Tsunami Bores in Kitakami River

Elena Tolkova, Hitoshi Tanaka

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The 2011 Tohoku tsunami entered the Kitakami river and propagated there as a train of shock waves, recorded with a 1-min interval at water level stations at Fukuchi, Iino, and the weir 17.2 km from the mouth, where the bulk of the wave was reflected back. The records showed that each bore kept its shape and identity as it traveled a 10.9-km-path Fukuchi–Iino–weir–Iino. Shock handling based on the cross-river integrated classical shock conditions was applied to reconstruct the flow velocity time histories at the measurement sites, to estimate inflow into the river at each site, to evaluate the wave heights of incident and reflected tsunami bores near the weir, and to estimate propagation speed of the individual bores. Theoretical predictions are verified against the measurements. We discuss experiences of exercising the shock conditions with actual tsunami measurements in the Kitakami river, and test applicability of the shallow-water approximation for describing tsunami bores with heights ranging from 0.3 to 4 m in a river segment with a depth of 3–4 m.

Original languageEnglish
Pages (from-to)4039-4054
Number of pages16
JournalPure and Applied Geophysics
Volume173
Issue number12
DOIs
Publication statusPublished - 2016 Dec 1

Keywords

  • Kitakami River
  • Tohoku tsunami 2011
  • bore
  • shock conditions
  • shock wave
  • undular bore

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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