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Climate Change Effects on Irrigation Demands and Minimum Stream Discharge: Impact of Bias-correction Method : Volume 16, Issue 12 (17/12/2012)

By Rasmussen, J.

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Book Id: WPLBN0004010641
Format Type: PDF Article :
File Size: Pages 17
Reproduction Date: 2015

Title: Climate Change Effects on Irrigation Demands and Minimum Stream Discharge: Impact of Bias-correction Method : Volume 16, Issue 12 (17/12/2012)  
Author: Rasmussen, J.
Volume: Vol. 16, Issue 12
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Seaby, L. P., Sonnenborg, T. O., Hinsby, K., Stisen, S., B. Christense, B. S., & Rasmussen, J. (2012). Climate Change Effects on Irrigation Demands and Minimum Stream Discharge: Impact of Bias-correction Method : Volume 16, Issue 12 (17/12/2012). Retrieved from

Description: Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark. 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.

Climate change effects on irrigation demands and minimum stream discharge: impact of bias-correction method

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