Comparative Risk Assessments for the City of Cologne – Storms, Floods, Earthquakes |
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Authors: | G Grünthal A H Thieken J Schwarz K S Radtke A Smolka B Merz |
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Institution: | (1) GeoForschungsZentrum Potsdam, Telegrafenberg, Potsdam, D-14473, Germany;(2) Bauhaus-University Weimar, Geschwister-Scholl-Str. 8, D-99421 Weimar, Germany;(3) University Leipzig, Stephanstr. 3, 04103 Leipzig, Germany;(4) Munich Reinsurance Company, 80791 Munich, Germany |
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Abstract: | In this paper a methodology for a multi-risk assessment of an urban area is introduced and performed for the city of Cologne,
Germany, considering the natural hazards windstorm, flooding and earthquake. Moreover, sources of the uncertainty in the analysis
and future needs for research are identified. For each peril the following analyses were undertaken: hazard assessment, vulnerability
assessment and estimation of losses. To compare the three hazard types on a consistent basis, a common economic assessment
of exposed assets was developed. This was used to calculate direct economic losses to buildings and their contents. The perils
were compared by risk curves showing the exceedence probability of the estimated losses. In Cologne, most of the losses that
occur frequently are due to floods and windstorms. For lower return periods (10–200 years) the risk is dominated by floods.
For return periods of more than 200 years the highest damage is caused by earthquakes. |
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