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-2018-27
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
07 Feb 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).
Natural hazard events affecting transportation networks in Switzerland from 2012 to 2016
Jérémie Voumard, Marc-Henri Derron, and Michel Jaboyedoff Risk analysis group, Institute of Earth Sciences, FGSE, University of Lausanne, Switzerland
Abstract. Switzerland is a country threatened by a lot of natural hazards. Many events occur in built environment, affecting infrastructures, buildings or transportation networks and producing occasionally expensive damages. This is the reason why large landslides are generally well studied and monitored in Switzerland to reduce the financial and human risks. However, we have noticed a lack of data on small events which have impacted roads and railways these last years. Therefore, we have collected all the reported natural hazard events which have affected the Swiss transportation networks since 2012 in a database. More than 800 events affecting roads and railways have been recorded in five years from 2012 to 2016. These events are classified into six classes: earth flow, debris flow, rockfall, flood, snow avalanche and others.

Data come from Swiss online press articles sorted by Google Alerts. The search is based on more than thirty keywords, in three languages (Italian, French, German). After verifying that the article relates indeed an event which has affected a road or a railways track, it is studied in detail. We get finally information on about sixty attributes by event about event date, event type, event localisation, meteorological conditions as well as impacts and damages on the track and human damages. From this database, many trends over the five years of data collection can be outlined: in particular, the spatial and temporal distributions of the events, as well as their consequences in term of traffic (closure duration, deviation, etc.).

Even if the database is imperfect because of it was built and because of the short time period considered, it highlights the not negligible impact of small natural hazard events on roads and railways in Switzerland at a national level. This database helps to better understand and quantify this type of events and to better integrate them in risk assessment.

Citation: Voumard, J., Derron, M.-H., and Jaboyedoff, M.: Natural hazard events affecting transportation networks in Switzerland from 2012 to 2016, Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2018-27, in review, 2018.
Jérémie Voumard et al.
Jérémie Voumard et al.
Jérémie Voumard et al.

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Short summary
Natural hazard events affecting the Swiss transportation networks during the five years time period 2012–2016 were collected in a database witg a significant effort on small events (< 10 m3) that are generally bellow radar screen. 95 % of 848 collected events are small events which annual direct cost was estimated at EUR 2.5 millions. Anaysis of the 172 attributes by events allow us to highlight their spatial, temporal and damage trends as well as their impacts on the road and railway traffic.
Natural hazard events affecting the Swiss transportation networks during the five years time...
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