The resulting debris flow travels down the feeder channel and onto the surface of the fan. Debris flows are an important means of sediment transport and deposition in subaerial and subaqueous settings. A cohesive debris flow has peculiar properties; in particular the distance it can travel is generally larger than the non-cohesive counterpart. They commonly transform into dilute flow types (e.g., hyperconcentrated flow, concentrated density flow, or turbidity current) when they mix with ambient water. Therefore, it is important to forecast possible scenarios of debris flows under extreme weather conditions. In contrast to the laboratory debris flows, the presence of large boulders and the higher normal pressure inside the natural debris flow requires the introduction of a novel rheological model that distinguishes between mud‐to–clast supported material. We present simulations with a modified BING model with the new cohesive‐frictional rheology. Debris-flow-dominated alluvial fans are found to consist of a network of mostly inactive distributary channels in the upper fan that gives way to mid- to lower-level lobes. Debris flows can cause severe loss of human lives and damage to property, especially on densely populated hilly terrains. For the former, great progress has been achieved on the mechanisms of soil failure and liquefaction. Cohesive debris flows are generally massive and structureless, although several flows show an inverse-graded zone at their base indicating dispersive pressure forces that developed in a traction carpet. In contrast to the laboratory debris flows, the presence of large boulders and the higher normal pressure inside the natural debris flow requires the introduction of a novel rheological model that distinguishes between mud‐to–clast supported material. flow dynamics, and damage in the 9 January 2018 Montecito debris-flow event, California, USA: Opportunities and challenges for post-wildfire risk assessment. In the changing climate, the frequency of debris flows is on a rising trend. Geosphere, 15(4), 1140–1163. The Pilcaya debris flow traveled along a narrow tectonic depression up to a distance of 40 km and then spread over a flat plain reaching up to 55 km from the volcano summit. Other flows display coarse-tail fining-upward sequences indicating deposition by suspension settling from liquefied flow. The model is based on a molecular dynamics algorithm where the equation of motion is calculated for an ensemble of interacting particles. Sand supply routes to deep sea. Debris flow - cohesive - debrite D - laminar flow Co-genetic flows - hybrid - Linked debate LD Slurry flow - transitional - banded sandstone H density turbidity current - non - cohesive - HDT L density turbidity current - non cohesive - LDT. Previous numerical studies often deal with one individual debris flow in one analysis. A debris flow is a soil flow where the majority of the materials are coarse-grained (fine sand to boulder size particles) and non-cohesive. The initial of debris flow can be classified into two types based on their triggering positions, that is, debris flow from slope and debris flow from gully or channel. Shelf fed sed system Volcanogenic debris flows can be cohesive, especially where flows are fed by the remobilisation of old, altered deposits. Debris flows are most often triggered by intense rainfall following a period of less intense precipitation, or by rapid snow melt. 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