Location

Utah State University, Logan, Utah, USA

DOI

10.15142/T3WC7V

Start Date

6-17-2012 12:00 AM

End Date

6-20-2012 12:00 AM

Description

ABSTRACT: The increase in predicted extreme flood event magnitudes has required the modification of many existing reservoir spillway flow control structures with more hydraulically efficient designs. The arced labyrinth is a relatively new, highly efficient, nonlinear weir design specifically applicable to reservoir applications. Flow characteristics of eleven laboratory-scale arced labyrinth weir geometries were studied at the Utah Water Research Laboratory with sidewall angles α = 12° and 20°. Rating curves, flow conditions, and discharge efficiencies were documented for each configuration to increase the hydraulic database of arced labyrinth weirs.

Arced labyrinth weirs with α = 20° were found to have discharge efficiencies 5 to 10% higher than α = 12° weirs. They also generated more flow anomalies (i.e. unstable nappe aeration) due to approach flow interaction with cycle orientation and weir position. The hydraulic efficiency of projecting, traditional labyrinth weirs, as a function of abutment wall geometry, was also evaluated. No standardized design method currently exists for arced labyrinth weirs, and relatively little is known about their hydraulic characteristics; this discussion increases the hydraulic information available for the arced labyrinth weir design.

Share

COinS
 
Jun 17th, 12:00 AM Jun 20th, 12:00 AM

Arced Labyrinth Weir Flow Characteristics

Utah State University, Logan, Utah, USA

ABSTRACT: The increase in predicted extreme flood event magnitudes has required the modification of many existing reservoir spillway flow control structures with more hydraulically efficient designs. The arced labyrinth is a relatively new, highly efficient, nonlinear weir design specifically applicable to reservoir applications. Flow characteristics of eleven laboratory-scale arced labyrinth weir geometries were studied at the Utah Water Research Laboratory with sidewall angles α = 12° and 20°. Rating curves, flow conditions, and discharge efficiencies were documented for each configuration to increase the hydraulic database of arced labyrinth weirs.

Arced labyrinth weirs with α = 20° were found to have discharge efficiencies 5 to 10% higher than α = 12° weirs. They also generated more flow anomalies (i.e. unstable nappe aeration) due to approach flow interaction with cycle orientation and weir position. The hydraulic efficiency of projecting, traditional labyrinth weirs, as a function of abutment wall geometry, was also evaluated. No standardized design method currently exists for arced labyrinth weirs, and relatively little is known about their hydraulic characteristics; this discussion increases the hydraulic information available for the arced labyrinth weir design.

 

To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.