Hydraulic Structures, Fourth Edition

doi:10.1201/9781315274898

Cited by 10 publications

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“…= 55.0265 and Reynolds No. equals to 26666.67that is acceptable for these results because the flow is turbulence due to the result of Reynolds number >2000 and Weber number> 11 to prevent viscous effects; this often necessitates avoiding surface tension and viscous effects, Weber numbers for intake models should be higher than 11 (Novak et al, 2001;Sturm, 2001;Novak et al, 2017) 1. Data processing The equations were used in the calculation above in Table 3:…”

Section: Resultsmentioning

confidence: 99%

Experimental Investigation about the Effects of Blockage on Upstream Box Culverts

Al-kmoly,

Majeed

2024

jcoeng

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This experimental study focuses on scouring in box culvert inlets under steady-state conditions and at different percentages of blockage ranging from 0% to 65%, and also looks at the hydraulics of water in the culvert. The investigation shows that the blockage of the culverts has influenced the scouring pattern at the blocked culverts' entrances. Ten experiments were carried out at the laboratory to see how blockage impacts the scouring pattern upstream of a box culvert during steady flow. Both partially blocked and unblocked cases were implemented in this study. The experimental tests were done until the equilibrium scour occurred, which took about 3.5 hours of water flow to reach equilibrium conditions. The results revealed that the blockage will increase the water depth at the inlet by about 30%–50%, which may affect the safety of structures or cause culvert failure. In addition, the results discovered that the maximum scour depth, which inversely correlated with the obstruction upstream of the box culvert, increased with increasing discharge.

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Section: Resultsmentioning

confidence: 99%

Experimental Investigation about the Effects of Blockage on Upstream Box Culverts

Al-kmoly,

Majeed

2024

jcoeng

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“…From Equation 4, it is obvious that the theoretical flow velocity represents a function of the flume upstream water depth [23,24]. For free flow condition:…”

Section: Fluid Fundamentalmentioning

confidence: 99%

An Investigating of the Impact of Bed Flume Discordance on the Weir-Gate Hydraulic Structure

Qasim

Mohammed

Abdulhussein

2022

HighTech. Innov. J.

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Discordance and concordance play a significant role in the hydraulic response for the flume, open channel, hydraulic structure, and flow field measurement. Bed discordance and bed concordance are regarded as common problems in open channels. Discordance is the dominant one, which could have an effect on the hydraulic structure that is constructed inside the channel. This paper deals with the impact of bed flume discordance on hydraulic flow characteristics at the weir-gate downstream hydraulic regime. Four configurations with different lengths and heights of the bed flume discordance are adopted here to investigate the impact of these configurations on the hydraulic characteristics. In addition, one configuration of the bed flume concordance is adopted to compare with the other four configurations. At downstream, the average water depth becomes dimensionless by dividing by upstream water depth, vertical distance between weir and gate, length of downstream, length of concordance, and length of discordance in order to evaluate the inequality in the distribution of Froude number. On one hand, certain results appear strongly between Reynolds number and Froude number at downstream, actual discharge and flow velocity at downstream, flow area past the gate and Froude number at downstream. On the other hand, there was a complex dramatic relation between the weir-gate discharge coefficient and Froude number at downstream. Overall, the study shows that there is a good relationship between specific energy, water depth, and flow speed. Doi: 10.28991/HIJ-2022-03-03-09 Full Text: PDF

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“…Not only is this process noisy, with disruption in the flow pattern, but -more importantly -if the cavity implodes against a surface, the violent impact of the water particles acting in rapid succession at very high pressures (of the order of 1000 atm), if sustained over some time, causes significant damage to the (concrete or steel) surface, which can lead to a complete failure of the structure. Cavitation corrosion (pitting) and the often-associated vibration is therefore a phenomenon that needs to be considered in the design of hydraulic structures and prevented whenever possible (Novak et al, 2007) In a gated conduit, an air vent is usually installed immediately downstream of the gate to provide sufficient air to the flow. Previous studies have shown that injecting air into the flow downstream of the gate can significantly reduce the risk of cavitation damage.…”

Section: Introductionmentioning

confidence: 99%

Role of Gate Type in the Air-Demand Ratio in Closed Conduits

Aydin,

Baylar,

Ozkan

et al. 2024

Journal of Applied Engineering Sciences

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Sluice and radial gates are common devices used to control flow in closed conduits. In high-head gated conduits, the high-velocity flow exiting the gate drags and entrains a lot of air. If the air demand of the flow is not met, the pressure drop downstream of the gate will cause structural damage or cavitation. Typically, an air vent is installed immediately downstream of the gate to supply sufficient air to the flow. In this study, the effect of the conduit gate type on the air-demand ratio was investigated. The results showed that the gate type had a very significant effect on the air-demand ratio. Significantly higher air-demand ratios were observed in the conduit with a sluice gate compared to the conduit with a radial gate. The results obtained will be useful in future modeling and design processes.

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Hydraulic Structures, Fourth Edition

Cited by 10 publications

References 0 publications

Experimental Investigation about the Effects of Blockage on Upstream Box Culverts

Experimental Investigation about the Effects of Blockage on Upstream Box Culverts

An Investigating of the Impact of Bed Flume Discordance on the Weir-Gate Hydraulic Structure

Role of Gate Type in the Air-Demand Ratio in Closed Conduits

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