PREDICTION OF INUNDATION IN URBAN RESIDENTIAL AREAS WITH STEEP SLOPES

Abstract

 In recent years, the effects of global climate change have led to an increasing possibility of unprecedented large-scale torrential rainfall events. In Kanazawa, Yokohama, the target area of this study, both coastal and inland areas have been inundated by Typhoon No. 15 in 2019 and other occasions. In this study, S-uiPS, a sophisticated urban inundation forecasting method, is used to evaluate the inundation risk by uniformly applying the maximum expected rainfall to the target area. Because the target area includes a residential area developed on a steep slope, the S-uiPS was modified to newly account for water movement through steep slopes such as cliffs. Using this enhanced S-uiPS, flooding prediction results were obtained for areas including residential areas that could not be calculated before.