SIMULATION OF TSUNAMI ACCOMPANIED BY BREAKING SHORT-PERIOD WAVES

Takashi Tomita, Kenya Takahashi

Abstract


The 2011 Tohoku tsunami hitting Kuji port, Japan, was high whose height of 5.4 m was measured in the water area of 49.5 m deep in front of the open mouth of the port. This tsunami was accompanied by short-period waves while it propagated in the port, and then it broke in the port of 18 m deep approximately ahead on a breakwater. Since wave pressure by a tsunami with short-period waves is important for design of breakwaters according to Ikeno et al. (2006), such wave transformation and deformation should be able to be calculated for planning and designing measures to save people and reduce property loss. In this study, a non-hydrostatic mathematical model was developed to calculate tsunamis including short period waves, and validated in comparison with experimental results in which the tsunami in Kuji port was modeled.

Keywords


Tsunami; undular bore; numerical simulation; wave breaking model; non-hydrostatic model

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References


Fujima, K., K. Masamura, and C. Goto. 2002. Development of the 2d/3d hybrid model for tsunami numerical simulation. Coastal Engineering Journal, 44(4), 373-397.

Honda, K., and T. Tomita. 2009. Tsunami inundation simulation by three-dimensional model. Proceedings of 31st International Conference on Coastal Engineering, ASCE, 1433-1445.

Ikeno, M., M Matsuyama, T. Sakakiyama, and K. Yanagisawa. 2006. Estimation of tsunami force with breaking of split waves based on model tests, Report of Central Research Institute of Electric Power Industry, V05009. (in Japanese)

Kashima, H., and K. Hirayama. 2013. Model experiments and numerical simulations on tsunami with soliton fission in Kuji harbor, Journal of JSCE, Ser. B3 (Ocean Engineering), 69 (2), I_694-I_699.

Kennedy, A.B., Q. Chen, J.T. Kirby, and R.A. Dalrymple. 2000. Boussinesq modeling of wave transformation, breaking, and runup. I: 1D, Journal of Waterway, Port, Coastal, and Ocean Engineering, 126(1), 39-47.

Lynett, P.J. 2006. Nearshore wave modeling with high-order Boussinesq-type equations, Journal of Waterway, Port, Coastal, and Ocean Engineering, 132(5), 348-357.

Madsen, P.A., and O.R. Sørensen. 1883. A new form of the Boussinesq equations with improves linear dispersion characteristics, Part 2, A slow-varying bathymetry, Coastal Engineering, 18, 183-204.

Nwogu, O. 1993. An alternative form of the Boussinesq equations for nearshore wave propagation, Journal of Waterway, Port, Coastal and Ocean Engineering, 119(6), 618-638.

PIANC (World Association for Waterborne Transport Infrastructure). 2010. Mitigation of tsunami disasters in ports, Report number 112, 56-61.

Sakakiyama, T., and R. Kajima. 1992. Numerical simulation of nonlinear wave interacting with permeable breakwaters, Proceedings of 23rd International Conference on Coastal Engineering, ASCE, 1517-1530.

Shuto, N. 2007. Tsunami caused by the Japan Sea earthquake of 1983, Disasters, 7(4), 255-258.

Tomita, T., K. Honda, and T. Kakinuma. 2007. Application of three-dimensional tsunami simulator to estimation of tsunami behavior around structures. Proceedings of 30th International Conference on Coastal Engineering, ASCE, 1677-1688.




DOI: https://doi.org/10.9753/icce.v34.currents.2