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Journal of Hydraulic Research Volume 52, 2014 - Issue 3
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Research paper

Experimental parametric study and design of Piano Key Weirs

Olivier MachielsArcadis Belgium, B-4000Liège, BelgiumCorrespondence[email protected]
(Project Engineer) ,
Michel PirottonHydraulics in Environmental and Civil Engineering (HECE), University of Liege (ULg), B-4000Liège, Belgium Email: [email protected]
(IAHR Member), Professor,
Archambeau PierreHydraulics in Environmental and Civil Engineering (HECE), University of Liege (ULg), B-4000Liège, Belgium Email: [email protected]
(Research Associate) ,
Benjamin DewalsHydraulics in Environmental and Civil Engineering (HECE), University of Liege (ULg), B-4000Liège, Belgium Email: [email protected]
(IAHR Member), Assistant Professor &
Sébastien ErpicumHydraulics in Environmental and Civil Engineering (HECE), University of Liege (ULg), B-4000Liège, Belgium Email: [email protected]
(IAHR Member), Research Associate
Pages 326-335 | Received 02 Jan 2013, Accepted 10 Dec 2013, Published online: 26 Mar 2014
 
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ABSTRACT

Piano Key Weirs are an effective solution for dam rehabilitation as well as new dam projects with a high level of hydraulic constraints. In order to improve the efficiency of their design, an experimental study of the influence of the main geometric parameters has been performed. Thirty one configurations were tested for a wide range of discharges. The results of the study show the influence of the weir height, the keys widths and the overhangs lengths on the discharge capacity and flow characteristics. Based on hydraulic considerations, optimum values of the main geometric ratios are provided. An analytical formulation is developed to predict the discharge capacity of the weir as a function of its geometry. It shows an accuracy of 10% compared to the experimental results of this study and from other sources.

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