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| Titel |
Changes in flood frequencies in Switzerland since 1500 |
| VerfasserIn |
P. Schmocker-Fackel, F. Naef |
| 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 ; 14, no. 8 ; Nr. 14, no. 8 (2010-08-17), S.1581-1594 |
| Datensatznummer |
250012402
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| Publikation (Nr.) |
 copernicus.org/hess-14-1581-2010.pdf |
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| Zusammenfassung |
| In northern Switzerland, an accumulation of large flood events has occurred
since the 1970s, preceded by a prolonged period with few floods
(Schmocker-Fackel and Naef, 2010). How have Swiss flood frequencies changed
over the past 500 years? And how does the recent increase in flood
frequencies compare with other periods in this half millennium? We collected
historical flood data for 14 Swiss catchments dating back to 1500 AC. All
catchments experienced marked fluctuations in flood frequencies, and we were
able to identify four periods of frequent flooding in northern Switzerland,
lasting between 30 and 100 years (1560–1590, 1740–1790, 1820–1940
and since 1970). The current period of increased flood frequencies has not
yet exceeded those observed in the past. We tested whether the flood
frequency fluctuation could be explained with generalised climatic indices
like solar activity or the NAO. The first three periods of low flood
frequency in Switzerland correspond to periods of low solar activity.
However, after 1810 no relationship between solar activity and flood
frequency was found, nor could a relationship be established between
reconstructed NAO indices or reconstructed Swiss temperatures. We found
re-occurring spatial patterns of flood frequencies on a European scale, with
the Swiss periods of frequent flooding often in phase with those in the
Czech Republic, Italy and Spain and less often with those in Germany. The
pattern of flooding in northern Switzerland and the Czech Republic seem to
be rather similar, although the individual flood events do not match. This
comparison of flooding patterns in different European countries suggests
that changes in large scale atmospheric circulation are responsible for the
flood frequency fluctuations. |
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