Abstract
When the inundation area for the Nankai Trough Earthquake Tsunami is simulated, the assumed tsunami size and initial tidal level are usually fixed. However, those conditions would not necessarily be the same with the real tsunami. Therefore, it is important to simulate under various conditions and find high-risk locations for tsunami inundation. In this study, two-dimensional analysis of tsunami propagation under combinatorial conditions with the tsunami size and the initial tidal level were simulated. The model contains a two-way nesting scheme and can calculate tsunami propagation from the source to Osaka Bay in high speed with good accuracy. As a result, it was found that when the initial tidal level was lower than the mean sea level, the total inundation area is small even when a very large tsunami size is assumed. Also, as expected, the tsunami size and total inundation area were found to have a strong correlation. From these results, it was possible to identify critical locations where inundation occurred even under mild conditions.
