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| Titel |
Evaluation of a scaling cascade model for temporal rain- fall disaggregation |
| VerfasserIn |
J. Olsson |
| 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 ; 2, no. 1 ; Nr. 2, no. 1, S.19-30 |
| Datensatznummer |
250000390
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| Publikation (Nr.) |
 copernicus.org/hess-2-19-1998.pdf |
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| Zusammenfassung |
| The possibility of modelling the temporal structure of
rainfall in southern Sweden by a simple cascade model is tested. The cascade model is
based on exact conservation of rainfall volume and has a branching number of 2. The
weights associated with one branching are 1 and 0 with probability P(1/0), 0 and 1 with
P(0/1), and Wx/x, and 1 - Wx/x, 0 < Wx/x, < 1, with
P(x/x), where Wx/x is associated with a theoretical probability distribution.
Furthermore, the probabilities p are assumed to depend on two characteristics of the rainy
time period (wet box) to be branched: rainfall volume and position in the rainfall
sequence. In the first step, analyses of 2 years of 8-min data indicates that the model is
applicable between approximately 1 hour and 1 week with approximately uniformly
distributed Wx/x values. The probabilities P show a clear dependence
on the box
characteristics and a slight seasonal nonstationarity. In the second step, the model is
used to disaggregate the time series from 17- to 1-hour resolution. The model-generated
data reproduce well the ratio between rainy and nonrainy periods and the distribution of
individual volumes. Event volumes, event durations, and dry period lengths are fairly well
reproduced, but somewhat underestimated, as was the autocorrelation. From analyses of
power spectrum and statistical moments the model preserves the scaling behaviour of the
data. The results demonstrate the potential of scaling-based approaches in hydrological
applications involving rainfall disaggregation. |
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