Session6: Water-related Disaster Risk Reduction
Title: URBAN INUNDATION ANALYSIS CONSIDERING THE WATER BEHAVIOUR OF SUBWAY
Daisuke Sato, Makoto Takeda, Masataka Murase, Naoki Matsuo
Recently, the risk and the countermeasures of water disaster has been examined for underground spaces in urban areas. In metropolitan areas subways and underground shopping malls are highly developed. If large scale inundation occurs there, flood damage becomes serious in the underground space. In Kyoto city and Fukuoka city, which are the target areas of this study, there are the risk of inundation due to the Kamo river flood and the Mikasa river flood, respectively. And Kyoto city and Fukuoka city have subway lines and underground shopping malls. Actually, the inundation disaster of the subway occurred at Fukuoka city in 1999 due to overflow from the Mikasa River. Moreover, in our study group, the urban inundation analysis model was developed in consideration of an analysis on the water behavior of underground spaces. In this study, the developed analysis model was applied to inundation situations in Kyoto city and Fukuoka city. From this study, analysis results show the feature of the inundation in Kyoto city and Fukuoka city. Moreover, flood water flowing into the underground spaces was reduce by the effect of the water stop board at the entrance of underground spaces. In addition, in the inundation analysis, analysis results using 10m grid are different from the analysis results using 50m grid, so in order to express the state of flooding in detail, the importance of detailed analysis is shown clearly.