Characteristics of abnormal large waves measured from coastal videosopen access
- Authors
- Yoo, J.; Lee, D. -Y.; Ha, T. -M.; Cho, Y. -S.; Woo, S. -B.
- Issue Date
- Apr-2010
- Publisher
- COPERNICUS GESELLSCHAFT MBH
- Citation
- NATURAL HAZARDS AND EARTH SYSTEM SCIENCES, v.10, no.4, pp.947 - 956
- Indexed
- SCIE
SCOPUS
- Journal Title
- NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
- Volume
- 10
- Number
- 4
- Start Page
- 947
- End Page
- 956
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/175219
- DOI
- 10.5194/nhess-10-947-2010
- ISSN
- 1561-8633
- 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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