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Hydrodynamic effects on contaminants release due to rususpension and diffusion from sediments

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Abstract

Hydrodynamic effects play a very important role in the contaminants release from sediments. Experiments were performed to study contaminants releasing characteristics due to resuspension. The time-dependent variation of COD concentration and relative roles under static and dynamic state of the overlying water were analyzed. Experimental results showed that COD concentration in the water column got a striking increment on the dynamic conditions, mainly by reducing the thickness of concentration boundary layer near sediment-water interface and destructing the surface structure of sediment. Hydrodynamics increased contaminants release rates and flux in unit time. Before reaching an equilibrium stage, the dynamic release caused by the resuspension was more effective than static one due to molecular diffusion. The release rate of COD increased with flow velocity and decreased with water depth. But at a shallow water depth, wave effects would dominate the causing resuspension, resulting in contaminants release in large quantity. The intensity of pollutant release increased with time in a rather circuitous process. The diffusion of pollutant from internal sediment to the sediment-water interface would maintain the endogenous release effects.

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Authors and Affiliations

  1. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai, 200072, China

    Hong-wei Zhu  (朱红伟)

  2. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering and School of Mechatronical Engineering and Automation, Shanghai University, Shanghai, 200072, China

    Peng-da Cheng  (程鹏达)

  3. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai, 200072, China

    Bao-chang Zhong  (钟宝昌) & Dao-zeng Wang  (王道增)

Authors
  1. Hong-wei Zhu  (朱红伟)
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  2. Peng-da Cheng  (程鹏达)
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  3. Bao-chang Zhong  (钟宝昌)
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  4. Dao-zeng Wang  (王道增)
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Corresponding author

Correspondence to Dao-zeng Wang  (王道增).

Additional information

Project supported by the National Natural Science Foundation of China (Grant No. 10972134), the National Key Program of National Natural Science Foundation of China (Grant No. 11032007) and the Shanghai Program for Innovative Research Team in Universities.

Biography: Zhu Hong-wei (1984-), Male, Ph. D. Candidate

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Zhu, Hw., Cheng, Pd., Zhong, Bc. et al. Hydrodynamic effects on contaminants release due to rususpension and diffusion from sediments. J Hydrodyn 25, 731–736 (2013). https://doi.org/10.1016/S1001-6058(13)60419-9

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  • DOI: https://doi.org/10.1016/S1001-6058(13)60419-9

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