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| Titel |
Assessing the sources of uncertainty associated with the calculation of rainfall kinetic energy and erosivity – application to the Upper Llobregat Basin, NE Spain |
| VerfasserIn |
G. Catari, J. Latron, F. Gallart |
| 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. 3 ; Nr. 15, no. 3 (2011-03-01), S.679-688 |
| Datensatznummer |
250012673
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| Publikation (Nr.) |
 copernicus.org/hess-15-679-2011.pdf |
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| Zusammenfassung |
| The diverse sources of uncertainty associated with the calculation of
rainfall kinetic energy and rainfall erosivity, calculated from
precipitation data, were investigated at a range of temporal and spatial
scales in a mountainous river basin (504 km2) in the south-eastern
Pyrenees. The sources of uncertainty analysed included both methodological
and local sources of uncertainty and were (i) tipping-bucket rainfall gauge
instrumental errors, (ii) the efficiency of the customary equation used to
derive rainfall kinetic energy from intensity, (iii) the efficiency of the
regressions obtained between daily precipitation and rainfall erosivity, (iv)
the temporal variability of annual rainfall erosivity values, and the
spatial variability of (v) annual rainfall erosivity values and (vi) long-term
erosivity values. The differentiation between systematic (accuracy) and
random (precision) errors was taken into account in diverse steps of the
analysis. The results showed that the uncertainty associated with the
calculation of rainfall kinetic energy from rainfall intensity at the event
and station scales was as high as 30%, because of insufficient
information on rainfall drop size distribution. This methodological
limitation must be taken into account for experimental or modelling purposes
when rainfall kinetic energy is derived solely from rainfall intensity data.
For longer temporal scales, the relevance of this source of uncertainty
remained high if low variability in the types of rain was supposed. Temporal
variability of precipitation at wider spatial scales was the main source of
uncertainty when rainfall erosivity was calculated on an annual basis,
whereas the uncertainty associated with long-term erosivity was rather low
and less important than the uncertainty associated with other model factors
such as those in the RUSLE, when operationally used for long-term soil
erosion modelling. |
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