Coastal morphology change before and after 2011 off the pacific coast of Tohoku Earthquake Tsunami at Rikuzen-Takata Coast

Keiko Udo, Yuriko Takeda, Hitoshi Tanaka

研究成果: Review article査読

10 被引用数 (Scopus)

抄録

This study investigates the changes in coastal topography of the Rikuzen-Takata Coast in Iwate Prefecture, Japan before and after the 2011 off the Pacific coast of Tohoku Earthquake Tsunami and the effects of coastal structures on these changes. The changes in coastal topography were analyzed using bathymetry data and aerial photographs before and after the tsunami in addition to aerial video during the tsunami. The bathymetry data were obtained from 1989 to 2002 during the construction of three submerged breakwaters and from after the 2011 tsunami until 2013. The aerial photographs were acquired from 1947 to 2015, and the aerial videos were acquired during the tsunami run-up and backwash. The results demonstrated that the coast was eroded mainly due to the tsunami backwash, and the submerged breakwaters trapped the seaward transport of sediment from the coast. Erosion was partly prevented in locations where the seawall was not washed away. The coastal structures had significant effects on the behavior of the coastal tsunami and on sediment transport. We also found that the coast did not recover naturally at the desired speed after the tsunami because the coast had been stable before the tsunami. Coastal restoration five years after the 2011 tsunami are also summarized in the Appendix to illustrate the future reconstruction plan for the study coast.

本文言語English
論文番号1640016
ジャーナルCoastal Engineering Journal
58
4
DOI
出版ステータスPublished - 2016 12 1

ASJC Scopus subject areas

  • 土木構造工学
  • モデリングとシミュレーション
  • 海洋工学

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