FIELD OBSERVATION OF LONGSHORE AND RIP CURRENT USING IMAGERIES OF WEB CAMERA INSTALLED ON HOKOTA COAST
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- OHTANI Yasuro
- （一財）土木研究センター 河川・海岸研究部
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- UDA Takaaki
- （一財）土木研究センター なぎさ総合研究所 日本大学理工学部海洋建築工学科
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- OSAKI Yasuhiro
- 前 茨城県土木部河川課
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- NAGANUMA Shingo
- 茨城県鉾田工事事務所道路河川整備課
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- SAN-NAMI Toshiro
- 海岸研究室（有）
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- OOKI Yasuhiro
- （株）水圏科学コンサルタント
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- ICHIMURA Yasushi
- 日本ミクニヤ（株）
Bibliographic Information
- Other Title
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- 鉾田海岸におけるwebカメラによる沿岸流・離岸流の発生状況の観測
- ホコタ カイガン ニ オケル web カメラ ニ ヨル エンガンリュウ ・ リガンリュウ ノ ハッセイ ジョウキョウ ノ カンソク
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Abstract
The method developed by Lippmann and Halman, in which the imageries taken by a video or web camera are employed to observe water depth in the surf zone and the formation of a bar and trough, was applied to the observation around No. 29 artificial headland on the Hokota coast facing the Pacific Ocean. Typhoon No. 21 hit the coast with storm waves of H1/3 = 5.4 m, T1/3 = 15.4 s on October 23, 2017, and then calm wave condition continued. During this period, the direction of longshore channel, where longshore currents are developing, changed offshore to form a rip channel while cutting the bar, and a rip head was formed offshore of outer bar. Furthermore, it was found that a rip current always develops along the north side of No. 29 artificial headland because of its wave-sheltering effect.
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) 74 (2), I_91-I_96, 2018
Japan Society of Civil Engineers