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Energy transport in the atmospheric boundary layer over the complex ground surface

Research Project

Project/Area Number 61460046
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 気象・海洋・陸水学
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

KONDO Junsei  Geophysical Institute, Tohoku University, 理学部, 教授 (30004493)

Co-Investigator(Kenkyū-buntansha) KUWAGATA Tsuneo  Geophysical Institute, Tohoku University, 理学部, 助手 (90195602)
SATA Takeshi  Geophysical Institute, Tohoku University, 理学部, 助手 (30142920)
萩野谷 成徳  東北大学, 理学部, 助手 (40150255)
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥4,200,000 (Direct Cost: ¥4,200,000)
Fiscal Year 1987: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1986: ¥2,400,000 (Direct Cost: ¥2,400,000)
KeywordsBulk heat transfer coefficient / Canopy flow / Drainage flow / Aerodynamic roughness length / 積雪面粗度 / 抵抗係数 / 複雑地形 / 盆地の気温変化 / 複雑地形の熱収支 / 複雑地表面の粗度 / 斜面流 / 盆地冷却 / 粗度群落の熱交換
Research Abstract

1. Numerical study was made on the bulk heat transfer coefficient for a variety of vegetation types and densities. (1) The bulk transfer coefficients for momentum and heat, Cm and Ch, change with non-dimensional canopy density C*; each has a muximum. (2) The value of Cm is always larger than the value of Ch for a canopy with cm>ch, cm and ch being the drag coefficient and the heat transfer coefficient of an individual canopy element, respectively. (3) The value of C* at which Ch has its maximum value is larger than the value of C* at which Cm has its maximum.
2. Three-dimensional distributions of wind speed and temperature in a V-shaped valley covered with a pasture and scattered shrubs were continuously observed. The vertical profile of potential temperature in the drifted cold layer is represented by a linear function of height.The wind speed below the level of maximum wind does not seriously change with a fetch, but the wind speed in the upper part of the cold layer outstandingly increases with a fetch.
3. The aerodinamic roughness parameter over inhomogeneous ground surfaces, such as cities, rural towns and so on, is determined by analyzing the wind data at AMeDAS observatories in Japan, by making use of Rossby number similarity theory. Ot is founf that the aerodynamic roughness parameter is proportional to the average size of the roughness elements.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] Kondo, J.;T. Sato: Boundary-Layer Meter. 42. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Kondo, J.;S. Haginoya: Boundary-Layer Meteor. 44. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Kondo, J.;A. Kawanaka: Boundary-Layer Meteor. 37. 285-296 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yasuda, N.;J. Kondo;T. Sato: J. Meteor. Soc. Japan. 64. 283-301 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Kondo, J.;H. Yamazawa: Boundary-Layer Meteor. 35. 331-348 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Kondo, J.;H. Yamazawa: Boundary-Layer Meteor. 34. 123-135 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Kondo,J and A,Kawanaka: "Numerical study on the bulktransfer coefficient for a variety of vegetation types and densities." Boundary-Layer Meteor.37. 285-296 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yasuda,N., J,Kondo and T,Sato: "Drainage flow observed in a V-shaped valley." J.Meteor. Soc. Japan. 64. 283-301 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Kondo,J. and H,Yamazawa: "Aerodynamic roughness over an inhomogeneous ground surface." Boundary-Layer Meteor.35. 331-348 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Kondo,J. and T,Sato: "A simple model of drainage flow on a slope" Bundary-Layer Meteor.42. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Kondo,J. and S.Haginoya: "Nocturnal radiation cooling and bulk transfer coefficient over the ground with various covers" Boundary-Layer Meteor.44. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] J.Kondo: Boundary-Layer Meteorol.35. 331-348 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] J.Kondo: Boundary-Layer Mateorol.37. 285-296 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] J.Kondo: J.Atomospheric Sciences. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] N.Yasuda: J.Meteorol.Soc.Japan. 64. 283-301 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] H.Yamazawa: Boundary-Layer Meteorol.(1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] 桑形恒男: 天気. 33. 207-215 (1986)

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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