Rainfall downscaling in a space-time multifractal framework
| dc.contributor.author | Deidda, Roberto | |
| dc.date.accessioned | 2014-06-13T07:15:51Z | |
| dc.date.available | 2014-06-13T07:15:51Z | |
| dc.date.issued | 2010-07-09 | |
| dc.description | Publication History: Issue published online: 9 JUL 2010 Article first published online: 9 JUL 2010 Manuscript Accepted: 17 FEB 2000 Manuscript Received: 18 AUG 1999 | IT |
| dc.description.abstract | A space-time multifractal analysis on radar rainfall sequences selected from the Global Atmospheric Research Program Atlantic Tropical Experiment database is presented. It is shown that space-time rainfall can be considered with a good approximation to be a self-similar multifractal process, so that a multifractal analysis can be carried out assuming Taylor's hypothesis to hold for rainfall over a wide range of spatial and temporal scales. The advection velocity needed to rescale the time dimension is estimated using different tracking techniques. On each selected rainfall sequence, a very good scaling is observed for spatial scales ranging from 4 to 256 km and for timescales from 15 min to 16 hours. A recently developed scale-covariant multifractal model is then reformulated for numerical simulation of space-time rainfall fields. The two parameters of the log-Poisson distribution used as cascade generator within the model are systematically estimated from each selected rainfall sequence, and the dependence of one of these parameters on the large-scale rain rate is highlighted. The model is then applied to disaggregate large-scale rainfall, and some comparisons between synthetically downscaled and observed rainfall are discussed. | IT |
| dc.description.pagenumber | 1779–1794 | IT |
| dc.description.status | Pubblicato | IT |
| dc.identifier.doi | 10.1029/2000WR900038 | IT |
| dc.identifier.issn | 1944-7973 | |
| dc.identifier.uri | http://hdl.handle.net/11050/1013 | |
| dc.language.iso | en | IT |
| dc.publisher | Wiley | IT |
| dc.relation.ispartof | Water resources research | IT |
| dc.relation.ispartofseries | 36;7 | |
| dc.subject | radar rainfall | IT |
| dc.subject | log-Poisson distribution | IT |
| dc.subject | multifractal analysis | IT |
| dc.subject.een-cordis | EEN CORDIS::FISICA E SCIENZE ESATTE::Meteorologia / climatologia::Biosensori | IT |
| dc.title | Rainfall downscaling in a space-time multifractal framework | IT |
| dc.type | Articolo | IT |