References

HESS

Hydrology and Earth System Sciences

HESS

Hydrol. Earth Syst. Sci.

1607-7938

Copernicus Publications

Göttingen, Germany

10.5194/hess-17-325-2013

How will climate change modify river flow regimes in Europe?

Schneider

¹ Laizé

C. L. R.

² Acreman

M. C.

² Flörke

https://orcid.org/0000-0003-2943-5289

Center for Environmental Systems Research, University of Kassel, Wilhelmshöher Allee 47, 34117 Kassel, Germany

Centre for Ecology and Hydrology, Wallingford, Maclean Building, Crowmarsh Gifford, OX10 8BB, UK

28 01 2013

17 1 325 339

2013

This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/

This article is available from https://hess.copernicus.org/articles/17/325/2013/hess-17-325-2013.html

The full text article is available as a PDF file from https://hess.copernicus.org/articles/17/325/2013/hess-17-325-2013.pdf

Worldwide, flow regimes are being modified by various anthropogenic impacts and climate change induces an additional risk. Rising temperatures, declining snow cover and changing precipitation patterns will interact differently at different locations. Consequently, in distinct climate zones, unequal consequences can be expected in matters of water stress, flood risk, water quality, and food security. In particular, river ecosystems and their vital ecosystem services will be compromised as their species richness and composition have evolved over long time under natural flow conditions. This study aims at evaluating the exclusive impacts of climate change on river flow regimes in Europe. Various flow characteristics are taken into consideration and diverse dynamics are identified for each distinct climate zone in Europe. In order to simulate present-day natural flow regimes and future flow regimes under climate change, the global hydrology model WaterGAP3 is applied. All calculations for current and future conditions (2050s) are carried out on a 5' × 5' European grid. To address uncertainty, bias-corrected climate forcing data of three different global climate models are used to drive WaterGAP3. Finally, the hydrological alterations of different flow characteristics are quantified by the Indicators of Hydrological Alteration approach. Results of our analysis indicate that on the European scale, climate change can be expected to modify flow regimes remarkably. This is especially the case in the Mediterranean (due to drier conditions with reduced precipitation across the year) and in the boreal climate zone (due to reduced snowmelt, increased precipitation, and strong temperature rises). In the temperate climate zone, impacts increase from oceanic to continental. Regarding single flow characteristics, strongest impacts on timing were found for the boreal climate zone. This applies for both high and low flows. Flow magnitudes, in turn, will be predominantly altered in the Mediterranean but also in the Northern climates. At the end of this study, typical future flow regimes under climate change are illustrated for each climate zone.

References 1

Acreman, M. C., Dunbar, M. J., Hannaford, J., Wood, P. J., Holmes, N. J., Cowx, I., Noble, R., Mountford, J. O. D., King, J., Black, A., Extence, C., Crookall, D., and Aldrick, J.: Developing environmental standards for abstractions from UK rivers to implement the Water Framework Directive, Hydrolog. Sci. J., 53, 1105–1120, 2008.

Alcamo, J., Döll, P., Henrichs, T., Kaspar, F., Lehner, B., Rösch, T., and Siebert, S.: Development and testing of the WaterGAP 2 global model of water use and availability, Hydrolog. Sci. J., 48, 317–337, 2003.

Alcamo, J., Flörke, M., and Märker, M.: Future long-term changes in global water resources driven by socio-economic and climate changes, Hydrolog. Sci. J., 52, 247–275, 2007.

Allan, J. D., Palmer, M. A., and Poff, N. L.: Climate change and freshwater ecosystems, in: Climate Change and Biodiversity, Yale University Press, New Haven CT, 272–290, 2005.

Argyroudi, A., Chatzinikolaou, Y., Poirazidis, K., and Lazaridou, M.: Do intermittent and ephermal Mediterranean rivers belong to the same river type?, Aquat. Ecol., 43, 465–476, 2009.

Arnell, N. W.: Climate change and global water resources: SRES emissions and socio-economic scenarios, Global Environ. Change, 14, 31–52, 2004.

Arnell, N. W., van Vuuren, D. P., and Isaac, M.: The implications of climate policy for the impacts of climate change on global water resources, Global Environ. Change, 21, 592–603, 2011.

aus der Beek, T. and Teichert, E.: Global Permafrost Distribution in the Past, Present and Future, Proc., 9th International Conference on Permafrost, Fairbanks, Alaska, 29 June–3 July 2008.

aus der Beek, T., Flörke, M., Lapola, D. M., Schaldach, R., Vo{ß}, F., and Teichert, E.: Modelling historical and current irrigation water demand on the continental scale: Europe, Adv. Geosci., 27, 79–85, <a href="http://dx.doi.org/10.5194/adgeo-27-79-2010">https://doi.org/10.5194/adgeo-27-79-2010</a>, 2010.

Bergstrom, S. and Carlsson, B.: Hydrology of the Baltic Basin, Swedish Meteorological and Hydrological Institute Reports, Hydrology, 7, 1–21, 1993.

Brown, J. H. and Lomolino, M. V.: Biogeography (Second Edition), Sinauer, Sunderland, USA, 1998.

Bunn, S. E. and Arthington, A. H.: Basic Principles and Ecological Consequences of Altered Flow Regimes for Aquatic Biodiversity, Springer-Verlag New York Inc., 30, 492–507, <a href="http://dx.doi.org/10.1007/s00267-002-2737-0">https://doi.org/10.1007/s00267-002-2737-0</a>, 2002.

Costanza, R., d'Arge, R., de Groot, R., Faber, S., Grasso, M., Hannon, B., Limburg, K., Naeem, S., O'Neill, R. V., Paruelo, J., Raskin, R. G., Sutton, P., and van der Belt, M.: The value of the world's ecosystems and natural capital, Nature, 387, 253–260, 1997.

Dankers, R. and Feyen, L.: Flood hazard in Europe in an ensemble of regional climate scenarios, J. Geophys. Res.-Atmos., 114, D16108, <a href="http://dx.doi.org/10.1029/2008JD011523">https://doi.org/10.1029/2008JD011523</a>, 2009.

Döll, P. and Zhang, J.: Impact of climate change on freshwater ecosystems: a global-scale analysis of ecologically relevant river flow alterations, Hydrol. Earth Syst. Sci., 14, 783–799, <a href="http://dx.doi.org/10.5194/hess-14-783-2010">https://doi.org/10.5194/hess-14-783-2010</a>, 2010.

Döll, P., Kaspar, F., and Lehner, B.: A global hydrological model for deriving water availability indicators: model tuning and validation, J. Hydrol., 270, 105–134, 2003.

Farr, T. G., Rosen, P. A., Caro, E., Crippen, R., Duren, R., Hensley, S., Kobrick, M., Paller, M., Rodriguez, E., Roth, L., Seal, D., Shaffer, S., Shimada, J., Umland, J., Werner, M., Oskin, M., Burbank, D., and Alsdorf, D.: The Shuttle Radar Topography Mission, Rev. Geophys., 45, RG2004, <a href="http://dx.doi.org/10.1029/2005RG000183">https://doi.org/10.1029/2005RG000183</a>, 2007.

Feyen, L. and Dankers, R.: Impact of global warming on streamflow drought in Europe, J. Geophys. Res.-Atmos., 114, D17116, <a href="http://dx.doi.org/10.1029/2008JD011438">https://doi.org/10.1029/2008JD011438</a>, 2009.

Flörke, M., Bärlund, I., and Kynast, E.: Will climate change affect the electricity production sector? A European study, Water Clim. Chang., 3, 44–54, <a href="http://dx.doi.org/10.2166/wcc.2012.066">https://doi.org/10.2166/wcc.2012.066</a>, 2012a.

Flörke, M., Bärlund, I., Schneider, C., and Kynast, E.: Pan-European freshwater resources in a changing environment: how will the Black Sea region develop?, Water Sci. Technol., 12.5, 563–572, 2012b.

Flörke, M., Kynast, E., Bärlund, I., Eisner, S., Wimmer, F., and Alcamo, J.: Domestic and industrial water uses of the past 60 years as a mirror of socio-economic development: A global simulation study, Global Environ. Chang., online first: <a href="http://dx.doi.org/10.1016/j.gloenvcha.2012.10.018">https://doi.org/10.1016/j.gloenvcha.2012.10.018</a>, 2012c.

Frederick, K. D. and Major, D. C.: Climate change and water resources, Climatic Change, 37, 7–23, 1997.

Georgiyevsky, V. Y., Zhuravin, S. A., and Ezhov, A. V.: Assessment of trends in hydrometeorological situation on the Great Russian Plain under the effect of climate variations, in: Proceedings of American Geophysical Union, 15th Annual Hydrology Days, 47–58, 1995.

Georgiyevsky, V. Y., Yezhov, A. V., Shalygin, A. L., Shiklomanov, A. I., and Shiklomanov, I. A.: Evaluation of possible climate change impact on hydrological regime and water resources of the former USSR rivers, Russ. Meteorol. Hydrol., 11, 89–99, 1996.

Georgiyevsky, V. Y., Yezhov, A. V., and Shalygin, A. L.: An assessment of changing river runoff due to man's impact and global climate warming, in: River Runoff Calculations, Report at the International Symposium, UNESCO, 75–81, 1997.

Giller, P. S. and Malmqvist, B.: The Biology of Streams and Rivers, Oxford, UK, Oxford University Press, 1998.

Graham, L. P., Hagemann, S., Jaun, S., and Beniston, M.: On interpreting hydrological change from regional climate models, Climatic Change, 81, 97–122, 2007.

GRDC: Long Term Mean Monthly Discharges and Annual Characteristics of Selected GRDC Stations, the Global Runoff Data Centre: Koblenz, Germany, 2004.

Grooten, M., Almond, R., and McLellan, R.: Living Planet Report 2012: biodiversity, biocapacity and better choices (WWF), available at: <a href="http://wwf.panda.org/about_our_earth/all_publications/living_planet_report/">http://wwf.panda.org/about_our_earth/all_publications/living_planet_report/</a> (last access: 27 June 2012), 2012.

Hagemann, S., Chen, C., Haerter, J. O., Heinke, J., Gerten, D., and Piani, C.: Impact of a statistical bias correction on the projected hydrological changes obtained from three GCMs and two hydrology models, J. Hydrometeorol., 12, 556–578, <a href="http://dx.doi.org/10.1175/2011JHM1336.1">https://doi.org/10.1175/2011JHM1336.1</a>, 2011.

Haines, A. T., Finlayson, B. L., and McMahon, T. A.: A global classification of river regimes, Appl. Geogr., 8, 255–272, 1988.

Hannaford, J., Laizé, C. L. R., and Marsh, T. J.: An assessment of runoff trends in natural catchments in the Celtic regions of North West Europe, in: Proceedings of the Fourth Inter-Celtic Colloquium on Hydrology and Management of Water Resources, Guimaraes, Portugal, 11–14 July 2005, IAHS Red Book, Wallingford, Oxfordshire, UK, 310, 78–85, 2007.

Hartwich, R., Thiele, S., Baritz, R., Fuchs, M., and Krug, D.: Erläuterungen zur Bodenregionenkarte der Europäischen Union und ihrer Nachbarstaaten im Ma{ß}stab 1 : 5.000.000 Version 2.0), the report additionally contains the Map of Climate Areas in Europe 1 : 15,000,000, and the Parent Material Associations Map 1 : 15,000,000. Both maps, together with the EU soil regions map, are part of the BGR digital soil data catalogue, available at: <a href="http://www.bgr.bund.de">http://www.bgr.bund.de</a> (last access: 20 January 2013), BGR, Hannover, 2006.

Hisdal, H., Stahl, K., Tallaksen, L. M., and Demuth, S.: Have streamflow droughts in Europe become more severe or frequent?, Int. J. Climatol, 21, 317–333, <a href="http://dx.doi.org/10.1002/joc.619">https://doi.org/10.1002/joc.619</a>, 2001.

IPCC: Climate Change 2007: Synthesis Report. Contribution of Working Groups I, II and III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Pachauri, R. K. and Reisinger, A., IPCC, Geneva, Switzerland, 104 pp., 2007.

Jenkins, M.: Prospects for biodiversity, Science, 302, 1175–1177, 2003.

Laizé, C. L. R., Acreman, M. C., Dunbar, M. J., Houghton-Carr, H., Flörke, M., and Schneider, C.: Monthly hydrological indicators to assess impact of change on river ecosystems at the pan-European scale: preliminary results, in: British Hydrological Society Third International Symposium Role of Hydrology in Managing Consequences of a Changing Global Environment, Newcastle upon Tyne, UK, 2010.

Laizé, C. L. R., Acreman, M. C., Schneider, C., Dunbar, M. J., Houghton-Carr, H., Flörke, M., and Hannah, D. M.: Projected flow alteration and ecological risk for pan-European rivers, River Res. Appl., online first, <a href="http://dx.doi.org/10.1002/rra.2645">https://doi.org/10.1002/rra.2645</a>, 2013.

Lehner, B., Verdin, K., and Jarvis, A.: New global hydrography derived from spaceborne elevation data, Eos T. Am. Geophys. Un., 89, 93–94, 2008.

Lloyd, N., Quinn, G., Thoms, M., Arthington, A., Gawne, B., Humphries, P., and Walker, K.: Does flow modification cause geomorphological and ecological response in rivers?, A literature review from an Australian perspective, Technical report 1/2004, CRCFE, Canberra, 2004.

Lytle, D. A. and Poff, N. L.: Adaptation to natural flow regimes, Trends Ecol. Evol., 19, 94–100, <a href="http://dx.doi.org/10.1016/j.tree.2003.10.002">https://doi.org/10.1016/j.tree.2003.10.002</a>, 2004.

Malmqvist, B. and Rundle, S.: Threats to the running water ecosystem of the world, Environ. Conserv., 29, 134–153, <a href="http://dx.doi.org/10.1017/S0376892902000097">https://doi.org/10.1017/S0376892902000097</a>, 2002.

Manning, M. R., Edmonds, J., Emori, S., Grubler, A., Hibbard, K., Joos, F., Kainuma, M., Keeling, R. F., Kram, T., Manning, A. C., Meinshausen, M., Moss, R., Nakicenovic, N., Riahi, K., Rose, S. K., Smith, S., Swart, R., and van Vuuren, D. P.: Misrepresentation of the IPCC CO<sub>2</sub> emission scenarios, Nat. Geosci., 3, 376–377, 2010.

Mathews, R. and Richter B.: Application of the Indicators of Hydrologic Alteration software in environmental flow-setting, J. Am. Water Resour. As., 43, 1400–1413, <a href="http://dx.doi.org/10.1111/j.1752-1688.2007.00099.x">https://doi.org/10.1111/j.1752-1688.2007.00099.x</a>, 2007.

Meehl, G. A., Stocker, T. F., Collins, W. D., Friedlingstein, P., Gaye, A. T., Gregory, J. M., Kitoh, A., Knutti, R., Murphy, J. M., Noda, A., Raper, S. C. B., Watterson, I. G., Weaver, A. J., and Zhao, Z. C.: Global climate projections. Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Solomon, S., Qin, D., Manning, M., Chen, Z., Marquis, M., Averyt, K. B., Tignor, M., and Miller, H. L., Cambridge University Press, Cambridge, 747–846, 2007.

Milly, P. C. D., Betancourt, J., Falkenmark, M., Hirsch, R. M., Kundzewicz, Z. W., Lettenmaier, D. P., and Stouffer, R. J.: Stationarity Is Dead: Whither Water Management?, Science, 319, 573–574, <a href="http://dx.doi.org/10.1126/science.1151915">https://doi.org/10.1126/science.1151915</a>, 2008.

Morais, M., Pinto, P., Guilherme, P., Rosado, J., and Antunes, I.: Assessment of temporary streams: the robustness of metric and multimetric indices under different hydrological conditions, Hydrobiologia, 516, 229–249, 2004.

Nilsson, C. and Renöfält, B. M.: Linking flow regime and water quality in rivers: a challenge to adaptive catchment management, Ecol. Soc., 13, available at: <a href="http://www.ecologyandsociety.org/articles/2588.html">http://www.ecologyandsociety.org/articles/2588.html</a> (last access: August 2012), 2008.

Nilsson, C., Reidy, C. A., Dynesius, M., and Revenga, C.: Fragmentation and Flow Regulation of the World's Large River Systems, Science, 308, 405–408, 2005.

Nohara, D., Kitoh, A., Hosaka, M., and Oki, T.: Impact of Climate Change on River Discharge Projected by Multimodel Ensemble, J. Hydrometeorol., 7, 1076–1089, 2006.

Norris, R. H. and Thoms, M. C.: What is river health?, Freshwater Biol., 41, 197–209, 1999.

Olden, J. D. and Poff, N. L.: Redundancy and the choice of hydrologic indices for characterizing streamflow regimes, River Res. Appl., 19, 101–121, <a href="http://dx.doi.org/10.1002/rra.700">https://doi.org/10.1002/rra.700</a>, 2003.

Oueslati, O., De Girolamo, A. M., Abouabdillah, A., and Lo Porto, A.: Attempts to flow regime classification and characterisation in mediterranean streams using multi-variate analysis, Int. Workshop Advances in Statistical Hydrology, Taormina, Italy, 23–25 May 2010, 1–15, 2010.

Palau, A. and Alcázar, J.: The basic flow method for incorporating flow variability in environmental flows, River Res. Appl., 28, 93–102, 2012.

Peel, M. C., Finlayson, B. L., and McMahon, T. A.: Updated world map of the Köppen-Geiger climate classification, Hydrol. Earth Syst. Sci., 11, 1633–1644, <a href="http://dx.doi.org/10.5194/hess-11-1633-2007">https://doi.org/10.5194/hess-11-1633-2007</a>, 2007.

Piani, C., Weedon, G. P., Best, M., Gomes, S. M., Viterbo, P., Hagemann, S., and Haerter, J. O.: Statistical bias correction of global simulated daily precipitation and temperature for the application of hydrological models, J. Hydrol., 395, 199–215, 2010.

Poff, N. L. and Zimmerman, J. K. H.: Ecological responses to altered flow regimes: a literature review to inform the science and management of environmental flows, Freshwater Biol., 55, 194–205, <a href="http://dx.doi.org/10.1111/j.1365-2427.2009.02272.x">https://doi.org/10.1111/j.1365-2427.2009.02272.x</a>, 2010.

Poff, N. L., Allan, J. D., Bain, M. B., Karr, J. R., Presteegard, K. L., Richter, B. D., Sparks, R. E., and Stromberg, G. J. C.: The natural flow regime, BioScience, 47, 769–784, 1997.

Renöfält, B. M., Jansson, R., and Nilsson C.: Effects of hydropower generation and opportunities for environmental flow management in Swedish riverine ecosystems, Freshwater Biol., 55, 49–67, <a href="http://dx.doi.org/10.1111/j.1365-2427.2009.02241.x">https://doi.org/10.1111/j.1365-2427.2009.02241.x</a>, 2010.

Ricciardi, A. and Rasmussen, J. B.: Extinction rates of North American freshwater fauna, Conserv. Biol., 13, 1220–1222, 1999.

Richter, B. D.: Re-thinking environmental flows: from allocations and reserves to sustainability boundaries, River Res. Appl., 26, 1052–1063, <a href="http://dx.doi.org/10.1002/rra.1320">https://doi.org/10.1002/rra.1320</a>, 2009.

Richter, B. D., Baumgartner, J. V., Powell, J., and Braun, D. P.: A Method for Assessing Hydrologic Alteration within Ecosystems, Conserv. Biol., 10, 1163–1174, 1996.

Richter, B. D., Baumgartner, J. V.,Wigington, R., and Braun, D. P.: How much water does a river need?, Freshwater Biol., 37, 231–249, 1997.

Richter, B. D., Davis, M. M., Apse, C., and Konrad, C.: A presumptive standard for environmental flow protection, River Res. Appl., 28, 1312–1321, <a href="http://dx.doi.org/10.1002/rra.1511">https://doi.org/10.1002/rra.1511</a>, 2012.

Robson, A. J., Jones, T. K., Reed, D. W., and Bayliss, A. C.: A study of national trend and variation in UK floods, Int. J. Climatol., 18, 165–182, 1998.

Rost, S., Gerten, D., Bondeau, A., Luncht, W., Rohwer, J., and Schaphoff, S.: Agricultural green and blue water consumption and its influence on the global water system, Water Resour. Res., 44, 1–17, <a href="http://dx.doi.org/10.1029/2007WR006331">https://doi.org/10.1029/2007WR006331</a>, 2008.

Sahin, V. and Hall, M. J.: The effects of afforestation and deforestation on water yields, J. Hydrol., 178, 293–309, 1996.

Schaldach, R., Koch, J., Aus der Beek, T., Kynast, E., and Flörke, M.: Current and future irrigation water requirements in pan-Europe: An integrated analysis of socio-economic and climate scenarios, Global Planet. Change, 94–95, 33–45, 2012.

Schneider, C., Flörke, M., Geerling, G., Duel, H., Grygoruk, M., and Okruszko, T.: The future of European floodplain wetlands under a changing climate, J. Water Clim. Change, 2, 106–122, 2011.

Strayer, D. J. and Dudgeon, D.: Freshwater biodiversity conservation: recent progress and future challenges, J. N. Am. Benthol Soc., 29, 344–358, 2010.

Suen, J. P. and Herricks, E. E.:Developing fish community based ecohydrological indicators for water resources management in Taiwan, Hydrobiologia, 625, 223–234, <a href="http://dx.doi.org/10.1007/s10750-009-9710-3">https://doi.org/10.1007/s10750-009-9710-3</a>, 2009.

Tarend, D. D.: Changing flow regimes in the Baltic States, in: Proceedings of the 2nd International Conference on Climate and Water, Espoo, Finland, August 1998, 109–117, 1998.

Taylor, V., Jewitt, G. P. W., and Schulze, R. E.: Indicators of Hydrologic Alteration for assessing environmental flows for highly variable rivers, Report commissioned by the Water Research Commission, 1155/1/04, 121–137, 2004.

Tharme, R. E. and King, J. M.: Development of the Building Block Methodology for instream flow assessments, and supporting research on the effects of different magnitude flows on riverine ecosystems, Water Research Commission Report No. 576/1/98, 452 pp., 1998.

USGS: Global Land Cover Characterization (GLCC), available at: <a href="http://edc2.usgs.gov/glcc/glcc.php">http://edc2.usgs.gov/glcc/glcc.php</a> (last access: 27 June 2012), 2008.

Vanham, D.: The Alps under climate change: implications for water management in Europe, J. Water Clim. Change, 3, 197–206, <a href="http://dx.doi.org/10.2166/wcc.2012.032">https://doi.org/10.2166/wcc.2012.032</a>, 2012.

Verzano, K.: Climate change impacts on flood related hydrological processes: Further development and application of a global scale hydrological model, Reports on Earth System Science, 71-2009, Max Planck Institute for Meteorology, Hamburg, Germany, 2009.

Verzano, K. and Menzel, L.: Snow conditions in mountains and climate change – a global view, in: Hydrology in Mountain Regions: Observations, Processes and Dynamics, IAHS-Publication, Wallingford, Oxfordshire, UK, 326, 147–154, 2009.

Verzano, K., Bärlund, I., Flörke, M., Lehner, B., Kynast, E., and Vo{ß}, F.: Modeling variable river flow velocity on continental scale: Current situation and climate change impacts in Europe, J. Hydrol., 424–425, 238–251, 2012.

Vörösmarty, C. J., McIntyre, P. B., Gessner, M. O., Dudgeon, D., Prusevich, A., Green, P., Glidden, S., Bunn, S. E., Sullivan, C. A., Reidy Liermann, C., and Davies, P. M.: Global threats to human water security and river biodiversity, Nature, 467, 555–561, <a href="http://dx.doi.org/10.1038/nature09440">https://doi.org/10.1038/nature09440</a>, 2010.

Weedon, G. P., Gomes, S., Viterbo, P., Shuttleworth, W. J., Blyth, E., Österle, H., Adam, J. C., Bellouin, N., Boucher, O., and Best, M.: Creation of the WATCH Forcing Data and its use to assess global and regional reference crop evapotranspiration over land during the twentieth century, J. Hydrometeorol., 12, 823–848, <a href="http://dx.doi.org/10.1175/2011JHM1369.1">https://doi.org/10.1175/2011JHM1369.1</a>, 2011.

Woo, M. K., Thorne, R., Szeto, K. K., and Yang, D.: Streamflow hydrology in the boreal region under the influences of climate and human interference, Philos. T. R. Soc. Lond., B, 363, 2251–2260, <a href="http://dx.doi.org/10.1098/rstb.2007.2197">https://doi.org/10.1098/rstb.2007.2197</a>, 2008.

Yin, X. A., Yang, Z. F., and Petts, G. E.: Reservoir operating rules to sustain environmental flows in regulated rivers, Water Resour. Res., 47, 1–13, <a href="http://dx.doi.org/10.1029/2010WR009991">https://doi.org/10.1029/2010WR009991</a>, 2011.

Zang, C. F., Liu, J., van der Velde, M., and Kraxner, F.: Assessment of spatial and temporal patterns of green and blue water flows under natural conditions in inland river basins in Northwest China, Hydrol. Earth Syst. Sci., 16, 2859–2870, <a href="http://dx.doi.org/10.5194/hess-16-2859-2012">https://doi.org/10.5194/hess-16-2859-2012</a>, 2012.