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| Titel |
Climatic impacts on the runoff generation processes in British Columbia, Canada |
| VerfasserIn |
A. Loukas, L. Vasiliades, N. R. Dalezios |
| 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 ; 6, no. 2 ; Nr. 6, no. 2, S.211-228 |
| Datensatznummer |
250003455
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| Publikation (Nr.) |
 copernicus.org/hess-6-211-2002.pdf |
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| Zusammenfassung |
| The potential impact of
future climate change on runoff generation processes in two southern British
Columbia catchments was explored using the Canadian Centre for Climate Modelling
Analysis General Circulation Model (CGCMa1) to estimate future changes in
precipitation, temperature and cloud cover while the U.B.C. Watershed Model was
used to simulate discharges and quantify the separate runoff components, i.e.
rainfall, snowmelt, glacier melt and groundwater. Changes, not only in
precipitation and temperature but also in the spatial distribution of
precipitation with elevation, cloud cover, glacier extension, altitude
distribution of vegetation, vegetation biomass production and plant physiology
were considered. The future climate of the catchments would be wetter and warmer
than the present. In the maritime rain-fed catchment of the Upper Campbell,
runoff from rainfall is the most significant source of flow for present and
future climatic conditions in the autumn and winter whereas runoff from
groundwater generates the flow in spring and summer, especially for the future
climate scenario. The total runoff, under the future climatic conditions, would
increase in the autumn and winter and decrease in spring and summer. In
contrast, in the interior snow-covered Illecillewaet catchment, groundwater is
the most significant runoff generation mechanism in the autumn and winter
although, at present, significant flow is generated from snowmelt in spring and
from glacier runoff in summer. In the future scenario, the contribution to flow
from snowmelt would increase in winter and diminish in spring while the runoff
from the glacier would remain unchanged; groundwater would then become the most
significant source of runoff, which would peak earlier in the season.
Keywords: climatic change, hydrological simulation, rainfall, snowmelt,
runoff processes |
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