Breaching and tsunami water drainage at old river mouth locations during the 2011 Tsunami

Hitoshi Tanaka, Mohammad Bagus Adityawan, Keiko Udo, Akira Mano

研究成果: Conference contribution

5 被引用数 (Scopus)

抄録

This study investigated the effect of the past drainage system and river mouth to the return flow of the 2011 Great East Japan Tsunami at the Arahama Coast and the Akaiko Coast, Sendai, Japan. At both locations, there were old river mouths, which have been closed for many years. They used to be the down stream end of the past drainage system that was confirmed from historical map. Breaching occurred at the location of these old river mouths due to the strong return flow induced by the 2011 tsunami. A detail GIS analysis was carried out based on topographic data (DEM) to obtain the flow direction and accumulation. The results revealed that the topography appears as a river basin with mild slope towards the old river mouth locations. Analysis of the flow accumulation confirms that the topographical features caused the flow to accumulate through the past drainage system towards the location of the old river mouths, which caused the breaching due to the tsunami return flow. This allowed the return flow to be effectively drained.

本文言語English
ホスト出版物のタイトルProceedings of the Coastal Engineering Conference
出版社American Society of Civil Engineers (ASCE)
2014-January
ISBN(印刷版)9780989661126
出版ステータスPublished - 2014
イベント34th International Conference on Coastal Engineering, ICCE 2014 - Seoul, Korea, Republic of
継続期間: 2014 6月 152014 6月 20

Other

Other34th International Conference on Coastal Engineering, ICCE 2014
国/地域Korea, Republic of
CitySeoul
Period14/6/1514/6/20

ASJC Scopus subject areas

  • 土木構造工学
  • 海洋工学
  • 海洋学

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