Pressure Hydraulic Sediment Flushing on short dams
Journal Title: Journal of River Engineering - Year 2014, Vol 2, Issue 9
Abstract
Several methods have been proposed to control sedimentation process. These may include catchment’s management, flushing, sluicing, density current venting and dredging. Flushing is used to erode previously deposited sediments. In pressurized flushing, the sediment in the vicinity of the outlet openings is scoured and a funnel shaped crater is created. In this study, the effect localized vibrations in the sediment layers on the dimensions of flushing cone was investigated experimentally. For this purpose, experiments was carried out with tow bottom outlet diameters, five discharges release for each desired depth of water and one water depth above the center of bottom outlets. The results indicate that the volume and dimensions of flushing cone are strongly affected by localized vibrations. Results showed that, relative to the position of vibrating dam and hydraulic vibration frequency parameters Rsvbshvyy phenomenon is important so that the vibrations, scour scour hole average width of 273% and 239% compared to without the vibrations increase is increased. Most sediment volume output of the vibration frequency of 50 Hz and approximately 2 times the volume of sediment removed from the mode frequency is 20 Hz
Authors and Affiliations
Sadegh Mazloum shahraki - Asgar Ahadpour - Asadollah Mardashty Mardashty
Keywords
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