A Study on the surface geometry dependence of urban surface radiation balance
| Project/Area Number |
09680173
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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 |
自然地理学
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| Research Institution | Joetsu University of Education |
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Principal Investigator |
NAKAGAWA Kiyotaka Joetsu University of Education, College of Education, Professor, 学校教育学部, 教授 (70115252)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1999: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | urban climate / radiation balance / albedo / surface temperature / surface geometry / 衛星リモートセンシング / 模型実験 / 数値実験 / 地表面放射収支 / 都市表面形状 / 熱収支 |
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| Research Abstract |
The purpose of the present study is to discuss the surface geometry dependence of the surface heat balance in the urban area. In order to achieve the above purpose, the present study developed technics for inferring the surface albedo and temperature form LANDSAT data, for continuously observing the surface temperatures of urban model by the thermal video, and for numerical simulation of heat balance in the urban area.
From analyzing LANDSAT data, it was found that, in the urban area, the point with lower albedo tended to have high surface temperature, and the point with lower albedo and higher surface temperature had higher building-land ratio and lower sky view-factor.
From continuous observation on surface temperature distribution of the urban model in terms of the thermal video, it was found that the roof, canyon wall and floor have different temperatures each other, which depended on urban surface geometry.
From the numerical simulation, it was found that surface temperatures of roof, canyon wall and floor have clear dependence both on urban surface geometry and on solar elevation.
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Report
(4 results)
Research Products
(17 results)
