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2006 Fiscal Year Final Research Report Summary

Geographical research on the relationship between the occurrence of short-duration heavy rainfall and the spatial structure of surface property in the Tokyo metropolitan area

Research Project

Project/Area Number 16500644
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geography
Research InstitutionTokyo Gakugei University

Principal Investigator

TAKAHASHI Hideo  Tokyo Gakugei University, Faculty of Education, Associate Professor, 教育学部, 助教授 (40202155)

Co-Investigator(Kenkyū-buntansha) NAKMURA Yasuko  Tokyo Gakugei University, Faculty of Education, Assistant Professor, 教育学部, 講師 (20293003)
Project Period (FY) 2004 – 2006
KeywordsTokyo Metropolitan area / Short-duration heavy rainfall / Surface roughness / Building / Aerodynamic parameter / Sky view factor / Urban heat island / Convergence
Research Abstract

In this research, relationships between the occurrence of summertime short-duration heavy rainfall and the urban surface structure in the Tokyo metropolitan area were analyzed in terms of climatology and urban morphology. The results can be summarized as follows :
1. The heavy rainfall area in the northern-western and southern area of central Tokyo tends to develop in its neighborhood during a short period, which indicates the characteristic feature of heavy rainfall in the urban area of Tokyo.
2. Local-scale differences in the occurrence frequency of heavy rainfall are distinct in the Tokyo ward area. The frequent heavy rainfall areas are found in the western and northern part of the Tokyo ward area. Heavy rainfall in former and latter areas tends to occur corresponding to easterly and southerly wind, respectively. These areas are located in the leeward of high-rise buildings such as Shinjuku and Ikebukuro. It is suggested that convergence of surface wind due to large surface roughness enhances the convective activity in the urban area.
3. The calculation method of sky view factor (SVF) by using digital surface model (DSM) was introduced, and the calculation of SVF over the Tokyo ward area was conducted. As the spatial representativeness of SVF at a given point is scarce, scale-up of SVF is required for the discussion on the relationship between urban heat island and SVF. The typical SVFs in the Tokyo ward area are estimated from SVF histogram of 1km×1km areas.
4. The aerodynamic parameters in the Tokyo ward area were computed by using DSM, and horizontal/vertical wind velocity distribution was evaluated. Large ascending wind appears Shinjuku-Meguro, Ikebukuro, etc., and the areas of ascending wind vary with wind directions. It is concluded that the local-scale differences in the occurrence frequency of heavy rainfall is strongly related to the surface roughness which high-rise buildings forms.

  • Research Products

    (8 results)

All 2007 2005

All Journal Article (8 results)

  • [Journal Article] 夏季の都心部における降水強度と気温場および地上風系場2007

    • Author(s)
      澤田康徳, 高橋日出男
    • Journal Title

      地理学評論 80・2

      Pages: 70-86

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Relationship among the rainfall intensity of convective rainfall at central Tokyo and the distribution of surface temperature and wind system over the Kanto Plain in summer2007

    • Author(s)
      Sawada, Y., Takahashi, H.
    • Journal Title

      Geographical Review of Japan 80-2

      Pages: 70-86

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 関東地方における夏季強雨頻度の年々変化2005

    • Author(s)
      澤田康徳, 高橋日出男
    • Journal Title

      東京学芸大学紀要第3部門社会科学 56

      Pages: 65-71

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 画像処理ソフトウエアを利用した地形図からの主題図作成2005

    • Author(s)
      中村康子
    • Journal Title

      学芸地理 60

      Pages: 33-43

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 日本における豪雨の気候と機構 -地域性と時間スケール-2005

    • Author(s)
      高橋日出男
    • Journal Title

      学芸地理 30

      Pages: 44-57

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Year-to-Year Variability in Heavy Precipitation Frequency over Kanto District in Summer Season2005

    • Author(s)
      Sawada, Y., Takahashi, H.
    • Journal Title

      Bulletin of Tokyo Gakugei University Section III, 56

      Pages: 65-71

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Thematic map-making from topographic map with image processing software2005

    • Author(s)
      Nakamura, Y.
    • Journal Title

      The Journal of Geography (The Gakugei Chiri) 80

      Pages: 33-43

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Climatology and characteristic feature of heavy rainfall in Japan : Spatial structure and time scale2005

    • Author(s)
      Takahashi, H.
    • Journal Title

      The Journal of Geography (The Gakugei Chiri) 80

      Pages: 44-57

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

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Published: 2008-05-27  

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