Author(s): J. Merkel; F. Belzner; M. Gebhardt; C. Thorenz

Linked Author(s): Carsten Thorenz

Keywords: Energy dissipation; Labyrinth weir; Fixed weir; Waterway

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 dropheight, 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 and little energy will be dissipated. Due to its geometrical shape, the labyrinth weir can ensure overall an effective energy dissipation.

DOI: https://doi.org/10.15142/T32D2V

Year: 2018