环境工程学报2023，Vol.17Issue(12)：3897-3905,9.DOI:10.12030/j.cjee.202310120
环保绞吸船清淤作业过程对湖泊水环境的影响
Research on the impact of eco-friendly cutter suction dredger's sediment removal operation on lake water environment
摘要
Abstract
Effectively controlling and mitigating the impact of environmental dredging construction on surrounding water bodies is a key measure to reduce secondary pollution and enhance quality control of the project.This study focuses on the eco-friendly cutter suction dredger employed in the fourth phase of the environmental dredging project at Changdang Lake.Through on-site monitoring and simulation experiments,we investigated the spatiotemporal impact of the eco-friendly cutter suction dredger on the water quality of the surrounding water bodies during underwater operations.The results showed that the most significant impact of the dredger's operation on the surrounding water was on the concentration of total suspended solids(TSS),affecting an area of approximately 50 meters.By simulating the sediment settlement process after dredger construction,it was found that 4 hours after the disturbance ceased,the concentrations of total nitrogen(TN),total phosphorus(TP),and TSS in the overlying water decreased to 20％,7％,and 5％of their initial values,respectively.8 hours after the cessation of resuspension disturbance,the impact dredger construction on surrounding water was essentially eliminated.By comparing the pollutant content in columnar sediments before and after dredger operation,the removal rates of TN,TP,organic matter(OM),and cadmium(Cd)in the 0-20 cm surface sediment were 70％,73％,72％,and 85％,respectively.It is recommended that the diffusion distance limit of the dredger's construction should be adjusted based on actual working conditions.For shallow water lakes,special attention should be paid to the potential adverse effects of wind,waves,and dredger construction on sensitive water.关键词
环保清淤/绞吸船/清淤工艺/实施效果/监测评估Key words
environmental dredging/cutter suction dredger/dredging process/implementation effectiveness/monitoring and assessment分类
资源环境引用本文复制引用
李红静,陈海波,陆海明,梁庆华,孙宇,汪院生,谢得宝,张洪..环保绞吸船清淤作业过程对湖泊水环境的影响[J].环境工程学报,2023,17(12):3897-3905,9.基金项目
广西重点研发计划(AB22035075),江苏省水利科技项目(2021013) （AB22035075）
