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| Titel |
Evaluation of water-energy balance frameworks to predict the sensitivity of streamflow to climate change |
| VerfasserIn |
M. Renner, R. Seppelt, C. Bernhofer |
| 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. 5 ; Nr. 16, no. 5 (2012-05-15), S.1419-1433 |
| Datensatznummer |
250013297
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| Publikation (Nr.) |
 copernicus.org/hess-16-1419-2012.pdf |
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| Zusammenfassung |
Long term average change in streamflow is a major concern in hydrology and
water resources management. Some simple analytical methods exist for the
assessment of the sensitivity of streamflow to climatic variations. These are
based on the Budyko hypothesis, which assumes that long term average
streamflow can be predicted by climate conditions, namely by annual average
precipitation and evaporative demand. Recently, Tomer and Schilling (2009)
presented an ecohydrological concept to distinguish between effects of
climate change and basin characteristics change on streamflow. We relate the
concept to a coupled consideration of the water and energy balance. We show
that the concept is equivalent to the assumption that the sum of the ratio of
annual actual evapotranspiration to precipitation and the ratio of actual to
potential evapotranspiration is constant, even when climate conditions are
changing.
Here, we use this assumption to derive analytical solutions to the problem of
streamflow sensitivity to climate. We show how, according to this assumption,
climate sensitivity would be influenced by different climatic conditions and
the actual hydrological response of a basin. Finally, the properties and
implications of the method are compared with established Budyko sensitivity
methods and illustrated by three case studies. It appears that the largest
differences between both approaches occur under limiting conditions.
Specifically, the sensitivity framework based on the ecohydrological concept
does not adhere to the water and energy limits, while the Budyko approach
accounts for limiting conditions by increasing the sensitivity of streamflow
to a catchment parameter encoding basin characteristics. Our findings do not
support any application of the ecohydrological concept under conditions close
to the water or energy limits, instead we suggest a correction based on the
Budyko framework. |
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