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1997 Fiscal Year Final Research Report Summary

Study on the urban canopy model to evaluate the atmospheric environmental formation technique of the city harmonized with environment.

Research Project

Project/Area Number 07458122
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental dynamic analysis
Research InstitutionOsaka University

Principal Investigator

YAMAGUCHI Katsuhito  Faculty of Eng., Osaka University, Professor, 工学部, 教授 (90029166)

Co-Investigator(Kenkyū-buntansha) KONDO Akira  Faculty of Eng., Osaka University, Assistant Professor, 工学部, 助手 (20215445)
KAGA Akikazu  Faculty of Eng., Osaka University, Associated Professor, 工学部, 助教授 (90029265)
Project Period (FY) 1995 – 1997
Keywordsurban canopy / sky view factor / heat island / radiation / Monte Carlo method
Research Abstract

The averaged minimum temperature in August at Osaka City is rising about 2 degrees in 100 years. It can be considered that the cause induced heat island phenomenon is the increase of energy consumption and the alteration of the ground surface. In this study, we simulated the influence of the building configration on the wind velocity and potential temperature within the urban canopy layr, using one dimensional atmospheric boundary layr model. It assumed that the building of the same size had been regularly arranged in the shape of a lattice within the urban canopy, and the shortwave radiation and long wave radiation fluxes in the urban canopy were independently estimated correctly by the photon tracking method based on the Monte Carlo method. When a fraction of an area covered with the buildings (eta) increased or the urban canopy height (h_c) became high, it was found that the shortwave radiation flux which the ground surface receives at the daytime decreases, and the long wave radiation flux emitted to the sky decreases at the night time. Next, the heat budget equation model on the building and ground surface, and one dimensional atmospheric boundary layr model were combined, and the temperature and the wind velocity distribution in the urban canopy were predicted. When eta increased or h_c became high, the wind velocity in the urban canopy decreased, and the potential temperature rise at the daytime became small and the potential temperature fall at the night time became also small. It became clear by these results that the increase of eta and the rise of h_c are one of the causes of the heat island phenomenon.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 定道 生, 他: "土壌の水分蒸発効率に及ぼす粒径組成と含水率の影響" 第50回土木学会年次学術講演会講演集. 72-73 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A, Kondo et al.: "Development of Urban Canpy Model and its Sensitivity Analysis" Technology Report of the Osaka University. 46. 245-254 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 近藤 明, 他: "都市キャノピを考慮した大気境界層のシミュレーション" 第9回計算力学講演会講演論文集. 225-226 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A, Kondo et al.: "Development of Atmospheric Boundary model including Urban Canopy" Klimaanalysefuer die Stadplonuing-Second Japanes German meeting-. 203-212 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 田村 直道, 他: "都市キャノピを考慮した大気境界層モデルの開発" 第11回数値流体シンポジウム講演論文集. 275-276 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 堀部 光昭, 他: "土壌から大気への熱・水分輸送モデルへ適用する水理パラメーターの検討" 空気・調和・衛生工学近畿支部学術研究発表会. 43-46 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Kondo, K.Yamaguchi, N.Tamura and S.D.Lee: "Development of Urban Canopy Model and its Sensitivity Analysis" Technology Report of the Osaka University. 46. 245-254 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Kondo, K.Yamaguchi, N.Tamura: "Depelovement of Atmospheric Boundary Model Including Urban Canopy" Klimaanalyze fuer die Stadplanumy-Second Japanese-German Meeting-. 203-212 (1997)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-16  

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