A two-layer approach to modelling the transformation of dilute pyroclastic currents into dense pyroclastic flows
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- Emma E. Doyle
- Joint Centre for Disaster Research, Massey University, PO Box 756, Wellington 6140, New Zealand
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- Andrew J. Hogg
- School of Mathematics, University of Bristol, University Walk, Bristol BS8 1TW, UK
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- Heidy M. Mader
- Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen’s Road, Bristol BS8 1RJ, UK
書誌事項
- 公開日
- 2010-11-17
- 権利情報
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- https://royalsociety.org/journals/ethics-policies/data-sharing-mining/
- DOI
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- 10.1098/rspa.2010.0402
- 公開者
- The Royal Society
この論文をさがす
説明
<jats:p>Most models of volcanic ash flows assume that the flow is either dilute or dense, with dynamics dominated by fluid turbulence or particle collisions, respectively. However, most naturally occurring flows feature both of these end members. To this end, a two-layer model for the formation of dense pyroclastic basal flows from dilute, collapsing volcanic eruption columns is presented. Depth-averaged, constant temperature, continuum conservation equations to describe the collapsing dilute current are derived. A dense basal flow is then considered to form at the base of this current owing to sedimentation of particles and is modelled as a granular avalanche of constant density. We present results which show that the two-layer model can predict much larger maximum runouts than would be expected from single-layer models, based on either dilute or dense conditions, as the dilute surge can outrun the dense granular flow, or vice versa, depending on conditions.</jats:p>
収録刊行物
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- Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
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Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 467 (2129), 1348-1371, 2010-11-17
The Royal Society
