Numerical simulation of urban inundation processes and their hydraulic quantities – tsunami analysis hackathon theme 1 –

Tomohiro Yasuda, Kentaro Imai, Yoshinori Shigihara, Taro Arikawa, Toshitaka Baba, Naotaka Chikasada, Yuuki Eguchi, Masato Kamiya, Masaaki Minami, Toshiharu Miyauchi, Kazuya Nojima, Kwanchai Pakoksung, Anawat Suppasri, Yuho Tominaga

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The detailed understanding of tsunami hazard risk using numerical simulations requires a numerical model that can accurately predict tsunami inundation phe-nomena on land. In such models, the structural effects are indirectly considered using the variation of bottom roughness as a proxy for the differences in building densities. Only a few studies have conducted inter-model tests to investigate tsunami inundation in complex coastal urban cities. During the tsunami analysis hackathon held in September 2020, eight research groups met to have a detailed discussion on the cur-rent urban inundation problems. In this study, we conducted an intermodel comparison of the numerical tsunami models, using the data from physical experiments that were performed on a detailed urban model. Our objective was to investigate the necessary conditions of an accurate numerical model based that can ensure high reproducibility and practicality. It was confirmed that the accuracy of topographic data is an important parameter for tsunami inundation simulations in complex urban areas. Based on the computa-tional cost and accuracy, we suggest that a resolution of 1 cm of topographic data is a sufficient condition for tsunami inundation simulations on 1/250 scale model.

Original languageEnglish
Pages (from-to)978-993
Number of pages16
JournalJournal of Disaster Research
Issue number7
Publication statusPublished - 2021


  • Numerical models
  • Re-producibility
  • Topography data
  • Tsunami analysis hackathon
  • Tsunami inundation simulation

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Engineering (miscellaneous)


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