The impacts of hysteresis on variably saturated hydrologic response and slope failure

This investigation employs 3D, variably saturated subsurface flow simulation to examine hysteretic effects upon the hydrologic response used to drive unsaturated slope stability assessments at the Coos Bay 1 (CB1) experimental catchment in the Oregon Coast Range, USA. Slope stability is evaluated us...

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Bibliographic Details
Published in:Environmental earth sciences 2010-09, Vol.61 (6), p.1215-1225
Main Authors: Ebel, Brian A., Loague, Keith, Borja, Ronaldo I.
Format: Article
Language:English
Subjects:
Biogeosciences
Drying
Earth and Environmental Science
Earth Sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Environmental impact
Environmental Science and Engineering
Exact sciences and technology
Geochemistry
Geology
Hydrology/Water Resources
Landslides & mudslides
Moisture content
Natural hazards: prediction, damages, etc
Original Article
Retention
Slope stability
Soil water
Terrestrial Pollution
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Summary:This investigation employs 3D, variably saturated subsurface flow simulation to examine hysteretic effects upon the hydrologic response used to drive unsaturated slope stability assessments at the Coos Bay 1 (CB1) experimental catchment in the Oregon Coast Range, USA. Slope stability is evaluated using the relatively simple infinite slope model for unsaturated soils driven by simulated pore-water pressures for an intense storm that triggered a slope failure at CB1 on 18 November 1996. Simulations employing both hysteretic and non-hysteretic soil–water retention curves indicate that using either the drying soil–water retention curve or an intermediate soil–water retention curve that attempts to average the wetting and drying retention curves underestimates the near-surface hydrologic response and subsequently the potential for slope failure. If hysteresis cannot be considered in the hydrologic simulation, the wetting soil–water retention curve, which is seldom measured, should be used for more physically based slope stability assessment. Without considering hysteresis or using the wetting soil–water retention curve, the potential for landsliding in unsaturated materials may be underestimated and a slope failure could occur when simulations predict stability.
ISSN:1866-6280
1866-6299
DOI:10.1007/s12665-009-0445-2