Morphological changes along the ishinomaki coast induced by the 2011 great east Japan tsunami and the relationship with coastal structures

Mohammad Bagus Adityawan, Nguyen Xuan Dao, Hitoshi Tanaka, Akira Mano, Keiko Udo

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The 2011 Great East Japan Earthquake and Tsunami caused severe damage along the affected coastal area. This study analyzed seabed subsidence and morphological changes along the Ishinomaki Coast based on bathymetry measured shortly before and after the 2011 event. In general, seabed subsidence ranged from 0.32m to 0.91m. In addition, massive erosion on the seabed due to the 2011 tsunami occurred locally, in front of the Naruse River mouth and at the west end of the Ishinomaki Coast. Moreover, the depth of closure generated by the tsunami in these areas was higher than in others. The sandspit in front of the river mouth was severely eroded and the riprap protection at the west end was completely destroyed. Thus, there were no buffers in these areas during the tsunami. Therefore, tsunami-induced bed stresses were higher and may have occurred in deeper areas. Other areas, which were protected by relatively unharmed concrete structures, did not suffer from severe erosions. This suggests that the coastal protection structures protected both the land and the seaward side during the tsunami.

Original languageEnglish
Article number1450016
JournalCoastal Engineering Journal
Volume56
Issue number3
DOIs
Publication statusPublished - 2014 Sep 25

Keywords

  • The Great East Japan Tsunami of 2011
  • bathymetric changes
  • coastal morphological changes
  • coastal structures
  • seabed subsidence

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Modelling and Simulation
  • Ocean Engineering

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