From slope- to regional-scale shallow landslides susceptibility assessment using TRIGRS

  • Bordoni M
  • Meisina C
  • Valentino R
  • et al.
ISSN: 2195-9269
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Abstract

Abstract. Rainfall-induced shallow landslides are common phenomena in many parts of the world, affecting cultivations and infrastructures and causing sometimes human losses. Assessing the shallow landslides susceptibility is fundamental for land planning at different scales. This work defines a reliable methodology to extend the slope stability analysis from the local to the regional scale by using a well established physically-based model (TRIGRS-Unsaturated). The model is applied at first for a sample slope and then to the surrounding area of 13.4 km2 in Oltrepo Pavese (Northern Italy). In order to obtain more reliable input data for the model, a long-term hydro-meteorological monitoring has been carried out at the sample slope, that has been assumed as representative of the study area. Field measurements allowed for identifying the triggering mechanism of shallow failures and were used to calibrate the model. After obtaining modelled pore water pressures at the slope scale consistent with those measured during the monitoring activity, more reliable trends have been modelled also for past landslide events, as the April 2009 event that has been assumed as benchmark. The shallow landslides susceptibility assessment obtained using TRIGRS-Unsaturated for the benchmark event appears good for both the monitored slope and the whole study area, with better results if a pedological instead of geological zoning is considered at regional scale. The scheme followed in this work allows for obtaining better results of shallow landslides susceptibility assessment in terms of reduction of overestimation of unstable areas with respect to other distributed models applied in the past.

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APA

Bordoni, M., Meisina, C., Valentino, R., Bittelli, M., & Chersich, S. (2014). From slope- to regional-scale shallow landslides susceptibility assessment using TRIGRS. Natural Hazards and Earth System Sciences Discussions, 2(12), 7409–7464. Retrieved from http://www.nat-hazards-earth-syst-sci-discuss.net/2/7409/2014/

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