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| Titel |
Design flood hydrographs from the relationship between flood peak and volume |
| VerfasserIn |
L. Mediero, A. Jiménez-Álvarez, L. Garrote |
| 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 ; 14, no. 12 ; Nr. 14, no. 12 (2010-12-10), S.2495-2505 |
| Datensatznummer |
250012527
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| Publikation (Nr.) |
 copernicus.org/hess-14-2495-2010.pdf |
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| Zusammenfassung |
| Hydrological frequency analyses are usually focused on flood peaks. Flood
volumes and durations have not been studied as extensively, although there
are many practical situations, such as when designing a dam, in which the
full hydrograph is of interest. A flood hydrograph may be described by a
multivariate function of the peak, volume and duration. Most standard
bivariate and trivariate functions do not produce univariate three-parameter
functions as marginal distributions, however, three-parameter functions are
required to fit highly skewed data, such as flood peak and flood volume
series. In this paper, the relationship between flood peak and hydrograph
volume is analysed to overcome this problem. A Monte Carlo experiment was
conducted to generate an ensemble of hydrographs that maintain the
statistical properties of marginal distributions of the peaks, volumes and
durations. This ensemble can be applied to determine the Design Flood
Hydrograph (DFH) for a reservoir, which is not a unique hydrograph, but
rather a curve in the peak-volume space. All hydrographs on that curve have
the same return period, which can be understood as the inverse of the
probability to exceed a certain water level in the reservoir in any given
year. The procedure can also be applied to design the length of the spillway
crest in terms of the risk of exceeding a given water level in the
reservoir. |
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