Annual Journal of Civil Engineering in the Ocean Vol.38
STUDY OF METHOD FOR DETECTING OCCURANCE OF RIP CURRENT USING IMAGE ANALYSIS
2022 Volume 78 Issue 2 Pages I_229-I_234
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2022 Volume 78 Issue 2 Pages I_229-I_234
In this study, we investigated a method for detecting the occurrence of unsteady rip currents using image averaging from images taken by a web camera installed on the Wakasa-wada coast. As a result of comparison between the judgment of the occurrence of rip currents by this method and that of three experienced lifesavers, the accuracy rate was 99.4% in the analysis using the test data, and 56.9% in the validation data. It was found the accuracy decreased under the following conditions: early morning (7 to 8 a.m.), evening (16 pm or after), cloudy and rainy. On the other hand, for wave heights of 0.5 m or greater in the validation data, the accuracy was 75 %. Therefore, it was found that this method has a certain level of accuracy in detecting the occurrence of rip currents at wave heights of 0.5 m or greater.
