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Kim D.C.,Hyein E and C Co. | Kim K.O.,Korea Advanced Institute of Science and Technology | Choi B.H.,Sungkyunkwan University | Kim K.H.,Sungkyunkwan University | And 2 more authors.
Journal of Coastal Research | Year: 2013

A post-tsunami runup survey for the 2004 Sumatra-Andaman earthquake showed that the highest runup which was recorded at Lhok Nga (West Banda Aceh, Sumatra). A reported maximum tsunami height of 35 m and maximum runup height of up to 51 m occurred near the Lhok Nga Twin Peaks (Labuhan and Ritieng). A numerical simulation was performed to reproduce tsunami characteristics in this area. The tsunami source was computed using fault parameters proposed by Tanioka et al. Tsunami wave propagation from the source to the coast was studied with 3D shallow-water equations. The coastal runup behavior of the tsunami at the Lhok Nga Twin Peaks was studied within a framework of fully nonlinear dispersive Reynolds-averaged Navier-Stokes equations using the FLOW3D code. This approach made it possible to reproduce the extreme characteristics of the tsunami in this coastal area, including observed overflow through a saddleback between the twin peaks. The numerical simulation results compare well with data from field surveys. © Coastal Education & Research Foundation 2013.

Kim D.C.,Hyein E and C Co. | Kim K.O.,Korea Advanced Institute of Science and Technology | Pelinovsky E.,Nizhny Novgorod State Technical University | Didenkulova I.,Tallinn University of Technology | Choi B.H.,Sungkyunkwan University
Journal of Coastal Research | Year: 2013

The huge tsunami generated by the earthquake that occurred off the Pacific coast of Japan at 14:46 JST (05:46 UTC) on Friday, 11 March 2011 produced a maximum runup of 40 m on the east coast of Japan. The earthquake triggered extremely destructive tsunami waves up to 37.9 m in height that struck Japan minutes after the quake. Koborinai is a tiny fishery port located north of Miyako City in the Iwate Prefecture. A survey team from the University of Tokyo Earthquake Research Institute (ERI) found high water marks and other evidence of a gigantic wave at the port of Koborinai. The port is on low land sandwiched between two mountains. A joint survey team from ERI-Sungkyunkwan University (SKKU) and Korea Ocean Research & Development Institute (KORDI) visited again and surveyed the site in detail. The 3D Princeton Ocean Model was applied to describe the propagation and runup of the tsunami on the Japanese coast. The numerical simulation results obtained were in satisfactory agreement with observations made in the general area, except those made in many v-shaped valleys along the northern Iwate coast. The extremely high runup of tsunami waves at the port at Koborinai were successfully reproduced by numerical simulation through stepwise refinement of the spatial scale using multi-nesting and consideration of the vertical acceleration of flow along steep slopes using a CFD model to solve the Reynolds-averaged Navier-Stokes (RANS) equations. The velocity field was also computed, and the simulation results show that the water flow that climbed the coast possessed a strong vertical velocity component. © Coastal Education & Research Foundation 2013.

Kim K.O.,Marine Radionuclide Research Center | Kim D.C.,Hyein E and C Co. | Yuk J.-H.,Disaster Management Technology Research Center | Pelinovsky E.,Nizhny Novgorod State Technical University | Choi B.H.,Sungkyunkwan University
Ocean and Polar Research | Year: 2015

In this paper we investigated the phenomenon of extreme run-up at Babi Island in Indonesia caused by the 1992 Flores earthquake (Mw = 7.8) using a series of three-dimensional numerical modelling experiments. Simulations were carried out to investigate how much the presence/absence of the coast of Flores affects the generation of the extreme inundation at Babi Island through the reflection process of tsunami waves. © 2015 Korea Ocean Research and Development Institute. All rights reserved.

Kim K.O.,Korea Advanced Institute of Science and Technology | Kim D.C.,Hyein E and C Co. | Choi B.H.,Sungkyunkwan University | Jung K.T.,Korea Advanced Institute of Science and Technology | And 2 more authors.
Natural Hazards and Earth System Sciences | Year: 2015

The tsunami generated on 12 July 1993 by the Hokkaido-Nansei-Oki earthquake (Mw =7.8) brought about a maximum wave run-up of 31.7 m, the highest recorded in Japan during the 20th century, near the Monai Valley on the west coast of Okushiri Island (Hokkaido Tsunami Survey Group, 1993). To reproduce the extreme run-up height, the three-dimensional non-hydrostatic model (Flow Science, 2012), referred to here as the NH-model, has been locally applied with open boundary conditions supplied in an offline manner by the three-dimensional hydrostatic model (Ribeiro et al., 2011), referred to here as the H-model. The area of the H-model is sufficiently large to cover the entire fault region with one-way nested multiple domains. For the initial water deformation, Okada's fault model (1985) using the sub-fault parameters is applied. Three NH-model experiments have been performed, namely without islands, with one island and with two islands. The experiments with one island and with two islands give rise to values close to the observation with maximum run-up heights of about 32.3 and 30.8 m, respectively, while the experiment without islands gives rise to about 25.2 m. The diffraction of the tsunami wave primarily by Muen Island, located in the south, and the southward topographic guiding of the tsunami run-up at the coast are, as in the laboratory simulation (Yoneyama et al., 2002), found to result in the extreme run-up height near Monai Valley. The presence of Hira Island enhances the diffraction of tsunami waves but its contribution to the extreme run-up height is marginal. © Author(s) 2015.

Shim J.-S.,Korea Advanced Institute of Science and Technology | Kim J.,Korea Advanced Institute of Science and Technology | Kim D.-C.,Hyein E and C Co. | Heo K.,Korea Advanced Institute of Science and Technology | And 2 more authors.
Journal of Coastal Research | Year: 2013

Severe storm surge inundation was caused by the typhoon Maemi in Masan Bay, South Korea in September 2003. To investigate the differences in the storm surge inundation simulated by three-dimensional (3D) and two-dimensional models, we used the ADvanced CIRCulation model (ADCIRC) and 3D computational fluid dynamics (CFD) model (FLOW3D). The simulation results were compared to the flood plain map of Masan Bay following the typhoon Maemi. To improve the accuracy of FLOW3D, we used a high-resolution digital surface model with a few tens of centimeter-resolution, produced by aerial LIDAR survey. Comparison of the results between ADCRIC and FLOW3D simulations shows that the inclusion of detailed information on buildings and topography has an impact, delaying seawater propagation and resulting in a reduced inundation depth and flooding area. Furthermore, we simulated the effect of the installation of a storm surge barrier on the storm surge inundation. The barrier acted to decrease the water volume of the inundation and delayed the arrival time of the storm surge, implying that the storm surge barrier provides more time for residents' evacuation. © Coastal Education & Research Foundation 2013.

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