The physics of debris flows

@article{Iverson1997ThePO,
  title={The physics of debris flows},
  author={Richard M. Iverson},
  journal={Reviews of Geophysics},
  year={1997},
  volume={35},
  pages={245 - 296}
}
  • R. Iverson
  • Published 1 August 1997
  • Geology
  • Reviews of Geophysics
Recent advances in theory and experimentation motivate a thorough reassessment of the physics of debris flows. Analyses of flows of dry, granular solids and solid‐fluid mixtures provide a foundation for a comprehensive debris flow theory, and experiments provide data that reveal the strengths and limitations of theoretical models. Both debris flow materials and dry granular materials can sustain shear stresses while remaining static; both can deform in a slow, tranquil mode characterized by… 

Study of pore fluid effect on the mobility of granular debris flows

Granular debris flows in nature are composed of a wide range of solids and viscous pore fluids, moving at high velocities down sloping channels. The pore fluids in a granular debris flow affect the

Dimensional analysis of natural debris flows

Debris flow is generally composed of a wide range of solid particles and viscous pore fluid . I t flows at a high traveling velocity down a slope channel. Interactions between solid and fluid phases

Using PIV to measure granular temperature in saturated unsteady polydisperse granular flows

The motion of debris flows, gravity-driven fast moving mixtures of rock, soil and water can be interpreted using the theories developed to describe the shearing motion of highly concentrated granular

Using PIV to measure granular temperature in saturated unsteady polydisperse granular flows

The motion of debris flows, gravity-driven fast moving mixtures of rock, soil and water can be interpreted using the theories developed to describe the shearing motion of highly concentrated granular

Flow of variably fluidized granular masses across three‐dimensional terrain: 1. Coulomb mixture theory

Rock avalanches, debris flows, and related phenomena consist of grain-fluid mixtures that move across three-dimensional terrain. In all these phenomena the same basic forces govern motion, but

Debris-flow deposition: Effects of pore-fluid pressure and friction concentrated at flow margins

Measurements of pore-fluid pressure and total bed-normal stress at the base of several ~10 m 3 experimental debris flows provide new insight into the process of debris-flow deposition. Pore-fluid

A two-phase debris-flow model that includes coupled evolution of volume fractions, granular dilatancy, and pore-fluid pressure

Pore-fluid pressure plays a crucial role in debris flows because it counteracts normal stresses at grain contacts and thereby reduces intergranular friction. Pore-pressure feedback accompanying

Depositional mechanisms and morphology of debris flow: physical modelling

A comprehensive understanding of the deposition mechanisms and morphology of debris flows is necessary to delineate the extent of a debris flow hazard. However, due to the wide range of debris flow

Process of Occurrence, Flow and Deposition of Viscous Debris Flow

Debris flow generally contains particles whose size distributes in a very wide range, and the fine fraction of them is usually incorporated in the interstitial water to behave as a kind of fluid.

Fluid-particle interaction in geophysical flows: debris flow

Small scale laboratory experiments were conducted to study the dynamic mor- phology and rheological behaviour of fluid-particle mixtures, such as snout-body architecture, levee formation, deposition
...

References

SHOWING 1-10 OF 291 REFERENCES

The physics of debris flows―a conceptual assessment

Debris flows exhibit conspicuous dynamic interactions among their solid and fluid constituents. Key features of the interactions are neglected in traditional theories that treat debris flows as

Dominant particle support mechanisms in debris flows at Mt Thomas, New Zealand, and implications for flow mobility

Within zones of little or no deformation by internal shearing in debris flows at Mt Thomas, about two-thirds of the weight of large particles is supported by buoyancy and about one-third by static

Hydraulic modeling of unsteady debris-flow surges with solid-fluid interactions

Interactions of solid and fluid constituents produce the unique style of motion that typifies debris flows. To simulate this motion, a new hydraulic model represents debris flows as deforming masses

The Mechanics of Rapid Granular Flows

Structural features in granular flows

High-speed motion pictures document a series of essentially two-dimensional, free-surface flows of 6-mm diameter plastic spheres generated in an inclined glass-walled chute 3.7 m long and 6.7 mm

Friction in Debris Flows: Inferences from Large-scale Flume Experiments

A recently constructed flume, 95 m long and 2 m wide, permits systematic experimentation with unsteady, nonuniform flows of poorly sorted geological debris. Preliminary experiments with

Debris flow modeling: A review

A debris flow represents a mixture of sediment particles of various sizes and water flowing down a confined, channel-shaped region (e.g., gully, ravine or valley) down to its end, at which point it

RAPID GRANULAR FLOWS

A granular material is a collection of a large number of discrete solid particles. Generally, the interstices between the particles are filled with a fluid such as air or water, and thus,

Hydraulic theory for a debris flow supported on a collisional shear layer.

The balance laws, constitutive relations, and boundary conditions of a kinetic theory for dense granular flows are adopted and the relationship between shear stress, normal stress, and relative velocity of the boundaries in the shear layer is determined in an analysis of a steady shearing flow between identical bumpy boundaries.

Debris Flow on Prismatic Open Channel

Reviews on the yield strength and viscosity of the interstitial clay slurry in debris flow prove that ordinary debris flow may be modeled as a dilatant fluid in which the intergranular forces
...