| 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. |
| Genre: | Conference Paper |
| ProdID: | 70020054 |
| Citation Author: | Reid, Mark, E.; LaHusen, Richard, G.; Iverson, Richard, M. |
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| Citation End Page: | 11 |
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| Citation Language: | English |
| Citation Larger Work Title: | International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, Proceedings |
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| Citation Number Of Pages: | 11 |
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| Citation Publisher: | ASCE |
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| Citation Search Results Text: | Debris-flow initiation experiments using diverse hydrologic triggers; 1997; Conference Paper; International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, Proceedings; Reid, Mark, E.; LaHusen, Richard, G.; Iverson, Richard, M. |
| Citation Start Page: | 1 |
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| Citation Year: | 1997 |
| Type: | citation/reference |
| Text: | Debris-flow initiation experiments using diverse hydrologic triggers; 1997; Conference Paper; International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, Proceedings; Reid, Mark, E.; LaHusen, Richard, G.; Iverson, Richard, M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1997 00:00 -0600 |
| Publisher: | ASCE |
