1993 Fiscal Year Final Research Report Summary
Investigation of heavy shoaling process in small-or middle-scale harbors based on non-equilibrium suspended sediment transport analysis and field observation
| 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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| Keywords | heavy shoaling of Harbor / field observation / non-equilibrium suspended sediment transport / horizontal large-scale eddies / long-period motion |
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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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[Publications] Matsumoto, R., Matsuoka, M., Nakayama, A., Yamamoto, J., Nadaoka, K.and Yagi, H.: "An attempt of long-term field observation to clarify the mechanism of heavy shoaling process in small-or middle-scale harbors" Proc.of Coastal Eng., JSCE. Vol.40. 491-495 (1993)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Nakayama, A., Yamamoto, J., Matsuoka, M., Ikeda, M., Takeuchi, S., Nadaoka, K.and Yagi., H.: "Field observation of horizontal large-scale eddies generated at the entrance of small-or middle-scale harbors" Proc.Coastal Eng., JSCE. Vol.41. 321-325 (1994)
Description
「研究成果報告書概要(欧文)」より
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