Impact of the 2011 tsunami on the littoral system around offshore breakwaters on Sendai Coast

H. Tanaka, Y. Mitobe, A. Mori

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

Abstract

After the 2011 Great East Japan Earthquake Tsunami, littoral system on Sendai Coast have been changing due to tsunami-induced highly non-equilibrium condition along the coast. In order to clarify the modification of littoral environment and its subsequent recovery on Sendai Coast, analysis of shoreline change has been carried out. In this study, the shoreline was extracted from frequently captured aerial photographs from 2009 until now, and analysis using an empirical orthogonal function (EOF) method was conducted. It is seen that the shoreline retreated greatly due to tsunami event. In particular, tombolo which existed behind the offshore breakwater completely disappeared due to the tsunami. Total of contribution of the 1st and 2nd EOF components is more than 70%. It is concluded that the 1st component originated from cross-shore sediment movement, while the 2nd component represents longshore sediment transport. Although the 1st component shows only slight modification after the tsunami, the 2nd component resulting from a longshore sediment transport shows distinct change after the tsunami around the offshore breakwaters.

Original languageEnglish
Title of host publicationScour and Erosion - Proceedings of the 8th International Conference on Scour and Erosion, ICSE 2016
EditorsJohn Harris, Richard Whitehouse, Sarah Moxon
PublisherCRC Press/Balkema
Pages349-353
Number of pages5
ISBN (Print)9781138029798
DOIs
Publication statusPublished - 2016
Event8th International Conference on Scour and Erosion, ICSE 2016 - Oxford, United Kingdom
Duration: 2016 Sep 122016 Sep 15

Publication series

NameScour and Erosion - Proceedings of the 8th International Conference on Scour and Erosion, ICSE 2016

Other

Other8th International Conference on Scour and Erosion, ICSE 2016
CountryUnited Kingdom
CityOxford
Period16/9/1216/9/15

ASJC Scopus subject areas

  • Water Science and Technology
  • Ocean Engineering
  • Environmental Engineering

Fingerprint Dive into the research topics of 'Impact of the 2011 tsunami on the littoral system around offshore breakwaters on Sendai Coast'. Together they form a unique fingerprint.

Cite this