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Open AccessArticle

Development of a Tsunami Inundation Analysis Model for Urban Areas Using a Porous Body Model

1
International Research Institute of Disaster Science, Tohoku University, Sendai 980-0845, Japan
2
Fujitsu Laboratories Ltd., Kawasaki 211-8588, Japan
*
Author to whom correspondence should be addressed.
Geosciences 2018, 8(1), 12; https://doi.org/10.3390/geosciences8010012
Received: 27 October 2017 / Revised: 18 December 2017 / Accepted: 25 December 2017 / Published: 4 January 2018
(This article belongs to the Special Issue Interdisciplinary Geosciences Perspectives of Tsunami)
To evaluate tsunami hazards with strong locality in urban areas, this study developed a novel tsunami inundation model based on nonlinear shallow water wave equations and a porous body model (PBM). By applying a kinematic boundary condition that includes both porosity and surface permeability of the porous medium, the proposed model could accurately incorporate geometric effects such as the flow anisotropy caused by the distributions of buildings. The proposed PBM demonstrated as good accuracy for the inundation heights around buildings near the coastline as with a conventional three-dimensional simulation with high resolution. In addition, the model showed its capability to reproduce a tsunami’s essential behaviors in urban areas. In particular, the amplification effect of flow velocity along straight roads surrounded by buildings was reasonably reproduced. It can be expected that the present model can become a useful tool to accurately evaluate the tsunami risks in urban areas. View Full-Text
Keywords: tsunami inundation analysis; porous body model; urban-type tsunami; urban area; Onagawa town; Great East Japan Earthquake tsunami inundation analysis; porous body model; urban-type tsunami; urban area; Onagawa town; Great East Japan Earthquake
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Yamashita, K.; Suppasri, A.; Oishi, Y.; Imamura, F. Development of a Tsunami Inundation Analysis Model for Urban Areas Using a Porous Body Model. Geosciences 2018, 8, 12.

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