风速对过饱和总溶解气体释放速率的影响

Impacts of wind speed on release rate of supersaturated total dissolved gas

通过不同风速下的过饱和总溶解气体（ TDG）室内释放试验,研究风速对过饱和TDG释放过程的影响,并根据已有释放模型对释放系数进行估算,建立了过饱和TDG释放系数与风速的定量关系式。结果表明在8.5～9.5益条件下,风速较小时,水体中过饱和TDG释放相当缓慢,随着风速的增大,过饱和TDG的释放速率显著增大；在无风工况下,TDG释放系数为0.00542 h-1；当风速为1.08～11.33 m/s时,TDG释放系数为0.00709～0.06668 h-1；相对释放系数为1～12.303,拟合的相对释放系数与风速的定量关系式计算偏差在-11.76%～10.21%之间。

A series of supersaturated total dissolved gas （ TDG） release tests, under different wind speeds, were carried out in laboratory and the impacts of wind speed on supersaturated TDG release process were studied. According to available release models, we estimated the release coefficients and derived a quantitative formula to describe the relationship between the release coefficient of supersaturated TDG and wind speed. Results showed that, under the condition that temperatures were among 8.5℃ and 9.5℃, the release rate was fairly slow for low wind speed, but the release rate of supersaturated TDG remarkably augmented as wind-speed increased. The release coefficient of TDG was 0.005 42 h-1 under windless condition, and others were between 0.007 09 h-1 and 0.066 68 h-1 with wind speeds ranging from 1.08 to 11.33 m/s. And, at the same time, the relative release coefficients were within the range of 1 to 12.303 in the experiment. Thereafter, a fitted quantitative formula between relative release coefficients and wind speeds was obtained, whose calculation deviation ranged from -11.76% to 10.21%.