From Labyrinth to Piano Key Weirs – A historical review

Schleiss, Anton

doi:10.1201/b12349-3

Cited by 39 publications

(14 citation statements)

References 12 publications

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“…Due to their simple structure, they are considered an economic structure and are also a powerful solution for the needs of dam projects such as increasing flow capacity or reducing sections dedicated to flood flow. Other benefits of piano key weirs can be: (i) the ability to be constructed on available dams and new gravity dams; (ii) increasing the specific flow of weirs up to 100 m 3 s‾¹ m‾¹; (iii) an increase in flow, at least four times compared to conventional weirs; (iv) raising the capacity of the reservoir of dams; (v) having economic feasibility and low maintenance costs (Schleiss, 2011). Figure 2 shows the plan and profile of the piano key weir with its geometrical parameters.…”

Section: O T S C L é Smentioning

confidence: 99%

Laboratory investigation of the discharge coefficient of triangular labyrinth weirs with and without slots and comparing them with piano key weirs*

Ariyamanesh

Heidarnejad

2020

Irrigation and Drainage

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With an increase of the length of a crest in a given width, labyrinth weirs lead to an increase in flow transition capacity over the weir. This study was performed on a laboratory flume with a length of 12.5 m, width of 0.3 m and a height of 0.4 m, using triangular labyrinth weirs (with and without slots), each having single-and two-cycle models. First, their hydraulic performance was examined, and then it was compared with that of a piano key weir (singlecycle, two-cycle). The results showed that the increase in crest length through a slot in single-and two-cycle weirs cannot be an effective factor. The presence of a slot in single-and two-cycle triangular weirs led to a decrease in the discharge coefficient of these weirs up to 35 and 33% respectively, compared to weirs without any slot. This is due to energy loss, local submergence and flow interference in the nose slot even at low flows. However, the flow's index weir (triangular weir slot, one slot) compared to single-and two-cycle piano key weirs dropped by 40 and 26% respectively. K E Y W O R D S discharge coefficient, piano key weir, triangular labyrinth weir Résumé Avec l'augmentation de la longueur de la crête dans une largeur donnée, les déversoirs du labyrinthe entraînent une augmentation de la capacité de transition d'écoulement au-dessus du déversoir. Cette étude a été réalisée sur un canal de laboratoire d'une longueur de 12.5 m, d'une largeur de 0.3 m et d'une hauteur de 0.4 m, en utilisant des déversoirs à labyrinthe triangulaire (avec et sans fente) ayant chacun des modèles à cycle unique et à deux cycles. Tout d'abord, leurs performances hydrauliques ont été examinées, puis comparées à celles d'un déversoir à touches de piano (cycle unique, deux cycles). Les résultats ont révélé que l'augmentation de la longueur de la crête à travers une fente dans les déversoirs à cycle unique et à deux cycles ne peut pas être un * Étude en laboratoire du coefficient de débit de déversoirs triangulaires à labyrinthe avec et sans fentes et comparaison avec des déversoirs à touches de piano.

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Section: O T S C L é Smentioning

confidence: 99%

Laboratory investigation of the discharge coefficient of triangular labyrinth weirs with and without slots and comparing them with piano key weirs*

Ariyamanesh

Heidarnejad

2020

Irrigation and Drainage

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“…In the last decade, the implementation of PKWs in practice has increased significantly, particularly in France (e.g., Laugier 2007, Laugier et al 2009) and presently under construction in Vietnam (Ho Ta Khan et al 2011). Lempérière et al (2011) and Schleiss (2011) presented historical reviews on the evolution from Labyrinth weirs to PKWs, with a focus on the hydraulic characteristics of PKW operation. Note that the standard naming convention for PKWs as introduced by Pralong et al (2011) is applied herein.…”

Section: Piano Key Weirsmentioning

confidence: 99%

Effect of driftwood on hydraulic head of Piano Key weirs

Pfister¹,

Schleiss²,

Tullis³

2013

Labyrinth and Piano Key Weirs II

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“…Plan form of these are similar but the apex of PKW is inclined and turns both in up-and downstream directions. In contrast to labyrinth weirs, PKW benefits from having certain overhangs which lead to smaller footprint of the structures [4]. Application of PKWs offers several advantages such as: increasing discharge capacity up to three times in comparison with straight linear spillways, capability of construction on existing and new gravity dams, economical efficiency, less maintenance costs, simple structure and ease of construction [5].…”

Section: Introductionmentioning

confidence: 99%