Fluctuating Pressures in Spillway Stilling Basins

Bowers, C. Edward; Tsai, Frank Y.

doi:10.1061/jyceaj.0002205

Cited by 27 publications

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“…The maximum lift force generated by turbulent pressure fluctuations acting on the bottom of the stilling basin results in poor sediment stability (Bowers and Tsai, 1969). If the lifting force is greater than the gravity of the sediment particles, no sediment will be deposited.…”

Section: Sediment Deposition At the Bottom Of The Stilling Basinmentioning

confidence: 99%

Numerical Simulation of Imported Sediment in a Stilling Basin

Wang

Han

et al. 2021

Front. Earth Sci.

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Sediment buildup at the bottom of a stilling basin can result in premature drainage of spillway structures and can even lead to dam failure in severe cases. Such failures pose ecological and human safety hazards to downstream areas. To evaluate the sudden discharge and potential dam failure associated with sediment buildup, we developed a two-dimensional two-phase flow simulation model built on a particle-based force balance equation. We compared the flow patterns and energy dissipation effects in the stilling basin at different inlet flows (2, 3, 4.5, and 6.75 m2/s), and the subsequent bottom deposition was compared across different sand discharge mass flow rates (0.1, 0.2, and 0.3 kg/s). The results show that the turbulent energy increased with the increasing inlet unit width flow rate. When more vortices were generated and the flow velocity was reduced significantly, the energy dissipation was more effective. The sediment deposition at the bottom of the stilling basin gradually increased with the decrease of inlet unit width flow and the decrease of the sediment mass flow rate. Meanwhile, at a fixed inlet shape, the change in inlet unit width flow had little effect on the maximum sedimentation height at the bottom of the basin. In addition, the average deposition rate at the bottom of the stilling basin was positively correlated with the inlet sedimentation concentration, and the correlation coefficient could be as high as 0.97. In this two-phase flow method, the error of the simulated value over the theoretical value was less than 10%. This simulation of sediment deposition at the bottom of the stilling basin provides a practical reference for dam managers.

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Section: Sediment Deposition At the Bottom Of The Stilling Basinmentioning

confidence: 99%

Numerical Simulation of Imported Sediment in a Stilling Basin

Wang

Han

et al. 2021

Front. Earth Sci.

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“…According to , the damages found in stilling basins are caused mainly by the pressure fluctuations, that were addressed in several works comprising hydraulic jumps: Vasiliev & Bukreyev (1967), King (1967), Bowers & Tsai (1969), Abdul Khader & Elango (1974), Akbari et al (1982), Lopardo (1986), among others. Marques et al (2017) list several types of damage that can occur in hydraulic structures: cavitation, abrasion, erosion, cracks, vibration-related damages, structural instabilities, hydraulic transient, etc.…”

Section: Introductionmentioning

confidence: 99%

Turbulent pressures at the position of maximum pressure fluctuation in hydraulic jump stilling basins

Júnior

Kipper

Ferreira

et al. 2023

RBRH

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Turbulent flow is responsible for a significant portion of damages and failures in dams. This paper sought to introduce novel approaches to the estimation of typical parameters used in the design of stilling basins. The standard deviations of pressure samples of 24 hydraulic jumps were analysed throughout the stilling basin longitudinal centreline, and the positions of maximum pressure fluctuation were identified. Next, mean and extreme pressures occurring at this position were calculated. Finally, these parameters were plotted against the inflow Froude number and curves were adjusted to the data. The position where maximum turbulence of undular, weak and oscillating jumps occurs varies according to the Froude number. Steady and strong jumps are more likely to induce negative pressures on the stilling basin. The findings of this paper broaden the knowledge on which regions of the stilling basin must receive special attention, and on how to minimize the chances of damages.

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Hager¹

1992

Energy Dissipators and Hydraulic Jump

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Fluctuating Pressures in Spillway Stilling Basins

Cited by 27 publications

References 0 publications

Numerical Simulation of Imported Sediment in a Stilling Basin

Numerical Simulation of Imported Sediment in a Stilling Basin

Turbulent pressures at the position of maximum pressure fluctuation in hydraulic jump stilling basins

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