10:45 AM - 11:00 AM
[HDS13-13] Investigation of variation in multiple tsunami inundation modelling
Keywords:tsunami, numerical model, variation
The present study aims to evaluate magnitude of the variation in tsunami inundation simulation quantitatively. We conducted tsunami simulations under the same input data: the initial source model of tsunami, bathymetry, topography and land-use model provided by Cabinet Office, Government of Japan are adopted. A total of eight research institutes participated this project using four kinds of numerical models that are widely employed for the tsunami hazard/risk assessment. Comparison of the time history of water surface elevation and flow velocity at the specific points indicated that a significant difference was confirmed among the model results to the maximum value of physical quantities. The spatial distribution maps of the maximum inundation depth also showed that large variation occurs around the front of tsunami run-up. In order to explain the variation in tsunami inundation model quantitatively, the total flooded volume and the total momentum flux were newly defined. By statistical procedures using these variables, we were able to show the mean value, confidence interval and coefficient of variation of the tsunami inundation models.