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| Titel |
A method for predicting the factor of safety of an infinite slope based on the depth ratio of the wetting front induced by rainfall infiltration |
| VerfasserIn |
B.-G. Chae, J.-H. Lee, H.-J. Park, J. Choi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 15, no. 8 ; Nr. 15, no. 8 (2015-08-18), S.1835-1849 |
| Datensatznummer |
250119638
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| Publikation (Nr.) |
 copernicus.org/nhess-15-1835-2015.pdf |
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| Zusammenfassung |
| Most landslides in Korea are classified as shallow landslides with an
average depth of less than 2 m. These shallow landslides are associated with
the advance of a wetting front in the unsaturated soil due to rainfall
infiltration, which results in an increase in water content and a reduction
in the matric suction in the soil. Therefore, this study presents a modified
equation of infinite slope stability analysis based on the concept of the
saturation depth ratio to analyze the slope stability change associated with
the rainfall on a slope. A rainfall infiltration test in unsaturated soil
was performed using a column to develop an understanding of the effect of
the saturation depth ratio following rainfall infiltration. The results
indicated that the rainfall infiltration velocity due to the increase in
rainfall in the soil layer was faster when the rainfall intensity increased.
In addition, the rainfall infiltration velocity tends to decrease with
increases in the unit weight of soil. The proposed model was applied to
assess its feasibility and to develop a regional landslide susceptibility
map using a geographic information system (GIS). For that purpose, spatial
databases for input parameters were constructed and landslide
locations were obtained. In order to validate the proposed approach, the
results of the proposed approach were compared with the landslide inventory
using a ROC (receiver operating characteristics) graph. In addition, the
results of the proposed approach were compared with the previous approach
used: a steady-state hydrological model. Consequently, the approach proposed in
this study displayed satisfactory performance in classifying landslide
susceptibility and showed better performance than the steady-state approach. |
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