摘要：We performed current velocity observations on Naissaar Bank in northern Tallinn Bay, Gulf of Finland, for five weeks in late autumn 2008 using a bottom-mounted ADCP deployed at 8 m depth. Strong and variable, mainly southerly winds with speeds exceeding 10 m s –1 dominated in the area during 60% of the whole period. Bursts of seiche-driven currents with periods of 31, 24, 19.5, 16 and 11 h were observed after the passage of wind fronts. Inertial oscillations and diurnal tidal currents were relatively weak. The low- frequency current velocities gradually decreased toward the bottom at 3 cm s –1 over 4-m distance. The magnitude of the complex correlation coefficient between the current and wind for the whole series was 0.69, but it was much higher (up to 0.90) within the shorter steady wind periods. The current was rotated ~35° to the right from the wind. As an excep- tion, during one period a counterclockwise surface-to-bottom veering of the current vector was observed. A topographically steered flow was seen either along isobaths of the bank during strong winds or along the ‘channel’ at the entrance to Tallinn Bay.
