Hydraulics of sharp-crested weir culverts with downstream ramps in free-flow, partially, and fully submerged-flow conditions

Salehi, Saeed; Azimi, Amir H.; Bonakdari, Hossein

doi:10.1007/s00271-020-00695-y

Cited by 12 publications

(2 citation statements)

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“…Energy losses across weirculvert models were computed as well, and they reduced with submergence. Four weir-culvert models with varying weir heights, ramp lengths, and culvert heights were examined [11].…”

Section: Introductionmentioning

confidence: 99%

Improvement of the Performance of multi-vents culvert under different flow conditions

Shaheen,

Ali Refaey Eltoukhy,

Abdelsattar

et al. 2024

Engineering Research Journal (Shoubra)

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The culvert is a structure that allows water to flow under a road, railway, or corridor, and it is one of the important water facilities due to its use in many practical applications. These facilities are used in crossing small waterways under roads, as well as in crossing seasonal waterways that are used to collect rainwater to resist torrential rains in rainy valleys. and their proper design is critical to ensure a safe and reliable transportation network, but there are some problems facing the structure, such as blockage, soil collapse, and closure due to the maintenance period and head losses. The performance of the culverts must be improved, the head losses must be reduced, and the best of hydraulic structure must be chosen. Where, the selection of number of pipes with area equivalent to area of one pipe and different discharges from 1.59 lit./sec to 16.88 lit/sec and various submergence ratio (1.5, 2, 2.4). the effect of the existence pipe (or pipes) culvert on the flow characteristic such as, water depth (upstream and downstream), submerged ratio, flow intensity or (pipe Froude number) and energy loss were investigated and analyzed using a series of figures to identity the best case from hydraulic point of view.

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Section: Introductionmentioning

confidence: 99%

Improvement of the Performance of multi-vents culvert under different flow conditions

Shaheen,

Ali Refaey Eltoukhy,

Abdelsattar

et al. 2024

Engineering Research Journal (Shoubra)

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“…Many researchers have classified the flow over weirs between free and fully submerged flow based on the submergence ratio, t/h. The flow regimes describing different levels of submergence are called impinging jet, surface jet, and surface wave regimes Rajaratnam 1996 and1998;Azimi et al 2016;Salehi et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Hydraulics of flow over full-cycle cosine and rectangular sharp-crested weirs

Azimi

Salehi

2022

Can. J. Civ. Eng.

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Laboratory experiments were carried out to investigate the hydraulic characteristics of full-cycle cosine and rectangular sharp-crested weirs in free flow condition. The head–discharge relationships of full-cycle cosine weirs were determined theoretically and the discharge coefficients were correlated with weir geometry for both rigid and erodible bed conditions. The proposed model showed higher discharge coefficients in full-cycle cosine weirs in comparison with rectangular sharp-crested weirs. The three-dimensional velocity profiles of full-cycle cosine and rectangular weirs were measured by an acoustic Doppler velocimeter probe. The effects of weir geometry on mean flow and local erosion upstream of the weirs were studied for two sediment sizes of 0.7 mm and 1.2 mm. The time-averaged velocity profiles exhibited strong three-dimensional flow in full-cycle cosine weirs. The strength of the upper eddy in the crest location of full-cycle cosine weirs decreased by increasing the weir gap opening and the jet stream deflected upward due to uneven eddy sizes. The maximum streamwise velocity of cosine weirs increased by four times the average velocity at the crest level of the weir and the transverse velocity profiles captured strong vortices in the vertical plane closest to the weir. The effect of weir gap opening of full-cycle cosine weirs on the total scour volume was studied for two sediment sizes. It was found that the scour volume in the upstream region of cosine weirs was higher than the scour volume formed upstream of a rectangular weir with the same opening.

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