FREQUENCY-BASED HARBOR RESPONSE TO INCIDENT TSUNAMI WAVES IN AMERICAN SAMOA

Ziyi Huang; Jiin-Jen Lee

doi:10.9753/icce.v33.currents.10

No. 33 (2012), Swash, Nearshore Currents, and Long Waves

No. 33 (2012)

FREQUENCY-BASED HARBOR RESPONSE TO INCIDENT TSUNAMI WAVES IN AMERICAN SAMOA

Swash, Nearshore Currents, and Long Waves

https://doi.org/10.9753/icce.v33.currents.10

Published 2012-12-15

Ziyi Huang⁺⁻
Jiin-Jen Lee

Ziyi Huang

Department of Civil and Environmental Engineering, University of Southern California

Jiin-Jen Lee

PDF

Supplementary Files

Animation Of Wave Oscillations In Pago Pago Harbor, American Samoa With The Fundamentl Resonance Mode

PDF File Of The Oral Presentation Of ICCE2012 In Santander, Spain

Keywords

tsunami waves
American Samoa
Pago Pago Harbor
frequency-based model
fundamental resonance mode
local response
mode shape
near-field tsunami

How to Cite

Huang, Z., & Lee, J.-J. (2012). FREQUENCY-BASED HARBOR RESPONSE TO INCIDENT TSUNAMI WAVES IN AMERICAN SAMOA. Coastal Engineering Proceedings, 1(33), currents.10. https://doi.org/10.9753/icce.v33.currents.10

Abstract

September 29, 2009 Samoa tsunami attacked Pago Pago Harbor, the major harbor in American Samoa. The original tsunami waves were greatly amplified when they propagated into the harbor, causing extensive inundations and thus fatalities and village damages. A frequency-based numerical model developed by Lee and Xing (2010) was utilized to investigate the mechanism of the amplification. The fundamental resonance mode of the harbor was identified as 18-minutes period based on the average water depth; the computed amplification factor, defined as the ratio of responded wave amplitude to incoming wave amplitude, was quite large on the fundamental mode at the interior of the harbor. Tidal gauge measurements of several other tsunami events in Pacific Ocean verified the simulation results and further corroborated the local response due to the topography and bathymetry of the harbor is responsible for the amplification of incoming waves. An unfounded speculation was discussed to interpret the distinguishing frequency distribution of wave spectral density in the Samoa tsunami event.

https://doi.org/10.9753/icce.v33.currents.10

PDF

References

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FREQUENCY-BASED HARBOR RESPONSE TO INCIDENT TSUNAMI WAVES IN AMERICAN SAMOA

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