Preprints
https://doi.org/10.5194/nhess-2021-230
https://doi.org/10.5194/nhess-2021-230

  04 Aug 2021

04 Aug 2021

Review status: this preprint is currently under review for the journal NHESS.

Evaluating landslide response in seismic and rainfall regime: A case study from the SE Carpathians, Romania

Vipin Kumar1, Léna Cauchie1, Anne-Sophie Mreyen1, Mihai Micu2, and Hans-Balder Havenith1 Vipin Kumar et al.
  • 1Georisk and Environment, Department of Geology, University of Liege, Belgium
  • 2Institute of Geography, Romanian Academy, Bucharest, Romania

Abstract. There have been many studies exploring the rainfall induced slope failures in the earthquake affected terrain. However, studies evaluating the potential effects of both landslide triggering factors; rainfall and earthquake have been infrequent despite the rising global landslide mortality risk. The SE Carpathians, which have been subjected to many large historical earthquakes and changing climate and thus resulting in frequent landslides, is one such region that is least explored in this context. Therefore, a massive (~9.1 Mm2) landslide, situated along the Basca Rozilei River, in the Vrancea Seismic Zone, SE Carpathians is chosen as a case study area to achieve the aforesaid objective. The present state of slope reveals the Factor of Safety in a range of 1.17–1.32 with a static condition displacement of 0.4–4 m that reaches up to 8–60 m under dynamic (earthquake) condition. The Groundwater (GW) effect further decreases the Factor of Safety and increases the displacement. Ground motion amplification enhances the possibility of slope surface deformation and displacements. The debris flow prediction, implying the excessive rainfall effect, reveals a flow having 9.0–26.0 m height and 2.1–3.0 m/sec velocity along the river channel. The predicted extent of potential debris flow is found to follow the trails possibly created by previous debris flow and/or slide events.

Vipin Kumar et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2021-230', Anonymous Referee #1, 09 Sep 2021
  • RC2: 'Comment on nhess-2021-230', Tapas Martha, 12 Sep 2021

Vipin Kumar et al.

Vipin Kumar et al.

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Short summary
The SE Carpathians belong to one of the most active seismic regions of Europe and are also subjected to changing climate. These natural processes are resulting in frequent landslides, particularly of debris flow type. Despite these regimes, the region has been least explored to understand the potential effects of the landslides in seismic and rainfall regimes. This study attempts to fulfill this gap by evaluating landslide response under seismic & extreme rainfall regime.
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