Inflation and Deflation of Rubber Dam

Kumar, Arun; Islam, Shahid Ul

doi:10.1016/b978-0-12-812210-5.00006-7

Cited by 6 publications

(6 citation statements)

References 13 publications

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“…In flooding conditions, the water was enriched with phosphorus supplied from sediment and was flushed downstream by the rain-swollen inflow. The concentrations at both the inflow and outflow converged to that of the inflowing water because the water body was completely replaced with new water by automatic deflation of the weir in flooding condition (Kumar and ul Islam 2019). This process is similar to a "reset" function for the impoundment.…”

Section: Discussionmentioning

confidence: 93%

“…The purpose of this operation is for prevention of flooding and it will be inflated again after the flood is over. During deflation of the weir, stored water is completely released (Kumar and ul Islam 2019). Both the inflow and outflow concentrations converged to the concentration in the inflowing water because the water body was completely replaced with new water.…”

Section: Release Of Enriched Nutrient Water During a Flood Eventmentioning

confidence: 99%

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Effect of in-stream impoundment on water quality of a suburban stream

et al. 2020

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This study aims to confirm the effect of a small stream impoundment on phosphorus and nitrogen dynamics in a suburban watershed. The results show that the phosphate concentration in the water body was significantly higher than that in the inflowing water under ordinary flow conditions. The phosphorus promotes algal growth that causes significant diurnal dissolved oxygen variation because of photosynthesis and respiration. The phosphate exchange between the sediment and overlying water was mainly controlled by diffusion flux rather than by advective flux seepage because of large amounts of phosphorus accumulated on the surface of the sediment. When a flood occurs, the phosphorus-enriched water is flushed downstream by rain-swollen currents. In summary, an impoundment affects in-stream phosphorus concentration through organic matter degradation and the release of phosphate in the sediment.

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Section: Discussionmentioning

confidence: 93%

Section: Release Of Enriched Nutrient Water During a Flood Eventmentioning

confidence: 99%

Effect of in-stream impoundment on water quality of a suburban stream

et al. 2020

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“…As the D/S diversion channel is about 1000 m long and made of a trapezoidal cross section with two side slopes of 2 vertical to 3 horizontal each and (1.50) m average bed level as shown in Figure (15), the second proposal would be constructing a new lock within that channel. A new unconventional lock chamber could be constructed without two wing walls through the U/S part of the diversion channel as shown in Figure (16). To ensure safe navigation depth during low discharge period (winter season), the existing bed level along the whole length of the D/S diversion channel would be dredged to a level of (0.50) m as shown in Figure (17).…”

Section: Proposal (2): Using An Unconventional Lockmentioning

confidence: 99%

“…The U/S gate of the existing lock be then reused as a D/S gate for the proposed conventional lock chamber. In this case, the existing bed level along the whole length of the D/S diversion channel would be dredged to (0.50) m as shown in Figure (16). Also, the bed level should be gradually ramped down from (1.50) m to (0.50) m.…”

Section: Proposal (3): Using a Conventional Lockmentioning

confidence: 99%

Solutions Proposed for the Navigation Problem Downstream Zefta Barrages

Fahmy

Hekal

2020

JES. Journal of Engineering Sciences

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The Nile navigable Damietta branch extends between Cairo and Damietta open seaport on the Mediterranean. For safe navigation throughout the branch, a 2.30 m minimum flow depth (MFD) is required. A recovery project to improve the branch navigation was started in 1999 and completed in 2005. The project was to implement a 40 m wide navigable waterway. About 6.50 million m3 of bed materials had been removed from bottlenecks at $ 18.20 million cost. In 2003, the construction of a new lock of 150.0 m length, 17.0 m width and (1.50) m bed level was completed on Zefta Barrages (ZB) east side to meet the navigation requirements. The barrages are located at Km 119.625 downstream (D/S) El-Roda g auge station. However, the resulting water stage (WS) D/S (ZB) during low discharges was insufficient to provide the MFD. Field studies were conducted to reveal the reasons. They found the branch flow carrying capacity had increased due to excessive dredging which caused a decline in WSs D/S (ZB). Analyzing the hydrologic and topographic conditions, two solution concepts were reached; either to raise the WS by 0.70 m or to lower the bed level of the diversion channel located D/S the new lock by 1.0 m. Therefore, this study aims to introduce solutions to overcome the problem. The solutions are to use a D/S rubber weir for raising the WS or construct a new lock within the D/S diversion channel for lowering the bed level or build new barrages with a new lock.

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“…Inflatable weirs are popular solutions form any engineering and environmental problems, such as irrigation, power generation, flood control and environmental improvement (Zheng et al 2021). Inflatable weirs, also known as rubber dams, are flexible elliptical structures made of rubberized material attached to a concrete foundation and inflated by air, water, or a combination of them (Kumar & ul Islam 2019). In recent years, using rubber dams in developing countries has substantially grown due to the more durable of rubber membrane (Saleh & Mondal 2001).…”

Section: Introductionmentioning

confidence: 99%

The hydraulic investigation of inflatable weirs

et al. 2022

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In this research, the models of Inflatable weirs with internal pressures of 0.5 and 1.4 at three heights of 0.15 m, 0.2 m, and 0.25 m were constructed. The deflectors were used in two geometric sections, including rectangular and triangular shapes, and they were installed at angles of 30, 45, and 60 degrees downstream of the weir body. The results showed that the value of the Cd changes between 0.28 and 0.35 while the range of the ratio of the upstream flow head on the crest to the radius of the downstream side of the inflatable weir varies between 0.2 and 1.5. The flow by crossing over the inflatable weir and colliding with the surface of the downstream stilling basin loses its energy by about 10–85%. The relative horizontal distance of the projectile-jet from the crest varies between 1.6 and 2.8. The effect of the deflector on the Cd is negligible due to being located in the supercritical part of the weir. Examination of the obtained results declared that deflector has considerable effect on energy dissipation.

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Inflation and Deflation of Rubber Dam

Cited by 6 publications

References 13 publications

Effect of in-stream impoundment on water quality of a suburban stream

Effect of in-stream impoundment on water quality of a suburban stream

Solutions Proposed for the Navigation Problem Downstream Zefta Barrages

The hydraulic investigation of inflatable weirs

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