Study on the relation of river morphology and tsunami propagation in rivers

Hitoshi Tanaka, Kosuke Kayane, Mohammad Bagus Adityawan, Min Roh, Mohammad Farid

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The relations of rivermorphology and tsunami propagation in rivers were studied at several rivers in the Tohoku region during The Great Chilean Tsunami of 2010 and The Great East Japan Tsunami of 2011. It was found that river mouth morphological features play an important role in the intrusion of low magnitude tsunamis in which the geological and geographical conditions are an important factor. Nevertheless, the effects of these featureswere not found in the case of an extreme tsunami wave. As the wave enters the river, the propagation depends on other factors. It was found that the intrusion distance correlates well to the riverbed slope. The measurements of water level and riverbed slope were analyzed to propose an empirical method for estimating the damping coefficient for the tsunami propagation in rivers based on the tsunami of 2011. The proposed empirical method was used to approximate the length of the tsunami intrusion into a river by assuming that the furthest distance is given for the ratio of local tsunami wave height to the tsunami wave height at the river entrance of 0.05 (5 %). The estimated intrusion length from the proposed method in this study shows a good comparison with measurement data.

Original languageEnglish
Pages (from-to)1319-1322
Number of pages4
JournalOcean Dynamics
Volume64
Issue number9
DOIs
Publication statusPublished - 2014 Sep

Keywords

  • Bed slope
  • Propagation
  • Rivermorphology
  • Tsunami

ASJC Scopus subject areas

  • Oceanography

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