Abstract
The present study focuses on understanding the bank undercut mechanism under controlled conditions in a laboratory flume, using cohesive sediments collected from the toe region of Ganges River (India). The velocity data were analyzed to determine the turbulence characteristics such as mean velocities, Reynolds stresses, intensities and other higher order turbulence statistics. Wavelet analysis of velocity time series delivered knowledge on the frequency of occurence of the tubulent eddy scales. Results showed that large eddies are distributed at a lower frequency band upstream and downstream of the undercut regions, which enhance the bank undercut succession. However, for different Reynolds numbers, the generation of eddies is different which plays a significant role for different erosion rates.
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