The analysis of the influence of pumice shape on its terminal velocity
Por:
Dellino P., Mele D., Bonasia R., Braia G., La Volpe L., Sulpizio R.
Publicada:
1 ene 2005
Resumen:
Pumice particles represent the basic "ingredient" of many large explosive eruptions and form as a result of magma fragmentation inside the conduit. At the onset of eruption, fragmental pumices are expelled at high velocity from the crater by the overpressure of gas liberated on explosion. The resulting multiphase flow is forced through atmosphere by a variety of transportation mechanisms and pumices eventually decouple from the gas flow, settling down to form pyroclastic deposits. Here we propose new experimental data of terminal velocity together with a quantitative shape analysis of a wide range of pumice particles. The resulting model allows predicting the terminal velocity of pumice by means of easily measured particle characteristics, with an average error of 12%, which compares favourably with previous models. Copyright 2005 by the American Geophysical Union.
Filiaciones:
Dellino P.:
Dipartimento Geomineralogico, Università di Bari, Via Orabona 4, I-70124 Bari, Italy
Centro Interdipartimentale per il Rischio Sismico e Vulcanico, Università di Bari, Bari, Italy
Mele D.:
Dipartimento Geomineralogico, Università di Bari, Via Orabona 4, I-70124 Bari, Italy
Bonasia R.:
Dipartimento Geomineralogico, Università di Bari, Via Orabona 4, I-70124 Bari, Italy
Braia G.:
Dipartimento Geomineralogico, Università di Bari, Via Orabona 4, I-70124 Bari, Italy
La Volpe L.:
Dipartimento Geomineralogico, Università di Bari, Via Orabona 4, I-70124 Bari, Italy
Centro Interdipartimentale per il Rischio Sismico e Vulcanico, Università di Bari, Bari, Italy
Sulpizio R.:
Dipartimento Geomineralogico, Università di Bari, Via Orabona 4, I-70124 Bari, Italy
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