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www.nat-hazards-earth-syst-sci.net/10/947/2010/
doi:10.5194/nhess-10-947-2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
Characteristics of abnormal large waves measured from coastal videos
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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Citation: Yoo, J., Lee, D.-Y., Ha, T.-M., Cho, Y.-S., and Woo, S.-B.: Characteristics of abnormal large waves measured from coastal videos, Nat. Hazards Earth Syst. Sci., 10, 947-956, doi:10.5194/nhess-10-947-2010, 2010. Bibtex EndNote Reference Manager XML
