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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/nhess-2019-217
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2019-217
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 12 Aug 2019

Submitted as: research article | 12 Aug 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).

High accuracy coastal flood mapping for Norway using LiDAR data

Kristian Breili1,2, Matthew James Ross Simpson1, Erlend Klokkervold3, and Oda Roaldsdotter Ravndal4 Kristian Breili et al.
  • 1Geodetic Institute, Norwegian Mapping Authority, 3507 Hønefoss, Norway
  • 2Faculty of Science and Technology, Norwegian University of Life Sciences, 1432 Ås, Norway
  • 3Geographic Information System Development, Norwegian Mapping Authority, 3507 Hønefoss, Norway
  • 4Hydrographic Service, Norwegian Mapping Authority, 4021 Stavanger, Norway

Abstract. Using new high accuracy Light Detection and Ranging elevation data we generate coastal flooding maps for Norway. Thus far, we have mapped ~ 80 % of the coast, for which we currently have data of sufficient accuracy to perform our analysis. Although Norway is generally at low risk from sea-level rise largely owing to its steep topography, the maps presented here show that on local scales, many parts of the coast are potentially vulnerable to flooding. There is a considerable amount of infrastructure at risk along the relatively long and complicated coastline. Nationwide we identify a total area of 400 km2, 105,000 buildings, and 510 km of roads that are at risk of flooding from a 200 year storm-surge event at present. These numbers will increase to 610 km2, 137,000, and 1340 km with projected sea-level rise to 2090 (95th percentile of RCP8.5 as recommended in planning). We find that some of our results are likely biased high owing to erroneous mapping (at least for lower water levels close to the tidal datum which delineates the coastline). A comparison of control points from different terrain types indicates that the elevation model has a root mean square error of 0.26 m and is the largest source of uncertainty in our mapping method. The coastal flooding maps and associated statistics are freely available, and alongside the development of coastal climate services, will help communicate the risks of sea-level rise and storm surge to stakeholders. This will in turn aid coastal management and climate adaption work in Norway.

Kristian Breili et al.
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Short summary
Using accurate elevation data we generate coastal flooding maps for Norway. Although Norway is at low risk from sea-level rise, parts of the coast are potentially vulnerable to flooding. Nationwide we identify an area of 400 km2, 105,000 buildings, and 510 km of roads that are at risk of flooding from a storm surge at present. These numbers increase to 610 km2, 137,000, and 1340 km with projected sea-level rise to 2090. The maps aid coastal management and climate adaption in Norway.
Using accurate elevation data we generate coastal flooding maps for Norway. Although Norway is...
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