|Water Science and Engineering 2014, 7(3) 344-350 DOI: doi:10.3882/j.issn.1674-2370.2014.03.009 ISSN: 1674-2370 CN: 32-1785/TV|
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Relative roles of resuspended particles and pore water in release of contaminants from sediment
Hong-Wei ZHU1, 2, Peng-da CHENG3, Dao-Zeng WANG1, 2
1. Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, P. R. China
Sediment layers containing contaminants play a significant role in environmental hydrodynamics. Experiments were conducted in order to characterize the relative roles of resuspended particles and pore water under different flow and sediment conditions. A conservative tracer (NaCl) and a reactive tracer (phosphate) were used as contaminants in the bottom sediment in a laboratory flume. The mixing between the overlying water and pore water occurred over a short time while the desorption of contaminants from fine-grained resuspended particles lasted a relatively long time. The effects of resuspended particles and pore water on the variations of release flux and concentration of contaminants in water with time under different hydrodynamic conditions were quantified. The results show that pore water dominated the initial release flux, which could be several orders of magnitude greater than the flux due to molecular diffusion. Flux contribution of desorption from sediment particles in the latter release could be equal to what was seen from pore water in the initial stage.
|Keywords： sediment resuspension resuspension particle pore water release of contaminant release flux|
|Received 2013-02-27 Revised 2013-06-06 Online: 2014-07-25|
This work was supported by the National Natural Science Foundation of China (Grants No. 10972134 and 11032007).
|Corresponding Authors: Dao-zeng WANG|
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