Dispersive tsunami wave modeling by parallel computation with variable nested-grids in spherical coordinates
Abstract
Due to development of offshore tsunami observation technologies, frequency dispersion on tsunami propagation has been often observed in the recent tsunamis such as the 2004 Indian Ocean and 2011 Tohoku tsunamis. The dispersive propagation of tsunamis can be simulated with the Boussinesq model, but which demands a lot of computation resources. On the other hand, rapid progress is being made in parallel computing technology. In this study, we investigated a parallelized approach using OpenMP and MPI for dispersive tsunami wave modeling. Our new parallel code solves either the linear or nonlinear Boussinesq-type dispersive water equations in spherical coordinates. A variable nested-grid scheme was employed to increase spatial resolution in the target region. Tsunami inundation on land can be also predicted with the code. This new code was named 'JAGURS'. JAGURS stands for that the 'JA'MSTEC improved the former code developed by 'G'eoscience Australia and 'UR'S Corporation (Jakeman et al., 2011) which uses 'S'atake (2002)'s kernel. By applying JAGURS, the dispersive tsunami modeling was implemented for the 2011 Tohoku earthquake. The finest topographic grid interval was 0.22 arc-second (about 5m) along the longitude and latitude directions in coastal area. A good agreement was shown between the dispersive wave modeling and the tsunami waveforms observed in offshore. The dispersive model predicted the similar inundation area with that derived from the non-dispersive model.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2013
- Bibcode:
- 2013AGUFMNH43A1725B
- Keywords:
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- 4303 NATURAL HAZARDS Hydrological;
- 4339 NATURAL HAZARDS Disaster mitigation;
- 7240 SEISMOLOGY Subduction zones