Detached breakwaters effects on tsunamis around coastal dykes

Takahito Mikami*, Mizuho Kinoshita, Shunya Matsuba, Shun Watanabe, Tomoya Shibayama

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)


The Japanese coastal areas have a lot of different types of coastal structures with different purposes, and it is important to understand each structure's effects on tsunami. In the present paper, the authors focused on detached breakwaters effects on tsunami flow around coastal dykes with a field data investigation and laboratory experiments using a tsunami basin. The field data obtained from the 2011 Tohoku Earthquake and Tsunami showed that tsunami flow was not uniform along a coastal dyke with the specific arrangement of detached breakwaters. The laboratory experiments performed in a tsunami basin showed that a detached breakwater with a small detached breakwater parameter (distance from the shoreline/length of the opening) had a tsunami mitigation effect along the shoreline just behind the main body of the breakwater, but did not have a tsunami mitigation effect along the shoreline just behind the opening. The results obtained from the laboratory experiments agreed with the field data of the 2011 tsunami.

Original languageEnglish
Pages (from-to)422-427
Number of pages6
JournalProcedia Engineering
Issue number1
Publication statusPublished - 2015
Event5th International Conference on Asian and Pacific Coasts, APAC 2009 - Singapore, Singapore
Duration: 2009 Oct 132009 Oct 16


  • Coastal dyke
  • Detached breakwater
  • Laboratory experiment
  • Tsunami

ASJC Scopus subject areas

  • Engineering(all)


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