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Surge dynamics coupled to pore-pressure evolution in debris flows

By:  and 
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,.

Additional publication details

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
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