Study on Air-Sea Gas Transfer at Natural Coast
| Project/Area Number |
08650614
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
水工水理学
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| Research Institution | Osaka city University |
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Principal Investigator |
KAKUNO Shohachi Osaka City Univ., Faculty of Engineering Associate Prof., 工学部, 助教授 (70047398)
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| Co-Investigator(Kenkyū-buntansha) |
SHIGEMATSU Takaaki Osaka City Univ., Faculty of Engineering, Research Associate, 工学部, 助手 (80206086)
KANJO Yoshinori Osaka City Univ., Faculty of Engineering, Research Associate, 工学部, 助手 (90177759)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1997: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1996: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | REAERTION / AERATION / WAVE SURFACE / BREAKER / MASS TRANSFER / BEACH |
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| Research Abstract |
Experimental and theoretical research to evaluate the mass transfer coefficient at the surfaces of non-breaking waves, on the surfaces of waves in frout of coastal structures, and on the breaker zone on a model beach was performed. The following is obtained as results.
1.Reaeration on the surfaces of non-breaking waves : Data from a middle-scale wave tanktests were examined with data which have been obtained using a small-scale wave tank. It was shown that the reaeration at the surfaces of non-breaking waves should be causeb by energy dissipation due to internal friction, and due to frictions at side walls and bottom of the tank. On the basis of the examination, we proposed a method to predict the mass transfer coefficient in full scale at the surfaces of non-breaking waves in the real sea. In addition, some calculations on the real seas were performed for comparison with the value proposed by Horie.
2. Reaeration on the surfaces of waves in front of coastal structures : Experiments to measure the mass transfer coefficient on the surfaces of waves in frout of sea wall were performed using a small-scale wave tank. The effects of the weights of armor units were also examined.
3. Reaeration on the breaker zone on a model beach : Reaeration on the breaker zone on a model beach was examined. Attention was paid to the effects of the slopes of a beach, and to the effects of the scale of waves. From the examination, it was shown that the mass transfer coefficient has a strong and unique relationship with energy dissipation rate, despite the bottom slope, the type of breaking, and the wave period.
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Report
(3 results)
Research Products
(14 results)
