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| Titel |
Analysis of flash flood regimes in the North-Western and South-Eastern Mediterranean regions |
| VerfasserIn |
P. Tarolli, M. Borga, E. Morin, G. Delrieu |
| 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 ; 12, no. 5 ; Nr. 12, no. 5 (2012-05-03), S.1255-1265 |
| Datensatznummer |
250010795
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| Publikation (Nr.) |
 copernicus.org/nhess-12-1255-2012.pdf |
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| Zusammenfassung |
| This work analyses the prominent characteristics of flash flood regimes in
two Mediterranean areas: the North-Western Mediterranean region, which
includes Catalonia, France and Northern Italy, and the South-Eastern
Mediterranean region, which includes Israel. The two regions are
characterized by similarities in the hydro-meteorological monitoring
infrastructure, which permits us to ensure homogeneity in the data collection
procedures. The analysis is articulated into two parts. The first part is
based on use of flood peak data, catchment area and occurrence date for 99 events (69 from the North-Western region and 30 from the South-Eastern
region). Analysis is carried out in terms of relationship of flood peaks
with catchment area and seasonality. Results show that the envelope curve
for the South-Eastern region exhibits a more pronounced decreasing with
catchment size with respect to the curve of the North-Western region. The
differences between the two relationships reflect changes in the effects of
storm coverage and hydrological characteristics between the two regions.
Seasonality analysis shows that the events in the North-Western region tend
to occur between August and November, whereas those in the South-Eastern area
tend to occur in the period between October and May, reflecting the relevant
patterns in the synoptic conditions leading to the intense precipitation
events. In the second part, the focus is on the rainfall-runoff
relationships for 13 selected major flash flood events (8 from the
North-Western area and 5 from the South-Eastern area) for which rainfall and
runoff properties are available. These flash floods are characterised in
terms of climatic features of the impacted catchments, duration and amount
of the generating rainfall, and runoff ratio. Results show that the rainfall
duration is shorter and the rainfall depth lower in the South-Eastern region.
The runoff ratios are rather low in both regions, whereas they are more
variable in the South-Eastern area. No clear relationship between runoff
ratio and rainfall depth is observed in the sample of floods, showing the
major influence of rainfall intensity and the initial wetness condition in the
runoff generation for these events. |
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