Author(s): Takashi Yamada; Yoshiharu Ishikawa; Shigemi Yajima
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Abstract: In order to understand the flow mechanism of pyroclastic flows which is little known, we studied the kinetic characteristics of the small-scale pyroclastic flows of Unzen Volcano in 1991 making VTR analysis. Characteristics of the main bodies and the hot ash cloud behavior, the relationship between the gradient of slope and the flow velocity, the coefficient of velocity of the main bodies were cleared to some extent. We could get some basical information concerning hot ash cloud concentration, and its density which is necessary to think of the dynamic model of it.
Year: 1993