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Experiments on deaerating granular flows and implications for pyroclastic flow mobility

Abstract : Granular flows were generated by the release of beds of particles in various fluidized states, which then deaerated in a horizontal channel. We describe characteristics of the flows and their deposits. Morphological similarities between deposits in experiments and in the field suggest that pyroclastic flow deposits form from a fluidized mixture. The experiments show that slightly expanded, fluidized flows are more mobile than non-fluidized flows of equivalent volume and material composition. They travel to a fixed distance from their source, which depends only weakly on their initial degree of fluidization. Flows of fine particles (<100 mm) deaerate slowly and are highly mobile. Pyroclastic flows commonly have large amounts of fine ash, which may have a controlling influence on their high mobility.
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Olivier Roche, M Gilbertson, J Phillips, R Sparks. Experiments on deaerating granular flows and implications for pyroclastic flow mobility. Geophysical Research Letters, American Geophysical Union, 2002, 29 (16), pp.40-1-40-4. ⟨10.1029/2002gl014819⟩. ⟨hal-03031507⟩



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