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| Titel |
Quantification of the influence of preferential flow on slope stability using a numerical modelling approach |
| VerfasserIn |
W. Shao, T. A. Bogaard, M. Bakker, R. Greco |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 5 ; Nr. 19, no. 5 (2015-05-07), S.2197-2212 |
| Datensatznummer |
250120706
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| Publikation (Nr.) |
 copernicus.org/hess-19-2197-2015.pdf |
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| Zusammenfassung |
| The effect of preferential flow on the stability of landslides is studied
through numerical simulation of two types of rainfall events on a
hypothetical hillslope. A model is developed that consists of two parts. The
first part is a model for combined saturated/unsaturated subsurface flow and
is used to compute the spatial and temporal water pressure response to
rainfall. Preferential flow is simulated with a dual-permeability continuum
model consisting of a matrix domain coupled to a preferential flow domain.
The second part is a soil mechanics model and is used to compute the spatial
and temporal distribution of the local factor of safety based on the water
pressure distribution computed with the subsurface flow model. Two types of
rainfall events were considered: long-duration, low-intensity rainfall, and
short-duration, high-intensity rainfall. The effect of preferential flow on
slope stability is assessed through comparison of the failure area when
subsurface flow is simulated with the dual-permeability model as compared to
a single-permeability model (no preferential flow). For the low-intensity
rainfall case, preferential flow has a positive effect on drainage of the
hillslope resulting in a smaller failure area. For the high-intensity
rainfall case, preferential flow has a negative effect on the slope stability
as the majority of rainfall infiltrates into the preferential flow domain
when rainfall intensity exceeds the infiltration capacity of the matrix
domain, resulting in larger water pressure and a larger failure area. |
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