中文摘要：

大坝泄水对环境的不利影响之一是会产生总溶解气体（TDG）过饱和现象,导致鱼类患气泡病甚至死亡。在理论分析的基础上,建立了基于面流消能的TDG过饱和浓度预测公式。该预测公式采用平均静水压强作为自变量进行TDG饱和度计算,避免了以往采用很难精确定量的动水压强进行TDG预测而带来的不便。通过对大渡河上龚嘴水电站泄洪期间TDG过饱和气体的原型观测,对公式参数进行了率定。所建立的公式可用于面流消能时坝下TDG过饱和度的预测。

英文摘要：

The supersaturation of total dissolved gas（TDG） downstream of dams,is one of the possible negative effects of hydropower stations on environment,which can lead to gas bubble disease or even death of fish.Based on the conceptual summarization of the TDG production process,the TDG prediction model for dam projects,in which the surface flow energy dissipation is adopted,is developed in this paper.The prediction model takes the average hydro-pressure as the main dependent variable.The model is more practical and easy to use because of avoiding using the dynamic pressure as the dependent variable,which is difficult to quantify.The model is calibrated by field data and employed in the TDG prediction of Gongzui Hydropower Project to be built on the Dadu River.