Zhao D.,Changjiang River Scientific Research Institute |
Zhao D.,Hubei Key Laboratory of Water Resources and Eco Environment Science HB WREES |
Cheng X.,Changjiang River Scientific Research Institute |
Cheng X.,Hubei Key Laboratory of Water Resources and Eco Environment Science HB WREES |
And 6 more authors.
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2014
Spatial-temporal variation of methane source and sink from hydroelectric reservoir is an important factor in evaluation of the clean energy credentials of hydropower and the effects of hydropower project construction on ecosystem carbon cycle over the basin. In this study, we selected the Shuibuya reservoir as a representative over the Qingjiang river basin for measurement of methane diffuse fluxes at the air-water interface in the period from Sep. 2010 to Nov. 2012, using a combination method of floating box and portable trace gas. Data analysis indicates that mean methane flux was 0.684±0.763 mg/(m2·d), with a peak of 2.152±1.171 mg/(m2·d) in Sep. 2010 and a minimum of 0.114±0.087 mg/(m2·d) in Mar. 2011. Among all the spatial locations sampled, higher emission levels of 0.902±0.702 and 0.845±0.703 mg/(m2·d) were measured at the far upstream from the dam and the outlets of tributaries respectively, and lover level of 0.419±0.379 mg/(m2·d) behind the dam. The fluxes over the reservoir is positively related with dissolved oxygen, chlorophyll, water temperature, and conductivity from surface water-body, but negatively related with pH value and total carbon in the surface layer of impoundment. Source