Surge dynamics coupled to pore-pressure evolution in debris flows
Edited by: Rickenmann D.Chen C.L.
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Abstract
Temporally and spatially varying pore-fluid pressures exert strong controls on debris-flow motion by mediating internal and basal friction at grain contacts. We analyze these effects by deriving a one-dimensional model of pore-pressure diffusion explicitly coupled to changes in debris-flow thickness. The new pore-pressure equation is combined with Iverson's (1997) extension of the depth-averaged Savage-Hutter (1989, 1991) granular avalanche equations to predict motion of unsteady debris-flow surges with evolving pore-pressure distributions. Computational results illustrate the profound effects of pore-pressure diffusivities on debris-flow surge depths and velocities. ?? 2003 Millpress,.
Suggested Citation
Savage, S., Iverson, R., 2003, Surge dynamics coupled to pore-pressure evolution in debris flows, in International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, Proceedings, v. 1, Davos, 10 September 2003 through 12 September 2003, p. 503-514.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Surge dynamics coupled to pore-pressure evolution in debris flows |
| Volume | 1 |
| Year Published | 2003 |
| Language | English |
| Larger Work Title | International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, Proceedings |
| First page | 503 |
| Last page | 514 |
| Conference Title | 3rd International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment |
| Conference Location | Davos |
| Conference Date | 10 September 2003 through 12 September 2003 |