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| Titel |
Roads at risk: traffic detours from debris flows in southern Norway |
| VerfasserIn |
N. K. Meyer, W. Schwanghart, O. Korup, F. Nadim |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 15, no. 5 ; Nr. 15, no. 5 (2015-05-19), S.985-995 |
| Datensatznummer |
250119474
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| Publikation (Nr.) |
 copernicus.org/nhess-15-985-2015.pdf |
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| Zusammenfassung |
| Globalisation and interregional exchange of people, goods, and services has
boosted the importance of and reliance on all kinds of transport networks.
The linear structure of road networks is especially sensitive to natural
hazards. In southern Norway, steep topography and extreme weather events
promote frequent traffic disruption caused by debris flows. Topographic
susceptibility and trigger frequency maps serve as input into a hazard
appraisal at the scale of first-order catchments to quantify the impact of
debris flows on the road network in terms of a failure likelihood of each
link connecting two network vertices, e.g. road junctions. We compute total
additional traffic loads as a function of traffic volume and excess
distance, i.e. the extra length of an alternative path connecting two
previously disrupted network vertices using a shortest-path algorithm. Our
risk metric of link failure is the total additional annual traffic load,
expressed as vehicle kilometres, because of debris-flow-related road
closures. We present two scenarios demonstrating the impact of debris flows
on the road network and quantify the associated path-failure likelihood
between major cities in southern Norway. The scenarios indicate that major
routes crossing the central and north-western part of the study area are
associated with high link-failure risk. Yet options for detours on major
routes are manifold and incur only little additional costs provided that
drivers are sufficiently well informed about road closures. Our risk
estimates may be of importance to road network managers and transport
companies relying on speedy delivery of services and goods. |
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