中文摘要：

高坝泄水常为高含沙水流,对含沙水体过饱和总溶解气体（TDG）释放规律的研究具有重要的理论和现实意义。为探讨泥沙含量以及紊动强度等特性对过饱和TDG释放过程的影响,设计了静置水柱、搅拌诱发紊动以及明渠水流3种实验条件,通过对不同含沙量工况下过饱和TDG释放过程的观测研究,分别计算各工况下的释放系数。结果表明,泥沙含量和紊动强度均对过饱和TDG的释放起着促进作用,而且随着含沙量和紊动强度的增大,释放系数逐渐增大。本研究对于过饱和TDG数值模拟研究中释放系数的取值具有指导意义,同时也可为过饱和TDG影响的减缓措施研究提供基础数据和参考依据。

英文摘要：

During its transportation over long distances, supersaturated Total Dissolved Gas （TDG） may lead to gas bubble disease or even heightened fish mortality. Because the sediment concentration is always high in spill flow in China, studying the releasing law of supersaturated TDG in sandy water is of great theoretical and practical value. In the experiment described in this paper, we designed three kinds of experimental conditions, including a static water column, stir-induced turbulent water and an open channel flow. For each experimental condition, the TDG release processes were monitored both in fresh water and sandy water. The dissipation coefficients were calculated and com- pared under different sedimentation levels. The results indicate that both sediment and turbulence intensity can in- crease the release speed of TDG. The higher the sediment concentration level and turbulence intensity are, the greater the dissipation coefficients are. This study can provide important guidance for determining dissipation coefficients in a TDG simulation model, and can serve as a reference in exploring mitigation measures of supersaturated TDG.