Prediction of urban inundation and flooding of urban rivers caused by heavy rainfall and storm surge in Tokyo 23 wards

Masato Sekine*, Yonglin Wu, Wataru Baba, Kumiko Ogata

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

Abstract

In recent years, damage caused by heavy rainfall and typhoons has frequently occurred in various parts of Japan due to climate change. Countermeasure to this climate change is necessary especially in the coastal area, and it is important to investigate the influence of storm surge and typhoon on urban inundation. In light of this situation, the Flood Control Law, revised in 2015, created a system for publicizing the inundation areas related to largest possible flood, inland water and storm surges. For each possible impact, it is demanded in future to take appropriate measures. In this study, using the sophisticated urban inundation prediction system S-uiPS developed by the first author, we assumed that both large-scale torrential rain and storm surge would occur at the same time, and the process of inundation occurring in the 23 wards of Tokyo is examined. In 23 wards of Tokyo, the rainwater exclusion system consisting of roads, drainage pipes and urban rivers has been maintained, and inundation is reduced by draining the water to urban rivers. When the sea level goes up at the time of storm surge, the water surface elevation of the urban river which flows down to Tokyo Bay become higher. In this case, the inundation will occur due to the reverse flow to the drainage system through the storm-water outfall. The objective is to elucidate the range of storm surge effects in urban rivers, and to make clear the inundation process and the local inundation risk in urban areas.

Original languageEnglish
Publication statusPublished - 2020
Event22nd Congress of the International Association for Hydro-Environment Engineering and Research-Asia Pacific Division: Creating Resilience to Water-Related Challenges, IAHR-APD 2020 - Sapporo, Virtual, Japan
Duration: 2020 Sep 142020 Sep 17

Conference

Conference22nd Congress of the International Association for Hydro-Environment Engineering and Research-Asia Pacific Division: Creating Resilience to Water-Related Challenges, IAHR-APD 2020
Country/TerritoryJapan
CitySapporo, Virtual
Period20/9/1420/9/17

Keywords

  • Highly urbanize area
  • Numerical prediction
  • Storm surge
  • Torrential rain
  • Urban inundation

ASJC Scopus subject areas

  • Ecology
  • Environmental Engineering

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