Numerical Simulation of Urban Inundation Processes and Their Hydraulic Quantities – Tsunami Analysis Hackathon Theme 1 –

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  • Yasuda Tomohiro
    Faculty of Environmental and Urban Engineering, Kansai University
  • Imai Kentaro
    Yokohama Institute for Earth Sciences, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Shigihara Yoshinori
    Department of Civil and Environmental Engineering, National Defense Academy (NDA)
  • Arikawa Taro
    Faculty of Science and Engineering, Chuo University
  • Baba Toshitaka
    Graduate School of Technology, Industrial and Social Sciences, Tokushima University
  • Chikasada Naotaka
    Earthquake and Tsunami Research Division, National Research Institute for Earth Science and Disaster Resilience (NIED)
  • Eguchi Yuuki
    Department of Civil and Environmental Engineering, National Defense Academy (NDA)
  • Kamiya Masato
    Graduate School of Technology, Industrial and Social Sciences, Tokushima University
  • Minami Masaaki
    Meteorological Research Institute, Japan Meteorological Agency (JMA)
  • Miyauchi Toshiharu
    Faculty of Science and Engineering, Chuo University
  • Nojima Kazuya
    R&D Center, Nippon Koei Co., Ltd.
  • Pakoksung Kwanchai
    International Research Institute of Disaster Science (IRIDeS), Tohoku University
  • Suppasri Anawat
    International Research Institute of Disaster Science (IRIDeS), Tohoku University
  • Tominaga Yuho
    IDEA Consultants, Inc.

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<p>The detailed understanding of tsunami hazard risk using numerical simulations requires a numerical model that can accurately predict tsunami inundation phenomena 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 intermodel 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 current 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 computational 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.</p>

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