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.
Based on documents investigation, we examined a disaster scenario of power plant which hit by tsunami. In addition, we paid our attention to drifting ships due to tsunami and examined an evacuation method of a ship as a part of examination of countermeasures against tsunami disaster for a model harbor. The disaster scenario and a evacuation flow of a ship which we showed by this report become a help of examination of countermeasures against tsunami disaster.
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