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Rainfall patterns for shallow landsliding in perialpine Slovenia

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Abstract

This paper presents two types of analysis: an antecedent rainfall analysis based on daily rainfall and an intensity-duration analysis of rainfall events based on hourly data in perialpine Slovenia in the Škofjeloško Cerkljansko hills. For this purpose, eight rainfall events that are known to have caused landslides in the period from 1990 to 2010 were studied. Over the observed period, approximately 400 records of landslides were collected. Rainfall data were obtained from three rain gauges. The daily rainfall from the 30 days before landslide events was investigated based on the type of landslides and their geo-environmental setting, the dates of confirmed landslide activity and different consecutive rainfall periods. The analysis revealed that the rainfall events triggering slope failure can be divided into two groups according to the different antecedent periods. The first group of landslides typically occurred after short-duration rainstorms with high intensity, when the daily rainfall exceeded the antecedent rainfall. The second group comprises the rainfall events with a longer antecedent period of at least 7 days. A comparison of the plotted peak and mean intensities indicates that the rainfall patterns that govern slope failure are similar but do not necessarily reflect the rainfall intensity at the time of shallow landslides in the Davča or Poljane areas, where the majority of the landslides occurred. Because of several limitations, the suggested threshold cannot be compared and evaluated with other thresholds.

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Acknowledgments

This research was supported by the Alpine Space Programme within the framework of project AdaptAlp (2-1-3-D) and was financed by the European Commission and the ARRS (Slovenian Research Agency) J1-913 project.

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  1. Geological Survey of Slovenia, Dimičeva Ulica 14, 1000, Ljubljana, Slovenia

    Mateja Jemec & Marko Komac

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  1. Mateja Jemec
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  2. Marko Komac
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Correspondence to Mateja Jemec.

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Jemec, M., Komac, M. Rainfall patterns for shallow landsliding in perialpine Slovenia. Nat Hazards 67, 1011–1023 (2013). https://doi.org/10.1007/s11069-011-9882-9

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