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| Titel |
Selection of historic heavy large-scale rainfall events in the Czech Republic |
| VerfasserIn |
M. Kaspar, M. Müller |
| 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 Science ; 8, no. 6 ; Nr. 8, no. 6 (2008-12-09), S.1359-1367 |
| Datensatznummer |
250005907
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| Publikation (Nr.) |
 copernicus.org/nhess-8-1359-2008.pdf |
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| Zusammenfassung |
The Central European floods of July 1997 and August 2002 spotlighted the
need for systematic research of the relationships between synoptic-scale
conditions and heavy large-scale rainfalls. Creating a set of historic
events underlies such research. We defined the criterion for their
selection, which is based on daily areal precipitation amounts in predefined
sub-regions. To stress the hydrological responses of precipitation, the
criterion expresses the temporal distribution of daily areal precipitation
in a three-day period. We applied the criterion to clusters of the Czech
Republic river basins that were affected by high areal precipitation almost
simultaneously during individual events. Finally, we selected events with
the ten highest criterion values within each cluster during the warmer
half-years from 1951 to 2006.
Regarding the spatial extent of heavy rainfalls, we identified a few events
during which a substantial part of the Czech Republic was affected. The
events include, for instance, the floods of July 1997 and August 2002 that
were unique in terms of precipitation totals. The uniqueness of the event in
2002 is that it consisted of two episodes that occurred in rapid succession
and demonstrated heavy rainfall that affected almost the same area.
Regarding the spatial distribution of precipitation, we identified several
groups of events in which heavy rainfall affected similar sub-regions of the
Czech Republic. This attribute was most likely related to similar
synoptic-scale conditions. In terms of the seasonal variability, the most
significant events were concentrated in high summer, which is typical of
orographically exposed clusters. Interannual variability of the events was
characterized by two main ten-year periods with a rather low frequency of
occurrence followed by the years with increased frequency. The analysis of
both the hydrological responses and synoptic-dynamic conditions of the
events will be the object of further research. |
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