水庫水體及底泥中的有機碳,經過水中微生物代謝分解,生成甲烷、二氧化碳與氧化亞氮等溫室氣體,通過擴散、氣泡等方式,經由水體界面排向大氣。本研究綜整文獻提出之水體溫室氣體排放監測方法,包括薄邊界層法(thin boundary layer)、浮箱法(non-steady state, non-through flow chamber),以及渦流相關法(eddy-covariance method)等 ,評估其原理、優缺點及於水庫水面上作業適用性,並進行上述方法的驗證作業;相關水庫水體溫室氣體量測結果,可供給國內水庫作為未來監測作業之參考。
Greenhouse gas (GHG), including methane, carbon dioxide and nitrous oxide, are released from the water body of reservoir when the organics in the sediment are decomposed by microorganisms. GHG emits through the air/water interface to the atmosphere with the mechanisms like diffusion and bubbling. This study summarizes the relevant literatures of reservoir G H G monitoring. The reported methods include thin boundary layer method, non-steady state/non-through flow chamber and eddy-covariance method. The principles, advantages, disadvantages, and applicability for reservoirs are discussed. A preliminary comparison was conducted. The related results can be the reference for the future monitoring on the reservoirs in Taiwan.