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Full-Text Articles in Civil and Environmental Engineering
Nonlinear Weir Hydraulics, Mitchell R. Dabling
Nonlinear Weir Hydraulics, Mitchell R. Dabling
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
A hydraulically undersized control structure (i.e., an emergency dam spillway) could result in water overtopping a dam or riverbanks. To increase hydraulic capacity and reduce flooding risk, nonlinear weirs are being used to replace undersized linear weirs during control structure rehabilitation. The complex geometry of a nonlinear weir creates an infinite number of designs and three-dimensional flow patterns. This study investigates four subjects to further knowledge on two types of nonlinear weir, the piano key and labyrinth.
Weir submergence is a condition when the downstream water level of a weir exceeds the weir crest elevation, and can influence the head-discharge …
Piano Key Weir Head Discharge Relationships, Ricky M. Anderson
Piano Key Weir Head Discharge Relationships, Ricky M. Anderson
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
A piano key (PK) weir is a type of nonlinear (labyrinth-type) weir developed specifically for free-surface flow control structures with relatively small spillway footprints. Currently, no generally accepted standard PK weir design procedure is available. This is due, in part, to the large number of geometric parameters and a limited understanding of their effects on discharge efficiency (discharge efficiency is quantified by the discharge coefficient of the standard weir equation). However, Hydrocoop, a non-profit French dam spillways association, has recommended a PK weir design and a head-discharge relationship specific to that geometry.
To develop a better understanding of the effects …