A STUDY ON TURBULENT FLUX IN AN URBAN AND RURAL AREA BASED ON A FIELD MEASUREMENT

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  • TANIMOTO Jun
    Department of Energy and Environmental Engineering, Interdisciplinary Graduate School of Engineering Sciences, Kyushu Univ.
  • KATAYAMA Tadahisa
    Department of Energy and Environmental Engineering, Interdisciplinary Graduate School of Engineering Sciences, Kyushu Univ.
  • HAYASHI Tetsuo
    Department of Energy and Environmental Engineering, Interdisciplinary Graduate School of Engineering Sciences, Kyushu Univ.
  • KATATA Natsuko
    Asia Air Survey Co. Ltd.
  • HAGISHIMA Aya
    Department of Energy and Environmental Engineering, Interdisciplinary Graduate School of Engineering Sciences, Kyushu Univ.

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Other Title
  • 屋外観測に基づく都市内外における乱流輸送量に関する研究
  • オクガイ カンソク ニ モトズク トシ ナイガイ ニ オケル ランリュウ ユソ

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Abstract

To grasp significant air temperature rising in urban areas, so-called Heat Island, a series of field measurements were carried out. In the measurements turbulent fluxes were mainly observed based on the Eddy Correlation Method with net radiation rate and other fundamental meteorological elements. Those were acquired in both urban and suburban data stations built up on a penthouse simultaneously and sequentially during typical summer days in 1997. In urban area much sensible heat fluxes were observed compared with suburban data. A significant relationship between latent heat flux and precipitation was confirmed. Results of time series analysis and the influences of anthropogenic heat generation on the sensible heat flux were discussed. The assumption of Monin-Obukhov Similarity was validated using obtained data, which is not exactly appropriate in the urban area.

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