关键词: 气泡帘, 悬浮物扩散, 环保疏浚, 耙吸挖泥船

Abstract: The construction of trailing suction hopper dredger will lead to the spread of suspended solids and affect the water quality of the nearby waters. More and more suction dredger operations are required for environmentally friendly construction, and the bubble rises to form a bubble curtain to prevent the diffusion of suspended mattress can have a good effect. In this paper, the formation process of bubble curtain and the mechanism of anti-suspension diffusion under the action of ocean current are studied by CFD simulation. The results show that the formation process of bubble curtain is affected by the diameter of the bubble, the aeration velocity and the velocity of current. Increasing the aeration and selecting the appropriate diameter of the bubble can enhance the ability of the bubble curtain in preventing the diffusion of pollutants, while the excessive current velocity will lead to the failure of bubble curtain; for a given operating condition, there is a critical barrier particle size for the dredged suspension. The research results can provide a theoretical basis for the reasonable determination of the structural parameters and operating parameters of the bubble curtain.

Key words: bubble curtain, suspended solids dispersion, environment protection dredging, trailing suction hopper dredger