IT CAN BE DONE! LABYRINTH WEIR DESIGN GUIDANCE FOR HIGH HEADWATER AND LOW CYCLE WIDTH RATIOS

摘要

Published hydraulic design methods for labyrinth weirs include geometric and hydraulic design constraints. As a result, designers have been limited to headwater ratios (Ht/P) below 1.0 and cycle width ratios (w/P) greater than 2.0. These constraints are primarily due to the experimental data the method is founded upon, rather than boundaries of forbidden design regions. This paper presents the results and conclusions from physical and numerical (CFD) modeling of labyrinth weirs for headwater ratios exceeding 1.0 and cycle width ratios less than 2.0. The results presented herein demonstrate that even under relatively high flow depths, labyrinth weirs have a higher discharge capacity than linear weirs for a given spillway width. Also, the relative impacts of the cycle width ratio on geometric design and hydraulic performance are discussed.