Start Date

2018 5:20 PM

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

Abstract

In order to evaluate the flow characteristics downstream of a rectangular labyrinth weir including energy dissipation an experimental study was carried out. The objective was to develop a relation between drop height, discharge and the amount of dissipated energy. For the physical tests a 0.60 m wide flume with a length of 18.00 m and a height of 1.20 m was used. For the design of the stilling basin combinations of discharges and downstream water levels were analyzed. The results show that for the given conditions a simple concrete apron or a riprap protection corresponding to the hydraulic jump length is sufficient for erodible river beds. For low downstream water levels the energy dissipation occurs in a steady hydraulic jump closed to the weir. Raising the downstream water level, the hydraulic jump becomes submerged. Due to its geometrical shape, the labyrinth weir can ensure overall an effective energy dissipation.

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May 17th, 5:20 PM

Energy Dissipation Downstream of Labyrinth Weirs

In order to evaluate the flow characteristics downstream of a rectangular labyrinth weir including energy dissipation an experimental study was carried out. The objective was to develop a relation between drop height, discharge and the amount of dissipated energy. For the physical tests a 0.60 m wide flume with a length of 18.00 m and a height of 1.20 m was used. For the design of the stilling basin combinations of discharges and downstream water levels were analyzed. The results show that for the given conditions a simple concrete apron or a riprap protection corresponding to the hydraulic jump length is sufficient for erodible river beds. For low downstream water levels the energy dissipation occurs in a steady hydraulic jump closed to the weir. Raising the downstream water level, the hydraulic jump becomes submerged. Due to its geometrical shape, the labyrinth weir can ensure overall an effective energy dissipation.