What question did this study set out to answer?

To establish a comprehensive physical theory of debris flows by examining the coupled interactions between solid granular grains and viscous pore fluid.

August 1, 1997Reviews of GeophysicsOpen Access

The physics of debris flows

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Authors

RIRichard M. IversonUnited States Geological Survey

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Implication

Theoretical and experimental analysis demonstrates how pore-fluid pressure mediates granular interactions in debris flows, highlighting mechanisms behind surge dynamics and flow mobility.

Key Points

To establish a comprehensive physical theory of debris flows by examining the coupled interactions between solid granular grains and viscous pore fluid.
Synthesized mechanics of dry granular materials and solid-fluid mixtures incorporating granular temperature and fluid pressure dynamics.
Conducted physical experiments using ~10 m³ of poorly sorted, water-saturated sediment to measure basal pore-fluid pressure and surge behavior.
Formulated depth-averaged equations of motion based on Savage-Hutter granular flow theory generalized to include viscous pore fluid of variable pressure.
Experimental debris flows propagate as unsteady surges where coarse-grained fronts exhibit negligible pore-fluid pressure, whereas fine-grained trailing debris sustains high pore pressure that causes near-liquefaction.
Vibrational kinetic energy of grains (granular temperature) and elevated pore-fluid pressures reduce intergranular friction, controlling transitions between rigid resistance and fluid motion.
Depth-averaged numerical formulations successfully predict unsteady, nonuniform flow surges across a continuum between wet rock avalanches and sediment floods.

Cite This Study

Richard M. Iverson (1997) studied this question.

synapsesocial.com/papers/69d7387b8e958094d1b8a46e https://doi.org/10.1029/97rg00426

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Implication

Theoretical and experimental analysis demonstrates how pore-fluid pressure mediates granular interactions in debris flows, highlighting mechanisms behind surge dynamics and flow mobility.

The physics of debris flows

Discussion

Member takes

Implication

Key Points

Cite This Study

The physics of debris flows

Discussion

Member takes

Implication

Key Points

Cite This Study

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