Flow hydrodynamics near inlet key of Piano Key Weir (PKW)

Tiwari, Harinarayan; Sharma, Nayan

doi:10.1007/s12046-015-0423-1

Cited by 4 publications

(2 citation statements)

References 33 publications

(24 reference statements)

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“…However, the construction of a transverse hydraulic structure leads to increase in the upstream flow depth and reduction in flow velocity which results into non-uniformity in flow and sediment discontinuity (Bai and Duan 2014;Fan and Morris 1992;Tiwari and Sharma 2015). This may further deposits sediment in the backwater or transports it to the weir during the heavy flood events, thus hampering the channel navigation and may result in upstream inundation (Noseda et al 2019).…”

Section: Manuscript_r1mentioning

confidence: 99%

“…as reported in several review studies by Abhash and Pandey (2020); Crookston et al (2019); Erpicum et al (2017); Oertel (2018), but it appears that a very limited study (possibly the only one by Noseda et al (2019)) has been performed on the sediment movement over PKW. The previous investigations by Sharma and Tiwari (2013); Tiwari and Sharma (2015) were mainly based on visual observations and limited to suspended load transport and threshold of the lifting of sediment upto 2 3 mm. Noseda et al (2019) carried out an experimental study on the self-cleaning capacity of PKW and examined the upstream riverbed scour behavior and flushing of sediments over the weir.…”

Section: Manuscript_r1mentioning

confidence: 99%

See 1 more Smart Citation

Sediment Movement over Type A Piano Key Weirs

Kumar

Kadia

Ahmad

2021

J. Irrig. Drain Eng.

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

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