 |
| Titel |
An observational and numerical study of a flash-flood event over south-eastern Italy |
| VerfasserIn |
M. M. Miglietta, A. Regano |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 8, no. 6 ; Nr. 8, no. 6 (2008-12-15), S.1417-1430 |
| Datensatznummer |
250005913
|
| Publikation (Nr.) |
 copernicus.org/nhess-8-1417-2008.pdf |
|
|
|
|
|
| Zusammenfassung |
| A flash-flood episode affecting a small area in Apulia (south-eastern Italy)
on 22 October 2005 is documented. A rainfall amount of 160 mm was recorded
in a 6 h interval in the central part of the region, producing severe damage
and causing six fatalities. Synoptic maps, observations from surface stations
and remote-sensing data are used here to describe the evolution of the
rainfall system. The vertical profiles show features similar to those
observed in other orographic heavy-rain events, such as a low-level jet, a
conditionally unstable environment, and a nearly saturated warm low-level air
mass. The low hills in the centre of the region play an important role in the
release of the instability and the localisation of the rainfall, providing
the uplift necessary to the air parcels to reach the level of free
convection. Numerical simulations are performed in order to understand the
mechanisms responsible for the heavy rain event. The Weather Research and
Forecasting model (WRF) is setup in a 2-way nesting configuration including
two domains. The model is able to realistically simulate the evolution of the
precipitation system and to capture fairly well the localisation, the amount
and the timing of the rainfall. The simulations suggest the important synergy
of low and upper-tropospheric features which act as the triggering mechanism
for the development of convection. A sensitivity experiment confirms the
importance of the orography for the development of convective cells. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|