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| Titel |
Deriving global flood hazard maps of fluvial floods through a physical model cascade |
| VerfasserIn |
F. Pappenberger, E. Dutra, F. Wetterhall, H. L. Cloke |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 11 ; Nr. 16, no. 11 (2012-11-09), S.4143-4156 |
| Datensatznummer |
250013564
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| Publikation (Nr.) |
 copernicus.org/hess-16-4143-2012.pdf |
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| Zusammenfassung |
| Global flood hazard maps can be used in the assessment of flood risk in a
number of different applications, including (re)insurance and large scale
flood preparedness. Such global hazard maps can be generated using large
scale physically based models of rainfall-runoff and river routing, when used
in conjunction with a number of post-processing methods. In this study, the
European Centre for Medium Range Weather Forecasts (ECMWF) land surface model
is coupled to ERA-Interim reanalysis meteorological forcing data, and
resultant runoff is passed to a river routing algorithm which simulates
floodplains and flood flow across the global land area. The global hazard map
is based on a 30 yr (1979–2010) simulation period. A Gumbel distribution is
fitted to the annual maxima flows to derive a number of flood return periods.
The return periods are calculated initially for a 25 × 25 km grid,
which is then reprojected onto a 1 × 1 km grid to derive maps of
higher resolution and estimate flooded fractional area for the individual 25
× 25 km cells. Several global and regional maps of flood return
periods ranging from 2 to 500 yr are presented. The results compare
reasonably to a benchmark data set of global flood hazard. The developed
methodology can be applied to other datasets on a global or regional scale. |
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