TSUNAMI RESONANCE IN THE BAY OF CONCEPCION, CHILE

Rafael Aranguiz; Mauricio Villagrán; Miguel Esteban; Tomoya Shibayama

doi:10.9753/icce.v34.currents.18

No. 34 (2014), Swash, Nearshore Currents, and Long Waves

No. 34 (2014)

TSUNAMI RESONANCE IN THE BAY OF CONCEPCION, CHILE

Swash, Nearshore Currents, and Long Waves

Published 2014-10-30

Rafael Aranguiz⁺⁻
Mauricio Villagrán⁺⁻
Miguel Esteban⁺⁻
Tomoya Shibayama⁺⁻

Rafael Aranguiz

Department of Civil Engineering, Universidad Catolica de la Ssma Concepcion. National Research Center for Integrated Natural Disasters and Management (CIGIDEN) CONICYT/FONDAP/15110017

Mauricio Villagrán

Department of Civil Engineering, Universidad Catolica de la SSma Concepción

Miguel Esteban

Graduate School of Frontier Science, The University of Tokyo, Japan.

Tomoya Shibayama

Department of Civil and Environmental Engineering, Waseda University, Japan

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Supplementary Files

First 3 natural oscillation modes of the Bay of Concepcion computed by means of EOF.

Keywords

tsunami resonance
Bay of Concepción
shelf resonance
fundamental mode
2010 tsunami
1960 tsunami.

How to Cite

TSUNAMI RESONANCE IN THE BAY OF CONCEPCION, CHILE. (2014). Coastal Engineering Proceedings, 1(34), currents.18. https://doi.org/10.9753/icce.v34.currents.18

Abstract

Natural oscillation modes of the Bay of Concepcion are determined by means of Empirical Orthogonal Functions. Simulations of the 2010 and 1960 tsunamis were performed using 4 nested grids of 120, 30, 6 and 1† arc resolution with the NEOWAVE model. In addition, a spectral analysis of tsunami waveforms at both the continental shelf and inside the Bay of Concepcion was performed, and the results were contrasted with natural oscillation periods. The results showed that the natural oscillation period of the first, second and third modes of the Bay were found to be 95, 37 and 32 min. It was found that large tsunami amplifications at the southern shore of the Bay of Concepcion were due to tsunami resonance and coupling between the shelf resonance and bay oscillations. Large inundations heights during 2010 tsunami were caused by the tsunami exciting the fundamental oscillation mode of the Bay. The relative low inundation during the 1960 tsunami was due to the tsunami exciting the higher frequency.

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References

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TSUNAMI RESONANCE IN THE BAY OF CONCEPCION, CHILE

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