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DEBRIS FLOW MODELING FOR SUSCEPTIBILITY MAPPING AT REGIONAL TO NATIONAL SCALE IN NORWAY (2012)

Debris flows and related landslide processes occur in many regions all over Norway and pose a significant hazard to inhabited areas. Within the framework of the development of a national debris flows susceptibility map, we are working on a modeling approach suitable for Norway with a nationwide coverage. The discrimination of source areas is based on an index approach, which includes topographic parameters and hydrological settings. For the runout modeling, we use the Flow-R model (IGAR, University of Lausanne), which is based on combined probabilistic and energetic algorithms for the assessment of the spreading of the flow and maximum runout distances. First results for different test areas have shown that runout distances can be modeled reliably. For the selection of source areas, however, additional factors have to be considered, such as the lithological and quaternary geological setting, in order to accommodate the strong variation in debris flow activity in the different geological, geomorphological and climate regions of Norway.
Reference:
Landslides and Engineered Slopes: Protecting Society through Improved Understanding – Eberhardt et al. (eds) 2012 Taylor & Francis Group, London
Organization:
Geological Survey of Norway/International Centre of Geohazards, 7491 Trondheim, Norway
Norway
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