Debris-flow initiation experiments using diverse hydrologic triggers
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Abstract
Controlled debris-flow initiation experiments focused on three hydrologic conditions that can trigger slope failure: localized ground-water inflow; prolonged moderate-intensity rainfall; and high-intensity rainfall. Detailed monitoring of slope hydrology and deformation provided exceptionally complete data on conditions preceding and accompanying slope failure and debris-flow mobilization. Ground-water inflow and high-intensity sprinkling led to abrupt, complete failure whereas moderate-intensity sprinkling led to retrogressive, block-by-block failure. Failure during ground-water inflow and during moderate-intensity sprinkling occurred with a rising water table and positive pore pressures. Failure during high-intensity sprinkling occurred without widespread positive pore pressures. In all three cases, pore pressures in most locations increased dramatically (within 2-3 seconds) during failure. In some places, pressures in unsaturated materials rapidly 'flashed' from zero to elevated positive values. Transiently elevated pore pressures and partially liquefied soil enhanced debris-flow mobilization.
Suggested Citation
Reid, M.E., LaHusen, R.G., Iverson, R.M., 1997, Debris-flow initiation experiments using diverse hydrologic triggers, in International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, Proceedings, San Francisco, CA, USA, 7 August 1997 through 9 August 1997, p. 1-11.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Debris-flow initiation experiments using diverse hydrologic triggers |
| Year Published | 1997 |
| Language | English |
| Publisher | ASCE |
| Publisher location | New York, NY, United States |
| Larger Work Title | International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, Proceedings |
| First page | 1 |
| Last page | 11 |
| Conference Title | Proceedings of the 1997 1st International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment |
| Conference Location | San Francisco, CA, USA |
| Conference Date | 7 August 1997 through 9 August 1997 |