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| Titel |
Spatial moments of catchment rainfall: rainfall spatial organisation, basin morphology, and flood response |
| VerfasserIn |
D. Zoccatelli, M. Borga, A. Viglione, G. B. Chirico, G. Blöschl |
| 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 ; 15, no. 12 ; Nr. 15, no. 12 (2011-12-20), S.3767-3783 |
| Datensatznummer |
250013056
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| Publikation (Nr.) |
 copernicus.org/hess-15-3767-2011.pdf |
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| Zusammenfassung |
| This paper describes a set of spatial rainfall statistics (termed "spatial moments of catchment rainfall")
quantifying the dependence existing between spatial rainfall organisation,
basin morphology and runoff response. These statistics describe the spatial
rainfall organisation in terms of concentration and dispersion statistics as
a function of the distance measured along the flow routing coordinate. The
introduction of these statistics permits derivation of a simple relationship
for the quantification of catchment-scale storm velocity. The concept of the
catchment-scale storm velocity takes into account the role of relative
catchment orientation and morphology with respect to storm motion and
kinematics. The paper illustrates the derivation of the statistics from an
analytical framework recently proposed in literature and explains the
conceptual meaning of the statistics by applying them to five extreme flash
floods occurred in various European regions in the period 2002–2007. High
resolution radar rainfall fields and a distributed hydrologic model are
employed to examine how effective are these statistics in describing the
degree of spatial rainfall organisation which is important for runoff
modelling. This is obtained by quantifying the effects of neglecting the
spatial rainfall variability on flood modelling, with a focus on runoff
timing. The size of the study catchments ranges between 36 to 982 km2.
The analysis reported here shows that the spatial moments of catchment rainfall can be
effectively employed to
isolate and describe the features of rainfall spatial organization which
have significant impact on runoff simulation. These statistics provide
useful information on what space-time scales rainfall has to be monitored,
given certain catchment and flood characteristics, and what are the effects
of space-time aggregation on flood response modeling. |
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