A STUDY ON BEACH CUSP FORMATION AT JOGEHAMA BEACH

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  • INUKAI Naoyuki
    長岡技術科学大学 技学院環境社会基盤工学専攻
  • TSUKADA Yoshiki
    株式会社ドーコン 環境事業本部農業部
  • YAMAMOTO Hiroshi
    長岡技術科学大学 技術支援センター教育・研究支援部門基礎教育支援グループ

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Other Title
  • 新潟県上下浜海岸におけるカスプ地形の生成要因に関する研究
  • ニイガタケン ジョウゲハマ カイガン ニ オケル カスプ チケイ ノ セイセイ ヨウイン ニ カンスル ケンキュウ

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Abstract

 The accident that three children and two adult males who tried to rescue the children died occurred at Jogehama beach in 2014. The beach was known in the around area for the small cusp topography and steep slope. Therefore, the beach was the swimming prohibited area, and they played on the beach when the accident occurred. However, the big wave suddenly run up to the beach, and the children were swept out to sea. Our group comprehended the wave run up dynamics by the numerical simulation. However, we did not considered the mechanism about the cusp topography, how was it made. Therefore, we have to comprehend the mechanism, because, the wave run up distance from the shoreline is accelerated dut to the current converge in the bottom of cusp topography. We tried to comprehend the cusp formed condition, in this case, we considered the wave condition, and calculated the cusp length and the wave run up distance from the shoreline, etc. Furthermore, we tried to comprehend the weather pattern in which the accident may be occurred.

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