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| Spatial pattern of the seasonality of precipitation and
floods |
The
time and space patterns of daily rainfall and flood peaks
of different magnitude were investigated
for the southwest of Germany. Directional statistics were
used to investigate the seasonality
of these variables for 215 catchments (10 to 954 km²).
Distinct spatial patterns were found,
in particular for heavy rainfall. In addition, the correlation
of heavy rainfall in different seasons
and the occurrence of atmospheric circulation patterns
were analyzed. This lead also to distinct
spatial patterns, which are widely defined by the topography,
what is the first order control of
the seasonality of precipitation and floods in the investigated
area. Finally, it could be shown,
that homogenous regions are more distinct with increasing
extremity of the flood events. This
reveals the suitability of the seasonality to define homogenous
regions for flood frequency analysis
because these regions are defined by the same dominating
processes controlling especially extreme
flood events.
Key publications:
- Uhlenbrook S., Steinbrich A., 2002: Einflussgrößen
auf die Hochwasserbildung im regionalen
Maßstab und die Saisonalität von Hochwasser
in Baden-Württemberg (Influences on the flood
generation at the regional scale and seasonality of floods
in Baden-Württemberg; in German).
Zeitschrift Wasser & Boden, 54/10, 8-15.
- Steinbrich A., Uhlenbrook S., Leibundgut Ch.,
2002: Relevance of the Seasonality of Precipitation
and Floods for Flood Estimation in Southwest Germany.
Proceedings of the International Conference
on Flood Estimation, March 6-8, 2002, Berne, Switzerland,
CHR-KHR Report II-17, 357-366.
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