Frequency Domain Response at Pacific Coast Harbors to Major Tsunamis of 2005–2011

Tsunamis waves caused by submarine earthquake or landslide might contain large wave energy, which could cause significant human loss and property damage locally as well as in distant region. The response of three harbors located at the Pacific coast (i.e. Crescent City Harbor, Los Angeles/Long Beach...

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Bibliographic Details
Published in:Pure and applied geophysics 2013-06, Vol.170 (6-8), p.1149-1168
Main Authors: Xing, Xiuying, Kou, Zhiqing, Huang, Ziyi, Lee, Jiin-Jen
Format: Article
Language:English
Subjects:
Coasts
Computation
Computer simulation
Earth and Environmental Science
Earth Sciences
Earthquakes
Energy dissipation
Frequencies
Frequency domains
Gauges
Geophysics/Geodesy
Harbors
Landslides
Mathematical models
Seismic activity
Spectral analysis
Tidal waves
Tsunamis
Water depth
Wave energy
Wave refraction
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Summary:Tsunamis waves caused by submarine earthquake or landslide might contain large wave energy, which could cause significant human loss and property damage locally as well as in distant region. The response of three harbors located at the Pacific coast (i.e. Crescent City Harbor, Los Angeles/Long Beach Port, and San Diego Harbor) to six well-known tsunamis events generated (both near-field and far-field) between 2005 and 2011 are examined and simulated using a hybrid finite element numerical model in frequency domain. The model incorporated the effects of wave refraction, wave diffraction, partial wave reflection from boundaries, entrance and bottom energy dissipation. It can be applied to harbor regions with arbitrary shapes and variable water depth. The computed resonant periods or modes of oscillation for three harbors are in good agreement with the energy spectral analysis of the time series of water surface elevations recorded at tide gauge stations inside three harbors during the six tsunamis events. The computed wave induced currents based on the present model are also in qualitative agreement with some of the reported eye-witness accounts absence of reliable current data. The simulated results show that each harbor responded differently and significantly amplified certain wave period(s) of incident wave trains according to the shape, topography, characteristic dimensions and water depth of the harbor basins.
ISSN:0033-4553
1420-9136
DOI:10.1007/s00024-012-0526-0