Numerical Simulation of Urban Inundation Processes and Their Hydraulic Quantities – Tsunami Analysis Hackathon Theme 1 –
Tomohiro Yasuda*1,, Kentaro Imai*2, Yoshinori Shigihara*3, Taro Arikawa*4, Toshitaka Baba*5, Naotaka Chikasada*6, Yuuki Eguchi*3, Masato Kamiya*5, Masaaki Minami*7, Toshiharu Miyauchi*4, Kazuya Nojima*8, Kwanchai Pakoksung*9, Anawat Suppasri*9, and Yuho Tominaga*10
*1Faculty of Environmental and Urban Engineering, Kansai University
3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan
*2Yokohama Institute for Earth Sciences, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Kanagawa, Japan
*3Department of Civil and Environmental Engineering, National Defense Academy (NDA), Kanagawa, Japan
*4Faculty of Science and Engineering, Chuo University, Tokyo, Japan
*5Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima, Japan
*6Earthquake and Tsunami Research Division, National Research Institute for Earth Science and Disaster Resilience (NIED), Ibaraki, Japan
*7Meteorological Research Institute, Japan Meteorological Agency (JMA), Ibaraki, Japan
*8R&D Center, Nippon Koei Co., Ltd., Ibaraki, Japan
*9International Research Institute of Disaster Science (IRIDeS), Tohoku University, Miyagi, Japan
*10IDEA Consultants, Inc., Kanagawa, Japan
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.
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