Geomorphic imprints of repeated tsunami waves in a coastal valley in northeastern Japan

Yuichi S. Hayakawa, Takashi Oguchi, Hitoshi Saito, Akitoshi Kobayashi, Victor Baker, Jon Pelletier, Luke A. McGuire, Goro Komatsu, Kazuhisa Goto

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Devastating tsunami waves induced by the 2011 off the Pacific coast of Tohoku Earthquake severely inundated valleys along the ria-type (notched rocky) coast in northeastern Japan, causing erosion of bedrock on valley-side slopes. Using high-resolution topographic data obtained by terrestrial and airborne laser scanning, we investigated detailed morphology of the eroded valley in a typical site at Aneyoshi. We found several characteristic features likely affected by tsunami wave erosion: 1) a series of small cliffs on the valley-side slopes related to the tsunami flow depth, 2) an inverse asymmetry of side slopes at ingrown meander bends, 3) an exceptionally wide valley bottom near the coast, and 4) a knickpoint located around the maximum tsunami run-up point far back from the coast. These topographic features are ascribable to repeated tsunami wave erosion since the mid-Holocene.

Original languageEnglish (US)
Pages (from-to)3-10
Number of pages8
JournalGeomorphology
Volume242
DOIs
StatePublished - Aug 1 2015

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tsunami
valley
coast
erosion
ria
meander
cliff
asymmetry
bedrock
laser
Holocene
earthquake

Keywords

  • Bedrock erosion
  • Cliff
  • Knickpoint
  • Meander
  • Terrestrial laser scanning
  • Tsunami

ASJC Scopus subject areas

  • Earth-Surface Processes

Cite this

Geomorphic imprints of repeated tsunami waves in a coastal valley in northeastern Japan. / Hayakawa, Yuichi S.; Oguchi, Takashi; Saito, Hitoshi; Kobayashi, Akitoshi; Baker, Victor; Pelletier, Jon; McGuire, Luke A.; Komatsu, Goro; Goto, Kazuhisa.

In: Geomorphology, Vol. 242, 01.08.2015, p. 3-10.

Research output: Contribution to journalArticle

Hayakawa, YS, Oguchi, T, Saito, H, Kobayashi, A, Baker, V, Pelletier, J, McGuire, LA, Komatsu, G & Goto, K 2015, 'Geomorphic imprints of repeated tsunami waves in a coastal valley in northeastern Japan', Geomorphology, vol. 242, pp. 3-10. https://doi.org/10.1016/j.geomorph.2015.02.034
Hayakawa, Yuichi S. ; Oguchi, Takashi ; Saito, Hitoshi ; Kobayashi, Akitoshi ; Baker, Victor ; Pelletier, Jon ; McGuire, Luke A. ; Komatsu, Goro ; Goto, Kazuhisa. / Geomorphic imprints of repeated tsunami waves in a coastal valley in northeastern Japan. In: Geomorphology. 2015 ; Vol. 242. pp. 3-10.
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