Hydraulic and numerical study on the generation of a subaqueous landslide-induced tsunami along the coast

Yoshinori Shigihara, Daichi Goto, Fumihiko Imamura, Yuichi Kitamura, Takayuki Matsubara, Kazuaki Takaoka, Kazuhiko Ban

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


By carrying out the hydraulic experiments in a one-dimensional open channel and two-dimensional basin, we clarified the process of how a landslide on a uniform slope causes the generation of a tsunami. The effect of the interactive force that occurs between the debris flow layer and the tsunami is significant in the generation of a tsunami. The continuous flow of the debris into the water makes the wave period of the tsunami short. The present experiments apply numerical simulation using the two-layer model with shear stress models on the bottom and interface, and the results are compared. The simulated debris flow shows good agreement with the measured results and ensures the rushing process into the water. We propose that the model use a Manning coefficient of 0.01 for the smooth slope and 0.015 for the rough slope, and a horizontal viscosity of 0.01 m2/s for the landslide; an interactive force of 0.2 for each layer is recommended. The dispersion effect should be included in the numerical model for the propagation from the shore.

Original languageEnglish
Pages (from-to)159-177
Number of pages19
JournalHandbook of Environmental Chemistry, Volume 5: Water Pollution
Issue number2
Publication statusPublished - 2006 Oct


  • Hydraulic experiment
  • Landslide
  • Shear stress term
  • Tsunami
  • Wave frequency dispersion

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Atmospheric Science
  • Water Science and Technology


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