Abstract
A heavy rainfall attacked the Otofuke river in 2011. Bank levee was eroded at that time, even though the water level at the flood was not reached a height of flood plain. It was assumed that the main factor of this erosion was the deflection of flow due to bar development. Hydraulic experiments were conducted in this paper for clarifying the influence of bar development to the bank erosion. It was found that bar migration speed and development situation of bars influenced bank erosion strongly and bank erosion affected to the form of sandbars.
