Date of Award

2014

Degree Type

Report

Degree Name

Master of Science (MS)

Department

Civil and Environmental Engineering

First Advisor

Blake P. Tullis

Abstract

Arced labyrinth weirs have been researched in recent years as a viable option to help increase spillway discharge capacity. Previously published data have indicated the hydraulic efficiency of these weirs with several configurations at different sidewall angles (α=6°, α=12°, and α=20°), expressed in terms of the discharge coefficients. These published discharge coefficient data were used in the current study, along with new experimental data, to develop a better understanding of the accuracy associated with interpolating arced labyrinth weir discharge coefficients. Discharge coefficient data for a 16° arced labyrinth weir (of similar physical size to the arced labyrinth weirs in the literature) were determined as part of a physical model study. The α=16° experimental discharge coefficient data were compared against interpolated data using the α=12° and 20° published data using two interpolation methods, linear and double spline interpolation. It was concluded that the double spline interpolation data more accurately matched the experimental data and is recommended as the preferred method for interpolating between arced labyrinth weir discharge coefficients. Interpolating proved to perform well for a first-order approximation. The reservoir approach flow conditions for this model study are examined and compared with the simplified previously published approach flow conditions.

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