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Journal of Korean Society of Coastal and Ocean Engineers > Volume 30(6); 2018 > Article
J Korean Soc Coast Ocean Eng 2018;30(6): 263-269. doi: https://doi.org/10.9765/KSCOE.2018.30.6.263
시간이력 및 공간분포를 지닌 지반운동에 의한 지진해일 발생 및 전파: 해석적 접근
정태화1, 손상영2
1한밭대학교 건설환경공학과
2고려대학교 건축사회환경공학부
Propagation of Tsunamis Generated by Seabed Motion with Time-History and Spatial-Distribution: An Analytical Approach
Taehwa Jung1, Sangyoung Son2
1Department of Civil and Environmental Engineering, Hanbat National University
2School of Civil, Environmental, and Architectural Engineering, Korea University 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
Corresponding author: Sangyoung Son ,Tel: +82-2-3290-4865, Fax: + 82-2-3290-5999, Email: sson@korea.ac.kr
Received: November 5, 2018;  Revised: December 6, 2018.  Accepted: December 12, 2018.
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ABSTRACT
Changes in water depth caused by underwater earthquakes and landslides cause sea surface undulations, which in turn propagate to the coast and result in significant damage as wave heights normally increase due to the wave shoaling process. Various types of numerical models have been developed to simulate the generation and propagation of tsunami waves. Most of tsunami models determine the initial surface of the water based on the assumption that the movement of the seabed is immediately and identically transmitted to the sea surface. However, this approach does not take into account the characteristics of underwater earthquakes that occur with time history and spatial variation. Thus, such an incomplete description on the initial generation of tsunami waves is totally reflected in the error during the simulation. In this study, the analytical solution proposed by Hammack (1973) was applied in the tsunami model in order to simulate the generation of initial water surface elevation by the change of water depth with time history and its propagation. The developed solution is expected to identify the relationship among various type of seabed motions, initial surface undulations, and wave speeds of elevated water surfaces.
Keywords: time-delayed bottom variation, tsunami, analytical solution, tsunami model, initial surface elevation, Laplace-Fourier transformation
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