Hydraulic and numerical study on the generation of a subaqueous landslide-induced tsunami along the coast |
| |
Authors: | Yoshinori Shigihara Daichi Goto Fumihiko Imamura Yuichi Kitamura Takayuki Matsubara Kazuaki Takaoka Kazuhiko Ban |
| |
Affiliation: | (1) Disaster Control Research Center, Graduate School of Engineering, Tohoku University, Aoba06, Sendai 980-8579, Japan;(2) Japan Power Energy Corp., Higashi-Ginza6-15-1, Tokyo, Japan |
| |
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 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. |
| |
Keywords: | Tsunami Landslide Hydraulic experiment Wave frequency dispersion Shear stress term |
本文献已被 SpringerLink 等数据库收录! |
|