Piano Key Weir Hydraulics and Labyrinth Weir Comparison

Anderson, R M; Tullis, Blake P.

doi:10.1061/(asce)ir.1943-4774.0000530

Cited by 85 publications

(40 citation statements)

References 4 publications

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“…PKW research to date has primarily focused on hydraulic efficiency (Kabiri-Samani and Javaheri 2012;Leite Ribeiro et al 2012;Machiels 2012;Anderson and Tullis 2012a, 2012b, 2013, typically ignoring a possible negative effect of driftwood on the rating curve. Ouamane and Lempérière (2006) were among the first to conduct preliminary model tests with driftwood.…”

Section: Driftwood At 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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Section: Driftwood At 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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“…For a set head causing flow, the discharge over the ogee weir and piano-key weir were compared. The coefficient of discharge of an ogee weir is generally estimated based on the ratio of observed discharge and estimated discharge using equation (1). In this study, for the piano-key weir, the total length of the weir including the folds is used as b and the C d value of piano-key weir was estimated and compared with the C d value of ogee weir.…”

Section: Methodsmentioning

confidence: 99%

“…Piano-key weir was first designed in 2001 and very limited literature is available [1][2][3][4][5][6][7]. Studies on influence of piano-key weir geometry on the discharge are available in the literature.…”

Section: Piano-key Weirmentioning

confidence: 99%

Hydraulic Advantage of Piano-key Weir Over Ogee Weir

2019

IJITEE

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The piano-key weir is a new encouraging hydraulic structure yet to become a widespread usage due to limited knowledge of the hydraulic performance. A laboratory investigation on the hydraulic efficiency of the piano-key weir was compared with that of an ogee weir. The experiment data confirmed that the piano-key weir discharged more than ogee weir for the same upstream head. However, the coefficient discharge of the piano-key weir is extremely low compared to the ogee weir.

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“…Anderson and Tullis [32] investigated 9 laboratory-scale four-cycle PK weir configurations to develop a better understanding of the effects of PK weir geometry on discharge efficiency. The appropriateness of the recommended head-discharge equation specific to the recommended design was evaluated, and the relative head-discharge efficiency of trapezoidal labyrinth and PK weirs with respect to footprint restrictions and crest length were compared in this study.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Discharge Capacity of Labyrinth Weirs with and without Nappe Breakers

Bilhan¹,

Emiroğlu²,

Miller³

2016

WJM

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Labyrinth weirs provide higher discharge capacity than conventional weirs, with the ability to pass large flows at comparatively low heads. Labyrinth weirs are primarily used as spillways for dams where the spillway width is restricted. In recent years, many research investigations have considered the hydraulic performance of labyrinth weirs, particularly as dependent on the geometric features. The previous work has improved the design basis for such weirs. However, their design still requires experimentally derived and generalized performance curves. It is especially important to observe the behavior of the weir nappe to ensure the design provides hydraulic optimization and to account for pressure fluctuations, possible vibrations, resonance effect, noise and flow surging. In the present study, discharge coefficients were experimentally determined for both circular labyrinth weirs and sharp crested trapezoidal labyrinth weirs of varying side wall angle (α). Additional studies were completed with nappe breakers included to reduce the impact of vibration on the labyrinth weirs. In general, the test data indicated that nappe breakers placed on the trapezoidal labyrinth weirs and circular labyrinth weirs reduced the discharge coefficient by up to 4% of the un-amended weir.

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Piano Key Weir Hydraulics and Labyrinth Weir Comparison

Cited by 85 publications

References 4 publications

Effect of driftwood on hydraulic head of Piano Key weirs

Effect of driftwood on hydraulic head of Piano Key weirs

Hydraulic Advantage of Piano-key Weir Over Ogee Weir

Experimental Investigation of Discharge Capacity of Labyrinth Weirs with and without Nappe Breakers

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