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| Titel |
Modeling the effect of glacier recession on streamflow response using a coupled glacio-hydrological model |
| VerfasserIn |
B. S. Naz, C. D. Frans, G. K. C. Clarke, P. Burns, D. P. Lettenmaier |
| 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 ; 18, no. 2 ; Nr. 18, no. 2 (2014-02-27), S.787-802 |
| Datensatznummer |
250120291
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| Publikation (Nr.) |
 copernicus.org/hess-18-787-2014.pdf |
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| Zusammenfassung |
| We describe an integrated spatially distributed hydrologic and glacier
dynamic model, and use it to investigate the effect of glacier recession on
streamflow variations for the upper Bow River basin, a tributary of the
South Saskatchewan River, Alberta, Canada. Several recent studies have
suggested that observed decreases in summer flows in the South Saskatchewan
River are partly due to the retreat of glaciers in the river's headwaters.
Modeling the effect of glacier changes on streamflow response in river
basins such as the South Saskatchewan is complicated due to the inability of
most existing physically based distributed hydrologic models to represent
glacier dynamics. We compare predicted variations in glacier extent, snow
water equivalent (SWE), and streamflow discharge
with satellite estimates of glacier area and terminus position, observed
glacier mass balance, observed streamflow and snow water-equivalent
measurements, respectively over the period of 1980–2007. Observations of multiple
hydroclimatic variables compare well with those simulated with the coupled
hydrology-glacier model. Our results suggest that, on average, the glacier
melt contribution to the Bow River flow upstream of Lake Louise is
approximately 22% in summer. For warm and dry years, however, the glacier melt
contribution can be as large as 47% in August, whereas for cold years, it
can be as small as 15% and the timing of the glacier melt signature can be
delayed by a month. The development of this modeling approach sets the stage
for future predictions of the influence of warming climate on streamflow in
partially glacierized watersheds. |
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