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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationProceedings of the Coastal Engineering Conference
PublisherAmerican Society of Civil Engineers (ASCE)
Volume2014-January
ISBN (Print)9780989661126
Publication statusPublished - 2014
Event34th International Conference on Coastal Engineering, ICCE 2014 - Seoul, Korea, Republic of
Duration: 2014 Jun 152014 Jun 20

Other

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

Keywords

  • Breaching
  • Drainage
  • The 2011 tsunami
  • Topographical features

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Ocean Engineering
  • Oceanography

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  • Cite this

    Tanaka, H., Adityawan, M. B., Udo, K., & Mano, A. (2014). Breaching and tsunami water drainage at old river mouth locations during the 2011 Tsunami. In Proceedings of the Coastal Engineering Conference (Vol. 2014-January). American Society of Civil Engineers (ASCE).