QUASI-THREE-DIMENSIONAL CALCULATION OF BED DEFORMATION CONSIDERING SUSPENDED LOAD DISTRIBUTION IN RIVER MOUTH

Abstract

A quasi-three-dimensional numerical model is developed to simulate riverbed deformation in the river mouth. The advantage of this model is that it enables to consider cross-sectional-velocity distribution with secondary flow and suspended load distribution in meandering channel. This model is tested on the downstream of the Ishikari River using the average value of annual maximum discharge. The calculated results of flow velocities and stable bed deformation is confirmed with the observations of 1979-year channel. As the conclusion, the model is capable to simulate floating act of the suspended load and local scour near the riverbank.