Development of a tsunami inundation analysis model for urban areas using a porous body model

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Abstract

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.

Original languageEnglish
Article number12
JournalGeosciences (Switzerland)
Volume8
Issue number1
DOIs
Publication statusPublished - 2018 Jan 4

Keywords

  • Great east Japan earthquake
  • Onagawa town
  • Porous body model
  • Tsunami inundation analysis
  • Urban area
  • Urban-type tsunami

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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