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Numerical study of dynamics of pyroclastic flows using shallow-water and eruption-cloud models

Research Project

Project/Area Number 17H02949
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Solid earth and planetary physics
Research InstitutionThe University of Tokyo

Principal Investigator

Koyaguchi Takehiro  東京大学, 地震研究所, 教授 (80178384)

Co-Investigator(Kenkyū-buntansha) 鈴木 雄治郎  東京大学, 地震研究所, 准教授 (30392939)
Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Fiscal Year 2018: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords火砕流 / 数値計算 / 浅水波モデル / 流体力学 / 重力流
Outline of Final Research Achievements

During explosive volcanic eruptions, a mixture of pyroclasts and gas is ejected from the volcanic vent, and can flow on the ground surface as a pyroclastic density current (PDC). PDCs are generally stratified with respect to particle concentration and are composed of two layers: the upper dilute layer and the lower dense layer. The dynamics of these two layers are controlled by various physical processes with different length scales. The upper dilute layer is affected by particle settling, thermal expansion of entrained air, and resistance at the flow front, whereas the lower dense layer is controlled by friction, deposition, and erosion at the base.
We developed a two-layer PDC model where an eruption-cloud model is applied to the upper dilute layer and a depth-averaged model to the lower dense layer. The new model enables us to investigate the complex effects of volcanological factors (e.g., topographic effects as well as eruption conditions) on the run-out distances of PDCs.

Academic Significance and Societal Importance of the Research Achievements

火山噴火で発生する火砕流のダイナミクスについては,最大到達距離の決定要因をはじめとする,学術上・防災上重要な基本的問題が解明されていない.これらの基本的問題が解決困難であった理由は,火砕流のダイナミクスが大気の取り込みや堆積作用など,長さスケールの異なる様々な物理過程の影響を受けることにある.本研究は,長さスケールの異なる現象を同時に扱う数値モデル(「二層浅水波モデル」および「2D浅水波・3D噴煙結合モデル」)を新たに開発し,それらを用いて火砕流の到達距離や堆積物の分布範囲・性質を支配する要因を系統的に調べた点に意義がある.

Report

(5 results)
  • 2021 Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (27 results)

All 2021 2020 2019 2018 2017 Other

All Int'l Joint Research (3 results) Journal Article (7 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 7 results,  Open Access: 7 results) Presentation (17 results) (of which Int'l Joint Research: 11 results,  Invited: 4 results)

  • [Int'l Joint Research] INGV(イタリア)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Massey University(ニュージーランド)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Massey University(ニュージーランド)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Validation of a two-layer depth-averaged model by comparison with an experimental dilute stratified pyroclastic density current2021

    • Author(s)
      Hiroyuki A. Shimizu, Takehiro Koyaguchi, Yujiro J. Suzuki, Ermanno Brosch, Gert Lube, Matteo Cerminara
    • Journal Title

      Bulletin of Volcanology

      Volume: 83 Issue: 11 Pages: 73-73

    • DOI

      10.1007/s00445-021-01493-w

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Control of Vent Geometry on the Fluid Dynamics of Volcanic Plumes: Insights From Numerical Simulations2020

    • Author(s)
      Suzuki Y. J.、Costa A.、Koyaguchi T.
    • Journal Title

      Geophysical Research Letters

      Volume: 47 Issue: 10

    • DOI

      10.1029/2020gl087038

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The run-out distance of large-scale pyroclastic density currents: A two-layer depth-averaged model2019

    • Author(s)
      Shimizu Hiroyuki A.、Koyaguchi Takehiro、Suzuki Yujiro J.
    • Journal Title

      Journal of Volcanology and Geothermal Research

      Volume: 381 Pages: 168-184

    • DOI

      10.1016/j.jvolgeores.2019.03.013

    • Related Report
      2019 Annual Research Report 2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Understanding the plume dynamics of explosive super-eruptions2018

    • Author(s)
      Costa Antonio、J. Suzuki Yujiro、Koyaguchi Takehiro
    • Journal Title

      Nature Communications

      Volume: 9 Issue: 1 Pages: 654-654

    • DOI

      10.1038/s41467-018-02901-0

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The Condition of Eruption Column Collapse: 1. A Reference Model Based on Analytical Solutions2018

    • Author(s)
      Koyaguchi Takehiro、Suzuki Yujiro J.
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 123 Issue: 9 Pages: 7461-7482

    • DOI

      10.1029/2017jb015308

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The Condition of Eruption Column Collapse: 2. Three-Dimensional Numerical Simulations of Eruption Column Dynamics2018

    • Author(s)
      Koyaguchi Takehiro、Suzuki Yujiro J.、Takeda Kai、Inagawa Satoshi
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 123 Issue: 9 Pages: 7483-7508

    • DOI

      10.1029/2017jb015259

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A numerical shallow-water model for gravity currents for a wide range of density differences2017

    • Author(s)
      Shimizu Hiroyuki A.、Koyaguchi Takehiro、Suzuki Yujiro J.
    • Journal Title

      Progress in Earth and Planetary Science

      Volume: 4 Issue: 1 Pages: 8-8

    • DOI

      10.1186/s40645-017-0120-2

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] An analysis of sedimentation processes in pyroclastic density currents based on a two-layer depth-averaged model2021

    • Author(s)
      Hiroyuki A. Shimizu, Takehiro Koyaguchi, Yujiro J. Suzuki
    • Organizer
      日本地球惑星科学連合大会(JpGU)
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] マグマ噴火・マグマ水蒸気噴火による大規模火砕流の到達距離: 二層重力流モデルによる数値シミュレーション2021

    • Author(s)
      志水宏行・小屋口剛博・鈴木雄治郎
    • Organizer
      日本地球惑星科学連合大会(JpGU)
    • Related Report
      2020 Annual Research Report
  • [Presentation] 重力流の浅水流理論と実験に基づく火砕流ダイナミクスの二層数値モデルの開発2021

    • Author(s)
      志水宏行・小屋口剛博・鈴木雄治郎
    • Organizer
      分野横断型研究集会「地球表層における重力流のダイナミクス」
    • Related Report
      2020 Annual Research Report
  • [Presentation] 3D numerical simulations of volcanic jets inside a crater during explosive volcanic eruptions2020

    • Author(s)
      Fiodar Perakhozhau, Takehiro Koyaguchi
    • Organizer
      日本地球惑星科学連合大会(JpGU-AGU joint meeting)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Experimental validation of a two-layer model for pyroclastic density currents2020

    • Author(s)
      Hiroyuki A. Shimizu, Takehiro Koyaguchi, Yujiro J. Suzuki, Ermanno Brosch, Gert Lube
    • Organizer
      日本地球惑星科学連合大会(JpGU-AGU joint meeting)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The run-out distance of a two-layer model for large-scale pyroclastic density currents2019

    • Author(s)
      Hiroyuki A. Shimizu, Takehiro Koyaguchi, Yujiro J. Suzuki
    • Organizer
      AGU Fall meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Simulating dynamics of explosive very large eruptions2019

    • Author(s)
      Yujiro J. Suzuki, Antonio Costa, Takehiro Koyaguchi
    • Organizer
      IUGG General Assembly
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 観測データと物理モデルに基づく火山噴火推移予測の可能性2019

    • Author(s)
      小屋口剛博,石井憲介,K. Anderson,小園誠史
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 大規模火砕流の到達距離に対する温度の影響: 二層重力流モデルによる数値シミュレーション2019

    • Author(s)
      志水宏行, 小屋口剛博, 鈴木雄治郎
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] The control of vent geometry on the dynamics of volcanic plumes2019

    • Author(s)
      Yujiro J. Suzuki, Antonio Costa, Takehiro Koyaguchi
    • Organizer
      EGU meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A two-layer depth-averaged model of pyroclastic density currents: 1. Laboratory-scale flows2019

    • Author(s)
      Hiroyuki A. Shimizu, Takehiro Koyaguchi, Yujiro J. Suzuki
    • Organizer
      PDC transport dynamics workshop: Benchmarking numerical models and future avenues
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] A two-layer depth-averaged model of pyroclastic density currents: 2. Large-scale natural flows2019

    • Author(s)
      Hiroyuki A. Shimizu, Takehiro Koyaguchi, Yujiro J. Suzuki
    • Organizer
      PDC transport dynamics workshop: Benchmarking numerical models and future avenues
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A two-layer depth-averaged model of pyroclastic density currents: 1. Laboratory-scale flows2019

    • Author(s)
      Hiroyuki A. Shimizu, Takehiro Koyaguchi, Yujiro J. Suzuki
    • Organizer
      PDC transport dynamics - Benchmarking numerical models and future avenues
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A two-layer depth-averaged model of pyroclastic density currents: 2. Large-scale natural flows2019

    • Author(s)
      Hiroyuki A. Shimizu, Takehiro Koyaguchi, Yujiro J. Suzuki
    • Organizer
      PDC transport dynamics - Benchmarking numerical models and future avenues
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 二層浅水波モデルに基づく火砕流ダイナミクスの数値的研究: 流れの形態と堆積構造の変化2018

    • Author(s)
      志水宏行, 小屋口剛博, 鈴木雄治郎
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Numerical simulations of a two-layer shallow-water model for pyroclastic density current2017

    • Author(s)
      Hiroyuki A. Shimizu, Takehiro Koyaguchi, Yujiro J. Suzuki
    • Organizer
      JpGU-AGU Joint Meeting
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Fluid dynamics of very large plumes generated by explosive super-eruptions2017

    • Author(s)
      Yujiro Suzuki, Antonio Costa, Takehiro Koyaguchi
    • Organizer
      JpGU-AGU Joint Meeting
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research

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Published: 2017-04-28   Modified: 2023-01-30  

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