2025 Volume 81 Issue 16 Article ID: 24-16125
This study aims to open up new horizons in the study of debris flows by examining the mechanisms of debris flow with erosion of valley beds and banks by debris flows from the viewpoints of both momentum and energy. First, the mechanism of growth and development of the debris flow head were clarified from the viewpoint of momentum by incorporating eroded gravel particles and the effect of the incorporation of gravel particles on the flow field of the debris flow head. Next, to obtain an overall view of the field of the debris flow, the temporal and spatial variation of the flow and gravel analyzed by the APM method was used to examine the energy perspective. The energy storage and release processes, such as the localized increase in the energy of the debris flow due to erosion and collapse and the accumulation of gravel and stones, and the release of the energy when the accumulated gravel particles are re-moved by the increased energy, were found to be important mechanisms of the debris flow.
