Longshore propagation erosion of beach in the vicinity of tsunami-induced concave shoreline

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The 2011 Great East Japan Earthquake and Tsunami caused significant changes in the morphology of the Sendai Coast, Miyagi Prefecture, Japan. These tsunami waves and the return flows resulted in the formation of concave shorelines in areas like lagoon locations adjacent to river mouths or where sandy beaches located on pre-existent (closed) river mouths were breached. This study investigates the erosion of sandy beaches adjacent to the concave shoreline at the Nanakita River mouth and the Akaiko breaching areas after the tsunami through an analysis of aerial photographs and analytical solutions of the one-line model. Soon after the tsunami, sandy beaches on both sides of the concave shoreline experienced erosion that was propagating along the coast. Analysis of the analytical solution of the one-line model indicates that the erosion propagation distance is proportional to square root of elapsed time. Measured data of erosion propagation distance from aerial photograph is found to match well with theoretical results. An approach to estimate diffusion coefficient, which is an important parameter in numerical simulation of shoreline change, is introduced.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalJournal of Hydro-Environment Research
Publication statusPublished - 2019 Mar


  • Analytical solution
  • Concave shoreline
  • Diffusion coefficient
  • Erosion propagation
  • Morphological change
  • One-line model
  • River mouth
  • Tsunami


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