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| Titel |
Surface runoff for heavy rainfall events: results from rainfall simulations versus natural rainfall events |
| VerfasserIn |
Christian Newesely, Georg Leitinger, Erich Tasser, Martin Hollomey, Ulrike Tappeiner |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250040774
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| Zusammenfassung |
| Rainfall simulations are recognized as a state-of-the-art method that enable identification and
quantification of different runoff types, such as surface runoff, subsurface flow, and deep
percolation, as well as the analysis of rainfall-runoff transformations. However, ongoing
discussions on accuracy and contact with reality impede results’ interpretation – especially
comparability of different studies is often questioned.
In a study in the Eastern Alps, Stubai Valley, Austria, surface runoff was analyzed for
abandoned areas and pastures by rainfall simulations and collecting surface runoff from
natural rainfall events using a rain simulator and surface runoff collectors, respectively.
Runoff formation was monitored by accompanying soil water content and soil water tension
measurements as well as soil physical analyses in different soil depths. The plot size covered
by both the rainfall simulator and the surface runoff collectors was 10m2 and surface runoff
was recorded every minute. Each simulation per land-use type was replicated on at least
three different plots and three surface runoff collectors were installed nearby the
simulated plots. Simulated rainfall intensity and duration was 90 mm-1 in one hour,
corresponding to a return period of 100 years in the study area. However, by focusing on
specific duration periods, surface runoff coefficients could be compared with surface
runoff coefficients from natural precipitation events recorded by the surface runoff
collectors.
Preliminary results show varying accordance, although we tried to limit analyses to
comparable soil water content and soil water tension. However, simulated rainfall seems to
meet characteristics from a natural precipitation event and conducted rainfall simulations
turned out to be suitable and close to reality.
Our results further prove the necessity to monitor soil water content, soil water tension as
well as to analyze soil physical properties to interpret results from both rainfall simulations
and surface runoff collectors. |
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