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Título: | Aerodynamics of stratovolcanoes during multiphase processes |
Autor: | Doronzo, Domenico Maria CSIC ORCID ; Martí Molist, Joan CSIC ORCID ; Sulpizio, Roberto; Dellino, Pierfrancesco | Palabras clave: | Aerodynamics boundary layer pyroclastic density current stratovolcano wake region |
Fecha de publicación: | 2012 | Editor: | American Geophysical Union | Citación: | Journal of Geophysical Research 117 (2012) | Resumen: | Pyroclastic density currents (PDCs) are gas-particle flows generated during explosive eruptions, which are often erupted over the flanks of stratovolcanoes. These volcanoes may have different shapes, which can affect the flow aerodynamics and hence the depositional processes. Here, multiphase numerical simulations are carried out in order to define semiquantitative relationships among the PDC behavior, particle response, and deposit formation. Three stratovolcano shapes are used: straight, convex and concave, and, by means of numerical simulations, their effects both on the flow structure and depositional processes are highlighted. The current starts moving as a homogeneous flow, and then it rapidly evolves to a turbulent boundary layer moving in contact with the ground, overlaid by a companion wake region. Results show that thin boundary layers produce thick deposits of massive layers, whereas thick boundary layers produce thin laminated deposits. Moreover, concave wake regions would produce thick massive deposits of fine ash, whereas convex wake regions would produce thin ash deposits. Copyright 2012 by the American Geophysical Union. | Versión del editor: | hppt://dx.doi.org/10.1029/2011JB008769 | URI: | http://hdl.handle.net/10261/77279 | DOI: | 10.1029/2011JB008769 | Identificadores: | doi: 10.1029/2011JB008769 issn: 0148-0227 |
Aparece en las colecciones: | (Geo3Bcn) Artículos |
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Marti JGRB 2012 117 b01207.pdf | 691,98 kB | Adobe PDF | Visualizar/Abrir |
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