Results 171 to 180 of about 1,257 (218)

Particle size-density relationships in pyroclastic deposits: inferences for emplacement processes

Bulletin of Volcanology, 2002
In moving pyroclastic systems, particles are sorted as a function of their sizes, densities and shapes. The analysis of the distribution of these characteristics in particle populations of pyroclastic deposits is a major tool in evaluating properties and
Jacopo Taddeucci, Danilo M Palladino, Taddeucci Jacopo   +2 more
exaly   +2 more sources

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Pyroclastic density currents: state of the art and perspectives

Journal of Volcanology and Geothermal Research, 2014
Pyroclastic density currents (PDCs) are mixtures of two components, namely solid particles and fluid (gas) phase. They macroscopically behave as dense, multiphase gravity currents (flowing pyroclastic mixtures of particles and gas) immersed in a less dense, almost isotropic fluid (the atmosphere).
Sulpizio R
exaly   +4 more sources

Interaction between pyroclastic density currents and buildings: Numerical simulation and first experiments

Earth and Planetary Science Letters, 2011
The interaction between pyroclastic density currents and buildings is investigated by means of numerical simulation and large-scale experiments. Numerical simulation is performed with the Euler-Lagrange approach using a two-way coupling between gas and ...
Domenico M Doronzo, Pierfrancesco Dellino   +1 more
exaly   +2 more sources

Erosional characteristics and behavior of large pyroclastic density currents

Geology, 2012
Factors influencing the erosive behavior of large pyroclastic density currents (PDCs), both mainly massive and thinly stratified, are not well understood. To investigate the parameters influencing the erosive behavior of PDCs produced during the flowing phase of large, caldera-forming Plinian (Campanian Ignimbrite) and phreatoplinian (Neapolitan Yellow
SCARPATI, CLAUDIO, Perrotta A.
openaire   +4 more sources

Generation of Overspill Pyroclastic Density Currents in Sinuous Channels

Journal of Geophysical Research: Solid Earth, 2021
AbstractDue to their mobility, high velocities, and common occurrence, small‐volume pyroclastic density currents (PDCs) represent a major hazard around volcanoes. Small‐volume events are particularly sensitive to topography and channelization into drainage basins. Understanding the flow transition initiated by avulsion or overspill from valley confined
A. Kubo Hutchison, J. Dufek
openaire   +1 more source

Pyroclastic density currents

Geological Society, London, Special Publications, 1998
Abstract High-speed, gravity-driven flows of hot particles and gas are a common and highly destructive product of explosive volcanism. They range widely in nature from expanded, turbulent suspension currents formed by lateral blasts or by the fountaining of vertical eruption columns, to highly concentrated granular avalanches ...
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The Fluid Mechanics of Pyroclastic Density Currents

Annual Review of Fluid Mechanics, 2016
Pyroclastic density currents are generated in explosive volcanic eruptions when gas and particle mixtures remain denser than the surrounding atmosphere. These mobile currents have a diversity of flow regimes, from energetic granular flows to turbulent suspensions. Given their hazardous nature, much of our understanding of the internal dynamics of these
openaire   +1 more source

Revaluating the Vertical Velocity and Density Structure of Dilute Pyroclastic Density Currents

2023
Dilute pyroclastic density currents (dilute PDCs) are frequent and hazardous volcanic phenomena. Better mitigating against PDC hazards requires understanding of the vertical velocity and density structures inside flows and how these are modified during flow runout, particle sedimentation, air entrainment and buoyancy reversal.
Uhle, D., Ardo, J., Lube, G., Jones, J.
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Effects of flow density on the dynamics of dilute pyroclastic density currents

Journal of Volcanology and Geothermal Research, 2004
Abstract Dilute turbulent pyroclastic density currents may have densities as large as 10–100 kg m −3 . Laboratory experiments using dense gases show that for such currents, the speed of the head of the current depends on the density difference between the current and the surrounding air in a complex way.
Sarah E. Nield, Andrew W. Woods
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Density Stratification and Buoyancy Evolution in Pyroclastic Density Currents

Journal of Geophysical Research: Solid Earth
AbstractPyroclastic density currents (PDCs) are density‐stratified along their vertical axis, with the near‐bed portion being denser than the upper portion, resulting from particle settling and ambient air entrainment at current margins. Whereas vertical density stratification likely influences mixing, sedimentation, and buoyancy of PDCs, many depth ...
Sean B. O’Donnell, Blair A. Johnson, Eric C. P. Breard, James L. Buttles, James E. Gardner, David Mohrig, Josef Dufek   +6 more
openaire   +1 more source