ISSN 2029-056X (online)
|2011 m. Nr. 2
Influence of rainfalls of varying intensity on slope stability
The paper presents results of calculating the infiltration process and slope stability of one of the shallow landslides that were activated in Targanice near Andrychów (Beskid Mały Mts.) as a result of a disastrous rainfall lasting about 2.5 hours. The study aimed at the analysis of slope stability conditions in terms of the formation of a wetting front related to a single rainfall of constant and varying intensity.
Infiltration calculations made using the one- and two-dimensional (hydrological) Green–Ampt model revealed significant differences in the precipitation–infiltration–surface-runoff relationship, showing that calculations using the one-dimensional model give higher values of infiltration and thus rate this method as a more conservative (safe) one from the point of view of slope stability assessment. It is shown that rainfalls of a high intensity at the initial phase decreasing with time and rainfalls of constant intensity contribute to the highest values of infiltration accumulation and thus to the penetration depth to the soil. The depth of the wetting front changing during the rainfall influences the slope stability conditions.
Keywords: shallow landslides, infiltration, Green–Ampt model, slope stability, Carpathian flysch
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