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| Titel |
Climate change effects on irrigation demands and minimum stream discharge: impact of bias-correction method |
| VerfasserIn |
J. Rasmussen, T. O. Sonnenborg, S. Stisen, L. P. Seaby, B. S. B. Christensen, K. Hinsby |
| 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. 12 ; Nr. 16, no. 12 (2012-12-17), S.4675-4691 |
| Datensatznummer |
250013612
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| Publikation (Nr.) |
 copernicus.org/hess-16-4675-2012.pdf |
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| Zusammenfassung |
| Climate changes are expected to result in a warmer global climate, with
increased inter-annual variability. In this study, the possible impacts of
these climate changes on irrigation and low stream flow are investigated
using a distributed hydrological model of a sandy catchment in western
Denmark. The IPCC climate scenario A1B was chosen as the basis for the
study, and meteorological forcings (precipitation, reference
evapotranspiration and temperature) derived from the ECHAM5-RACMO regional
climate model for the period 2071–2100 was applied to the model. Two bias
correction methods, delta change and Distribution-Based Scaling, were used
to evaluate the importance of the bias correction method. Using the annual
irrigation amounts, the 5-percentile stream flow, the median minimum stream
flow and the mean stream flow as indicators, the irrigation and the stream
flow predicted using the two methods were compared. The study found that
irrigation is significantly underestimated when using the delta change
method, due to the inability of this method to account for changes in
inter-annual variability of precipitation and reference ET and the resulting
effects on irrigation demands. However, this underestimation of irrigation
did not result in a significantly higher summer stream flow, because the
summer stream flow in the studied catchment is controlled by the winter and
spring recharge, rather than the summer precipitation. Additionally, future
increases in CO2 are found to have a significant effect on both
irrigation and low flow, due to reduced transpiration from plants. |
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