中文摘要：

天然水体由于高坝泄水、气温骤升、光合作用过强等可能出现溶解气体（溶解氧和总溶解气体）过饱和,致使鱼类患气泡病甚至死亡。为探讨溶解气体过饱和水体的高效恢复技术,本文设计开展了不同曝气量、曝气深度、曝气孔径条件下的曝气试验,结果表明曝气对过饱和溶解氧释放的促进效果显著,在曝气量为3.0 m^3·h^-1情况下,释放系数为0.4844 min^-1,约为未曝气工况释放系数0.00016 min^-1的3000倍。过饱和溶解氧释放速率随曝气量的增加、曝气深度的降低、曝气孔径的减小而增加,并在此基础上建立了特定孔径下,过饱和溶解氧释放系数与曝气量和曝气深度的定量关系式。该研究为探讨利用曝气加快过饱和DO释放提供了科学依据,并为过饱和溶解气体影响的减缓措施研究提供了新思路。

英文摘要：

High dam spill, sudden warming and photosynthesis of nature water may result in supersaturation of water body with dissolved gases, such as dissolved oxygen and total dissolved gas, and this phenomenon might cause gas bubble disease and even mortality in fishes. To explore effective techniques for recovery of supersaturated water of this type, a series of aeration experiments were conducted in this work for the conditions of different aeration rates, water depths and aeration apertures. The results showed that aeration of water body can greatly accelerate the release of dissolved gas from supersaturated water body. When an aeration rate of 3.0 m^3h^-1 was used, the release coefficient was increased to 0.48 min^-1, or about 3000 times as large as that without aeration condition（0.00016 min^-1）. The release coefficient increased with the increasing aeration rate and decreased with the increasing aperture and water depth. A quantitative relationship of release coefficient versus water depth and aeration rate at given aeration apertures was developed. The present study lays a basis for further study and provides new ideas for design of practical measures.