Similarity of Local Scour Profiles Downstream of Stepped Spillways

Aminpour, Younes; Frounchi, Javad

doi:10.1007/s40999-017-0168-9

Cited by 14 publications

(6 citation statements)

References 10 publications

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“…A weir is a hydraulic structure that functions to raise the water level in a river by damming the flow [1]. This flow damming aims to direct the flow to enter the intake structure and then flow to the primary channel with a wider service range [2].…”

Section: Introductionmentioning

confidence: 99%

Safety Assessment of Irrigation Weirs by Modeling Local Scour Potential Downstream of Energy Dissipator

Tunas,

Ishak,

Saparuddin

et al. 2024

IJSSE

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The phenomenon of local scour downstream of irrigation weir energy dissipators is one of the basic degradation problems in hydraulic structures on rivers. The hydraulic jump in the stilling basin, which is triggered by flow turbulence due to energy dampening, forms current vortices in horizontal and vertical directions. Eddy currents that are not fully controlled and damped in the stilling basin can cause scouring, especially in the vertical direction just downstream of the energy dissipators construction. Simultaneous accumulation of scour in the long term can endanger buildings around the weir, especially the stilling basin, both downstream wings and the main weir. This paper aims to assess weir safety by predicting scour characteristics under end sill energy dissipators using the hybrid model: HEC-RAS and Scour Empirical Equation. The simulation is carried out on three conditions, namely minimum, average and maximum discharges with input of sediment grain gradations obtained from field measurements. The three types of discharge are obtained from the transformation of daily rainfall into daily discharge using the HEC-HMS Model. The results of scour predictions in the 3 scenarios were compared with the results of scour measurements at the study location. The results of the study indicate that the greatest scour depth at the maximum discharge of almost 1.5 meters has reached the depth of the end sill of the energy dissipator. This prediction result was also verified by the observation scour depth of more than 1.5 meters. Observation results also show that the Energy Dissipator II has collapsed massively both in the center and on the left and right sides of the energy dissipator. Based on the results of the study and investigation, it can be concluded that the weir safety at the study location can be categorized as low with the potential for very large scour.

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Section: Introductionmentioning

confidence: 99%

Safety Assessment of Irrigation Weirs by Modeling Local Scour Potential Downstream of Energy Dissipator

Tunas,

Ishak,

Saparuddin

et al. 2024

IJSSE

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“…Water delivery capacity is an important hydraulic parameter for the water delivery tunnel, and it is necessary to calculate the maximum flow rate accurately. Currently, the methods employed for assessing the water conveyance capacity of tunnels include theoretical calculation, scale model testing, and numerical simulation [8][9][10]. Nevertheless, due to the influence of transition side walls, variations in wall roughness, and operating conditions, the discharge obtained through theoretical calculation methods often results in significant errors [11,12].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Hydraulic Performance and Arrangement Optimization of Non-Prismatic Water Conveyance Tunnel—A Case Study of Project X

Li,

Yuan,

Zhao

et al. 2024

Water

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The water conveyance tunnel is an important hydraulic structure in water conservancy projects. Typically, it manifests as a non-prismatic tunnel due to variations in the cross-sectional geometry, which give rise to an unpredictable flow pattern that significantly impacts the secure and stable operation of the tunnel. This study takes water conservancy project X as a case and investigates the hydraulic performances of a non-prismatic water conveyance tunnel using a scale model test and numerical simulation; the hydraulic performance, such as flow pattern, discharge, flow velocity, and water depth profile are analyzed for both free flow and submerged flow conditions. The results show that the simulation data fit well with the experimental value observed in the scale model test for free flow; however, a substantial discrepancy emerges under submerged flow conditions. This discrepancy is attributable to the presence of a vacuum in the distortional plan section. Notably, the effect of water entrainment phenomena on flow rate and velocity is diminished in the scale model test, emphasizing the advantage of numerical simulation in predicting hydraulic parameters for the prototype. On this basis, the optimization of the gate shaft arrangement is executed through numerical simulation; the results indicate that the vacuum issues in the contraction section were partially resolved through structure optimization. The simulation values are close to the experimental results, and the modified design of the tunnel can be used in a water conveyance project.

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“…For example, some researchers examined the flow characteristics of the stepped spillways using box gabions (Peyras et al 1992;Wuthrich & Chanson 2015;Zuhaira et al 2020). Some researchers have also examined the amount of scouring downstream stepped spillways (Tuna & Emiroglu 2013;Aminpour & Farhoudi 2017;Eghlidi et al 2020). Felder et al (2012aFelder et al ( , 2012b) conducted many experimental studies about pooled stepped spillways that used different step heights and chute channel angles.…”

Section: Introductionmentioning

confidence: 99%

Stepped spillway design for energy dissipation

Ikinciogullari

2023

Water Supply

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Important water structures known as stepped spillways are used to dissipate energy, aerate rivers, and reduce the cost of the downstream pool. The aim of this study is to increase the energy dissipation rate by proposing an alternative design to the flat stepped spillways, which are frequently used in practice. For that reason, the Circular Stepped Spillway (CSS) has been constructed and numerically investigated in this paper. The energy dissipation rate of the CSS and the flat stepped spillway has been compared using three different models and discharges. According to the simulation findings, the CSS performs better as the step radius gets smaller. The CSS models with step depths of 0.50, 1.50, and 2.50 cm have dissipated up to 21.4, 38, and 50.7% more energy than the flat stepped spillway, respectively.

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Similarity of Local Scour Profiles Downstream of Stepped Spillways

Cited by 14 publications

References 10 publications

Safety Assessment of Irrigation Weirs by Modeling Local Scour Potential Downstream of Energy Dissipator

Safety Assessment of Irrigation Weirs by Modeling Local Scour Potential Downstream of Energy Dissipator

Investigation of Hydraulic Performance and Arrangement Optimization of Non-Prismatic Water Conveyance Tunnel—A Case Study of Project X

Stepped spillway design for energy dissipation

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