EFFECTS OF BRIDGE GIRDERS ON THE 2020 KUMA RIVER FLOOD BASED ON 3D INTEGRATED SIMULATION OF RIVER AND INUNDATION FLOW

Abstract

 Based on the Kuma River flood caused by the torrential rainfall in July 2020, this study developed a three-dimensional inundation analysis model that can evaluate the hydrodynamic forces of river bridges and examined the effects of them on flood flows from various angles. As a result, it was confirmed that the our model can take into account changes in the vertical velocity distribution of river flow due to its girder height and shape. The effects of them were suggested that the rapid rise in water level caused by multiple bridges contributes to damage to houses and human casualties in the flooded area.