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Methane release below a tropical hydroelectric dam
Author(s) -
Kemenes Alexandre,
Forsberg Bruce Rider,
Melack John Michael
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl029479
Subject(s) - hydroelectricity , methane , environmental science , hydrology (agriculture) , methane emissions , floodplain , downstream (manufacturing) , amazon rainforest , discharge , outflow , drainage basin , geology , oceanography , geography , ecology , geotechnical engineering , biology , operations management , cartography , economics
Tropical reservoirs upstream from hydroelectric dams are known to release significant amounts of methane to the atmosphere. Here we demonstrate that methane emissions downstream from hydroelectric dams can also be large. Emissions of CH 4 downstream of Balbina reservoir in the central Amazon basin (Brazil) were calculated from regular measurements of degassing in the outflow of the turbines and downstream diffusive losses. Annual emissions from the reservoir surface and downstream from the dam were 34 and 39 Gg C, respectively. The downstream emission alone represented the equivalent of 3% of all methane released from central Amazon floodplain.