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Title:
Empirical model for estimating vertical concentration profiles of re-suspended, sediment-associated contaminants
Author: Zhu, H. W.; 程鹏达.; Li, W.; Chen, J. H.; Pang, Y.; Wang, D. Z.
Source: ACTA MECHANICA SINICA
Issued Date: 2017-10-01
Volume: 33, Issue:5, Pages:846-854
Abstract: Vertical distribution processes of sediment contaminants in water were studied by flume experiments. Experimental results show that settling velocity of sediment particles and turbulence characteristics are the major hydrodynamic factors impacting distribution of pollutants, especially near the bottom where particle diameter is similar in size to vortex structure. Sediment distribution was uniform along the distance, while contaminant distribution slightly lagged behind the sediment. The smaller the initial sediment concentration was, the more time it took to achieve a uniform concentration distribution for suspended sediment. A contaminants transportation equation was established depending on mass conservation equations. Two mathematical estimation models of pollutant distribution in the overlying water considering adsorption and desorption were devised based on vertical distribution of suspended sediment: equilibrium partition model and dynamic micro-diffusion model. The ratio of time scale between the sediment movement and sorption can be used as the index of the models. When this ratio was large, the equilibrium assumption was reasonable, but when it was small, it might require dynamic micro-diffusion model.
Keyword: Sediment resuspension ; Pollutants ; Concentration distribution ; Desorption ; Partition coefficient
Language: 英语
Indexed Type: SCI ; EI ; CSCD
Corresponding Author: Cheng, PD (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China.
Correspondent Email: pdcheng@imech.ac.cn
DOI: 10.1007/s10409-017-0650-2
Related URLs: 查看原文
DOC Type: Article
WOS Subject: Engineering, Mechanical ; Mechanics
WOS Subject Extended: Engineering ; Mechanics
WOS Keyword Plus: WATER INTERFACE ; TRANSPORT ; RELEASE ; PHOSPHORUS ; MECHANISMS
WOS ID: WOS:000411700100002
ISSN: 0567-7718
Funder: National Natural Science Foundation of China(11502138) ; National Key Research and Development Program(2016YFC0401500) ; National Water Pollution Control and Treatment Science and Technology Major Project(2012ZX07506-002b)
Department: LMFS水环境流体力学(LEM)
Classification: 二类
Ranking: 1
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/70067
Appears in Collections:流固耦合系统力学重点实验室(2012-)_期刊论文

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Recommended Citation:
Zhu, H. W.,程鹏达.,Li, W.,et al. Empirical model for estimating vertical concentration profiles of re-suspended, sediment-associated contaminants[J]. ACTA MECHANICA SINICA,2017-10-01,33(5):846-854.
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