NHESS Natural Hazards and Earth System Sciences NHESS Nat. Hazards Earth Syst. Sci. 1684-9981 Copernicus Publications Göttingen, Germany 10.5194/nhess-13-3503-2013 Characteristics of high waves observed at multiple stations along the east coast of Korea Oh S.-H. 1 Jeong W.-M. 1 Coastal Development & Ocean Energy Research Department, Korea Institute of Ocean Science and Technology, Ansan 426-744 Republic of Korea 23 12 2013 13 12 3503 3514 Copyright: © 2013 S.-H. Oh 2013 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://nhess.copernicus.org/articles/13/3503/2013/nhess-13-3503-2013.html The full text article is available as a PDF file from https://nhess.copernicus.org/articles/13/3503/2013/nhess-13-3503-2013.pdf

In recent several years, extremely high waves occasionally struck the Korean coast of the East Sea and caused severe coastal disasters almost every winter season. In this paper, characteristics of such high waves are reported by analyzing wave records collected at multiple stations along the east coast of Korea. Meteorological data obtained at relevant weather stations were also used in the analysis. The reason for appearance of the high waves was identified as the strong northeasters due to extra-tropical low pressure systems that had been rapidly developing in the East Sea. The general mechanism concerning the formation and spatial evolution of such strong low pressure systems was more clearly understood through the synthetic analysis of the wave and meteorological data. In particular, the influence of spatiotemporal features of the low pressure system on the resulting characteristics of the high waves was described in more detail in this study. Since the overall wave direction was also northeast, the first wave arrival time on the coastline became later for a wave station whose latitude is lower. At present, however, the arrival time of such high waves on the coast as well as their intrinsic characteristics such as wave height and period are not satisfactorily predicted by the daily weather forecast. Hence, it is necessary to enhance predictability of the high waves by investigating developmental mechanisms of the strong low pressure system in the winter season more thoroughly.

 References Chung, H.-S.: Reviewing the explosively deepening cyclone (cyclonic bomb) over the East Sea with the satellite observations, J. Korean Soc. Remote Sens., 12, 126–138, 1996 (in Korean with English abstract). Earle, M. D., Bush, K. A., and Hamilton, G. D.: High-height long-period ocean waves generated by a severe storm in the northeast Pacific ocean during February 1983, J. Phys. Oceanogr., 14, 1286–1299, 1984. Hasselmann, K.: On the non-linear energy transfer in a gravity-wave spectrum, Part 1. General theory, J. Fluid Mech., 12, 481–500, 1962. Hasselmann, K., Munk, W., and MacDonald, G.: Bispectra of ocean waves, Proc. Symp. On Time Series Analysis, John Wiley, New York, 125–139, 1962. Isozaki, I.: On the characteristics of coastal waves on the coast of Toyama bay (Report I), Notes of Cooperative Research for Disaster Prevention, 25, 3–15, 1971 (in Japanese with English abstract). Isozaki, I. and Yoshio, O.: On the characteristics of coastal waves on the coast of Toyama bay (Report II), Notes of Cooperative Research for Disaster Prevention, 28, 3–17, 1972 (in Japanese with English abstract). Jeong, W.-M., Oh, S.-H., and Lee, D. Y.: Abnormally high waves on the east coast, J. Korean Soc. Coast. Ocean Engrs., 19, 295–302, 2007 (in Korean with English abstract). Jeong, W.-M., Oh, S.-H., Ryu, K.-H., Lee, D. Y., and Chae, J. W: Multi-station observation of the high swell along the east coast of Korea, Proc. 5th Int. Conf. Asian Pac. Coasts, Singapore, CD-ROM, 2009. Kim, T. and Lee, K.: Hindcasting analysis of swells occurred in the east coast in February 2008, J. Korean Soc. Oceanogr., 15, 62–67, 2010. Kitaide, M.: On the mechanism and forecasting of the so-called "Yorimawari" wave, Marine Report of the Central Meteorological Observatory, 2, 125–151, 1952 (in Japanese with English abstract). Lee, H. S.: Abnormal storm waves in the East Sea (Japan Sea) in April 2012. Proc. 12th Int. Coast. Symp., (J. Coast. Res., Special Issue, 748–753,) 2013. Lee, H. S., Kim, K. O., Yamashita, T., Komaguchi, T., and Mishima, T.: Abnormal storm waves in the winter East/Japan Sea: generation process and hindcasting using an atmosphere-wind wave modelling system, Nat. Hazards Earth Syst. Sci., 10, 773–792, <a href="http://dx.doi.org/10.5194/nhess-10-773-2010">https://doi.org/10.5194/nhess-10-773-2010</a>, 2010. Mase, H., Yasuda, T., Tom, T. H., Tsujio, D., and Mori, N.: Forecast and hindcast of waves which caused coastal disasters along Toyama Coasts on February 2009, Proc. 33rd IAHR Congress, 2854–2861, 2009. Oh, S.-H., Jeong, W.-M., Lee, D. Y., and Kim, S. I.: Analysis of the reason for occurrence of large-height swell-like waves in the east coast of Korea, J. Korean Soc. Coast. Ocean Engrs., 22, 101–111, 2010 (in Korean with English abstract). Suh, K. D., Oh, S. H., Hashimoto, N., and Ahn, K.: Laboratory observations of triad interaction of deep water wind waves, Coast. Eng. J., 42, 321–337, 2000. Vanem, E., Natvig, B., and Huseby, A. B.: Modelling the effect of climate change on the wave climate of the World's oceans, Ocean Sci. J., 47, 123–145, 2012.