RIP CURRENT DYNAMICS AROUND DETACHED BREAKWATERS AT IGARASHI BEACH
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- INUKAI Naoyuki
- 長岡技術科学大学 環境社会基盤工学専攻
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- SAKURAI Ryusuke
- 株式会社本間組 技術開発部
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- YAMAMOTO Hiroshi
- 長岡技術科学大学 技術支援センター環境・建設技術分野
Bibliographic Information
- Other Title
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- 新潟市五十嵐浜における離岸堤付近で発生する離岸流の流況把握
- ニイガタシ イガラシハマ ニ オケル リガンテイ フキン デ ハッセイ スル リガンリュウ ノ リュウキョウ ハアク
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Abstract
The rip current occurs at the wave breaking area near the beach, and the accident that is related to the rip current occurs every year in the world. Some generation mechanisms of the rip current are known. For example, about the rip current at the sand beach that has the cusp topography. However, the rip current occurs near the structures such as the groins or the detached breakwaters. In Niigata, there is not many large beach, and ordinary the beach is semi-enclosed by the groins or the detached breakwaters those were built to protect from the coastal erosion.<br> This study tried to know the current regime of the rip current at the semi-enclosed beach by detached breakwaters. Firstly, this study made the field survey, and comprehended the scale and velocity of the rip current. In this method, the rip current was pigmented by the sea water colorant, and the pigmented current was observed by the UAV. Secondary, this study reproduced the rip current by the numerical simulation. Finally, this study concerned that the rip currents occur at both end of the cusp topography, and the wave conditions will be decided whether the both currents will merge or not.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 73 (2), I_1465-I_1470, 2017
Japan Society of Civil Engineers