Nat. Hazards Earth Syst. Sci., 18, 2093–2109, 2018 https://doi.org/10.5194/nhess-18-2093-2018 © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License. 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, Lausanne, Switzerland Correspondence: Jérémie Voumard (
[email protected]) Received: 2 February 2018 – Discussion started: 7 February 2018 Revised: 29 July 2018 – Accepted: 31 July 2018 – Published: 8 August 2018 Abstract. Switzerland is threatened by many natural haz- 1 Introduction ards. Many events occur in built-up environments, affecting infrastructure, buildings, and transportation networks, occa- Natural hazards cause much damage to transportation net- sionally producing expensive damages. This expense is why works worldwide (Nicholson and Du, 1997; Hungr et al., large landslides are generally well studied and monitored in 1999; Dalziell and Nicholson, 2001; Karlaftis et al., 2007; Switzerland to reduce the financial and human risks. How- Tatano and Tsuchiya, 2008; Erath et al., 2009; Muzira et al., ever, there is a lack of data on small events, which have re- 2010; Jelenius and Mattsson, 2012). Particularly in moun- cently affected roads and railways. Therefore, in this study, tainous areas, floods, landslides (considered earth flows in all of the reported natural hazard events that have affected this study), debris flows, rockfalls, and snow avalanches Swiss transportation networks since 2012 were collected in a (called avalanches in this paper) can seriously affect the traf- database. More than 800 events affecting roads and railways fic on roads and railway tracks, isolating villages or regions were recorded within in a 5-year period from 2012 to 2016.