[HDS13-P13] Sediment Transport Modeling due to Tsunamis caused by the Nankai great earthquakes
Keywords:Nankai Trough Earthquake, Sediment Transport software
The first study area is Tachibana-Bay classified as an important port having the rias coast in Shikoku, the southwestern Japan. In the simulation results, erosions were predicted in the straits between the islands, at the tip of the cape, near the estuary of the river and near the coastal levees. Sediment depositions were predicted in the vicinity. The maximum changes in erosion and sediment were about 10 m, about 6 m, respectively, for the great Nankai earthquakes (Mw 9.1). These were about 6 m and about 2 m, respectively, for the 1707 Hoei earthquake.
The other study area is a pond near the Cape Kamoda where tsunami sediment was found in the sediment layer about 2000 years ago (Okamura et al, 2012). However, all simulations we conducted in this study did not deposit sediment into the pond.
Acknowledgments: We thank Dr. Takahashi for providing us with the sediment transport software. This research is supported by Grant-in-Aid for Scientific Research 15H05718.