NUMERICAL PREDICTION OF SPATIAL DISRIBUTION OF INUNDATION AREA USING FLOOD FLOW MODEL REGARDING DRIFTING VEHICLES

Abstract

 Flooding in urban areas can cause vehicles to float and drift away, causing collision damage to buildings and altering the inundation area by changing the flow of flood waters.

 In this study, an unstructured mesh inundation model and a numerical model that treats vehicles as a single rectangular element were made to develop a prediction method that takes into account the influence of vehicles in the evaluation of inundation areas. This method was applied to a hypothetical inundation analysis in an actual urban area. Calculated results predicted that the vehicle elements transported by the inundation flow would move, influenced by mutual collisions and collisions with elements representing buildings, and that the formation of agglomerations of multiple elements in some parts of the inundated area, which would obstruct the flood flow and cause changes in the spatial distribution of inundation depth.