Numerical simulations of the coastal effects of tsunami waves caused by the 1993 Hokkaido-Nansei-Oki earthquake |
| |
| Authors: | Wenliang Pan Sheng’an Wang Shuqun Cai |
| |
| Institution: | (2) Texas A&M University, College Station, USA; |
| |
| Abstract: | Generally, tsunami waves become hazardous only when approaching the coast. Studying the runup and inundation of tsunami waves
is important for understanding the tsunami evolution and for tsunami hazard assessment. Here, we simulated the 1993 Hokkaido-Nansei-Oki
(HNO) tsunami using a finite-difference model based on nonlinear shallow-water equations. We focused on the runup and inundation
of tsunami wave propagation onto coastal area of Okushiri Island near Hokkaido, Japan, and investigate the relationship of
different runup heights with the morphology and bathymetry of the seashore. In the simulation, a nested 4-layer grid system
and moving boundary technique are adopted to study runup and inundation. The calculated tsunami heights and inundations in
the region agreed well with field measurements. The local bathymetric and topographic characteristics had a first-order effect
on the runup. Numerical experiments show that the focusing of certain local bathymetric features would amplify both wave height
and current velocity remarkably. The results show that computation on dense grids is necessary to reproduce the observed runup
heights, and inundation velocity is an important factor preventing tsunami devastation. In addition, we discussed the potential
capability of sediment transport to illustrate the impact of tsunami waves on coastal geomorphology. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
