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The Need of the Change of the Conceptualisation of Hydrologic Processes Under Extreme Conditions – Taking Reference Evapotranspiration as an Example : Volume 371, Issue 371 (12/06/2015)

By Liu, S.

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Book Id: WPLBN0004021425
Format Type: PDF Article :
File Size: Pages 6
Reproduction Date: 2015

Title: The Need of the Change of the Conceptualisation of Hydrologic Processes Under Extreme Conditions – Taking Reference Evapotranspiration as an Example : Volume 371, Issue 371 (12/06/2015)  
Author: Liu, S.
Volume: Vol. 371, Issue 371
Language: English
Subject: Science, Proceedings, International
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Mo, X., Tan, L., Zhang, S., & Liu, S. (2015). The Need of the Change of the Conceptualisation of Hydrologic Processes Under Extreme Conditions – Taking Reference Evapotranspiration as an Example : Volume 371, Issue 371 (12/06/2015). Retrieved from

Description: Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research (IGSNRR), Chinese Academy of Science (CAS), Beijing, 100101, China. What a hydrological model displays is the relationships between the output and input in daily, monthly, yearly and other temporal scales. In the case of climate change or other environment changes, the input of the hydrological model may show a gradual or abrupt change. There have been numerous documented studies to explore the response of output of the hydrological models to the change of the input with scenario simulation. Most of the studies assumed that the conceptualisation of hydrologic processes will remain, which may be true for the gradual change of the input. However, under extreme conditions the conceptualisation of hydrologic processes may be completely changed. Taking an example of the Allen's formula to calculate crop reference evapotranspiration (ET0) as a simple hydrological model, we analyze the alternation of the extreme in ET0 from 1955 to 2012 at the Chongling Experimental Station located in Hebei Province, China. The relationships between ET0 and the meteorological factors for the average values, minimum (maximum) values at daily, monthly and annual scales are revealed. It is found the extreme of the output can follow the extreme of the input better when their relationship is more linear. For non-liner relationship, the extreme of the input cannot at all be reflected from the extreme of the output. Relatively, extreme event at daily scale is harder to be shown than that at monthly scale. The result implicates that a routine model may not be able to catch the response to extreme events and it is even more so as we extrapolate models to higher temperature/CO2 conditions in the future. Some possible choices for the improvements are suggested for predicting hydrological extremes.

The need of the change of the conceptualisation of hydrologic processes under extreme conditions – taking reference evapotranspiration as an example

Allen, R. G., Pereira, L. S., Raes, D., and Smith, M.: Crop evapotranspiration-Guidelines for computing crop water requirements-FAO Irrigation and drainage paper 56, FAO, Rome, 300, 6541, 1998.; Blöschl, G., Sivapalan, M., and Wagener, T. (Eds.): Runoff prediction in ungauged basins: Synthesis across processes places and scales, Cambridge University Press, Britain, 2013.; IPCC 2013: Climate Change 2013, The Physical Science Basis, Summary for Policymakers, in: Working Group I Contribution to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Stocker, T. F., Qin, D., Plattner, G.-K., Tignor, M., Allen, S. K., Boschung, J., Nauels, A., Xia, Y., Bex, V., and Midgley, P. M., the IPCC, Switzerland, p. 18, 2013.; Liu, S. X., Mo, X. G., Xia, J., Liu, C. M., and Ji, L. N.: The uncertainty analysis of the wetted perimeter method via axis scaling for setting minimum ecological in-stream flow requirements, Publ. No. 322, IAHS, Wallingford, UK, 193–198. 2008.; Zhang, S. H., Liu, S. X., Mo, X. G., Shu, C., Sun, Y., and Zhang, C.: Assessing the impact of Climate Change on reference evapotranspiration in Aksu river basin, J. Geogr. Sci., 65, 1363–1370, 2010.


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