Two-Phase Flow on a Gabion Stepped Spillway: Cavity and Seepage Air-Water Motion
نویسندگان
چکیده
On a stepped spillway, the steps contribute to some dissipation of the turbulent kinetic energy, while free-surface aeration can be very intense. The aim of this study is to investigate the two-phase flow properties on a gabion stepped spillway, including both free-surface and seepage flows, as well as the bubbly flow interactions at the gabion interface. Detailed measurements were conducted in a relatively large-size gabion stepped chute model. Using a combination of high-speed video movies and phasedetection probe measurements, the aeration processes in the step cavities and within the gabions were documented. The observations showed some very strong air-water interactions between seepage and step cavity flows. The results indicated a high level of interactions between two-phase seepage and cavity flows.
منابع مشابه
Air Entrainment and Energy Dissipation on Gabion Stepped Weirs
In the last three decades the design of stepped spillways regained some interest because of their suitability with new construction methods including gabion placement. In this study, the hydraulic performances of gabion stepped weirs were investigated experimentally in terms of the air-water flow properties and energy dissipation rate. A physical study was performed in a relatively large size f...
متن کاملStepped Spillway Flows and Air Entrainment
Stepped spillways have become a popular method for handling flood releases. The steps increase significantly the rate of energy dissipation taking place on the spillway face and reduce the size of the required downstream energy dissipation basin. The compatibility of stepped spillways with roller compacted concrete (RCC) and gabion construction techniques results in low additional cost for the ...
متن کاملTriple decomposition technique in air–water flows: Application to instationary flows on a stepped spillway
Self-sustained instabilities and pseudo-periodic motion may be observed in hydraulic structures and industrial flows. Documented examples include the hydraulic jump, sloshing motion in a reservoir and surging waves in pooled stepped spillways. The instabilities may generate some very large turbulence levels and integral turbulent scales, combining the contributions of both slow fluctuations and...
متن کاملFlow aeration, cavity processes and energy dissipation on flat and pooled stepped spillways for embankments
The design floods of several reservoirs were recently re-evaluated and the revised spillway outflow could result in dam overtopping with catastrophic consequences for some embankment structures. Herein a physical study was performed on flat and pooled stepped spillways with a slope typical of embankments (θ = 26.6◦) and four stepped configurations were tested: a stepped spillway with flat horiz...
متن کاملModeling of pattern and dissipating energy in the gabion stepedspillway using flow-3D
Characteristics and behavior of the flow in hydraulic structures, a complex phenomenon that isimperative to use software that will beto be study.Gabiony stepped spillway is a simple hydraulicstructures to control erosion downstream of dams, and, depreciation of structures is used. Roughstairway consisting of overflow from the stairs near the crest of the weir is started and continues tohave a l...
متن کامل