Abstract
Based on the physical model test method, the dynamic cause of local scouring is explored. Result shows that uneven distribution of vertical turbulence intensity of near-bottom flow is the main driving force for local scouring. Distribution characteristics of vertical turbulence intensity of the near-bottom flow determine the spatial shape of the local scouring, that is, the range and the extreme-deep point of the local scouring correspond to the position of the strong turbulent zone and maximum value respectively. When the effect of the near-bottom strong turbulence zone on the riverbed is completely isolated, local scouring disappears, otherwise it will occur in the uninsulated part.
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