Trace Survey of the 2011 Tohoku Tsunami in the North of Miyagi Prefecture and Numerical Simulation of Bidirectional Tsunamis in Utatsusaki Peninsula

When a tsunami reaches the coast and penetrates inland, its characteristics change significantly from water wave to strong inundation flow which causes damage on infrastructures, buildings and humans. Measuring flow velocities of tsunami inundation on land is quite rare but is important for understanding how tsunami penetrates inland and improving tsunami numerical models. In order to clarify the tsunami inundation flow characteristics on land with particular regard to velocity, we analyzed the aerial videos which captured the 2011 Tohoku tsunami attacking Sendai coast, Miyagi Prefecture. Consequently, the tsunami front and flow velocities reached approximately 8 m/s within 1 km inland from the shoreline, and they decreased as penetrating more inland. The results were used for verification of the numerical tsunami inundation model that is performed in Sendai city. We found that the present model results are consistent with the observed inundation characteristics when the bottom roughness distribution is sufficiently incorporated according to the land use conditions. This implies the capability of the present tsunami inundation model which is now used for the evaluation of post-disaster reconstruction plan of Sendai city.

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Numerical Simulation of Soliton Fission in 2011 Tohoku Tsunami using Nonlinear Dispersive Wave Model

Journal of Japan Society of Civil Engineers Ser B2 (Coastal Engineering) ◽

10.2208/kaigan.68.i_206 ◽

2012 ◽

Vol 68 (2) ◽

pp. I_206-I_210 ◽

Cited By ~ 1

Author(s):

Yoichi MURASHIMA ◽

Shunichi KOSHIMURA ◽

Hideyuki OKA ◽

Yasuhiro MURATA ◽

Koji FUJIMA ◽

...

Keyword(s):

Numerical Simulation ◽

Wave Model ◽

Dispersive Wave ◽

2011 Tohoku Tsunami ◽

Tohoku Tsunami ◽

Soliton Fission ◽

Nonlinear Dispersive Wave

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Numerical Simulation of the 2011 Tohoku Tsunami Based on a New Transient FEM Co-seismic Source: Comparison to Far- and Near-Field Observations

Pure and Applied Geophysics ◽

10.1007/s00024-012-0528-y ◽

2012 ◽

Vol 170 (6-8) ◽

pp. 1333-1359 ◽

Cited By ~ 95

Author(s):

Stephan T. Grilli ◽

Jeffrey C. Harris ◽

Tayebeh S. Tajalli Bakhsh ◽

Timothy L. Masterlark ◽

Christodoulos Kyriakopoulos ◽

...

Keyword(s):

Numerical Simulation ◽

Near Field ◽

Seismic Source ◽

Field Observations ◽

2011 Tohoku Tsunami ◽

Tohoku Tsunami

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FORMATION OF BREAKING BORES IN FUKUSHIMA PREFECTURE DUE TO THE 2011 TOHOKU TSUNAMI

Coastal Engineering Proceedings ◽

10.9753/icce.v35.currents.17 ◽

2017 ◽

pp. 17

Author(s):

Shinji Sato ◽

Shohei Ohkuma

Keyword(s):

Numerical Simulation ◽

Laboratory Experiments ◽

Coastal Structures ◽

Tsunami Simulation ◽

Fukushima Prefecture ◽

2011 Tohoku Tsunami ◽

Coastal Cliff ◽

Bed Slope ◽

Tohoku Tsunami ◽

Impulsive Pressure

Tsunami forces on critical coastal structures were reanalyzed by combining laboratory experiments and numerical tsunami simulation, focusing on the formation of breaking bores and their large force to structures. Laboratory experiments demonstrated that nearshore tsunami is likely to form a breaking bore when the slope of the incident tsunami front is steep and the nearshore bed slope is mild. The impulsive pressure to coastal structures was found to increase with the steepness of the tsunami front. Based on these results, together with numerical simulation of tsunami, the formation of bores was discussed in relation to coastal cliff topography in Fukushima Prefecture.

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