Author(s): Naoki Miyazawa
Linked Author(s): Naoki Miyazawa
Keywords: Debris flow; Front; Intermittency; Jamming of particles; Failureand remobilization of particles jammed
Abstract: One of the most significant characteristics of debris flow is its intermittent nature. In this paper, the model analyses and laboratory experiments were conducted in order to clarify the mechanism of intermittent flow occurred at the debris flow front. A model for explaining the intermittent flow of the front was proposed. In the model, the fundamental equations of the front were derived from the one-dimensional equations of the unsteady flow and the resistance formula of debris flow proposed by Egashira et al. (1997). Comparison of the numerical calculations of the model with the experimental results indicated very good agreement. As a result, it was found that the intermittency of movement of the front was caused by the repeat of the jamming process of sediment particles transported from rear part to front, and the failure and remobilization process of the particles jammed.
Year: 2001