Annual Journal of Civil Engineering in the Ocean Vol.38
CHARACTERISTICS OF RIP CURRENT ALONG A JETTY BY IMAGE ANALYSIS
2022 Volume 78 Issue 2 Pages I_223-I_228
Details
2022 Volume 78 Issue 2 Pages I_223-I_228
The main cause of drowning accidents on beaches is rip currents. There are various locations that rip currents occur, but particularly they occur regularly around structures, such as jetties. Therefore, it is effective in preventing drowning accidents that clarification of which conditions rip currents occur. In this study, the occurrence of rip currents around the jetty was investigated by applying image analysis to images taken by a fixed-point camera along the Wakasa-Wada coast of Fukui Prefecture, and by comparing them with observation data of wave and tide. As a result, rip currents were detected in 340 cases (81 %) out of 420 cases. It was considered that rip currents occur regularly regardless of wave and tidal conditions, in the area near the jetties on the subject beach. Therefore, for preventing drowning accidents, it was considered that it was important to thoroughly avoid use near the jetties.
