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Analysis of Various Piano Key Weir Geometries Concerning Discharge Coefficient Development

Author(s): M. Oertel; F. Bremer

Linked Author(s): Mario Oertel

Keywords: No keywords

Abstract: Piano Key Weirs (PKW) are relatively new hydraulic structures and research investigations start a couple of years ago. PKWs have modified the labyrinth weir geometry and guarantee an effective discharge, e.g. as flood release structure on a dam or as replacement of regular shape weirs in river systems. Current research focuses on discharge coefficients for various discharge amounts. For small discharges regular weirs are less effective than PKWs, hence replacements might be reasonable. Thereby, a couple of questions are in the main focus of interest, like e.g. general hydraulic phenomena, sediment transport, fish climb capability, or geometry adaption. Usually, PKWs are analyzed in scaled experimental models, while discharge coefficients can be calculated via Poleni or Du Buat approach. Additionally, numerical 3D CFD simulations are available to confirm experimental model results. The present paper deals with various laboratory-scaled PKW geometries and analyzes their discharge coefficients. Investigations are carried out within a 10 m long and 0.8 m wide tilting flume. Upstream water levels are measured via ultrasonic sensor as longitudinal water surface profiles. The paper answers the question how three selected geometries will influence the PKW’s discharge coefficients and their efficiency.


Year: 2016

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