| For a long time,the removal of sediment has been an important part of urban river regulation.However,there is currently a lack of systematic research,which is on the sediment production,composition,release of pollutants in the river,and the removal process finally.Especially,there is a lack of quantitative research on the impact to the water quality from the river sediment.Starting with the source of sediment in urban river in Hangzhou City,the paper analyses the various channels produced of river sediment.The sediment of Hangzhou River mainly comes from sewage drained into the river,water distribution,initial rainwater,natural settlement and soil erosion.The sediment monitoring and sampling in Hangzhou show that the accumulation of sediment is mainly concentrated in the eastern of Canal.The stratified characteristics of the sediment are obvious,and the contaminants of the sediment in the upper layer is higher than that in the lower layer.According to the experiments,the release of pollutants of the sediment has a significant positive correlation at different temperatures and velocities,and the release concentration of the upper layer pollutants is higher than the lower layer obviously.The water quality has a dynamic equilibrium relationship with the release of pollutants at a constant flow rate.The pollution of river sediment is very serious.According to the characteristics of the river sediment,the proper dredge method should be adopted,which can improve the efficiency,effectiveness and cost-effectiveness effectively.On the other hand,several aspects of dredge method in Hangzhou city are analyzed such as environment,equipment,processes,standards,costs,and water quality impacts.Through comparison and research,one integrated process of river dredging is put forward,which contains multiple segment in one such as suction,delivery,solidification,resource utilization,etc.The integrated and environmental process of urban river dredging is the development direction of dredging. |
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