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| Titel |
On the role of storm duration in the mapping of rainfall to flood return periods |
| VerfasserIn |
A. Viglione, G. Blöschl |
| 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 ; 13, no. 2 ; Nr. 13, no. 2 (2009-02-19), S.205-216 |
| Datensatznummer |
250011762
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| Publikation (Nr.) |
 copernicus.org/hess-13-205-2009.pdf |
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| Zusammenfassung |
| While the correspondence of rainfall return period TP and flood return
period TQ is at the heart of the design storm procedure, their
relationship is still poorly understood. The purpose of this paper is to shed
light on the controls on this relationship. To better understand the
interplay of the controlling factors we assume a simplified world with block
rainfall, constant runoff coefficient and linear catchment response. We use
an analytical derived flood frequency approach in which, following design
practise, TP is defined as the return period of the
intensity-duration-frequency (IDF) curve given storm duration and depth.
Results suggest that the main control on the mapping of rainfall to flood
return periods is the ratio of storm duration and catchment response time, as
would be expected. In the simple world assumed in this work, TQ is always
smaller or equal than TP of the associated storm, i.e.,
TQ/TP≤1. This is because of the difference in the selectiveness of
the rectangular filters used to construct the IDF curves and the unit
hydrograph (UH) together with the fact that different rectangular filters are
used when evaluating the storm return periods. The critical storm duration
that maximises TQ/TP is, in descending importance, a function of the
catchment response time and the distribution of storm duration, while the
maximum value of TQ/TP is mainly a function of the coefficient of
variation of storm duration. The study provides the basis for future
analyses, where more complex cases will be examined. |
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