Un the Hora-dani Debris Flow

Abstract

The large scale debris flow that occurred at Hora-dani in Gifu prefectere in August, 1979, gave a good chance to the case study on the mechanism of debris flow. Application of writer's theory to the processes of occurrence, flowage, and deposition fitted rather well in actual phenomena. Thus, the writer's mechanical method for the delineation of debris flow hazardous area was demonstrated as one of the promising approachs.