Modeling dense pyroclastic basal flows from collapsing columns
نویسندگان
چکیده
منابع مشابه
Slow-moving and far-travelled dense pyroclastic flows during the Peach Spring super-eruption
Explosive volcanic super-eruptions of several hundred cubic kilometres or more generate long run-out pyroclastic density currents the dynamics of which are poorly understood and controversial. Deposits of one such event in the southwestern USA, the 18.8 Ma Peach Spring Tuff, were formed by pyroclastic flows that travelled >170 km from the eruptive centre and entrained blocks up to ∼ 70-90 cm di...
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[1] Abrasion and comminution of pumice clasts during the propagation of pyroclastic flows have long been recognized as a potential source for the enhanced production of volcanic ash, however, their relative importance has eluded quantification. The amount of ash produced in situ can potentially affect runout distance, deposit sorting, the volume of ash introduced in the upper atmosphere, and in...
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The classical two-phase flow model of Baer and Nunziato is generalized to a thermody-namic consistent multi-component model in multi dimensions. The extended model allowsto deal with phase transitions where exchange processes are modeled by relaxation terms.In particular, chemical relaxation is based on chemical potentials instead of Gibbs freeenergies. New procedures to det...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2008
ISSN: 0094-8276
DOI: 10.1029/2007gl032585