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Discussion papers | Copyright
https://doi.org/10.5194/nhess-2017-437
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 20 Dec 2017

Research article | 20 Dec 2017

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This discussion paper is a preprint. It has been under review for the journal Natural Hazards and Earth System Sciences (NHESS). A final paper in NHESS is not foreseen.

Impacts of extreme weather events on transport infrastructure in Norway

Regula Frauenfelder1, Anders Solheim1, Ketil Isaksen2, Bård Romstad3,a, Anita V. Dyrrdal2, Kristine H. H. Ekseth1, Alf Harbitz4, Carl B. Harbitz1, Jan Erik Haugen2, Hans Olav Hygen2, Hilde Haakenstad2, Christian Jaedicke1, Árni Jónsson1, Ronny Klæboe5, Johanna Ludvigsen5, Nele M. Meyer1, Trude Rauken3,b, Reidun G. Skaland2, Kjetil Sverdrup-Thygeson1, Asbjørn Aaheim3, Heidi Bjordal6, and Per-Anton Fevang7 Regula Frauenfelder et al.
  • 1Norwegian Geotechnical Institute, Oslo, Norway
  • 2The Norwegian Meteorological Institute, Oslo, Norway
  • 3CICERO Centre for Climate and Environmental Research, Oslo, Norway
  • 4Institute of Marine Research, Bergen, Norway
  • 5Institute of Transport Economics, Oslo , Norway
  • 6Norwegian Public Roads Administration, Oslo, Norway
  • 7Bane NOR, Oslo, Norway
  • anow at: Amedia, Oslo, Norway
  • bnow at: Municipality of Oslo, Oslo, Norway

Abstract. This paper presents selected results of the interdisciplinary research project Impacts of extreme weather events on infrastructure in Norway (InfraRisk) carried out between 2010 to 2013, as part of the program NORKLIMA (20042013) of the Research Council of Norway (RCN). The project has systematized large amounts of existing data and generated new results that are important for our handling of risks associated with future extreme weather and natural hazards threatening the transport infrastructure in Norway. The results of the InfaRisk project range widely, from the establishment of trends in key weather elements to studies of human response to threats from extreme weather. The analyses of weather elements have provided a clearer understanding of the trends in the development of extreme weather. The studies are based on both historical data and available future scenarios (projections) from climate models. Compared to previous studies, we calculated changes in climate variables that are particularly important in relation to nature hazards. Overall, the analyses document an increase in frequency as well as intensity of both precipitation and wind. Results of projections show that the observed changes will continue throughout this century. We could also identify large regional differences, with some areas experiencing, e.g., a reduction in the intensity of heavy rainfall events. However, most of the country will experience the opposite, i.e., both increased intensity and increased frequency of heavy precipitation. Our analyses show that at least 27 per cent of Norwegian roads and 31 per cent of railroads are exposed to rock fall and snow avalanches hazards. The project has also assessed relationships between different parameters that can affect the likelihood of debris flows. Variables such as terrain slope and size of watercourses are important, while local climate, which varies widely in Norway, determines threshold values for rainfall that can trigger debris flows.

Regula Frauenfelder et al.
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Interactive discussion
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Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Regula Frauenfelder et al.
Regula Frauenfelder et al.
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We present results from the project Impacts of extreme weather events on infrastructure in Norway. Our analyses document an increase in frequency and intensity of e.g. precipitation and wind during the last decades, and that these observed changes will continue throughout the 21st century. We could show that ≥ 27 % of main roads and 31 % of railroads are exposed to rockfall and avalanches. Pro-actively facing such risks will increase resilience and cost-efficiency of the transport infrastructure.
We present results from the project Impacts of extreme weather events on infrastructure in...
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