Comparison of Bedload Drainage Efficiency of Ogee Weir, Labyrinth Weir and Piano Key Weir
Keywords:
Sediment transport, Weir, Sediment deposition, Physical modelAbstract
The problem of sedimentation in upstream weirs occurs in most weirs that perpendicularly sited on flow direction. One of the solutions to reduce this problem is to design the weir in such a way that the sediment can easily flow away under the force of the water flowing over the weir. In this paper, a comparison of bedload drainage efficiency of Ogee weir, Labyrinth weir, and Piano Key weir is presented. The physical model was used to simulate bedload transport through the weir with and without sediment discharge gate. The suitability of using a weir depends on the sediment deposition characteristics of the bedload at the upstream weir, the typical of sediment discharge through the weir, and the volumetric ratio of the bedload discharge. The results of this study show that the Labyrinth weir and the Piano Key weir have the best efficiency in discharging sediment through a weir with and without a sediment discharge gate respectively. The shape of the Piano Key weir allows the sediment to be easily flushed out by the force of the water. While the Labyrinth weir accumulate a lot of sediment inside the weir, the sediment can be discharge when the sediment discharge gate is opened. The Piano Key weir is suitable for rivers where no sediment discharge gate is installed. In rivers where a sediment discharge gate can be installed, the Labyrinth weir should mainly used.
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