Faculté des Sciences appliquées
Faculté des Sciences appliquées

Air water flow conditions on spillway channels downstream of Piano key weirs

Dalem, Juliette ULiège
Promotor(s) : Erpicum, Sébastien ULiège
Date of defense : 26-Jun-2023/27-Jun-2023 • Permalink :
Title : Air water flow conditions on spillway channels downstream of Piano key weirs
Translated title : [fr] Conditions d’écoulement biphasique sur les coursiers en aval des déversoirs en touches de piano
Author : Dalem, Juliette ULiège
Date of defense  : 26-Jun-2023/27-Jun-2023
Advisor(s) : Erpicum, Sébastien ULiège
Committee's member(s) : Dewals, Benjamin ULiège
Nguyen, Frédéric ULiège
Bung, Daniel 
Language : English
Number of pages : 73
Keywords : [en] Piano Key Weirs
[en] Air-water flows
Discipline(s) : Engineering, computing & technology > Civil engineering
Target public : Researchers
Professionals of domain
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en ingénieur civil des constructions, à finalité spécialisée en "civil engineering"
Faculty: Master thesis of the Faculté des Sciences appliquées


[en] Piano Key Weirs (PKWs) are an improvement of labyrinth key weirs. This type of weir can be placed on the dams needing to be restored, which is an advantage given the number of ageing dams. PKWs are used as the crest of spillways in order to manage water discharge, mitigate flood risks, and maintain the structural integrity of the dams. However, few studies have been carried out on flow properties downstream of this type of weir.\\

The main aim of this research work is to compare different flow properties as the clear water depths, the velocities, the air concentration profiles or the dissipated energy for different spillway types for a steep slope. Three weirs are tested: a Creager weir and two PKWs with different geometries. For each weir, a smooth and a stepped spillway are placed, making a total of six configurations tested. The results are obtained with a double-tips conductivity probe.\\

Different conclusions were drawn from the results obtained in this work. Firstly, more air is entrained in the flow for stepped spillways than for smooth spillways. Moreover, in the case of smooth spillway, the air entrainment is more important for PKWs while, for the stepped spillways, the air entrainment can be considered to be the same for the different weirs. Then, a non-uniformity of heads across the width of the channel appears downstream the PKWs. The head variation is greater for smooth spillways than for stepped spillways. Finally, the stepped
spillways dissipate more energy than smooth spillways. Moreover, the type of weir seems to have a small influence on the dissipated energy. Even if the difference is not very important, the dissipated energy is slightly greater in the case of a Creager weir than PKWs.



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  • Dalem, Juliette ULiège Université de Liège > Master ingé. civ. constr., fin.


Committee's member(s)

  • Dewals, Benjamin ULiège Université de Liège - ULiège > Département ArGEnCo > Hydraulics in Environmental and Civil Engineering
    ORBi View his publications on ORBi
  • Nguyen, Frédéric ULiège Université de Liège - ULiège > Département ArGEnCo > Géophysique appliquée
    ORBi View his publications on ORBi
  • Bung, Daniel
  • Total number of views 70
  • Total number of downloads 101

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