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Motion, debris size and scale of debris flows in a valley on Mount Yakedake, Japan

Motion, debris size and scale of debris flows in a valley on Mount Yakedake, Japan,H. SUWA,K. OKUNISHI,M. SAKAI

Motion, debris size and scale of debris flows in a valley on Mount Yakedake, Japan   (Citations: 2)
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Horizontal velocity profile, concentration of gravel and gravel-size distribution were obtained from the visual data of debris flow at a field observation site of the Kamikamihori valley on the eastern slope of Mount Yakedake, in order to make clear the flow feature and the size characteristics of gravel in the flow. Three typical surface-velocity distributions, one with a plug in the central part, a smooth one with a horizontal shear, and a highly turbulent one, were found in the flows. The mobility factor defined as the ratio of surface velocity to friction velocity of the flow, was dependent on the concentration of gravel with a negative correlation coefficient. In the case of a successive occurrence of debris-flow surge, concentration of gravel in the frontal part of the later surge was lower. There was a close correlation between size characteristics of gravel and scale of the flow. and the largest size of boulder in the flow was nearly equal to the maximum of the flow depth.
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