Three‐dimensional simulation of tsunami run‐up around conical island |
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| Authors: | Byung Ho Choi Dong Chule Kim Efim Pelinovsky Seung Buhm Woo |
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| Institution: | 1. Department of Civil and Environmental Engineering, Sungkyunkwan University, Chunchun‐dong 300, Jangan‐gu, Suwon 440‐746, Republic of Korea;2. Institute of Applied Physics, Russian Academy of Sciences, 46 Uljanov Street, 603950, GSP‐120, Nizhny Novgorod, Russia;3. Department of Ocean Science, Inha University, Yonghyun‐dong 253, Nam‐gu, Incheon 402‐751, Republic of Korea |
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| Abstract: | At the circular Babi Island in the Flores tsunami (1992) and pear shaped island in the Okushiri event (1993), unexpectedly large tsunami run‐up heights in the lee of conic islands were observed. The flume and basin physical model studies were conducted in the Coastal Hydraulic Laboratory, Engineering Research and Development Center, U.S. Army Corps of Engineers to provide a better understanding of the physical phenomena and verify numerical models used in predicting tsunami wave run‐up on beaches, islands, and vertical walls. Reasonably accurate comparison of run‐up height of solitary waves on a circular island has been obtained between laboratory experimental results and two‐dimensional computation model results. In this study we apply three‐dimensional RANS model to simulate wave run‐up on conical island. In the run‐up computation we obtain that 3D calculations are in very good comparison with laboratory and 2D numerical results. A close examination of the three‐dimensional velocity distribution around conical island to compare with depth‐integrated model is performed. It is shown that the velocity distribution along the vertical coordinate is not uniform: and velocity field is weaker in the bottom layer and higher on the sea surface. The maximum difference (about 40%) appears at the time when solitary wave reached the circular island. |
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| Keywords: | Tsunami Conical island Three‐dimensional computation model |
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