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| Titel |
A spatiotemporal multi-hazard exposure assessment based on property data |
| VerfasserIn |
S. Fuchs, M. Keiler, A. Zischg |
| 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. 9 ; Nr. 15, no. 9 (2015-09-25), S.2127-2142 |
| Datensatznummer |
250119687
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| Publikation (Nr.) |
 copernicus.org/nhess-15-2127-2015.pdf |
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| Zusammenfassung |
The paper presents a nation-wide spatially explicit object-based assessment
of buildings and citizens exposed to natural hazards in Austria, including
river flooding, torrential flooding, and snow avalanches. The assessment was
based on two different data sets, (a) hazard information providing input to
the exposure of elements at risk, and (b) information on the building stock
combined from different spatial data available on the national level. Hazard
information was compiled from two different sources. For torrential flooding
and snow avalanches available local-scale hazard maps were used, and for
river flooding the results of the countrywide flood modelling eHORA were
available. Information on the building stock contained information on the
location and size of each building, as well as on the building category and
the construction period. Additional information related to the individual
floors, such as their height and net area, main purpose and configuration,
was included for each property. Moreover, this data set has an interface to
the population register and allowed, therefore, for retrieving the number of
primary residents for each building. With the exception of sacral buildings,
an economic module was used to compute the monetary value of buildings using
(a) the information of the building register such as building type, number
of storeys and utilisation, and (b) regionally averaged construction costs.
It is shown that the repeatedly stated assumption of increasing exposure due
to continued population growth and related increase in assets has to be
carefully evaluated by the local development of building stock. While some
regions have shown a clearly above-average increase in assets, other regions
were characterised by a below-average development. This mirrors the
topography of the country, but also the different economic activities. While
hotels and hostels are extraordinarily prone to torrential flooding,
commercial buildings as well as buildings used for recreational purposes are
considerably exposed to river flooding. Residential buildings have shown an
average exposure, compared to the number of buildings of this type in the
overall building stock. In sum, around 5 % of all buildings are exposed
to torrential flooding, and around 9 % to river flooding, with around
1 % of the buildings stock being multi-exposed. The temporal assessment of
exposure has shown considerable differences in the dynamics of exposure to
different hazard categories in comparison to the overall property stock. In
conclusion, the presented object-based assessment is an important and
suitable tool for nation-wide exposure assessment and may be used in
operational risk management. |
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