Abstract
　High waves in the southwestern area of the Japan sea brought about by the severe storm on Feb. 3 to 4, 1987 are hindcast with the use of two kinds of shallow water spectral prediction model, referred to as a point model and a grid model. Comparison of the computation with the observation shows that the finer the mesh size of the grid system used is, the better the agreement between them becomes. Based on the analysis of existing wave data and the wave data hindcast with the point model. the winter storm on Jan. 4 to 5, 1971 as well as the above-mentioned storm is picked up as an extraordinary meteorological disturbance which generated the most extreme waves in the concerned sea area in the past 40 years. Spatial distributions of the maximum wave height during both storms computed with the grid model are compared and the finding is that both storms brought about severe waves with similar height and pattern in the concerned area. At the 4 selected points in the area, wave height with return period of 100 years and return period of extreme waves generated by the above-mentioned storms are evaluated with the use of the Gumbel distribution fitted to annual maximum wave height data.

【キーワード】：波浪の極値，日本海，浅海波浪推算，スペクトルモデル
Key words: extreme waves, the Japan Sea, hindcast of shallow water waves, spectral model

*愛媛大学工学部海洋工学科
Department of Ocean Engineering, Faculty of Engineering, Ehime University
**大阪府土木部
Bureau of Civil Engineering, Osaka Prefectural Office