11:45 AM - 12:00 PM
★ [MIS25-11] Hydraulic experiment and numerical modeling on tsunami deposit aiming tsunami source estimation
Keywords:tsunami run-up, sediment transport, bed load, suspended load, topography change, inverse analysis
The present numerical model can cover tsunami source, propagation and sediment transport in the sea. The model can predict bathymetry changes due to tsunamis in coastal areas if fault models of earthquakes are given. A small fishing port, for example, has complicated coastal structures like breakwaters, and generates numerical instability easily. However, the practical and detailed simulation on tsunami sediment transport using a two meters grid was conducted stably. Therefore, if the numerical model is upgraded to simulate the sediment transport and the tsunami deposit by tsunami run-up, the model is expected to enable to analyze tsunami sources using the tsunami deposit distribution on land, lakes and marshes.
Based on the background described above, the hydraulic experiments and the numerical modeling on sediment transport under the inundated condition are explained firstly. Besides, the hydraulic experiments on land aiming to extend the numerical model to tsunami run-up are introduced. From simulation on the tsunami sediment transport in actual sea areas, present state and issues of the numerical model are organized. Finally, a method to estimate tsunami sources using tsunami deposit distribution is investigated.