2021年10月
Validation of a two-layer depth-averaged model by comparison with an experimental dilute stratified pyroclastic density current
Bulletin of Volcanology
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- 巻
- 83
- 号
- 11
- 開始ページ
- 73
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1007/s00445-021-01493-w
- 出版者・発行元
- Springer
Numerical results of a two-layer depth-averaged model of pyroclastic density currents (PDCs) were compared with an experimental PDC generated at the international eruption simulator facility (the Pyroclastic flow Eruption Large-scale Experiment (PELE)) to establish a minimal dynamical model of PDCs with stratification of particle concentrations. In the present two-layer model, the stratification in PDCs is modeled as a voluminous suspended-load layer with low particle volume fractions (≲10^(−3)) and a thin basal bed-load layer with higher particle volume fractions (∼10^(−2)) on the basis of the source condition in the experiment. Numerical results for the suspended load quantitatively reproduce the time evolutions of the front position and flow thickness in the experimental PDC. The numerical results of the bed-load and deposit thicknesses depend on an assumed value of settling speed at the bottom of the bed load (W_sH). We show that the thicknesses of bed load and deposit in the simulations agree well with the experimental data, when W_sH is set to about 1.25×10^(−2) m/s. This value of the settling speed is two orders of magnitude smaller than that predicted by a hindered-settling model. The small value of W_sH is considered to result from decreasing in the effective deposition speed due to the erosion process accompanied by saltating/rolling of particles at the bottom of the bed load.
- リンク情報
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- DOI
- https://doi.org/10.1007/s00445-021-01493-w 本文へのリンクあり
- 共同研究・競争的資金等の研究課題
- マグマ噴火・マグマ水蒸気噴火で生じる大規模火砕流の到達距離に関する数値的研究
- URL
- https://link.springer.com/article/10.1007/s00445-021-01493-w 本文へのリンクあり
- URL
- https://link.springer.com/journal/445/topicalCollection/AC_656392f88370ce4c2ae87cec2da1c6d0/page/1 本文へのリンクあり
- Scopus
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85117565520&origin=inward 本文へのリンクあり
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85117565520&origin=inward
- ID情報
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- DOI : 10.1007/s00445-021-01493-w
- ISSN : 0258-8900
- eISSN : 1432-0819
- SCOPUS ID : 85117565520