NUMERICAL CALCULATION OF SURFACE WAVES DURING A FLOOD ON THE TOYOHIRA RIVER USING ONE-DIMENSIONAL BOUSSINESQ EQUATION MODEL

Abstract

Numerical simulation of a flood event is made, using a one-dimensional Boussinesq equation model. Flood generation factors and occurrence conditions are employed for model calibration. The simulated results are verified by comparison with video images of surface waves taken during the flood period. The numerical simulation is used to study the mechanism whereby the surface waves are generated. The numerical model seems to be able to accurately reproduce the water waves that occurred during flood period in 1981. The simulated results show that the surface waves grew when they came into phase with the antidunes. The simulated results confirm that the phenomenon is related to Froude number.