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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 7
Ann. Geophys., 27, 2633–2642, 2009
https://doi.org/10.5194/angeo-27-2633-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 27, 2633–2642, 2009
https://doi.org/10.5194/angeo-27-2633-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  01 Jul 2009

01 Jul 2009

Freaque waves during Typhoon Krosa

P. C. Liu1, H. S. Chen2, D.-J. Doong3, C. C. Kao4, and Y.-J. G. Hsu5 P. C. Liu et al.
  • 1NOAA Great Lakes Environmental Research Laboratory, Ann Arbor, MI, USA
  • 2NOAA National Centers for Environmental Prediction, Camp Spring, MD, USA
  • 3National Taiwan Ocean University, Keelung, Taiwan
  • 4National Cheng Kung University, Tainan, Taiwan
  • 5Marine Meteorology Center, Central Weather Bureau, Taipei, Taiwan

Abstract. This paper presents a subjective search for North Sea Draupner-like freaque waves from wave measurement data available in the northeastern coastal waters of Taiwan during Typhoon Krosa, October 2007. Not knowing what to expect, we found rather astonishingly that there were more Draupner-like freaque wave types during the build-up of the storm than we ever anticipated. As the conventional approach of defining freaque waves as Hmax/Hs>2 is ineffective to discern all the conspicuous cases we found, we also tentatively proposed two new indices based on different empirical wave grouping approaches which hopefully can be used for further development of effective indexing toward identifying freaque waves objectively.

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