| Project/Area Number |
08555129
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
水工水理学
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| Research Institution | Toyohashi University of Technology |
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Principal Investigator |
AOKI Shin-ichi Toyohashi University of Technology, Faculty of Engineering, Associate Prof., 工学部, 助教授 (60159283)
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| Co-Investigator(Kenkyū-buntansha) |
MUTSUDA Hidemi Gifu University, Faculty of Engineering, Research Associate, 工学部, 助手 (80273126)
SHINODA Seirou Gifu University, Center for River Basin Environmental Research, Assoc.Prof., 流域環境研究センター, 助教授 (80187369)
MIZUTANI Norimi Nagoya University, Faculty of Engineering, Associate Prof., 工学部, 助教授 (10209760)
KASHIHARA Kenji Nagoya Institute of Tech.Faculty of Engineering, Research Associate, 工学部, 助手 (50262952)
KIOKA Wataru Nagoya Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (10135402)
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| Project Period (FY) |
1996 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1998: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1997: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1996: ¥3,800,000 (Direct Cost: ¥3,800,000)
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| Keywords | Wave observation / Typhoon / Harbor / Long period waves / Secondary oscillation / Currnt / Sediment transport / Internet / 台風時波浪 / 副震動 |
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| Research Abstract |
During the research period, we carried out wave observations three times for the periods of Sep.7, '96 - Oct.19, '96, Sept.10, '97 - Oct.30'97 and Sept.5'98 - Oct.1'98 on the Pacific coast off Akabane harbor using two wave and current meters. We obtained high wave records provided by several typoons passing near the harbor. We also carred out wave and current measurements in the harbor when some of the typhoon became close to the harbor.
On the basis of the wave data, we investigated the characteristics of offshore waves and oscillation in the harbor, where we especially focused on long period waves and studied its amplification and propagation properties. We also developed FEM model to simulate forced oscillation in the harbor, by which we studied oscillation characteristics comparing numerical and observed results. The main results are as follows : (1) The magnitudes of long period waves increase as wave heights increase. The amplitude of long period waves is almost proportional to the product of significant wave height and wave period. (2) Long period waves in offshore zone are comprised of on-offshore components and longshore components at similar degree of magnitudes. By analyzing cross correlations of wave records between two measuring points, we can distinguish incident and reflected waves in each component waves. (3) In Akabane harbor, there exist multiple frequency responses with 100S, 300s and 800s. The numerical simulation, where linear response to linear long waves is assumed, does not give sufficient agreemet with observations.
We developed WWW server to give the service of wave data sharing, where all the wave data are open to public on the internet. In addition to wave data, the data of wind, atomospheric pressure distribution and typhoon trajectories are also involved. About several hundreds times of access to the database have been counted.
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