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Heavy metal enrichment in the riparian sediments and soils of the Three Gorges Reservoir, China
Tang Qiang1,2; Bao Yuhai1; He Xiubin1; Wen Anbang1
Corresponding AuthorHe Xiubin
meetingInternational Symposium on Sediment Dynamics: From the Summit to the Sea
Conference DateDEC 11-14, 2014
Conference PlaceNew Orleans
Publication PlaceWALLINGFORD
Contribution Rank1
Funding OrganizationInternational Commission on Continental Erosion (ICCE) of IAHS
AbstractThe Three Gorges Reservoir encompasses a riparian zone with a vertical height of 30 m and a total area of 349 km(2) that has been subjected to alternate inundation and exposure due to regular impoundment. Sedimentation on the riparian landforms constitutes an important pathway for riverine contaminant redistribution. In an attempt to understand heavy metal enrichment since water inundation, riparian sediments and soils were sampled along five transects in a typical riparian zone composed of cultivated bench terraces in the middle reaches. Heavy metals (Cr, Ni, Cu, Zn, As, Cd and Pb) were determined to characterize the lateral distribution and vertical transfer ratio. The results indicated that all heavy metals were enriched to varying extents both in the riparian sediments and soils, compared with regional background contents in soils and the reference levels in sediments. However, heavy metal levels in the riparian sediments were generally higher than those in the riparian soils, while those in the upper riparian soils (0-5 cm) were overall slightly higher than those in the lower riparian soils (5-10 cm). There was a decreasing trend of heavy metal contents with increasing elevation. The elevated levels of heavy metals in the riparian sediments may be attributed to sediment yields from upstream anthropogenic sources, especially during major rainstorms in the wet season when large loads of contaminated sediment may be produced from diffuse source areas. Heavy metals can also be adsorbed to pure sediment in the course of mobilization or after deposition. Considering that the riparian soils are local weathering products without mobilization, the enrichment of heavy metals may principally be ascribed to chemical adsorption from dissolved fractions or vertical transfer from overlaid sediments. Heavy metal enrichment may further be affected by the specific type of hydrologic regime such that relatively long flooding duration caused by water impoundment and natural floods was responsible for the relatively higher levels of heavy metals in the lower portions of the riparian zone.
Keywordsedimentation heavy metal diffuse contaminants riparian zone Three Gorges Reservoir
Subject Area自然地理学 ; 水土保持学
Indexed ByEI ; CPCI
WOS IDWOS:000357222000032
EI Accession NumberAccession number:20154301445875
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type会议论文
Corresponding AuthorTang Qiang
Affiliation1.Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China;
2.State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Tang Qiang,Bao Yuhai,He Xiubin,et al. Heavy metal enrichment in the riparian sediments and soils of the Three Gorges Reservoir, China[C]. WALLINGFORD:INT ASSOC HYDROLOGICAL SCIENCES,2014:244-250.
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