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| Titel |
Evaluation of catchment contributing areas and storm runoff in flat terrain subject to urbanisation |
| VerfasserIn |
O. V. Barron, D. Pollock, W. Dawes |
| 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. 2 ; Nr. 15, no. 2 (2011-02-11), S.547-559 |
| Datensatznummer |
250012643
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| Publikation (Nr.) |
 copernicus.org/hess-15-547-2011.pdf |
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| Zusammenfassung |
| Contributing Catchment Area Analysis (CCAA) is a spatial analysis technique
developed and used for estimation of the hydrological connectivity of
relatively flat catchments. It allows accounting for the effect of relief
depressions on the catchment rainfall-runoff relationship which is not
commonly considered in hydrological modelling. Analysis of distributed
runoff was based on USDA runoff curves numbers (USDA, 1986), which utilised
the spatial information on land cover and soil types, while CCAA was further
developed to define catchment area contributing to river discharge under
individual rainfall events. The method was applied to the Southern River
catchment, Western Australia, showing that contributing catchment area
varied from less than 20% to more than 60% of total catchment area
under different rainfall and soil moisture conditions. Such variability was
attributed to a compensating effect of relief depressions. CCAA was further
applied to analyse the impact of urbanisation on the catchment
rainfall-runoff relationship. It was demonstrated that in addition to an
increase in runoff coefficient, urbanisation leads to expansion in the
catchment area contributing to the river flow. This effect was more evident
for the most frequent rainfall events, when an increase in contributing area
was responsible for a 30–100% rise in predicted catchment runoff. |
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