2010 Volume 16 Pages 125-130
In this paper, the numerical analysis of the unsteady quasi-three-dimensional flow and the bed variation using the observed temporal changes in water surface profiles is conducted to elucidate the characteristics of the flood flow and the bed scouring during the 1981 flood in the Ishikari River mouth. This analysis enables to verify the reproducibility of bed variations over time during floods by calculating the temporal changes in water surface profiles to coincide with observed one. The transportation of suspended load in the flood flow is evaluated by the three-dimensional advection-diffusion equations of suspended load concentration calculated with the vertical distributions of velocities, which are obtained from the unsteady quasi-three-dimensional flow analysis.
