Methane Buildup In Rwandan Lake Makes It A Potential Time Bomb

by Tanya Thomas on  November 21, 2009 at 8:23 AM Environmental Health   - G J E 4
 Methane Buildup In Rwandan Lake Makes It A Potential Time Bomb
Lake Kivu, freshwater lake system bordering Rwanda and the Republic of Congo, may soon have dire consequences for those living along its banks. Scientists have expressed their fears that the lake runs the risk of turning into a freshwater time bomb because of a dangerous level of carbon dioxide and methane gas.

In a region prone to volcanic and seismic activity, the fragility of Lake Kivu is a serious matter.

Compounding the precarious situation is the presence of approximately 2 million people, many of them refugees, living along the north end of the lake.

An international group of researchers will meet January 13-15 at a conference in Gisenyi, Rwanda, to grapple with the problem of Lake Kivu.

"Most scientists are fairly in agreement that the lake is pretty stable; it's not as if it's going to come bursting out tomorrow," said Anthony Vodacek, conference organizer and associate professor at RIT's Chester F. Carlson Center for Imaging Science.

"But in such a tectonically and volcanically active area, you can't tell what's going to happen," he added.

One of the problems with Lake Kivu is that the 1,600-foot deep lake never breathes.

The tropical climate helps stagnate the layers of the lake, which never mix or turn over. In contrast, fluctuating temperatures in colder climates help circulate lake water and prevent gas build up.

Lake Kivu is different from both temperate and other tropical lakes because warm saline springs, arising from ground water percolating through the hot fractured lava and ash, further stabilize the lake.

A number of catalysts could destabilize the gas resting at the bottom of Lake Kivu.

It could be an earthquake, a volcanic explosion, a landslide or even the methane mining that has recently united Rwandan and Congolese interests.

Vodacek likens the contained pressure in the lake to a bottle of carbonated soda or champagne.

"In the lake, you have the carbon dioxide on the bottom and 300 meters of water on top of that, which is the cap," he said. "That's the pressure that holds it. The gas is dissolved in water," he added.

When the cap is removed, bubbles form and rise to the surface. More bubbles form and create a column that drags the water and the gas up to the surface in a chain reaction.

Through his own research, Vodacek plans to simulate the circulation of Lake Kivu.

Modeling the circulation patterns above the layers of carbon dioxide and methane will help determine the energy required to disrupt the gas and cause Lake Kivu to explode.

Source: ANI

Post your Comments

Comments should be on the topic and should not be abusive. The editorial team reserves the right to review and moderate the comments posted on the site.
User Avatar
* Your comment can be maximum of 2500 characters
Notify me when reply is posted I agree to the terms and conditions

You May Also Like

View All