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For instance, the clear-cut role of turbulent coherent structure on sediment threshold
is yet to be fully understood. Although there were some attempts, the flow fields
were captured at least a couple of millimeters above the bed particles. Thus, the
exact interaction between the particles and the fluid, in the level of particle micro-
mechanics in association with the probabilistic feature of turbulence eddies, has not
been completely revealed. Also, not many researchers have tried to explore the
threshold of sediment entrainment for water worked beds. It is believed that the
sediment threshold for water worked beds is different from those of manmade beds.
Moreover, sediment threshold under the sheet flows or shallow flow depths seems
to remain unattended. Therefore, further studies are required on these cases.
References
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