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| Titel |
Runoff thresholds in derived flood frequency distributions |
| VerfasserIn |
A. Gioia, V. Iacobellis, S. Manfreda, M. Fiorentino |
| 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 ; 12, no. 6 ; Nr. 12, no. 6 (2008-12-01), S.1295-1307 |
| Datensatznummer |
250010958
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| Publikation (Nr.) |
 copernicus.org/hess-12-1295-2008.pdf |
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| Zusammenfassung |
| In general, different mechanisms may be identified as responsible of runoff
generation during ordinary events or extraordinary events at the basin scale.
In a simplified scheme these mechanisms may be represented by different
runoff thresholds. In this context, the derived flood frequency model, based
on the effect of partial contributing areas on peak flow, proposed by
Iacobellis and Fiorentino (2000), was generalized by providing a new
formulation of the derived distribution where two runoff components are
explicitly considered. The model was tested on a group of basins in Southern
Italy characterized by annual maximum flood distributions highly skewed. The
application of the proposed model provided good results in terms of
descriptive ability. Model parameters were also found to be well correlated
with geomorphological basin descriptors. Two different threshold mechanisms,
associated respectively to ordinary and extraordinary events, were
identified. In fact, we found that ordinary floods are mostly due to rainfall
events exceeding a threshold infiltration rate in a small source area, while
the so-called outlier events, responsible of the high skewness of flood
distributions, are triggered when severe rainfalls exceed a threshold storage
in a large portion of the basin. |
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