| Project/Area Number |
59460143
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Hydraulic engineering
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| Research Institution | Osaka University |
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Principal Investigator |
MUROTA Akira Professor,Department of Civil Engg.Osaka Univ., 工学部, 教授 (50028924)
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| Co-Investigator(Kenkyū-buntansha) |
MICHIOKU Kohji Research Associate, Department of Civil Engg. Osaka Univ., 工学部, 助手 (40127303)
NAKATSUJI Keiji Associate Professor, Department of Civil Engg. Osaka Univ., 工学部, 助教授 (10029324)
MURAOKA Kohji Chief, Water and Soil Environment Division, National Institute for Environmental, 水質土壌環境部, 部長 (90029017)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥6,300,000 (Direct Cost: ¥6,300,000)
Fiscal Year 1986: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1985: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1984: ¥4,000,000 (Direct Cost: ¥4,000,000)
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| Keywords | Thermohydraulics / Density Current / Lake / Reservoir / Mixing / Numerical Analysis / 湖沼 / 貯水池 |
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| Research Abstract |
First, to examine the horizontal heat exchange between the shallow region and deep region in a confined water mass, Murota and Michioku carried out a laboratory experiment using a two dimensional container. Second, they developed a theory on the internal seiching motion in complicated horizontal geographical conditions. Their theory is verified by comparing it with the experiments. Finally they experimentally examined the vertical mixing process induced by the combination of the mechanical and thermal stirring.
Muraoka carried out a field survey in Lake Chuzenji focusing on the boundary mixing phenomenon in the nearshore zone. He found that the frequency of the internal fluctuation there was about two or three times order of the Brunt-Vaisala frequency. He also developed a theory for the internal wave deformation on the sloping bed. The theory was verified experimentally.
Nakatsuji applied the k- <epsilon> turbulence model to the analysis of the buoyant surface jet. He succeeded in reproducing not only the velocity and buoyancy fields but also the appearance of the vertical circulation associated with the boundary effects. Extending the two-dimensional model to the three-dimensional fields, he analyzed the river plume development and the tidal current in Osaka Bay.
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