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| Titel |
Investigation of dominant hydrological processes in a tropical catchment in a monsoonal climate via the downward approach |
| VerfasserIn |
L. Montanari, M. Sivapalan  , A. Montanari |
| 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 ; 10, no. 5 ; Nr. 10, no. 5 (2006-10-19), S.769-782 |
| Datensatznummer |
250008200
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| Publikation (Nr.) |
 copernicus.org/hess-10-769-2006.pdf |
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| Zusammenfassung |
| This study explores the dominant processes that may be responsible for the
observed streamflow response in Seventeen Mile Creek, a tropical catchment
located in a monsoonal climate in Northern Territory, Australia. The
hydrology of this vast region of Australia is poorly understood due to the
low level of information and gauging that are available. Any insights that
can be gained from the few well gauged catchments that do exist can be
valuable for predictions and water resource assessments in other poorly
gauged or ungauged catchments in the region. To this end, the available
rainfall and runoff data from Seventeen Mile Creek catchment are analyzed
through the systematic and progressive development and testing of
rainfall-runoff models of increasing complexity, by following the
"downward" or "top-down" approach. This procedure resulted in a multiple
bucket model (4 buckets in parallel). Modelling results suggest that the
catchment's soils and the landscape in general have a high storage capacity,
generating a significant fraction of delayed runoff, whereas saturation
excess overland flow occurs only after heavy rainfall events. The
sensitivity analyses carried out with the model with regard to soil depth
and temporal rainfall variability revealed that total runoff from the
catchment is more sensitive to rainfall variations than to soil depth
variations, whereas the partitioning into individual components of runoff
appears to be more influenced by soil depth variations. The catchment
exhibits considerable inter-annual variability in runoff volumes and the
greatest determinant of this variability turns out to be the seasonality of
the climate, the timing of the wet season, and temporal patterns of the
rainfall. The water balance is also affected by the underlying geology,
nature of the soils and the landforms, and the type, density and dynamics of
vegetation, although information pertaining to these is lacking. |
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