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Empirical model for estimating vertical concentration profiles of re-suspended, sediment-associated contaminants

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Zhu H W 1   Cheng P D 2   Li W 1   Chen J H 1   Pang Y 3   Wang D Z 4  
文摘 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 distributionwas 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 equationwas 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 itwas small, it might require dynamic micro-diffusion model.
来源 Acta Mechanica Sinica ,2017,33(5):846-854 【核心库】
DOI 10.1007/s10409-017-0650-2
关键词 Sediment resuspension ; Pollutants ; Concentration distribution ; Desorption ; Partition coefficient
地址

1. Shanghai Investigation, Design & Research Institute Co., Ltd, Shanghai, 200434  

2. Institute of Mechanics, Chinese Academy of Science, Chinese Academy of Science Key Laboratory for Mechanics in Fluid Solid Coupling System, Beijing, 100190  

3. Institute of Environmental Science and Engineering, Hohai University, Nanjing, 210098  

4. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai, 200072

语种 英文
文献类型 研究性论文
ISSN 0567-7718
学科 环境污染及其防治
基金 国家自然科学基金 ;  the National Key Research and Development Program ;  the NationalWater Pollution Control and Treatment Science and Technology Major Project
文献收藏号 CSCD:6094890

参考文献 共 28 共2页

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