| Project/Area Number |
04650453
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Hydraulic engineering
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
NADAOKA Kazuo Tokyo Inst.of Tech., Graduate School of Information Science and Eng., Professor, 大学院・情報理工学研究科, 教授 (70164481)
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| Co-Investigator(Kenkyū-buntansha) |
加藤 一正 運輸省港湾技術研究所, 漂砂研究室, 室長
YAGI Hiroshi Tokyo Inst.of Tech., Faculty of Eng., Lecturer, 工学部, 講師 (80201820)
KAZUMASA Kato Head of Littoral Drift Laboratory, Port and Harbor Research Institute, Ministry
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1993: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1992: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | heavy shoaling of Harbor / field observation / non-equilibrium suspended sediment transport / horizontal large-scale eddies / long-period motion / 剥離渦 |
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| Research Abstract |
Through the field observation conducted at Iioka fishery Harbor in the periods from September 22 to October 14 in 1992 and from September 13 to October 25 in 1993, the mechanism of heavy shoaling of small-or middle-scale harbors has been investigated. The main findings in the field-data analysis are as follows.
(1)Long-period motion in the water surface and horizontal velocity fluctuation was observed at the harbor entrance.
(2)This long-period motion is generated by combined mechanism due to incident-wave groupiness and harbor amplification.
(3)The long-period motion causes the flow separation at the harbor-entrance edges of the breakwater, which results in the generation of horizontal large-scale eddies. These eddies may suspend the appresiable amount of bottom sediment, which is then transported by the long-period motion towards the calm area in the harbor.
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