Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/nhess-2017-411
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
27 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).
Regional landslide forecasting in Piemonte (Italy) and in Norway: experiences from 2013 late spring
Davide Tiranti1, Graziella Devoli2,3, Roberto Cremonini1, Monica Sund2, and Søren Boje2 1Regional Agency for Environmental Protection of Piemonte (ARPA Piemonte), Department of Natural and Environmental Risks, Torino, 10135, Italy
2Norwegian Water Resources and Energy Directorate (NVE), Section for forecast of flood and landslide hazards, Oslo, 0368, Norway
3Department of Geosciences, University of Oslo, Oslo, 0316, Norway
Abstract. A few countries in the world operate systematically national and regional forecasting services for rainfall-induced landslides (i.e. shallow landslides, debris flows and debris avalanches), among them: Norway and Italy. In Norway, the Norwegian Water Resources and Energy Directorate (NVE) operates a landslide forecasting service at national level. A daily national hazard assessment is performed, describing both expected awareness level and type of landslide hazard for a selected warning region. In Italy, each administrative region has its own regional environmental agency (Regional Agency for Environmental Protection, ARPA) that is responsible of the daily landslide hazard assessments and emission of landslide warnings for one or more catchments within the region. One of these agencies, the ARPA Piemonte, is responsible for issuing landslide warnings for the Piemonte region, located in Northwestern Italy. Both services provide regular landslide hazard assessments founded on a combination of quantitative thresholds and daily rainfall forecasts together with qualitative expert analysis. Daily warning reports are published at http://www.arpa.piemonte.gov.it/rischinaturali and www.varsom.no.

On spring 2013, the ARPA Piemonte, and the NVE issued warnings for hydro-meteorological hazards due to the arrival of a deep and large low-pressure system, called herein Vb cyclone. This kind of weather system is known to produce the largest floods in Europe. Less known is that the weather type can trigger landslides as well. In this study, we present the experiences acquired in late spring 2013 by NVE and ARPA Piemonte.

From 27th April to 19nd May 2013, more than 400 mm rain in Piemonte caused severe floods and diffused landslides. In Norway, the same weather type lasted from 15th May to 2nd June 2013 and brought warm winds with high temperatures that caused intense snow melt over a large area, and brought a lot of rain in the Southeastern Norway, initiating large flood along Glomma river and several landslides. Floods and landslides produced significant damages to roads and railways along with buildings and other infrastructure in both countries.


Citation: Tiranti, D., Devoli, G., Cremonini, R., Sund, M., and Boje, S.: Regional landslide forecasting in Piemonte (Italy) and in Norway: experiences from 2013 late spring, Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2017-411, in review, 2017.
Davide Tiranti et al.
Davide Tiranti et al.
Davide Tiranti et al.

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