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Monday, June 09, 2014

Dams have a role in Global Warming  

"Termed as icons of development, large and medium dams do play a role in global warming! Yes, a new study has revealed how the reservoirs behind the dams cause surges of greenhouse gases as the water levels go up and down. In a study of the water column at such a reservoir, marine scientists found an astonishing 20-fold increase in methane emissions as water levels were drawn down. Bubbles coming out of the mud and sediment at the bottom were chock full of this potent greenhouse gases."


HNF Bureau


As per a report published in Environment News Network (ENN) portal, dams worldwide play a role in global warming even though, while talking about global warming, most of the time we think about fossil fuel vehicles, factories, power plants and landfills whereas role of lakes, reservoirs, and streams often go unnoticed when calculating carbon emissions.

The truth is that there is a lot biological activity going on behind the dam. This is where the natural flow of sediment and living things stop and therefore accumulate. Through the decomposition of such creatures and organic material comes methane gas that builds up in the lake bed’, says the report that takes clues from the recent study at Lacamas Lake in Clark County, Washington.


Conducted by Washington State University researchers Bridget Deemer and Maria Glavin, the research has challenged the notion that lakes and reservoirs acted as carbon sinks, where carbon dioxide is absorbed from the atmosphere. They rather concluded that their carbon storage abilities could be less than one fourth what was estimated, when accounting for the drawdown of water in reservoirs.

‘As levels of water go down, the lake bed heats up because more sunlight is hitting it. The rising temperatures cause the methane to bubble up and out into the atmosphere. This is particularly true in summer because low oxygen conditions at the depth of the reservoir create an ideal condition for microbial activity that creates the methane’, says the research.

‘This research could lead to new methods of managing reservoirs by timing the water draw downs to avoid the summer months. We have the ability to manage the timing, magnitude and speed of reservoir draw downs, which all could play a role in how much methane gets released to the atmosphere", says the ENN report quoting the student's advisor and assistant professor of Earth and Environmental Sciences John Harrison.

The research continues to find out the optimal way to drawdown water from a reservoir, the optimal time for dam removal, and whether or not the placing of certain plants and soils might help.

‘In the United States, reservoirs behind dams take up a tiny fraction of overall land surface. However, due to their increased biological activity, they have an outsized effect on methane emissions. Across the country there are about 80,000 dams’, says the report.


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