中文摘要：

挖泥船疏浚施工引起的悬浮物扩散对海域环境具有危害性.对绞吸式挖泥船疏浚作业、耙吸式挖泥船疏浚和溢流引起的悬浮物扩散以及潮流流向、流速开展现场观测.结果表明,因疏浚对底泥的扰动作用,底部悬浮物浓度相对较大,表层悬浮物浓度相对较小.在对流和扩散作用下,形成以疏浚船为中心不断向外扩散的浑浊水体.溢流发生造成挖泥船附近水域悬浮物浓度增加,表层悬浮物浓度增幅较大.

英文摘要：

There is increasing awareness of environmental impact of suspended solids diffusion induced by dredging. The field observation was carried out to investigate turbidity plume during dredging operation of cut- ter suction dredgers and drag-suction dredgers and after drag-suction dredger spilling. The tidal current veloci- ty and direction were measured. The results showed that the concentration of suspended solids near bottom was greater than those on the water surface, because of bottom mud disturbance by dredgers. The turbidity plume centerer spread to surrounding water under convection and diffusion action. The concentration of suspended solids near the dredger increased after drag-suction dredger spilling, especially the concentration near water surface.