stepped spillways; Piano Key weirs; energy dissipation
Abstract :
[en] Recent researches showed the rapid aeration of the flow downstream of piano key weirs. This could be related to the specific geometric features of the structure, creating several interacting flows and jets downstream. In order to validate this assumption, an experimental research has been carried out at the Laboratory of Engineering Hydraulics, University of Liège. The main objective of the study was to an-alyze the energy dissipation occurring in skimming flow conditions on a stepped spillway downstream of a piano key weir (PKW). Comparison with energy dissipation on a stepped spillway downstream of a standard ogee crested weir has been performed. An indirect method has been used to determine the resid-ual energy at the spillway toe. The results show that uniform flow conditions are reached faster on a stepped spillway downstream of a PWK compared to the length needed downstream of a standard ogee crested weir. Extrapolation of the results to prototype flow conditions is also discussed with regards to scale effects influence.
Disciplines :
Civil engineering
Author, co-author :
Silvestri, Aurélien ; Université de Liège - ULiège > Département Argenco : Secteur MS2F > HECE (Hydraulics in Environnemental and Civil Engineering)
Pirotton, Michel ; Université de Liège - ULiège > Département Argenco : Secteur MS2F > HECE (Hydraulics in Environnemental and Civil Engineering)
Erpicum, Sébastien ; Université de Liège - ULiège > Services généraux (Faculté des sciences appliquées) > Scientifiques attachés au Doyen (Sc.appliquées)
Dewals, Benjamin ; Université de Liège - ULiège > Département Argenco : Secteur MS2F > Hydraulics in Environmental and Civil Engineering
Archambeau, Pierre ; Université de Liège - ULiège > Département Argenco : Secteur MS2F > HECE (Hydraulics in Environnemental and Civil Engineering)
Language :
English
Title :
Stepped spillway Downstream of a Piano Key Weir - Critical length for uniform flow
Publication date :
2013
Event name :
Proceedings of the International Workshop on Hydraulic Design of Low-Head Structures
Event place :
Aachen, Germany
Event date :
du 20 février 2013 au 22 février 2013
Audience :
International
Main work title :
International Workshop on Hydraulic Design of Low-Head Structures
