RELATIONSHIP BETWEEN LOW-FREQUENCY WATER LEVEL VARIATION IN IMAZU TIDAL FLAT AND CHARACTERISTICS OF SECONDARY UNDULATION IN HAKATA BAY
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- SAITA Tomonori
- 鹿児島大学 学術研究院理工学域
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- SAWAI Takuro
- 鹿児島土木設計株式会社技術部
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- TAI Akira
- 九州大学 大学院工学研究院環境社会部門
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- HASHIMOTO Akihiro
- 福岡大学 工学部社会デザイン工学科
Bibliographic Information
- Other Title
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- 今津干潟における長周期水位変動と博多湾の振動特性の関係
- イマズ ヒガタ ニ オケル チョウ シュウキ スイイ ヘンドウ ト ハカタワン ノ シンドウ トクセイ ノ カンケイ
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Abstract
<p> Tidal flats play an important role in the water environment of the surrounding sea area. In this study, a field observation and numerical analyses were carried out to elucidate characteristics of the resonances in Imazu tidal flat and a relationship between low-frequency water level variations in the Imazu tidal flat and characteristics of secondary undulations in Hakata Bay. As a result, it is clarified that long-period waves with a period roughly from 35 minutes to 60 minutes set up a resonance in Imazu tidal flat. On the other hand, four major types of oscillation in Hakata bay due to the incidence of long-period waves were identified. And it is considered that the water level fluctuation is amplified at the area off Imazu tidal flat by an oscillation of around 60 minutes or 35 minutes. In addition, wind-induced oscillations in Hakata Bay by northeast or southwest winds can be periodic that brings about a resonance in Imazu tidal flat.</p>
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) 75 (2), I_157-I_162, 2019
Japan Society of Civil Engineers