Abstract: Wave set-up and wave-induced current are the significant dynamics for sediment transport, geomorphology and pollutant diffusion in estuaries, however, researches were rare under remote typhoon conditions in the Changjiang Estuary. In this study, we focused on the spatial distribution of wave set-up and wave-induced current under a remote typhoon named “Sanba” by a coupled 3-D model of typhoon-wind, tide and wave. The results showed that the radiation stress and wave set-up increased when wave propagated from the typhoon eye to coast due to wave energy dissipations, the maximum value of wave set-up could reach up to 0.05~0.20 m, which was 15%~22% of the total water level rise induced by typhoon. The along-shore current generated by wave were about 0.05~0.20 m/s, and could reach up to 15%~50% of storm-induced current. It implied that a remote typhoon could have significant influence on wave set-up and wind-induced current. The research could provide the basis for calculation of return period water level and current, sediment transport, geomorphological evolution of subaqueous delta and so on.

Key words: remote typhoon, the Changjiang Estuary, wave set-up, wave-induced current