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| Titel |
Modulation of homogeneous space-time rainfall cascades to account for orographic influences |
| VerfasserIn |
M. G. Badas, R. Deidda, E. Piga |
| 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 ; 6, no. 3 ; Nr. 6, no. 3 (2006-06-06), S.427-437 |
| Datensatznummer |
250003506
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| Publikation (Nr.) |
 copernicus.org/nhess-6-427-2006.pdf |
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| Zusammenfassung |
| The development of efficient space-time rainfall downscaling
procedures is highly important for the implementation of a
meteo-hydrological forecasting chain operating over small watersheds.
Multifractal models based on homogeneous cascade have been
successfully applied in literature to reproduce space-time rainfall
events retrieved over ocean, where the hypothesis of spatial homogeneity
can be reasonably accepted.
The feasibility to apply this kind of models to rainfall fields
occurring over a mountainous region, where spatial homogeneity may
not hold, is herein investigated.
This issue is examined through the analysis of rainfall
data retrieved by the high temporal resolution rain gage network of
the Sardinian Hydrological Survey.
The proposed procedure involves the introduction of a modulating
function which is superimposed to homogeneous and isotropic synthetic
fields to take into account the spatial heterogeneity detected in observed
precipitation events.
Specifically the modulating function, which reproduces the differences
in local mean values of the precipitation intensity probability distribution,
has been linearly related to the terrain elevation of the analysed spatial domain.
Comparisons performed between observed and synthetic data show how
the proposed procedure preserves the observed rainfall fields features
and how the introduction of the modulating function improves the reproduction
of spatial heterogeneity in rainfall probability distributions. |
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