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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 10, issue 4 | Copyright
Nat. Hazards Earth Syst. Sci., 10, 947-956, 2010
https://doi.org/10.5194/nhess-10-947-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  29 Apr 2010

29 Apr 2010

Characteristics of abnormal large waves measured from coastal videos

J. Yoo1, D.-Y. Lee1, T.-M. Ha2, Y.-S. Cho2, and S.-B. Woo3 J. Yoo et al.
  • 1Korea Ocean Research and Development Institute, Ansan, Korea
  • 2Department of Civil & Environment Engineering, Hanyang University, Seoul, Korea
  • 3Department of Oceanography, Inha University, Incheon, Korea

Abstract. Recently, tsunami-like sea-level oscillations occurred in a region of the west coast of Korea (i.e. in the eastern part of the Yellow Sea), during a typical rough spring weather episode on 4 May 2008. The analysis of these tsunami-like abnormal waves focuses solely on the videos recorded by a CCTV surveillance system in the directions of the entrance and inside parts of a local coastal pocket beach. Time-series of the vertical and horizontal sea surface oscillations were extracted from the video recordings through calibrating image distortions, accumulating 1-D intensity arrays along the line transects of interest in time, and identifying the trajectories of the oscillations. Frequency and time-domain analysis of the time-series signals revealed that the maximum height of the tsunami-like waves reached 1.3 m, having a dominant period of 185 s (3.1 min). In addition, the results indicate that the celerity of the maximum height wave approximated 7.3 m/s, which lead to the losses of life of several people who could not escape immediately from the fast tsunami flooding the shore.

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