Author(s): M. Romero; H. Branez
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Abstract: The present paper illustrates the experimental quantification on a flume of scour processes downstream zigzag crested labyrinth weirs as a function of several variables like the opening angles between cycles, overflow heads, discharge coefficients and effective and total discharge lengths over the crests. Four different2-cycle labyrinth weirs in plan-view were tested for three steady discharges in fully aerated conditions. Fine uniform sand was used as mobile sediment and leveled parallel to a single channel slope. A laser bed profiler installed on top of the flume measured scour and erosion patterns in real time. Dimensionless groups of numbers were obtained for data analysis and the assessment of the structures' efficiencies in reducing scouring rates. Results show that a labyrinth weir with an opening angle of35o produced less scoured volumes and eroded areas in plan-view, minimum scoured depths and shorter erosion lengths compared to the other studied structures.
Year: 2009