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Dams on Mekong Tributaries as Significant Contributors of Hydrological Alterations to the Tonle Sap Floodplain in Cambodia : Volume 11, Issue 2 (18/02/2014)

By Arias, M. E.

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Book Id: WPLBN0004012021
Format Type: PDF Article :
File Size: Pages 33
Reproduction Date: 2015

Title: Dams on Mekong Tributaries as Significant Contributors of Hydrological Alterations to the Tonle Sap Floodplain in Cambodia : Volume 11, Issue 2 (18/02/2014)  
Author: Arias, M. E.
Volume: Vol. 11, Issue 2
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Cochrane, T. A., Piman, T., Lauri, H., Arias, M. E., & Kummu, M. (2014). Dams on Mekong Tributaries as Significant Contributors of Hydrological Alterations to the Tonle Sap Floodplain in Cambodia : Volume 11, Issue 2 (18/02/2014). Retrieved from http://hawaiilibrary.net/


Description
Description: Department of Civil and Natural Resources Engineering, University of Canterbury, Christchurch, New Zealand. River tributaries have a key role in the biophysical functioning of the Mekong Basin. Of particular attention are the Sesan, Srepok, and Sekong (3S) rivers, which contribute nearly a quarter of the total Mekong discharge. Forty two dams are proposed in the 3S, and once completed they will exceed the active storage of China's large dam cascade in the upper Mekong. Given their proximity to the lower Mekong floodplains, the 3S dams could alter the flood-pulse hydrology driving the productivity of downstream ecosystems. Therefore, the main objective of this study was to quantify how hydropower development in the 3S would alter the hydrology of the Tonle Sap floodplain, the largest wetland in the Mekong and home to one of the most productive inland fisheries in the world. We coupled results from four numerical models representing the basin's surface hydrology, water resources development, and floodplain hydrodynamics. The scale of alterations caused by hydropower in the 3S was compared with the basin's definite future development scenario (DF) driven by the upper Mekong dam cascade. The DF or the 3S development scenarios could independently increase Tonle Sap's 30 day minimum water levels by 30 ± 5 cm and decrease annual water level fall rates by 0.30 ± 0.05 cm d-1. When analyzed together (DF + 3S), these scenarios are likely to eliminate all baseline conditions (1986–2000) of extreme low water levels, a particularly important component of Tonle Sap's environmental flows. Given the ongoing trends and large economic incentives in the hydropower business in the region, there is a high possibility that most of the 3S hydropower potential will actually be exploited and that dams would be built even in locations where there is a high risk of ecological disruptions. Hence, retrofitting current designs and operations to promote sustainable hydropower practices that optimize multiple river services – rather than just maximize hydropower generation – appear to be the most feasible alternative to mitigate hydropower-related disruptions in the Mekong.

Summary
Dams on Mekong tributaries as significant contributors of hydrological alterations to the Tonle Sap Floodplain in Cambodia

Excerpt
Adamson, P. T., Rutherfurd, I. D., Peel, M. C., and Conlan, I. A.: The hydrology of the Mekong River, in: The Mekong, available at: http://www.sciencedirect.com/science/article/B9FBM-4Y59TWF-M/2/29840b78b5de4ee935ae707cd803a3b4, Academic Press, San Diego, 53–76, 2009.; Agostinho, A. A., Bonecker, C. C., and Gomes, L. C.: Effects of water quantity on connectivity: the case of the upper Paraná River floodplain, Ecohydrol. Hydrobiol., 9, 99–113, 10.2478/v10104-009-0040-x, 2009.; Arias, M. E., Cochrane, T. A., Kummu, M., Killeen, T. J., Piman, T., and Caruso, B. S.: Quantifying changes in flooding and habitats in the Tonle Sap Lake (Cambodia) caused by water infrastructure development and climate change in the Mekong Basin, J. Environ. Manage., 112, 53–66, 2012.; Arias, M. E., Cochrane, T. A., Norton, D., Killeen, T. J., and Khon, P.: The flood pulse as the underlying driver of vegetation in the largest wetland and fishery of the Mekong Basin, Ambio, 42, 864–876, 10.1007/s13280-013-0424-4, 2013.; Arias, M. E., Cochrane, T. A., Kummu, M., Lauri, H., Koponen, J., Holtgrieve, G. W., and Piman, T.: Impacts of hydropower and climate change on drivers of ecological productivity of Southeast Asia's most important wetland, Ecol. Model., 272, 252–263, 2014.; Costa-Cabral, M. C., Richey, J. E., Goteti, G., Lettenmaier, D. P., Feldkötter, C., and Snidvongs, A.: Landscape structure and use, climate, and water movement in the Mekong River basin, Hydrol. Process., 22, 1731–1746, 2007.; Delgado, J. M., Merz, B., and Apel, H.: A climate-flood link for the lower Mekong River, Hydrol. Earth Syst. Sci., 16, 1533–1541, 10.5194/hess-16-1533-2012, 2012.; Dynesius, M. and Nilsson, C.: Fragmentation and flow regulation of river systems in the northern third of the world, Science, 266, 753–762, 10.1126/science.266.5186.753, 1994.; Kummu, M. and Sarkkula, J.: Impact of the Mekong River flow alteration on the Tonle Sap flood pulse, Ambio, 37, 185–192, 2008.; FitzHugh, T. W.: EFCAM: a method for assessing alteration of environmental flow components, River Res. Appl., 10.1002/rra.2681, in press, 2013.; Gao, Y., Vogel, R. M., Kroll, C. N., Poff, N. L., and Olden, J. D.: Development of representative indicators of hydrologic alteration, J. Hydrol., 374, 136–147, 10.1016/j.jhydrol.2009.06.009, 2009.; Grumbine, R. E. and Xu, J.: Mekong hydropower development, Science, 332, 178–179, 10.1126/science.1200990, 2011.; Grumbine, R. E., Dore, J., and Xu, J.: Mekong hydropower: drivers of change and governance challenges, Front. Ecol. Environ., 10, 91–98, 10.1890/110146, 2012.; ICEM: MRC Strategic Environmental Assessment of Hydropower on the Mekong mainstream, available at: http://icem.com.au/portfolio-items/mrc-sea-of-hydropower-on-the-mekong-mainstream-reports-series/ (last access: 12 February 2014), 2010.; Ishidaira, H., Ishikawa, Y., Funada, S., and Takeuchi, K.: Estimating the evolution of vegetation cover and its hydrological impact in the Mekong River basin in the 21st century, Hydrol. Process., 22, 1395–1405, 2008.; Johnston, R. and Kummu

 

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