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Hydropower dam energy without sacrificing Mekong food supply: New research offers solution

Date:
December 7, 2017
Source:
Arizona State University
Summary:
Nearly 100 hydropower dams are planned for construction along tributaries off the Mekong River's 2,700-mile stretch. In a new article, researchers present a mathematical formula to balance power generation needs with the needs of fisheries downstream.
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The Mekong River is an economic engine for fishermen and a food source for millions of people worldwide. Nearly 100 hydropower dams are planned for construction along tributaries off the river's 2,700-mile stretch, which flows through Burma, China, Vietnam, Laos, Thailand and Cambodia.

But while the dams are expected to provide clean energy to the region, if not managed properly, they also have the potential to offset natural river patterns, which would damage food production, supply and business.

Arizona State University professor John Sabo and collaborators have proposed a solution in the Dec. 8 issue of Science magazine that allows dam operators to generate power in ways that also protect -- and possibly improve -- food supplies and businesses throughout the Mekong river basin.

"We have figured out the relationship between river flows and fish catch, and we have developed an algorithm for dam operators to use that will increase fish harvests and still generate power," Sabo said. "Dams are going to be built no matter how much fuss we make; our research shows how we can be more strategic about the buildout and operations of these dams in the Mekong."

The proposed solution, the first of its kind for this problem, can be applied to other large river systems around the world facing similar tradeoffs.

The Mekong river floods annually, and it is known that those floods are important for fisheries, Sabo said. New in this research is the recognition that seasonal droughts are equally important. Long droughts combined with short floods may create the ideal conditions for terrestrial nutrients to be entrained into the freshwater system.

With that in mind, the algorithm presented by Sabo et al. in Science recommends long low-flow periods punctuated by pulses of flooding, which will allow dam operators to co-manage their power generation priorities, while protecting livelihoods for fisheries downstream.

Sabo worked with other ASU researchers on the project, as well as researchers from the University of Washington, University of Maryland, Conservation International, the University of South Florida, the Mekong River Commission and Aalto University.

"We have taken this conversation around fisheries and dams in the Mekong from a yes-or-no conversation, from a good idea-bad idea conversation, and we have come up with an alternative, a mathematical formula that has the possibility to achieve dam operator goals and protect fisheries," said Gordon Holtgrieve, an assistant professor at the University of Washington.

With recent funding from the National Science Foundation, Sabo, Holtgrieve and a team of researchers will expand the project to better understand how dam operators can balance power generation needs with other factors, including rice production, food nutritional quality and ecological goals.


Story Source:

Materials provided by Arizona State University. Note: Content may be edited for style and length.


Journal Reference:

  1. J. L. Sabo, A. Ruhi, G. W. Holtgrieve, V. Elliott, M. E. Arias, Peng Bun Ngor, T. A. Räsänen, So Nam. Designing river flows to improve food security futures in the Lower Mekong Basin. Science, 2017; 358 (6368): eaao1053 DOI: 10.1126/science.aao1053

Cite This Page:

Arizona State University. "Hydropower dam energy without sacrificing Mekong food supply: New research offers solution." ScienceDaily. ScienceDaily, 7 December 2017. <www.sciencedaily.com/releases/2017/12/171207141709.htm>.
Arizona State University. (2017, December 7). Hydropower dam energy without sacrificing Mekong food supply: New research offers solution. ScienceDaily. Retrieved March 18, 2024 from www.sciencedaily.com/releases/2017/12/171207141709.htm
Arizona State University. "Hydropower dam energy without sacrificing Mekong food supply: New research offers solution." ScienceDaily. www.sciencedaily.com/releases/2017/12/171207141709.htm (accessed March 18, 2024).

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