中文摘要：

随着大量高坝的建成运行,泄水引起下游水体中总溶解气体（Total dissolved gas,TDG）过饱和可能致使鱼类患气泡病甚至死亡.考虑到TDG过饱和的泄洪水流在下游河道的输移过程中常伴随河滩地植被被淹没现象.为探讨过饱和TDG的快速释放的恢复技术,以立柱为阻水介质模拟滩地植被,设计开展了不同排列型式、不同疏密程度、不同介质表面粗糙程度条件下的阻水介质作用下过饱和TDG释放过程研究实验,结果表明阻水介质的存在对加速过饱和TDG的释放速度效果显著,过饱和TDG释放速率随阻水介质排列密度的增加、介质表面粗糙程度的增加、介质外观不规则程度的增加而增加.该研究为探讨利用阻水介质加快过饱和TDG释放提供了科学依据,并为减缓TDG过饱和不利影响的措施研究提供新思路和参考.

英文摘要：

High dam spilling raises the supersaturated total dissolved gas level in the stilling basin. The phenomenon might cause gas bubble disease,even mortality in fishes. Accompanied with the high dam spilling,the water level of the river downstream of the dam rises and the vegetation in floodplain is submerged or partly submerged. To explore the effective techniques for the recovery of dissolved gas supersaturated water,a series of dissipation experiments were conducted with different vegetation density,arrangement,surface roughness and appearance sharp,using columns of different materials as water blocking mediums. The results showed that the existence of columns in water could accelerate greatly the release process of supersaturated total dissolved gas. The dissipation coefficient increased with the vegetation density,surface roughness and sharpness of columns. The research provides scientific basis of the exploration,accelerating the dissipation of supersaturated total dissolved gas,and provides new ideas and reference for the research of the mitigation measures to the problem.