南水北调中线干渠藻-泥淤积问题及应对策略研究OA
Study on algae-mud siltation and its countermeasures in the main canal of the middle route of the South-to-North Water Diversion Project
藻-泥颗粒悬浮物及其输移和沉降过程是影响南水北调中线工程水质安全的主要因素之一.本研究通过2021-2024年间四次南水北调中线全线淤积特征调查和一次特征点采样分析,系统阐述了中线干渠淤积分布特征、悬浮颗粒物特征及其动态变化对淤积过程的影响,评估了藻泥淤积对水质的潜在风险并提出了防控策略.结果表明:(1)干渠淤积量从南到北呈递增趋势,常年发生淤积点位53处,其中7处为高风险点(淤积量均>200 m3),退水闸区域淤积风险最高,李阳河退水闸前淤积量最高达3789.8 m3;(2)干渠沿线淤积量与悬浮颗粒物浓度、密度和藻类密度的动态变化具有显著的正相关关系;(3)淤积过程会导致藻源性有机质释放,以李阳河淤积区为例估算出藻-泥悬浮物淤积将会使局部水体DOM提升0.22～0.54 mg/L;(4)通过生态补水与退水区水动力协同调控,可实现高效、低成本的淤积防控,有效缓解闸下游及末端淤积风险.研究结果对保障南水北调中线干渠水质安全具有重要意义.
Algal-Mud Particulate Suspended Matter and Its Transport and Sedimentation Processes:Implications for Water Quality Safety in the Middle Route of the South-to-North Water Diversion Project Algal-mud particulate sus-pended matter and its transport and sedimentation processes are among the key factors affecting the water quality safety of the Middle Route of the South-to-North Water Diversion Project(MR-SNWDP).Based on four comprehen-sive surveys on the sedimentation characteristics of the entire MR-SNWDP main canal conducted from 2021 to 2024 and one characteristic point sampling analysis,this study systematically elaborates on the distribution characteristics of sedimentation in the main canal,the properties of suspended particulates,and the influence of their dynamic changes on the sedimentation process.Additionally,it assesses the potential risks of algal-mud sedimentation to water quality and proposes corresponding prevention and control strategies.The results indicate the following:(1)The sedimentation volume in the main canal shows an increasing trend from south to north.There are 53 locations with perennial sedimentation,among which 7 are high-risk points(with sedimentation volume>200 cubic meters(m³)at each point).The sluice gate areas have the highest sedimentation risk,and the sedimentation volume in front of the Liyang River Sluice Gate reaches a maximum of 3,789.8 m3.(2)There is a significant positive correlation between the sedimentation volume along the main canal and the dynamic changes in suspended particulate concentra-tion,density,and algal density.(3)The sedimentation process induces the release of algal-derived organic matter.Taking the Liyang River sedimentation area as an example,it is estimated that the sedimentation of algal-mud sus-pended matter will increase the dissolved organic matter(DOM)concentration in local water bodies by 0.22-0.54 mg/L.(4)Through the synergistic regulation of ecological water replenishment and hydrodynamics in sluice gate areas,efficient and low-cost sedimentation prevention and control can be achieved,which effectively alleviates the sedimentation risk in the downstream areas of sluices and the terminal section of the canal.The results of this study hold significant importance for ensuring the water quality safety of the MR-SNWDP main canal.
刘奕;赵伦;刘洋洋;贾兵营;陈立斌;张洪刚
长江大学资源与环境学院,武汉 430100||中国科学院生态环境研究中心,北京 100085中国南水北调集团中线有限公司,北京 100083中国南水北调集团中线有限公司,北京 100083中国南水北调集团中线有限公司,北京 100083长江大学资源与环境学院,武汉 430100中国科学院生态环境研究中心,北京 100085
资源环境
南水北调中线干渠淤积退水闸悬浮颗粒物藻类
the main canal of the Middle Route of the South-to-North Water Diversion Projectsiltationsluice gatesuspended particulate matteralgae
《中国水利水电科学研究院学报（中英文）》 2026 (5)
670-680,11
国家重点研发计划项目(2021YFC3200904)
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