Abstract
The purpose of this study was to investigate rip current generation under calm sea condition, i.e. good condition for sea bathing. A two-week continuous measurement of near-shore currents was carried out at two stations near the breakwater of a fishery harbor at Sagara coast, Shizuoka. Characteristics of the rip current such as time variation, spectral features and vertical structure were discussed based on the data. Generation mechanism of the rip current was also discussed associated with wave properties and wind conditions. Sudden velocity increase up to 0.2m/s was observed for 1 - 2 hours under very calm condition, which does not show very clear relationship with wave and wind conditions.
