Morphology recovery of the Abukuma River mouth after the 2011 Tohoku tsunami under the interaction between sand spit and sand terrace

Nguyen Trong Hiep, Hitoshi Tanaka, Nguyen Xuan Tinh

Research output: Contribution to journalArticlepeer-review

Abstract

The 2011 Great East Japan Earthquake and Tsunami are one of the most catastrophic natural disasters that took place in Japan. The disaster caused widespread destruction to the estuarine and coastal areas along the northeastern region of Japan. The Abukuma River mouth, among many estuaries in Miyagi Prefecture, suffered major damage from the tsunami in which the sand spit and the sand terrace were severely eroded. The present study aims to provide a better comprehension of the morphology of the Abukuma River mouth within a decade after the 2011 tsunami based on the collected datasets of imagery and offshore bathymetry surveys. The consecutive changes of the sand terrace and sand spit indicate their connection influencing the morphological recovery in the Abukuma River mouth. About a year after the tsunami, the sand terrace re-appeared by a flood event and became the sediment source to recover the sand spit under the intrusion process. When the sand spit almost recovered and achieved a stable configuration, the sediment from the sand terrace into the river was restricted. As a result, more sediment from the sand terrace was expected to be transported to the downdrift area under the dominant wave condition in the Abukuma River mouth.

Original languageEnglish
JournalCoastal Engineering Journal
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • intrusion
  • recovery process
  • sand spit
  • sand terrace
  • The 2011 tsunami

ASJC Scopus subject areas

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

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