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| Titel |
From regional climate simulations to the hydrological information needed for basin scale impact studies |
| VerfasserIn |
I. Portoghese, E. Bruno, M. Vurro |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 11th EGU Plinius Conference on Mediterranean Storms (2009) ; Nr. 26 (2010-06-30), S.25-31 |
| Datensatznummer |
250015976
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| Publikation (Nr.) |
 copernicus.org/adgeo-26-25-2010.pdf |
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| Zusammenfassung |
The accuracy of local downscaling of rainfall predictions provided by
climate models is crucial for the assessment of climate change impacts on
hydrological processes because the presence of bias in downscaled
precipitation may produce large bias in the assessment of soil moisture
dynamics, river flows, and groundwater recharge.
In this study, the output of a regional climate model (RCM) is downscaled
using a stochastic modelling of the point rainfall process able to
adequately reproduce the daily rainfall intermittency which is one of the
crucial aspects for the hydrological processes characterizing Mediterranean
environments. The historical time-series from a dense rain-gauge network
were used for the analysis of the RCM bias in terms of dry and wet daily
period and then to investigate the predicted alteration in the local
rainfall regime. A Poisson Rectangular Pulse (PRP) model (Rodriguez-Iturbe
et al., 1987) was finally adopted for the stochastic generation of local
daily rainfall as a continuous-time point process with forcing parameters
resulting from the bias correction of the RCM scenario. |
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