Abstract
Vertical distributions of fine particle sediments have been observed during floods by a specially designed sampler. The samples were analyzed through the Coulter Counter to obtain the grain size distribution. For each grain size range, the observed vertical distributions of the concentration are compared with Rouse's solution. The reference concentration at 5% of the depth from the bottom extrapolated by the solution are compared with the semi-experimental estimation by Lane using the grain size distribution of the bed material which was also taken during the flood.
