Experimental study on vertical velocity and submergence depth near Piano Key weir

Sharma, Nayan; Tiwari, Harinarayan

doi:10.1201/b15985-14

Cited by 19 publications

(6 citation statements)

References 5 publications

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“…0.2-0.5 cm near the bed and the same were gradually increased towards the free surface. The recorded raw data were filtered based on minimum SNR of 15 and minimum COR of 70 [20][21].…”

Section: Experimental Conditionsmentioning

confidence: 99%

Experimental Study of Flow Field and Movement of Sediment over a Ramp

Kumar¹,

Kadia²,

Ahmad³

2019

J. Civ. Eng. Constr.

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Applications of hydraulic structures in low dams and diversion structures in countries like India, where sediment is a serious concern, demands a good expanse of research on the flow field and movement of sediment. The present study was focused on the non-uniformity in the velocity distribution along the flow direction and the movement of sediment over a ramp. The velocity distribution of the flow near and over the ramp was studied with the help of Acoustic Doppler Velocimeter. Experiments were conducted to study the mechanics and kinematics of movement of sediment particles. The movement of sediment particles over the smooth ramp was studied with the help of high-speed camera system. The particle velocity, acceleration, applied force and the angle of velocity vector were processed and analyzed from the captured images using digital image analysis techniques. The path of the movement of sediment particle was tracked. The vector results of the flow pattern indicated a very high amount of increase of the uplift velocity (y – component of the instantaneous flow velocity) component over a ramp. The sediment had very little movement for about 3.8 seconds at the beginning of the ramp and accelerated as it moved along the ramp in the downstream side. The path of the sediment movement over the ramp was found to be inclined by 25.6 to 35.7 degree to the horizontal axis which was almost parallel to the ramp (29.055 degree).

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“…0.2-0.5 cm near the bed and the same were gradually increased towards the free surface. The recorded raw data were filtered based on minimum SNR of 15 and minimum COR of 70 [20][21].…”

Section: Experimental Conditionsmentioning

confidence: 99%

Experimental Study of Flow Field and Movement of Sediment over a Ramp

Kumar¹,

Kadia²,

Ahmad³

2019

J. Civ. Eng. Constr.

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“…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%

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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“…A Piano Key Weir is a kind of labyrinth hydraulic structure in general placed transversely to rivers that causes flow discontinuity and affects hydraulics of rivers (Erpicum et al 2011;Laugier et al 2012;Ouamane 2013a). General transverse structures like weir (triangular or rectangular) have a significant function to maintain upstream depth of water and securing water resources for optimum use (Lempérière & Ouamane 2003;Lempérière et al 2011;Nayan Sharma & Tiwari 2013;Ouamane 2013b;Ribeiro et al 2013;Sharma et al 2012). However, it destabilizes sediment continuity because flow velocity reduced due to the increased water depth (Bai & Duan 2014;Fan & Morris 1992).…”

Section: Piano Key Weirmentioning

confidence: 99%

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

Tiwari

Sharma

2015

Sadhana

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This paper presents fundamental outcomes from an experimental study on the hydrodynamic performance near inlet key of Piano Key Weir (PKW). Hydrodynamic performance was tested in a circulated open channel that comprised of PKW and sand bed (d 50 = 0.25 mm). Instantaneous velocities were measured at 20 cross sections using Laser Doppler Velocimeter (LDV) with constant discharge and depth. Average velocity and turbulence intensities in both directions were investigated. Average longitudinal velocities are found very much consistent at every point and maximum around the midway of inlet key. In transverse direction, flow is bifurcating in two directions which are also confirmed by average transverse velocity estimation. Variation of turbulence intensity presents average 10 times higher transverse turbulence than longitudinal turbulence near inlet key of PKW.

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Experimental study on vertical velocity and submergence depth near Piano Key weir

Cited by 19 publications

References 5 publications

Experimental Study of Flow Field and Movement of Sediment over a Ramp

Experimental Study of Flow Field and Movement of Sediment over a Ramp

Sediment Movement over Type A Piano Key Weirs

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

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