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| Titel |
Characteristics of abnormal large waves measured from coastal videos |
| VerfasserIn |
J. Yoo, D.-Y. Lee, T.-M. Ha, Y.-S. Cho, S.-B. Woo |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 10, no. 4 ; Nr. 10, no. 4 (2010-04-29), S.947-956 |
| Datensatznummer |
250008097
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| Publikation (Nr.) |
 copernicus.org/nhess-10-947-2010.pdf |
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| Zusammenfassung |
| 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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