Highlights • We study the collapse conditions using a 1D model with grain-size distribution (GSD). • Combined effects of gas entrapment and variable entrainment favor column collapse. • This drastic effect is reduced when accounting for open porosity in the model. • We predict GSD in pyroclastic flows as a function of GSD and MDR at the vent. • We test the model against the historical 186 CE Taupo and 79 CE Vesuvius eruptions.
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