Do Hydroelectric Dams Mitigate Global Warming? The Case of Brazil's CuruÁ-una Dam

摘要: Hydroelectric dams in tropical forest areas emit greenhouse gases, as illustrated by the Curua-Una Dam Amazonian portion of Brazil. Emissions include carbon dioxide from decay above-water portions trees that are left standing reservoir and methane soft vegetation decays under anaerobic conditions on bottom reservoir, especially macrophytes (water weeds) grows drawdown zone is flooded when water level rises. Some released surface through bubbling diffusion, but larger amounts passing turbines spillway. Methane concentration increases with depth, spillway draw sufficient depth to have substantial content. In 1990 (13 years after filling), emitted 3.6 times more gases than would been generating same amount electricity oil.