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 () and Kazuhiko Ban

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2006, vol. 39, issue 2, 159-177

Abstract: 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 m 2 /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. Copyright Springer Science+Business Media B.V. 2006

Keywords: Tsunami; Landslide; Hydraulic experiment; Wave frequency dispersion; Shear stress term (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1007/s11069-006-0021-y

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