Abstract
　In this paper, the authors's numrical model or nearshore currents using a cnoidal wave theory for the estimation of wave characteristics is extended to be applicable to coastal areas with a complicated shoreline. For this purpose, wave transformation is computed by making use of a characteristic method following the wave rays instead of the finite difference scheme used in the previous model. First, wave height variation and longshore current profile on a uniformly sloping beach computed by both the models are shown to be in good agreement. Next, the model is applied to the nearshore current computation on model topographies with a complicated shoreline such as a semi-circular bay, convex cape and arbitrarily-curved bay. The comparison of the resulting nearshore current patterns with those of the authors's model using the small amplitude wave theory reveals their gross similarity and a slight difference concerning the positions of breaker line and circulation cell center, and meandering intensity or longshore currents.

【キーワード】：海岸災害, 海浜流モデル, クノイド波, 任意汀線地形

*愛媛大学工学部海洋工学科
Department of Ocean Engineedng, Faculty of Engineering Ehime Univ.
**富士通エフ・アイ・ピー株式会社
Fujitsu F.I.P.Inc.
***愛媛大学大学院工学研究科
Craduate Course of Ocean Engineering, Ehime Univ.