Numerical assessment of the inception point in different stepped spillway configurations

Kaouachi, Anouar; Carvalho, Rita F.; Benmamar, Saâdia; Gafsi, Mustapha

doi:10.1007/s12517-019-4717-1

Cited by 5 publications

(4 citation statements)

References 32 publications

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“…The present information has been compared with those of previous investigations to check and validate the results. Dynamic pressure distribution based on experimental studies of Juon and Hager (2000), which is independent of Froude number F0, was expressed by the following equation: (6) Also Heller et al (2005) studied the dynamic pressure distribution based on physical models of different hydraulic and geometry characteristics. They introduced the following equation; (7) The forms of Equations 6 and 7, which show the dynamic pressure distribution along flip buckets are in reasonable agreement with the present study as given by Equation 5.…”

Section: Results and Analysismentioning

confidence: 99%

“…They may have a controlling device and some are thinner and multiply-lined if space and funding are tight. In addition, they are not 2 00 0 hV Ph gR  always intended to dissipate energy like stepped spillways, flip bucket or ski jump [5][6][7]. Chute spillways can be ingrained with a baffle of concrete blocks but usually have a "Flip Lip" and/or dissipator basin, which creates a hydraulic jump, protecting the toe of the dam from scour.…”

Section: Introductionmentioning

confidence: 99%

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Performance of Hydrodynamics Flow on Flip Buckets Spillway for Flood Control in Large Dam Reservoirs

Yamini

Kavianpour

Movahedi

2020

J. Hum. Earth Future

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Flip buckets are usually used in high head dams to dissipate the destructive energy of high speed jets. These structures are fixes at the end of the outlet conduits to direct the moving jet into the atmosphere. The process of energy dissipation also resumes, while the jet entering into its downstream plunge pool. Although studies of flow over flip buckets turn back to many years ago, but still there are uncertainties regarding the flow behaviour over these structures with various geometries and flow conditions. In this study, experimental measurements of static and dynamic pressures and their distribution over these structures are investigated. Measurements were made along two different simple flip buckets with various Froude numbers to determine the effects of the geometry and flow characteristics on pressure field. Maximum pressures are also presented and the results are compared with those of other investigations. The results of this study can be used to increase the safety of large dams that remain sustainable in the process of exploitation such as irrigation, human consumption, industrial use, aquaculture, and navigability. Doi: 10.28991/HEF-2020-01-01-05 Full Text: PDF

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Section: Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of Hydrodynamics Flow on Flip Buckets Spillway for Flood Control in Large Dam Reservoirs

Yamini

Kavianpour

Movahedi

2020

J. Hum. Earth Future

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“…The numerical studies by Kaouachi et al [34] and Wan et al [35] were instead focused on the localization of the inception point in stepped spillways; for pooled spillways it is closer to the spillway crest than for flat stepped spillways.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Hydraulic Properties of Flow over Different Pooled Stepped Spillways

Ghaderi

Abbasi

Francesco

2021

Water

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This work presents numerical simulations carried out to study the influence of geometric characteristics of pooled steps on the energy dissipation performance, flow patterns properties, velocity rates, and pressure distributions over a spillway. The localization of the inception point of air entrainment was also assessed, being a key design parameter of spillways. With this aim, different configurations of steps were taken in account, including flat, pooled, and notch pooled types. The computational procedure was first validated with experimental results from the literature and then used to test the hydraulic behavior derived from different geometric configurations. The flat step configuration showed the best energy dissipation performance as compared with other configurations. With the notched pooled step configuration, the efficiency performance of the pooled structure improved by about 5.8%. The interfacial velocities of the flat stepped spillway were smaller than those of the pooled structure. The pressure value at the beginning of the step in the pooled configuration was larger than the flat configuration, while for the notched pool the maximum pressure values decreased near the step pool. Pool configuration (simple or notched) did not have a significant influence on the location of air entrainment.

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“…e stepped spillway drainage structure dates back to 2500 years ago [10], and it has good energy dissipation; it can greatly shorten the length of the stilling pool and reduce the project's investment costs. With the development of roller concrete damming technology, this technique has been widely applied [11], and scholars both at home and abroad have conducted in-depth studies on it [12,13]. Wu et al [14] found that the location of the inception point of the air entrainment for the stepped spillway is much nearer to the top of the spillway than a smooth spillway, which led to the high energy dissipation ratio of the stepped spillway.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Stepped Spillways with Front Step Deformation

Zhang

et al. 2021

Mathematical Problems in Engineering

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In order to solve the flood discharge problem of both small- and medium-sized warping dams in the Loess Plateau, a stepped spillway scheme, based on an ecological bag, to achieve full-section water flow and energy dissipation has been proposed in this paper. The hydraulic and energy dissipation characteristics of a stepped spillway layout scheme were studied using 3D numerical simulation. As the height of the dams is low and the spillways are short, the research has shown that the traditional single-step layout scheme leads to a low overall energy dissipation rate due to the small amount of energy dissipated in the initial steps. As a result of this, this paper has put forward two kinds of step layout schemes such as the shunt type and the staggered type for the initial steps. Through analysis of the flow state, the pressure distribution, and the total energy dissipation rate, the results have shown that shunt type and staggered type with front step deformation produced an obvious mixing of the water flow, fewer negative pressure areas, and a higher energy dissipation rate. The optimal energy dissipation rate of the staggered type reached 87.75%, and the maximum energy dissipation rate was increased by 27.97%.

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Numerical assessment of the inception point in different stepped spillway configurations

Cited by 5 publications

References 32 publications

Performance of Hydrodynamics Flow on Flip Buckets Spillway for Flood Control in Large Dam Reservoirs

Performance of Hydrodynamics Flow on Flip Buckets Spillway for Flood Control in Large Dam Reservoirs

Numerical Study on the Hydraulic Properties of Flow over Different Pooled Stepped Spillways

Numerical Simulation of Stepped Spillways with Front Step Deformation

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