IMECH-IR  > 流固耦合系统力学重点实验室
Transport mechanisms of contaminants released from fine sediment in rivers
Cheng PD(程鹏达); Zhu HW; Zhong BC; Wang DZ; Wang, DZ (reprint author), Shanghai Univ, Shanghai Inst Appl Math & Mech, Shanghai 200072, Peoples R China.
Source PublicationACTA MECHANICA SINICA
2015-12
Volume31Issue:6Pages:791-798
ISSN0567-7718
AbstractContaminants released from sediment into rivers are one of the main problems to study in environmental hydrodynamics. For contaminants released into the overlying water under different hydrodynamic conditions, the mechanical mechanisms involved can be roughly divided into convective diffusion, molecular diffusion, and adsorption/desorption. Because of the obvious environmental influence of fine sediment ( 0.06 mm), non-cohesive fine sediment, and cohesive fine sediment are researched in this paper, and phosphorus is chosen for a typical adsorption of a contaminant. Through theoretical analysis of the contaminant release process, according to different hydraulic conditions, the contaminant release coupling mathematical model can be established by the N-S equation, the Darcy equation, the solute transport equation, and the adsorption/desorption equation. Then, the experiments are completed in an open water flume. The simulation results and experimental results show that convective diffusion dominates the contaminant release both in non-cohesive and cohesive fine sediment after their suspension, and that they contribute more than 90 % of the total release. Molecular diffusion and desorption have more of a contribution for contaminant release from unsuspended sediment. In unsuspension sediment, convective diffusion is about 10-50 times larger than molecular diffusion during the initial stages under high velocity; it is close to molecular diffusion in the later stages. Convective diffusion is about 6 times larger than molecular diffusion during the initial stages under low velocity, it is about a quarter of molecular diffusion in later stages, and has a similar level with desorption/adsorption. In unsuspended sediment, a seepage boundary layer exists below the water-sediment interface, and various release mechanisms in that layer mostly dominate the contaminant release process. In non-cohesive fine sediment, the depth of that layer increases linearly with shear stress. In cohesive fine sediment, the range seepage boundary is different from that in non-cohesive sediment, and that phenomenon is more obvious under a lower shear stress.
KeywordCohesive Diffusion Seepage Boundary Layer Adsorption/desorption Coupling
DOI10.1007/s10409-015-0520-8
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000367452900002
WOS KeywordMACRO-TIDAL ESTUARY ; WATER INTERFACE ; MASS-TRANSFER ; SUSPENSIONS ; TURBULENCE ; DYNAMICS ; UK
WOS Research AreaEngineering ; Mechanics
WOS SubjectEngineering, Mechanical ; Mechanics
Funding OrganizationThis work was supported by the National Key Program of the National Natural Science Foundation of China (Grant 11032007)
Classification二类
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Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/58653
Collection流固耦合系统力学重点实验室
Corresponding AuthorWang, DZ (reprint author), Shanghai Univ, Shanghai Inst Appl Math & Mech, Shanghai 200072, Peoples R China.
Recommended Citation
GB/T 7714
Cheng PD,Zhu HW,Zhong BC,et al. Transport mechanisms of contaminants released from fine sediment in rivers[J]. ACTA MECHANICA SINICA,2015,31(6):791-798.
APA 程鹏达,Zhu HW,Zhong BC,Wang DZ,&Wang, DZ .(2015).Transport mechanisms of contaminants released from fine sediment in rivers.ACTA MECHANICA SINICA,31(6),791-798.
MLA 程鹏达,et al."Transport mechanisms of contaminants released from fine sediment in rivers".ACTA MECHANICA SINICA 31.6(2015):791-798.
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