Numerical Simulation of Tsunamis that Affected the Coastal Zone of East Sea

J. Ocean Eng. Technol. 2007;21(6):72-80.

Kim Do-Sam,Kim Ji-Min,Lee Kwang-Ho

Division of Construction and Environmental Engineering Korea Maritime University,Department of Civil and Environmental Engineering Graduate School Korea Maritime University,Department of Civil Engineering Nagoya University

동해연안에 영향을 미친 지진해일의 수치시뮬레이션

김도삼,김지민,이광호

한국해양대학교 건설환경공학부,한국해양대학교 대학원 토목환경공학과,일본 나고야대학 공학연구과 사회기반공학

Keywords: 1983 Central east sea earthquake, 1993 Southwest off Hokkaido earthquake, Tsunami

핵심용어: 1983년 동해중부지진, 1993년 북해도남서외해지진, 지진해일

Abstract

The tsunami that resulted from the Central East sea Earthquake, which registered 7.7 on the Richter scale, that occurred over the entire water region in Akita on May. 26, 1983 and the tsunami that was triggered by the Southwest off Hokkaido Earthquake (7.8 on the Richter scale) that occurred in Southwest off Hokkaido on July 12, 1993 are representative cases that led to considerable damage in life and property, not only in Japan but also in Korea. In this study, multi-grid method was used in order to reproduce sufficiently the shoaling effect that occurs as water depth becomes shallow in the shallow water region and moving boundary condition was introduced to consider the runup in the coastal region. For the tsunamis that exerted considerable effect on the East Sea coast of Korea that were caused by the Central East Sea Earthquake in 1983 and the Southwest off Hokkaido Earthquake in 1993, characteristics like water level rise and propagation in the East Sea coast will be examined using numerical simulations. At the same time, these values will be compared with observed values. In addition, maximum water level rise and change in the water level with respect to time that were caused by the tsunamis were examined at each location along the East sea coast. Usefulness of numerical analysis was verified by comparing with observed values.