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| Titel |
Controls on hydrologic similarity: role of nearby gauged catchments for prediction at an ungauged catchment |
| 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 ; 16, no. 2 ; Nr. 16, no. 2 (2012-02-23), S.551-562 |
| Datensatznummer |
250013182
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| Publikation (Nr.) |
 copernicus.org/hess-16-551-2012.pdf |
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| Zusammenfassung |
| Prediction of streamflow at ungauged catchments requires transfer of
hydrologic information (e.g., model parameters, hydrologic indices,
streamflow values) from gauged (donor) to ungauged (receiver) catchments. A
common metric used for the selection of ideal donor catchments is the
spatial proximity between donor and receiver catchments. However, it is not
clear whether information transfer among nearby catchments is suitable
across a wide range of climatic and geographic regions. We examine this
issue using the data from 756 catchments within the continental United
States. Each catchment is considered ungauged in turn and daily streamflow
is simulated through distance-based interpolation of streamflows from
neighboring catchments. Results show that distinct geographic regions exist
in US where transfer of streamflow values from nearby catchments is useful
for retrospective prediction of daily streamflow at ungauged catchments.
Specifically, the high predictability catchments (Nash-Sutcliffe efficiency
NS > 0.7) are confined to the Appalachian Mountains in eastern US, the
Rocky Mountains, and the Cascade Mountains in the Pacific Northwest. Low
predictability catchments (NS < 0.3) are located mostly in the drier
regions west of Mississippi river, which demonstrates the limited utility of
gauged catchments in those regions for predicting at ungauged basins. The
results suggest that high streamflow similarity among nearby catchments (and
therefore, good predictability at ungauged catchments) is more likely in
humid runoff-dominated regions than in dry evapotranspiration-dominated
regions. We further find that higher density and/or closer distance of
gauged catchments near an ungauged catchment does not necessarily guarantee
good predictability at an ungauged catchment. |
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