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• W2185025992 abstract "Hydrodynamic aspects of unsteady (accelerating and decelerating) depth-varying open- channel flow over a gravel bed were investigated. Using acoustic Doppler and imaging methods, quasi- instantaneous profiles of velocity and sediment concentration were taken simultaneously and co-located with spatial and temporal resolution of turbulence scales. A high-speed camera allowed for fine sediment resuspension visualization. During the unsteady flow without fine sediment, the profiles of mean longitu- dinal velocity have a logarithmic shape in the inner layer. Bottom shear velocity at the beginning and at the end of the accelerating and decelerating unsteady flow ranges is similar and it increased more rapidly during the initial phase of the accelerating flow range than the mean velocity. This indicates that an inter- nal adjustment takes place which may affect the turbulence structure responsible for particle resuspen- sion. However, bottom shear velocity decreased linearly in the decelerating flow range. Fine sediment was resuspended in bursts and rapidly created nearly stationary ripples during the final phase of the acce- lerating flow range. Vortices shedding from the ripple crests produced most of the sediment resuspension in events, making resuspension intermittent. Hydraulic parameters, such as water depth, mean velocity time development and profile form were not affected by the presence of fine sediment particles." @default.
• W2185025992 created "2016-06-24" @default.
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• W2185025992 date "2010-01-01" @default.
• W2185025992 modified "2023-09-23" @default.
• W2185025992 title "Aspects of turbulence and fine sediment resuspension in accelerating and decelerating open-channel flow" @default.
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