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The paper addresses some fundamental aspects of the dynamics of dense granular flows down inclines relevant&#13; to pyroclastic density currents. A simple mechanistic framework is presented to analyze the dynamics of the&#13; frontal zone, with a focus on the establishment of conditions that promote air entrainment at the head of the current&#13; and motion-induced self-fluidization of the flow. The one-dimensional momentum balance on the current&#13; along the incline is considered under the hypothesis of strongly turbulent flow and pseudo-homogeneous behaviour&#13; of the two-phase gas-solid flow. Departures from one-dimensional flow in the frontal region are also analyzed&#13; and provide the key to the assessment of air cross-flow and fluidization of the solids in the head of the current.&#13; The conditions for the establishment of steady motion of pyroclastic flows down an incline, in either the&#13; fluidized or «dry» granular states, are examined

Assessment of motion-induced fluidization of dense pyroclastic gravity currents