A Numerical Study of Bathymetrical Effects on Tsunami Wave Propagation in Taiwan
Huang chih chun
Abstract
Although the potential tsunamigenic earthquakes distribute in a wide range of azimuths with respect to Taiwan, historical documents suggest that most tsunami-prone regions in Taiwan are coasts to the north (e.g., Keelung in 1867) and to the southwest (e.g., Tainan in 1661) . Besides source factors, local bathymetrical characteristics also play an important role on the scale of tsunami hazards at specific site. Because near-shore bathymetries around Taiwan vary greatly from region to region . So we investigate the various amplitude of bathymetrical effects on tsunami wave propagation. We talk about this study with 1-D linear and non-linear model. The 1-D linear shallow water wave equations are numerically solved by using finite difference method with staggered grid system (Satake, 2002). The boundary condition is total reflection for land-ocean interface and radiation condition for waves propagating outside the computation region. We select six regions on linear model and five regions on non-linear model to track their bathymetries based on Etopo2 . On the linear model, when the amplitudes are greater than 10th of the water depth, the nonlinear effects become important and we interrupt the computations. Then, we use COMCOT to simulate 1-D non-linear model.
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