Simulated effectiveness of coastal forests on reduction in loss of lives from a tsunami

Tomoyuki Takabatake*, Miguel Esteban, Tomoya Shibayama

*この研究の対応する著者

研究成果: Article査読

抄録

Although a substantial body of research has investigated the impacts of coastal vegetation on tsunami propagation over land, the effectiveness of coastal forests in reducing the number of expected casualties behind them has rarely been evaluated. Thus, this study investigates the effectiveness of coastal forests in reducing tsunami-related casualties using an agent-based evacuation simulation model. A tsunami propagation and inundation simulation model that considers vegetation-induced resistance to the flow was first developed and used to simulate the inundation observed at Shobutahama Beach in Miyagi Prefecture, Japan, during the 2011 Tohoku Tsunami. The results confirmed that the model is able to simulate the effects of coastal forests with relatively good accuracy. Then, this agent-based tsunami evacuation model was used to simulate evacuation that considers the implementation of coastal forests and other countermeasures (e.g., coastal dykes and evacuation signs) to reduce casualty rates. When coastal forests alone were considered the simulated casualty rates were reduced by a maximum of around 54% (compared with the case when no countermeasures were contemplated). However, a more significant reduction in casualty rates (a maximum of around 97%) was achieved when a coastal dyke capable of withstanding tsunami overflow was constructed. Furthermore, considering a combination of coastal forests and the construction of a dyke was shown to be more effective than either countermeasure alone, indicating the importance of implementing combined strategies to minimize the number of casualties due to a major tsunami event.

本文言語English
論文番号102954
ジャーナルInternational Journal of Disaster Risk Reduction
74
DOI
出版ステータスPublished - 2022 5月

ASJC Scopus subject areas

  • 地盤工学および土木地質学
  • 安全研究
  • 地質学

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