| Project/Area Number |
13650573
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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 | Tokyo University of Science |
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Principal Investigator |
NISHIMURA Tsukasa Tokyo University of Science, Faculty of Sci. and Tech., Professor, 理工学部, 教授 (40103064)
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| Co-Investigator(Kenkyū-buntansha) |
NIHEI Yasuo Tokyo University of Science, Faculty of Sci. and Tech., Lecturer, 理工学部, 講師 (60262268)
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2002: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2001: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | Oceanic turbulence / Satellite-image analysis / Numerical simulation / Coastal environment / Kuroshio / Nesting procedure / TOPEX / Poseidon / Seamark method / 衛生データ解析 / 現地観測 |
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| Research Abstract |
Ocean currents such as the Kuroshio and Oyashio, which strongly influence on the flow fields around Japan-Island-China, are characterized by the mesoscale eddies with the representative horizontal length scale of a few hundreds kilometers. Although the behaviors of the mesoscale eddies are closely related with the coastal environments, there are a number of unknown factors for the dynamical evolution of the mesoscale eddies. On the other hand, the head investigator in this project has monitored the large-scale patterns of the water temperature and velocity vectors on sea surfaces with the image processing for the polar orbiting meteorological satellite NOAA, and then attempted to examine ocean current structures and the actual motion of mesoscale eddies around Japan-Island-Chain. For further evolutions of the above study, we here tried to develop an accurate tool to evaluate coastal currents with the satellite-image processing and numerical simulations. The main results of the project
… More
are expressed in the followings
(1) Measurements for oceanic turbulence with the satellite-image analysis
We have conducted flow visualizations and sea-surface velocity measurements with NOAA/VHRR thermal infrared data. Every day the monitoring of the oceanic turbulence has been continuously performed by directly capturing the satellite data in our office. Combing the above satellite-based data and other published data concerning the oceanic turbulence, we have constructed the database for the oceanic turbulence around Japan-Island-Chain
(2) Coastal current simulations with improved numerical models
To effectively incorporate offshore influences on coastal current simulations, a new one-waynesting procedure for coastal current model was developed and then applied to the coastal current simulation around an isolated island. Furthermore, we presented the two-way interactive nesting procedure to modify the above nesting model. We also attempted to improve the numerical accuracy of the 3D numerical models with special attentions to the hydrostatic approximation and sigma-coordinates Less
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