Destruction patterns and mechanisms of coastal levees on the Sendai Bay Coast hit by the 2011 tsunami

Tatsuki Iida, Akira Mano, Keiko Udo, Hitoshi Tanaka

研究成果: Chapter

2 被引用数 (Scopus)

抄録

A mega tsunami hit the Sendai Bay Coast on March 11, 2011, overtopped coastal levees and intruded into far inland while sweeping houses, people and others away. Eighty percent of the levees, which rimmed the coast to protect the land from storm surges together with the wind waves were broken in various degrees of damage by the tsunami. The national and local governments decided to rebuild the levees to be durable even for mega tsunamis. This requirement motivates us to find the destruction mechanism of the coastal levees. We conducted field investigations and collected the tsunami records, aerial photos and tsunami videos. Especially, the video taken from the helicopter “Michinokugo” which flew along the Sendai Coast to the south during the attack of the tsunami’s leading wave enables us to see the breaking process. Integrated analysis leads to two step mechanisms of the destruction: the first step of breaking the upper structure of the levees by the surging bore of the leading wave and the second step of expanding erosion by the return flow concentration.

本文言語English
ホスト出版物のタイトルAdvances in Natural and Technological Hazards Research
出版社Springer Netherlands
ページ309-320
ページ数12
DOI
出版ステータスPublished - 2014

出版物シリーズ

名前Advances in Natural and Technological Hazards Research
35
ISSN(印刷版)1878-9897
ISSN(電子版)2213-6959

ASJC Scopus subject areas

  • 地球変動および惑星変動
  • 地理、計画および開発
  • 経済地質学
  • 地球科学におけるコンピュータ
  • 管理、モニタリング、政策と法律

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