1996 Fiscal Year Final Research Report Summary
Change of Thermal Environment due to Urbanization
| Project/Area Number |
07458124
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | KEIO UNIVERSITY |
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Principal Investigator |
KUBO Sachio Keio University, Faculty of Environmental Information, Professor, 環境情報学部, 教授 (40107694)
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| Co-Investigator(Kenkyū-buntansha) |
WANGLIN Yan Musashi Institute of Technology, Faculty of Environmental Information, Associate, 環境情報学部, 助教授 (10255573)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Heat island / Land use / GPS / Energy use / open water surface / vegetation / ground roughness / reclamation |
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| Research Abstract |
This study aimed to understand how urbanization acts as factors to cahnges of thernal environments in the cities. Industrialization of society have lead urbanization and increased demands for energy.
Land use acted in several ways to thermal environment : (1) change of surface from soils to hard surface, mainly concrete, (2) decrease of vegetated area, (3) decrease of open water surface, (4) increased roughness of ground, (5) loss of wind pass. Surface material change and loss of vegetation and water surface decreased evapolation and humidity, changed urban area as "deserts." Particularly, large reclamation of bay area is one of the major reasons of heat island formation. Aggromeration of taller buildings increased ground roughness, which increased thermal reflection between buildings and ground, as well as between buildings. Walls formed by tall buildings block wind flow. In this reasearch, relationship between local land use and temperature has been analyzed. Also the effect of open water surface as mitigator of climate was recognised. GPS based automated mobile monitoring system enabled quantitative analysis of thermal environment.
Increased energy demands is another factor for thermal environment change. Warming urban climate leads incraesed use of air conditioners, which increase heat release, and again push up temperature. Also modal shift of transportation from public transportation systems to private cars and trucks is another major factor of artificial heat release.
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