Sediment Movement over Type A Piano Key Weirs

This investigation deals with the mechanics of movement singular quartz gravel and coarse sand riverbed particles upstream over inlet key three Type A piano weir (PKW) models, which were recorded a high-speed camera. Acoustic Doppler velocimeter was used to obtain bed shear stress. The sediment threshold regime compared previous investigations found be within ranges. Generally, particle decelerates as it approaches key, but accelerates due flow contraction an increase in Rolling saltation regimes observed key. maximum velocity at end highest 1-cycle model, then 2-cycle 3-cycle model. Computational fluid dynamics (CFD) simulation shows rapid stress end. For PKW required 17%–43% additional on pass study is useful for in-channel application flushing it.