Flow and Bed-Features Dynamics in Seepage Affected Alluvial Channels
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This study, using an experimental approach, focuses on the effect of downward seepage on a threshold alluvial channel morphology and corresponding turbulent flow characteristics. Experiments have been carried out in a curvilinear cross-sectional shaped channel with two different sediment beds i.e., fine (median diameter = 0.41 mm) and coarse (median diameter = 0.41 mm) sands under no seepage and with seepage conditions. It has been observed that an alluvial channel, which remained at threshold condition of sediment movement during the no seepage experiment, started transporting sediments after the application of seepage in a vertically downward direction. In experimental methodology, Acoustic Doppler Velocimeter developed by Nortek was used to measure instantaneous flow velocities in streamwise, transverse and vertical directions in both the conditions. Bed elevation variations were recorded by using Ultrasonic Ranging System at different time intervals in the presence of seepage.
Supervisor: Bimlesh Kumar