Hanging silt curtains are commonly used in dredging projects as a pollution control measure to prevent the spread of suspended sediments and protect adjacent habitats.Based on the expansion project of the entrance channel in the Donglian operation area of Huizhou Port,a study was conducted to evaluate the layered pollution prevention effects of hanging silt curtains.Through on-site measurements of sediment concentration around the hanging silt curtains and sampling of suspended sediment,the temporal changes in the layered pollution prevention effects and the plane distribution of the overall pollution control effects were summarized.The research findings indicate that the pollution prevention effects of the upper and middle layers of the silt curtain are greater than 0,with the middle layer showing a significantly stronger effect than the upper layer,thus providing positive pollution control.In contrast,the pollution prevention effects of the bottom layer is less than 0,with increased concentrations of suspended sediment.During the operational period of the dredging vessel,as lateral sediment transport increases,the pollution prevention efficacy in the upper and middle layers reaches its peak,while the negative effects in the bottom layer also peak.At the same time,the pollution prevention effects show a significant positive correlation with flow velocity,and the influence of the silt curtain leads to noticeable differences in sediment grain size in the upstream and downstream lateral flow.Overall,the effectiveness of the hanging silt curtain is characterized by higher sediment concentrations on the protected side compared to the unprotected side,resulting in a net negative pollution prevention effect.From a holistic perspective,the net pollution prevention effect of the middle section of the curtain is less negative than that of the two sides.These results can provide reference for selecting pollution control measures and designing the parameter design and layout of hanging silt curtains.
waterway dredgingsuspended sediment measurementhanging silt curtainpollution control effectiveness
万方数据
维普
