemental and Civil Engineering)
Colombié, Marie
Faramond, Laurent
Language :
English
Title :
Escouloubre Piano Key weir: prototype versus scale models
Alternative titles :
[fr] Déversoir en touches de piano d'Escouloubre: prototype versus modèles réduits
Publication date :
2014
Event name :
2nd Int. Work. on Labyrinth and Piano Key Weirs
Event organizer :
EDF-LNHE et CIH, LCH-EPFL, HECE-ULg
Event place :
Paris (Chatou), France
Event date :
20-22 novembre 2013
Audience :
International
Main work title :
Labyrinth and Piano Key Weirs II - PKW 2013
Main work alternative title :
[fr] Déversoirs en labyrinthe et en touches de piano II - PKW 2013
Editor :
Erpicum, Sébastien ; Université de Liège - ULiège > Urban and Environmental Engineering
Laugier, Frédéric
Pfister, Michael
Pirotton, Michel ; Université de Liège - ULiège > Urban and Environmental Engineering
Bretschneider, H. 1980. Models of hydraulic structures: discharge conditions, energy dissipation, erosion. In Kobus H. (ed.), Hydraulic modeling: 183-204. Hamburg: Parey.
Ettema, R. (ed.) 2000. Hydraulic modeling: concepts and practice. ASCE Manuals and reports on engineering practices No. 97. Reston: ASCE.
Heller, V. 2011. Scale effects in physical hydraulic engineering models. Journal of Hydraulic Research, 49(3): 293-306.
Leite Ribeiro, M., Bieri, M., Boillat, J.-L., Schleiss, A., Delorme, F. & Laugier, F. 2009. Hydraulic capacity improvement of existing spillways - Design of piano keyweirs. In Proceedings of the 23rd ICOLD Congress (Q90, R43), Brasilià, 21-29 May 2009. Paris: CIGB-ICOLD.
MacHiels, O., Erpicum, S., Dewals, B.J., Archambeau, P. & Pirotton, M. 2011. Experimental observation of flow characteristics over a Piano KeyWeir. Journal of Hydraulic Research, 49(3): 359-366.
Pralong, J., Vermeulen, J., Blancher, B., Laugier, F., Erpicum, S., MacHiels, O., Pirotton, M., Boillat, J.-L., Leite Ribeiro, M.&Schleiss, A. 2011.Anaming convention for the PianoKeyWeirs geometrical parameters. In Erpicum, S., Laugier, F., Boillat, J.-L., Pirotton, M., Reverchon, B. & Schleiss, A.J. (eds.), Labyrinth and piano key weirs-PKW 2011: 271-278. London: CRC Press.
