[en] A systematic experimental study has been carried out to compare the residual energy at the toe of a stepped spillway of varied length considering a classical ogee-crested weir (OCW) or two different piano key weirs (PKW) at the top of the structure. Four spillway lengths have been considered on a wide range of discharge. An indirect method has been used to compute the residual flow energy at the spillway toe from water depth measurements in a horizontal channel downstream. The results indicate that uniform flow conditions, i.e. flow energy at the spillway toe independent of the spillway length, are reached on significantly shorter spillways downstream of a PKW than downstream of an OCW. However, the uniform flow energy at constant discharge on the spillway is found to vary depending on the weir type. In particular, it is smaller downstream of the OCW than downstream of the PKWs.
Research Center/Unit :
Aquapôle - ULiège
Disciplines :
Civil engineering
Author, co-author :
Silvestri, Aurélien ; Université de Liège - ULiège > Département ArGEnCo > HECE (Hydraulics in Environnemental 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)
Dewals, Benjamin ; Université de Liège - ULiège > Département ArGEnCo > Hydraulics in Environmental and Civil Engineering
Erpicum, Sébastien ; Université de Liège - ULiège > Scientifiques attachés au Doyen (Sc.appliquées)
Language :
English
Title :
Comparative analysis of the energy dissipation on a stepped spillway downstream of a Piano Key Weir
Alternative titles :
[fr] Analyse comparative de la dissipation d'énergie en aval d'un évacuateur de crue en touches de piano
Publication date :
2014
Event name :
2nd Int. Work. on Labyrinth and Piano Key Weirs - PKW 2013
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
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