Field observations of basal forces and fluid pore pressure in a debris flow

Details Field observations of basal forces and fluid pore pressure in a debris flow Field observations of basal forces and fluid pore pressure in a debris flow

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3407406m&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 7, CiteID L07406

Physics

10

Hydrology: Debris Flow And Landslides, Hydrology: Geomorphology: Hillslope (1625), Hydrology: Instruments And Techniques: Monitoring

Scientific paper

Using results from an 8 m2 instrumented force plate we describe field measurements of normal and shear stresses, and fluid pore pressure for a debris flow. The flow depth increased from 0.1 to 1 m within the first 12 s of flow front arrival, remained relatively constant until 100 s, and then gradually decreased to 0.5 m by 600 s. Normal and shear stresses and pore fluid pressure varied in-phase with the flow depth. Calculated bulk densities are ρ b = 2000-2250 kg m-3 for the bulk flow and ρ f = 1600-1750 kg m-3 for the fluid phase. The ratio of effective normal stress to shear stress yields a Coulomb basal friction angle of $\phi$ = 26° at the flow front. We did not find a strong correlation between the degree of agitation in the flow, estimated using the signal from a geophone on the force plate, and an assumed dynamic pore fluid pressure. Our data support the idea that excess pore-fluid pressures are long lived in debris flows and therefore contribute to their unusual mobility.

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