刘建卫

个人信息Personal Information

副教授

博士生导师

硕士生导师

性别:男

毕业院校:大连理工大学

学位:博士

所在单位:水利工程系

学科:水文学及水资源

联系方式:jwliu@dlut.edu.cn 0411-84706553

电子邮箱:jwliu@dlut.edu.cn

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Metal distribution in sediments of a drinking water reservoir: influence of reservoir morphometry and hydrodynamics

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论文类型:期刊论文

发表时间:2019-02-06

发表刊物:Environmental science and pollution research international

收录刊物:PubMed、Scopus

ISSN号:1614-7499

关键字:Chemical speciation,Diffusive flux,Metals,Mn accumulation,Reservoir morphometry,Turbidity current

摘要:Metal(loid)s in the reservoir sediment tend to be released into the water column when encountering disturbances and thus pose threats to the aquatic system. In this study, sediment and pore water samples collected from eight cross sections in the Biliu River Reservoir (Dalian, China) were analyzed to determine the spatial distributions of six metal(loid)s and their associations with reservoir morphometry and hydrodynamics. The results show that total metal concentrations of the sediments are higher at the sites with greater water depths and are influenced by the reservoir morphometry. Mn is of great concern with respect to its increasing total concentration from the upstream sites to the dam sites. According to the improved BCR sequential extraction procedure, the acid-soluble fraction of Mn increases along the thalweg to the dam, implying the soluble Mn2+ in the upstream hypolimnion, and sediment is possible to be transported longitudinally by water currents. For Fe, Mn, Pb, Cu, and Zn, the reducible fraction accounts for more than 15% of the total metal concentration, which suggests that Fe-Mn (hydr)oxides could be important in scavenging these metals. High Mn concentrations in pore waters close to the dam, with an average value of more than 40 mg/L, give rise to significant Mn diffusive flux up to 296.1 mg/m2/day.