INVESTIGATION OF SUITABLE ANALYSIS PERIOD OF TIME FOR IMAGE AVERAGING TO DETECT RIP CURRENT

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  • 離岸流検出のための画像平均化の適切な解析時間の検討
  • リガンリュウ ケンシュツ ノ タメ ノ ガゾウ ヘイキンカ ノ テキセツ ナ カイセキ ジカン ノ ケントウ

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Abstract

<p> In Japan, the main cause of drowning accidents are rip currents which account for more than 40 percent of the natural factors of drowning. This is because almost all beach users cannot recognize the rip current areas. On the other hand, an analysis of image averaging using consecutive photo data can research the rip current over a long period of time, but it requires a huge amount of image data. A suitable analysis period of time required for detecting the rip current, however, has not been studied. This study aims to investigate this. As a result, in case of H1/3=0.7 m, T1/3=6.6 s, H1/3=0.5 m, T1/3=7.4 s, H1/3=0.6 m, T1/3=6.9 s, it was found that an analysis period of 1, 2, 3 and 4 minutes was suitable for detecting the flash rip current. In addition, that of 15, 25, 30, 40 and 80 minutes was suitable for detecting the fixed rip current.</p>

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