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| Titel |
Hydrologic similarity among catchments under variable flow conditions |
| VerfasserIn |
S. Patil, M. Stieglitz |
| 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 (2011-03-23), S.989-997 |
| Datensatznummer |
250012695
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| Publikation (Nr.) |
 copernicus.org/hess-15-989-2011.pdf |
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| Zusammenfassung |
| An assessment of regional similarity in catchment stream response is often
needed for accurate predictions in ungauged catchments. However, it is not
clear whether similarity among catchments is preserved at all flow
conditions. We address this question through the analysis of flow duration
curves for 25 gauged catchments located across four river basins in the
northeast United States. The coefficient of variation of streamflow
percentiles is used as a measure of variability among catchments across flow
conditions. Results show that similarity in catchment stream response is
dynamic and highly dependent on flow conditions. Specifically, within each
of the four basins, the coefficient of variation is high at low flow
percentiles and gradually reduces for higher flow percentiles. Analysis of
the inter-annual variation in streamflow percentiles shows a similar
reduction in variability from low flow to high flow percentiles. Greater
similarity in streamflows is observed during the winter and spring (wet)
seasons compared to the summer and fall (dry) seasons. Results suggest that
the spatial variability in streamflow at low flows is primarily controlled
by the dominance of high evaporative demand during the warm period. On the
other hand, spatial variability at high flows during the cold period is
controlled by the increased dominance of precipitation input over
evapotranspiration. By evaluating variability over the entire range of
streamflow percentiles, this work explores the nature of hydrologic
similarity from a seasonal perspective. |
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