publication . Article . 2017

Experiments on mixing in pyroclastic density currents generated from short-lived volcanic explosions

Diana Sher; Andrew W. Woods;
Closed Access English
  • Published: 14 Apr 2017
  • Publisher: Elsevier
Abstract
During short lived volcanic eruptions, dilute, turbulent pyroclastic density currents are often observed to spread laterally from a collapsing fountain. These flows entrain and heat air while also sedimenting particles. Both processes lead to a reduction in the bulk density and since these flows often become vertically stratified, the upper part of the flow may then exhibit a reversal in buoyancy and lift off. The relative importance of entrainment and sedimentation in controlling the lift-off and the associated run-out distance of short-lived flows is not well-understood. We report a series of novel analogue laboratory experiments in which a suspension of dense...
Subjects
free text keywords: sub-05, Flow (psychology), Sedimentation, Flume, Geology, Lift (force), Turbulence, Pyroclastic rock, Geophysics, Buoyancy, engineering.material, engineering, Entrainment (chronobiology)
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