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Characteristics of Shoreline Retreat Due to the 2011 Tohoku Earthquake and Tsunami and Its Recovery After Three Years

  • Keiko UdoEmail author
  • Kaoru Tojo
  • Yuriko Takeda
  • Hitoshi Tanaka
  • Akira Mano
Chapter
Part of the Coastal Research Library book series (COASTALRL, volume 14)

Abstract

We investigate the characteristics of shoreline retreat due to the 2011 Tohoku Earthquake and Tsunami and its recovery after 3 years over a wide area from Aomori Prefecture to Ibaraki Prefecture by analyzing the data of crustal deformation, tsunami height, and aerial photographs. There were no significant retreats where the seawall remained unbreached and where river mouths were distantly located regardless of the tsunami overflow depth over the seawall, indicating that the seawall condition during tsunami strikes is one of the most important factors that prevent serious shoreline retreat. After 3 years from the event, recovery of the eroded Ria coasts has been insignificant compared to the plain coasts. The key natural factors for the recovery are the upward crustal deformation after the earthquake and sediment supply from adjacent coasts or rivers after the tsunami; however, these could not be expected at the Ria coasts at least in near future.

Keywords

Coastal land loss Sediment transport Coastal structure Satellite image Beach erosion 

Notes

Acknowledgments

This research was supported by the Special Project Research of IRIDeS (International Research Institute of Disaster Science, Tohoku University) and JSPS KAKENHI Grant Number 26289158.

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Keiko Udo
    • 1
    Email author
  • Kaoru Tojo
    • 2
  • Yuriko Takeda
    • 1
  • Hitoshi Tanaka
    • 2
  • Akira Mano
    • 1
  1. 1.International Research Institute of Disaster ScienceTohoku UniversitySendaiJapan
  2. 2.Department of Civil and Environmental EngineeringTohoku UniversitySendaiJapan

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