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| Titel |
Climate and terrain factors explaining streamflow response and recession in Australian catchments |
| VerfasserIn |
A. I. J. M. Dijk |
| 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 ; 14, no. 1 ; Nr. 14, no. 1 (2010-01-27), S.159-169 |
| Datensatznummer |
250012154
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| Publikation (Nr.) |
 copernicus.org/hess-14-159-2010.pdf |
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| Zusammenfassung |
| Daily streamflow data were analysed to assess which climate and terrain
factors best explain streamflow response in 183 Australian catchments.
Assessed descriptors of catchment response included the parameters of fitted
baseflow models, and baseflow index (BFI), average quick flow and average
baseflow derived by baseflow separation. The variation in response between
catchments was compared with indicators of catchment climate, morphology,
geology, soils and land use. Spatial coherence in the residual unexplained
variation was investigated using semi-variogram techniques. A linear
reservoir model (one parameter; recession coefficient) produced baseflow
estimates as good as those obtained using a non-linear reservoir (two
parameters) and for practical purposes was therefore considered an
appropriate balance between simplicity and explanatory performance. About a
third (27–34%) of the spatial variation in recession coefficients and BFI
was explained by catchment climate indicators, with another 53% of
variation being spatially correlated over distances of 100–150 km, probably
indicative of substrate characteristics not captured by the available soil
and geology data. The shortest recession half-times occurred in the driest
catchments and were attributed to intermittent occurrence of fast-draining
(possibly perched) groundwater. Most (70–84%) of the variation in average
baseflow and quick flow was explained by rainfall and climate
characteristics; another 20% of variation was spatially correlated over
distances of 300–700 km, possibly reflecting a combination of terrain and
climate factors. It is concluded that catchment streamflow response can be
predicted quite well on the basis of catchment climate alone. The prediction
of baseflow recession response should be improved further if relevant
substrate properties were identified and measured. |
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