| Project/Area Number |
09650561
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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 INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
KANDA Manabu Tokyo Institute of Technology, Fuculty of Engineering, Associate Professor, 工学部, 助教授 (90234161)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1997: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | Wind channel effect / Sea breeze front / Heat island / Urban river / T-temp analysis |
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| Research Abstract |
A river has the effect of climate alleviation as a not only cool spot but so called wind channel. Statistical analysis shows the penetration of sea breeze front over Kanto plane is classified into two cases, East or South-wind, influenced by synoptic wind condition. In these two cases the characteristics of the penetration of sea breeze front were investigated. Especially the result of meteorological field observation conducted along Arakawa-river, a typical urban river, shows that the river leads the sea breeze front to inland at South-wind match with river flow. Around secondary scale urban the penetration of sea breeze front are blocked over urban area because of heat island then the front may be surrounding there.
Numerical simulation using RAMS (Regional Atmospheric Modeling System) including two advanced meteorological prediction techniques, FDDA (Four Dimensional Data Analysis) and Multi-grid nesting system, have been performed to investigate the wind field pattern along the river. The results agreed well with field observations, and the complex wind field along the river was simulated very well. As the results, following mechanisms were shown. 1. Wind channel effect is prominent when it is clear day and synoptic wind is calm in summer. 2. The penetration of sea breeze fronts is strongly influenced by the difference of roughness and heat balance between the river and the surrounding area. 3. In case that width of river is large, penetration at the surrounding area is blocked because the cold air is advected from river. 4. Local wind circulation accumulates the pollutants toward the river. The concentration is high at the front edge.
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