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| Titel |
Debris flows in the eastern Italian Alps: seasonality and atmospheric circulation patterns |
| VerfasserIn |
E. I. Nikolopoulos, M. Borga, F. Marra, S. Crema, L. Marchi |
| 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. 3 ; Nr. 15, no. 3 (2015-03-27), S.647-656 |
| Datensatznummer |
250119378
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| Publikation (Nr.) |
 copernicus.org/nhess-15-647-2015.pdf |
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| Zusammenfassung |
| The work examines the seasonality and large-scale atmospheric circulation
patterns associated with debris-flow occurrence in the Trentino–Alto Adige
region (eastern Italian Alps). Analysis is based on classification
algorithms applied to a uniquely dense archive of debris flows and hourly
rain gauge precipitation series covering the period 2000–2009. Results
highlight the seasonal and synoptic forcing patterns linked to debris flows
in the study area. Summer and fall season account for 92% of the debris
flows in the record, while atmospheric circulation characterized by zonal
west, mixed and meridional south and southeast (SE–S) patterns account for 80%.
Both seasonal and circulation patterns exhibit geographical preference. In
the case of seasonality, there is a strong north–south separation of
summer–fall dominance, while spatial distribution of dominant circulation
patterns exhibits clustering, with both zonal west and mixed patterns prevailing in
the northwest and central east part of the region, while the southern part
relates to meridional south and southeast pattern. Seasonal and synoptic
pattern dependence is pronounced also on the debris-flow-triggering rainfall
properties. Examination of rainfall intensity–duration thresholds derived
for different data classes (according to season and synoptic pattern)
revealed a distinct variability in estimated thresholds. These findings
imply a certain control on debris-flow events and can therefore be used to
improve existing alert systems. |
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