Experimental Studies on Determination of Discharge Capacity of Circular Labyrinth Weirs Located on A Straight Channel

Year 2016, Volume: 6 Issue: 3, 1227 - 1239, 05.11.2016

Omer Bılhan M. Emin Emiroğlu

Abstract

Labyrinth weirs are particularly well
suited for spillway rehabilitation where dam safety concerns, freeboard
limitations, and a revised and larger probable maximum flow have required
replacement or modification of the spillway. Labyrinth weirs with multiple
crest elevations can be used in spillway design to confine base flows to a
section of the crest and/or satisfy discharge hydrograph requirements.
Labyrinth weirs provide higher discharge capacity than conventional weirs, with
the ability to pass large flows at comparatively low heads. Over past 50 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. In the present study, discharge
coefficients were experimentally determined for both sharp crested
semi-circular labyrinth weirs and trapezoidal labyrinth weirs of side wall
angle (α=370).
A comprehensive laboratory study including 9 models was conducted to determine
the discharge coefficient of the semi-circular labyrinth weirs. It was found
that from this experimental study the discharge coefficient of the circular
labyrinth weir is higher than that of the linear weir, but lower than that of
the trapezoidal weir.

Keywords

Fluid Mechanics; Discharge coefficient; Circular; Trapezoidal; Labyrinth weir, Dam Safety

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