Discharge coefficient for vertical sluice gate under submerged condition using contraction and energy loss coefficients

Vaheddoost, Babak; Safari, Mir Jafar Sadegh; Zeynali, Rasoul Ilkhanipour

doi:10.1016/j.flowmeasinst.2021.102007

Cited by 9 publications

(2 citation statements)

References 23 publications

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“…For bridges on complex terrain or crucial for flood control, MIKE 21 should be used to estimate upstream backwater depth for better accuracy. Vaheddoost et al [22] used energy and momentum equations to define the discharge process in a study of overflow calculation for gates under submerged flow conditions. They employed the implicit optimization method to determine contraction and flow coefficients.…”

Section: Introductionmentioning

confidence: 99%

Influence of Multi-Cross Structures on the Flood Discharge Capacity of Mountain Rivers in the Yellow River Basin

Song

Zhang

et al. 2023

Water

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This study investigates the impact of cross structures on flood occurrences in mountainous rivers. The governing equations of open channel flow were formulated based on the Saint-Venant equations. The open channel was segmented, and a node equation was established at each section’s connection point. An overflow model of bridges and weir dams was also developed. The physical model of the open channel was simplified and modeled using actual building data and model calculation requirements. The study found that the primary impact of weirs and bridges on the open channel was the backwater effect on the water level. The influence of these structures on the water level in the Huang Stream urban section in the Yellow River Basin was assessed under various working conditions. The results showed that deleting the #1 weir could reduce the maximum backwater height by 1.14 m, and deleting the #2 weir could reduce it by 1.09 m. While reducing the weir height significantly decreased the backwater range and height, it did not enhance the river’s flood discharge capacity. The Huang Stream contains 17 bridges, 13 of which could potentially affect flood discharge. The eight flat slab bridges in the submerged outflow state had a significant impact on flood discharge, with a maximum water level change of 0.51 m. Conversely, the three single-hole flat slab bridges in the free outflow state downstream had a negligible impact on flood discharge. The study found that bridges had a greater influence on flood discharge capacity than weirs. This research provides valuable insights for the reconstruction of cross structures in mountainous rivers and for managing flood discharge capacity and flood control.

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Section: Introductionmentioning

confidence: 99%

Influence of Multi-Cross Structures on the Flood Discharge Capacity of Mountain Rivers in the Yellow River Basin

Song

Zhang

et al. 2023

Water

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“…Flows where the downstream water level affects the upstream water level and the downstream water level is higher than the gate opening are expressed as submerged flow. In the literature, there are many studies examining the flow characteristics for free flow (Silva and Rijo, 2017;Ferro, 2018;Petrila, 2002;Hoseini and Vatankhah, 2021;Dou et al, 2020) and submerged flow (Vaheddoost et al, 2021;Bijankhan et al, 2017;Sauida, 2014;Shayan and Farhoudi, 2013;Shaddehi and Bijankhan, 2020) after the gate and investigating the flow around the weir in various geometries (Haghiabi et al, 2021;Hu et al, 2018;Zounemat-Kermani and Mahdavi-Meymand, 2019;Zhang et al, 2018;Tullis, 2011). However, the number of studies is limited for situations where the gate and weir structure are used sequentially in channels that are not rectangular.…”

Section: Introductionmentioning

confidence: 99%

Trapez Kanallarda Savak Kapağı ve Savaklarla Enerji Azaltımının Deneysel ve Sayısal Analizi

Gemici

KOCAMAN

VURAL

et al. 2022

Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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In open channels, only one of the sluice gates or weirs is often used for regulation purposes to limit the acceleration of flow through the channel and to help reduce the forces around the water structures. When the sluice gates are used single, depending on the tail water depth and the gate opening, all cases might experience free or submerged flow conditions and hydraulic jump might occur at the downstream. In this case, it is possible to damage the submerged or semi-submerged structures in this area due to the high flow velocity and high hydraulic energy at the downstream of the gate. The combination of weirs and gates can be preferred both to preserve the stability of the river bottom and to prevent damage to structures such as submerged pipes and transmission lines stretching across cross-sectional direction. In this study, the variation of the flow characteristics in the channel and around the pipeline extending across the channel cross-section was investigated when varying cross-sections weirs with the sluice gate are used together. Experimental flow velocity and water levels are measured for different discharges. These measurements were used to determine the boundary conditions of the computational fluid dynamics (CFD) software and to verify the flow property values obtained by CFD. After the verification, the velocity, pressure and specific hydraulic head values of the points that could not be measured experimentally with CFD software were also obtained. As a result of both experimental and numerical analysis, it has been seen that hydraulic head can be reduced significantly by using the gate and weir structures together. The effect of weir geometry on energy loss is clearly seen at high discharges. By using the two structures together, both the water depth in open channels will be kept at the desired level and possible damage due to water forces acting on underwater structures will be prevented.

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Energy loss and contraction coefficients-based vertical sluice gate’s discharge coefficient under submerged flow using symbolic regression

Shakouri

Ismail

Safari

2023

Environ Sci Pollut Res

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Discharge coefficient for vertical sluice gate under submerged condition using contraction and energy loss coefficients

Cited by 9 publications

References 23 publications

Influence of Multi-Cross Structures on the Flood Discharge Capacity of Mountain Rivers in the Yellow River Basin

Influence of Multi-Cross Structures on the Flood Discharge Capacity of Mountain Rivers in the Yellow River Basin

Trapez Kanallarda Savak Kapağı ve Savaklarla Enerji Azaltımının Deneysel ve Sayısal Analizi

Energy loss and contraction coefficients-based vertical sluice gate’s discharge coefficient under submerged flow using symbolic regression

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