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2004 Fiscal Year Final Research Report Summary

Study on improvements of cloud microphysics modeling and control of artificial cloud generation in the huge vertical shaft

Research Project

Project/Area Number 14350270
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 水工水理学
Research InstitutionCHUO UNIVERSITY

Principal Investigator

YAMADA Tadashi  Chuo University, Faculty of Science and Engineering, Professor, 理工学部, 教授 (80111665)

Co-Investigator(Kenkyū-buntansha) KASHIYAMA Kazuo  Chuo University, Faculty of Science and Engineering, Professor, 理工学部, 教授 (10194721)
HIRANO Hirokazu  Chuo University, Faculty of Policy Studies, Professor, 総合政策学部, 教授 (80256023)
FUJIYOSHI Yasushi  Hokkaido University, Institute of Low Temperature Science, Professor, 工学部, 教授 (40142749)
OHTA Schio  Hokkaido University, Faculty of Engineering, Professor, 工学部, 教授 (00100058)
FUJITA Mutsuhiro  Hokkaido University, Faculty of Engineering, Professor (80001139)
Project Period (FY) 2002 – 2004
KeywordsAerosol / Experiment of cloud microphysics / Cloud microphysics model / Updraft velocity / Artificial rainfall / Numerical simulation / Chemical composition / Condensation growth
Research Abstract

Actual scale experiment of cloud microphysics in mine was carried out. This study aims at revealing cloud microphysical mechanism of generation and development processes of cloud and rainfall. In this experiments, large size fan which generate updraft was placed on the top of vertical shaft and clouds are generated artifitially by controlled updraft. Moreover, several kinds of solution are sprayed at the bottom of vertical shaft. This make it possible to controll chemical composition, solution consistency and number density of aerosol flowing into the vertical shaft. Experiment result such as vatiation of meteorological elements with height and changes in air condition at phase change from vapor to cloud particle could have been obtained. Those experimental data have compared with simulation results by newly developing rainfall simulation model by our research group, which consider effects of aerosol in the air.Following results have been obtained by experiment during reserach period.
1 … More .Experiment controlling inflow air (auch as aerosol number denisty, velocity of updraft) into vertical shaft :
(1)Vertical dsitribution of aerosol number density were measured. Increase of number densityaround elevation of cloud base are observed. Additionally, condensational growthing process of cloud particle as those flow up in vertical shaft were observed. (2)In case of spraying solution at the bottom of vertical shaft, the number of particles with small diameter increase at the top of shaft, meanwhile the number of particles with large diameter decrease. (3)As aerosol number density spraied at the bottom increase, amount of generated cloud water also increase. However, if number denisty of aerosol is too much, amount of generated cloud water intends to converge to constant value. (4)Amount of cloud water increase as updraft velocity is high. Then relations between amount of cloud water and updraft velocity is linear.
2.Temperature distribution in vertical shaft are different before and after generation of cloud. Temperature lapse rate at elevations higher than cloud base is smaller that saturated-adiabatic lapse rate after cloud generation. This measurement result could not be duplicated by existing simulation model. On the other hand, this phenomena could be duplicated by our newly developed simulation model considering effect of aerosol. Less

  • Research Products

    (12 results)

All 2004 2003

All Journal Article (12 results)

  • [Journal Article] Idealized Simulation of Orographic Rainfall with a Mesoscale Atmospheric Model2004

    • Author(s)
      Assela Pathirana
    • Journal Title

      水工学論文集 Vol.48

      Pages: 165-176

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 実スケール雲物理実験による上昇風が降雨形成に及ぼす影響に関する研究2004

    • Author(s)
      土屋 修一
    • Journal Title

      水文・水資源学会 2004年研究発表会要旨集

      Pages: 116-117

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 実スケール雲物理実験による上昇風がエアロゾル粒子の凝結成長に及ぼす影響2004

    • Author(s)
      土屋 修一
    • Journal Title

      第59回土木学会年次学術講演会講演概要集 2-005(CD-ROM)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Idealized Simulation of Orographic Rainfall with a Mesoscale Atmospheric Model2004

    • Author(s)
      Assela Pathirana
    • Journal Title

      Annual Journal of Hydraulic Engineering, JSCE Vol.48

      Pages: 165-176

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Effects of Updraft Velocity against Generation Processes of Rainfall using Actural Scale Cloud Microphysics Experiment2004

    • Author(s)
      Shuichi Tsuchiya
    • Journal Title

      Proceeding of 2004 Annual Conference, Japan Society of Hydrology and Water Resources

      Pages: 116-117

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Effects of Updraft velocity against Condensational Growth of a Arosol Particle using Actural Scale Cloud Microphysics Experiment2004

    • Author(s)
      Shuichi Tsuchiya
    • Journal Title

      Annual Conference of JSCE, Japan Society of Civil Engineering II-005(CD-ROM)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Idealized Simulation of Airflow over a Mountain Ridge Using a Mesoscale Atmospheric Model2003

    • Author(s)
      Assela Pathirana
    • Journal Title

      水工学論文集 Vol.47

      Pages: 31-36

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 降雨の時間特性に関する研究2003

    • Author(s)
      土屋 修一
    • Journal Title

      水工学論文集 Vol.47

      Pages: 139-144

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Rainfall Associated with Mountain-Flow -an Idealized Study2003

    • Author(s)
      Assela Pathirana
    • Journal Title

      水文・水資源学会 2003年研究発表会要旨集

      Pages: 116-117

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Idealized Simulation of Airflow over a Mountain Ridge Using a Mesoscale Atmospheric Model2003

    • Author(s)
      Assela Pathirana
    • Journal Title

      Annual Journal of Hydraulic Engineering JSCE Vol.47

      Pages: 31-36

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Studies on Temporal characteristics of Rainfall2003

    • Author(s)
      Shuichi Tsuchiya
    • Journal Title

      Annual Journal of Hydraulic Engineering JSCE Vol.47

      Pages: 139-144

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Rainfall Associated with Mountain-Flow -an Idealized Study2003

    • Author(s)
      Assela Pathirana
    • Journal Title

      Proceeding of 2003 Annual Conference, Japan Society of Hydrology and Water Resources

      Pages: 116-117

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

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Published: 2007-12-13  

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