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Impacts of Impervious Cover, Water Withdrawals, and Climate Change on River Flows in the Conterminous US : Volume 9, Issue 4 (02/04/2012)

By Caldwell, P. V.

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Book Id: WPLBN0004013293
Format Type: PDF Article :
File Size: Pages 42
Reproduction Date: 2015

Title: Impacts of Impervious Cover, Water Withdrawals, and Climate Change on River Flows in the Conterminous US : Volume 9, Issue 4 (02/04/2012)  
Author: Caldwell, P. V.
Volume: Vol. 9, Issue 4
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Mcnulty, S. G., Cohen, E. C., Sun, G., Caldwell, P. V., & Moore Myers, J. A. (2012). Impacts of Impervious Cover, Water Withdrawals, and Climate Change on River Flows in the Conterminous US : Volume 9, Issue 4 (02/04/2012). Retrieved from http://community.worldlibrary.net/


Description
Description: USDA Forest Service Eastern Forest Environmental Threat Assessment Center, Raleigh, NC, USA. Rivers are essential to aquatic ecosystem and societal sustainability, but are increasingly impacted by water withdrawals, land use change, and climate change. The relative and cumulative effects of these stressors on continental river flows are relatively unknown. In this study, we used an integrated water balance and flow routing model to evaluate the impacts of 2010 impervious cover and water withdrawal on river flow across the Conterminous US at the 8-digit Hydrologic Unit Code (HUC) watershed scale. We then estimated the impacts of projected change in withdrawals, impervious cover, and climate under the B1 low and A2 high emission scenarios on river flows by 2060. Our results suggest that compared to no impervious cover, 2010 levels of impervious cover increased river flows by 9.9% on average with larger impacts in and downstream of major metropolitan areas. In contrast, compared to no water withdrawals, 2010 withdrawals decreased river flows by 1.4% on average with larger impacts in heavily irrigated arid regions of Western US. By 2060, impacts of climate change were predicted to overwhelm the potential gain in river flow due to future changes in impervious cover and add to the potential reduction in river flows from withdrawals, decreasing mean annual river flows from 2010 levels by 16% on average. However, increases in impervious cover by 2060 may offset the impact of climate change during the growing season in some watersheds. Large water withdrawals will aggravate the predicted impact of climate change on river flows, particularly in the Western US. Given that the impacts of land use, withdrawals and climate may be either additive or offsetting in different magnitudes, integrated and spatially explicit modelling and management approaches are necessary to effectively manage water resources for aquatic life and human use in the face of global change.

Summary
Impacts of impervious cover, water withdrawals, and climate change on river flows in the Conterminous US

Excerpt
Alcamo, J., Döll, P., Henrichs, T., Kaspar, F, Lehner, B., Rösch, T., Siebert, S.: Global estimates of water withdrawals and availability under current and future business-as-usual conditions, Hydrol. Sci. J., 48, 339–348, doi:10.1623/hysj.48.3.339.45278, 2003.; Anderson, R. M., Koren, V., and Reed, S.: Using SSURGO data to improve Sacramento Model a priori parameter estimates, J. Hydrol., 320, 103–116, j.jhydrol.2005.07.020>doi:10.1016/j.jhydrol.2005.07.020, 2006.; Arnell, N. W.: Climate change and global water resources, Global Environ. Change, 9, S31–S49, doi:10.1016/S0959-3780(99)00017-5, 1999.; Averyt, K., Fisher, J., Huber-Lee, A., Lewis, A., Macknick, J., Madden, N., Rogers, J., and Tellinghuisen, S.: Freshwater use by US power plants: electricity's thirst for a precious resource, A report of the Energy and Water in a Warming World initiative, Cambridge, MA, Union of Concerned Scientists, 2011.; Bates, B. C., Kundzewicz, Z. W., Wu, S., and Palutikof, J. P. (Eds.): Climate Change and Water, Technical Paper of the Intergovernmental Panel on Climate Change, IPCC Secretariat, Geneva, 2008.; Biemans, H., Haddeland, I., Kabat, P., Ludwig, F., Hutjes, R. W. A., Heinke, J., von Bloh, W., and Gerten, D.: Impact of reservoirs on river discharge and irrigation water supply during the 20th century, Water Resour. Res., 47, W03509, doi:10.1029/2009WR008929, 2011.; Bierwagen, B. G., Theobald, D. M., Pyke, C. R., Choate, A., Groth, P., Thomas, J. V., and Morefield, P.: National housing and impervious surface scenarios for integrated climate impact assessments, P. Natl. Acad. Sci. USA, 107, 20887–20892, doi:10.1073/pnas.1002096107, 2010.; Burnash, R. J. C., Ferral, R. L., and McGuire, R. A.: A generalized streamflow simulation system – conceptual modeling for digital computers, Technical Report, Joint Federal and State River Forecast Center, 204 pp., US National Weather Service and California Department of Water Resources, Sacramento, CA, 1973.; Burnash, R. J. C.: The NWS river forecast system – catchment modeling, in: Computer Models of Watershed Hydrology, edited by: Singh, V. P., Water Resources Publications, Littleton, Colorado, 311–366, 1995.; Caldwell, P., Sun, G., McNulty, S., Cohen, E., and Moore Myers, J.: Modeling Impacts of Environmental Change on Ecosystem Services across the Conterminous United States, in: Proceedings of the Fourth Interagency Conference on Research in the Watersheds, Fairbanks, Alaska, 26–30 September 2011, 63–69, 2011.; Carlisle, D. M., Wolock D. M., and Meador M. R.: Alteration of streamflow magnitudes, and potential ecological consequences: a multiregional assessment, Front. Ecol. Environ., 9, 264–270, doi:10.1890/100053, 2011.; Daly, C., Neilson, R. P., and Phillips, D. L.: A statistical-topographic model for mapping climatological precipitation over mountainous terrain, J. Appl. Meteorol.


 

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