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Development of a quick atmospheric dispersion calculation method in emergency responses to nuclear accidents

Research Project

Project/Area Number 16K01341
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Natural disaster / Disaster prevention science
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

nakayama hiromasa  国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 原子力基礎工学研究センター, 研究副主幹 (50535903)

Research Collaborator Takemi Tetsuya  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords大気拡散 / 大気乱流 / 原子力緊急時 / 数値シミュレーション / 局所域 / 重合法 / 即時評価 / 局所域大気拡散モデル / 局所域大気拡散 / Large-Eddy Simulation / 温度成層効果 / 数値予測
Outline of Final Research Achievements

We propose, in emergency response to nuclear accidents, a practical and quick local-scale atmospheric dispersion calculation method using an overlapping technique. First, we pre-calculated plume dispersion around an actual nuclear facility under idealized atmospheric conditions with 36 wind-direction cases and made a dataset of mean concentrations for each wind direction case. Then, we conducted LESs of plume dispersion under realistic atmospheric conditions using the meteorological data and estimated the spatial distributions of the 1-hour averaged concentrations by overlapping the precalculated concentration data depending on the frequency of the mean wind directions. It is shown that the concentration distribution patterns are well reproduced in comparison to those under the realistic conditions. It is concluded that the atmospheric dispersion calculation method using the overlapping technique has potentially a high performance in emergency responses to nuclear accidents.

Academic Significance and Societal Importance of the Research Achievements

大気拡散予測手法として、主に、正規分布型プルームモデルと計算流体力学モデルの2つの手法が挙げられる。前者は、簡易拡散方程式に基づく手法であるため、迅速かつ低コストで予測できるが、局所地形や建物の影響を厳密に考慮できないため、正確さに問題がある。一方、後者は地表面起伏や建物の影響を考慮して拡散予測を行えるが、計算負荷は高い。そのため、計算精度を追及すれば計算時間も増大するというトレードオフ問題が生じていた。本研究で開発した手法は、迅速かつ高い精度で拡散予測を行うことができ、従来のトレードオフ問題の概念を覆した画期的な緊急時対応が可能となる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (9 results)

All 2018 2017 2016

All Journal Article (2 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (7 results) (of which Int'l Joint Research: 4 results)

  • [Journal Article] Large-eddy simulation studies for predicting plume concentrations around nuclear facilities using an overlapping technique2018

    • Author(s)
      Takemi Tetsuya、Nakayama Hiromasa
    • Journal Title

      International Journal of Environment and Pollution

      Volume: 64 Issue: 1 Pages: 125-144

    • DOI

      10.1504/ijep.2018.10019970

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] LES studies for predicting plume concentrations around nuclear facilities using an overlapping technique2017

    • Author(s)
      Hiromasa Nakayama, Tetsuya Takemi
    • Journal Title

      Proceedings of 18th International Conference on Harmonisation within Atmospheric Dispersion Modelling

      Volume: - Pages: 843-847

    • Related Report
      2017 Research-status Report
    • Open Access
  • [Presentation] LES analysis of the effect of source height on the longitudinal distribution of plume concentration in the convective boundary layer capped by a temperature inversion2018

    • Author(s)
      Hiromasa Nakayama, Tetsuya Takemi
    • Organizer
      The 5th International Workshop on Nonhydrostatic Models
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] LES studies for predicting plume concentrations around nuclear facilities using an overlapping technique2017

    • Author(s)
      Hiromasa Nakayama, Tetsuya Takemi
    • Organizer
      18th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 現実気象条件下における都市詳細大気拡散計算手法に関する研究2017

    • Author(s)
      中山浩成、竹見哲也
    • Organizer
      日本気象学会2017 年度秋季大会
    • Related Report
      2017 Research-status Report
  • [Presentation] High-resolution numerical simulation of turbulent flows and dry deposition in mountainous forest2017

    • Author(s)
      Hiromasa Nakayama, Genki Katata
    • Organizer
      2017 Symposium on Atmospheric Chemistry and Physics at Mountain Sites
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Large-eddy simulation of plume dispersion in the central district of Oklahoma City by coupling a meso-scale meteorological simulation model2016

    • Author(s)
      Hiromasa Nakayama,Tetsuya Takemi
    • Organizer
      2016 American Geophysical Union Fall Meeting
    • Place of Presentation
      サンフランシスコ
    • Year and Date
      2016-12-12
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] リサイクリング技術を用いたLES温度成層乱流生成手法に関する研究2016

    • Author(s)
      中山浩成,竹見哲也
    • Organizer
      日本気象学会2016年度秋季大会
    • Place of Presentation
      名古屋大学(愛知県名古屋市)
    • Year and Date
      2016-10-26
    • Related Report
      2016 Research-status Report
  • [Presentation] 局所域高分解能大気拡散モデルを用いた森林の乾性沈着分布の詳細評価手法の開発2016

    • Author(s)
      中山浩成,堅田元喜
    • Organizer
      第57 回大気環境学会年会
    • Place of Presentation
      北海道大学(北海道札幌市)
    • Year and Date
      2016-09-07
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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