Estimation of Extreme Sea Levels Reflecting Tide-Surge Characteristics

Tide-surge characteristics of the West/South domestic coasts were analyzed with a tool of EST (empirical simulation technique).As a result, stations of Incheon, Gunsan, Mokpo and Busan are categorized as tide-dominant coasts, while Yeosu, Tongyoung and Busan are as surge-dominant coasts.In the tide-dominant coasts, extreme sea level of less than 50-yr frequency is formed without typhoon-surge, while only 10-yr extreme sea level is formed in the surge-dominant coasts.As the results of casual condition of extreme sea level formation considering the relative degree of surge on tide, the regional characteristics were detected also.Three methods for estimating the design tide level were compared.The AHHW method shows an unrealistic outcomes of the concern of over estimate design.Furthermore, the probability distribution function method has been concerned as causing missing data if a huge typhoon occurs in a neap tide or a low tide.To cope with these drawbacks, the applicability of the EST method is proved to be suitable especially in tide-dominant coasts.