SHEAR FUNCTIONS OF WIND AND TEMPERATURE IN AN URBAN SURFACE LAYER

DOI
  • MORIWAKI Ryo
    東京工業大学理工学研究科土木工学専攻
  • KANDA Manabu
    東京工業大学理工学研究科国際開発工学専攻
  • KIMOTO Yuka
    東京工業大学理工学研究科国際開発工学専攻

Bibliographic Information

Other Title
  • 都市境界層における風速・温度のシアー関数

Abstract

We investigate shear functions for momentum (φM-1) and heat (φH-1) and linear correlation coefficients of them (-ruw |rwT|) using data acquired over an urban surface layer in Tokyo Japan. Field measurement was conducted on a 29m height tower, 4 times the canopy height of 7.3m. 3D sonic anemometers were installed at 4 heights in the region 1.5zh<z<4zh and fine wire thermocouples were mounted at 10 heights from the ground to the top. Main conclusions were obtained as follows.(1) Momentum flux decreases with height. Non-dimensional horizontal wind velocity follows a conventional stratified logarithmic profile when it is scaled by the shear stress extrapolated to the roof top level. However, the locally scaled wind profile fails the agreement.(2) Both of φM-1 and -ruw have the dependency on height and they are enhanced near the canopy due to the ‘bluff body’ effect.(3) At a height of z/zh =2.7, φM-1 follows the conventional similarity function while -ruw is still larger than a conventional one. The ‘bluff body’ effect appears more significantly in -ruw.(4) Both of ΦH-1 and |rwT| have a good agreement with the conventional function and the dependencies on height are not found. In the case of heat, the conventional similarity theory can be applied to the urban surface layer.

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Details 詳細情報について

  • CRID
    1390001205170965248
  • NII Article ID
    130004043539
  • DOI
    10.2208/prohe.48.139
  • ISSN
    18849172
    09167374
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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