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| Titel |
Quantitative comparison of radar QPE to rain gauges for the 26 September 2007 Venice Mestre flood |
| VerfasserIn |
A. M. Rossa, G. Cenzon, M. Monai |
| 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 ; 10, no. 2 ; Nr. 10, no. 2 (2010-02-23), S.371-377 |
| Datensatznummer |
250007940
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| Publikation (Nr.) |
 copernicus.org/nhess-10-371-2010.pdf |
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| Zusammenfassung |
In this study consideration is given to the potential use of radar-derived
quantitative precipitation estimates (QPE) as flash flood guidance in the
context of the Italian Civil Protection flood risk management system. The
interest in high precipitation intensities and accumulation motivated the
case study of the 26 September 2007 event, in which a quasi-stationary
mesoscale convective system brought within 3–6 h 40% of the mean annual
precipitation to the wider Venice-Mestre area, i.e. 260 mm in Venice-Mestre
and 325 mm in closeby Valle Averto.
Comparison of the radar-derived QPE in the area with the rain gauge network
revealed a good correspondence for warm season rainfall, both for daily
accumulations in the longterm (about 2 years) and hourly accumulations for
the case under consideration. The long term average radar to gauge ratio is
very close to 0 dB with an uncertainty of approximately ±3 dB,
i.e. roughly a factor of two, slightly better for higher precipitation
intensities. For the hourly accumulations during this very intense event the
spread is similar, while the average is slightly positive.
The locations of the rainfall accumulation maximum as detected, respectively,
by the radar and by the rain gauge network do not coincide. Given the
relatively good quality of the precipitation estimation, it is argued that
these areas effectively have received even larger rainfall amounts, and that
it is worthwhile to further investigate the potential of radar to be used as
flash flood guidance. |
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