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Impact of intermittent turbulent bursts on sediment resuspension and internal nutrient release in Lake Taihu, China

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Abstract

Intermittent turbulent bursts have great impacts on sediment resuspension in coastal regions, tidal estuaries, and lakes. In this study, the role of turbulence structure on sediment resuspension was examined at Meiliang Bay of Lake Taihu, the third largest freshwater lake in China. The instantaneous three-dimensional velocity and suspended sediment concentrations were synchronously recorded by Acoustic Doppler Velocimetry (ADV) and Optical Backscatter Sensor (OBS) placed close to the lakebed. Statistical and quadrant analyses results revealed that the coherent structure contributed significantly to sediment particle entrainment. The intermittent burst events (dominant ejection and sweep) were the main energy source for sediment resuspension processes. 99.2% of turbulent sediment fluxes were triggered by ejection and sweep events, whereas the contributions coming from the outward interactions and inward interactions were relatively small. The large-amplitude burst events in the coherent structure dominated the influence on the sediment diffusion. Additionally, it was found that instantaneous sediment particle entrainment occurred earlier than the mean critical shear stress, which was induced by the stochastic nature of turbulence. The amount of sediment flux considering the turbulence characteristics was one or two larger magnitudes than the flux amount assessed by the time-averaged flow field, which indicated the critical shear stress approach might underestimate the sediment resuspension. Therefore, the influence of turbulence performance on sediment entrainment shall be seriously considered when evaluating sediment flux and internal nutrient loads in Lake Taihu.

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Funding

The research was supported by the National Key R&D Program of China (2017YFC0405203), Fundamental Research Funds for the Central Universities (No. 2017B20514), Chinese National Science Foundation (51809102, 51579071), Fundamental Research Funds for the Central Public-Interest Research Institute (PM-zx703-201803-081), and the Major Science and Technology Program for Water Pollution Control and Treatment (2017ZX07202006-002).

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Authors and Affiliations

  1. Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, College of Environment, Hohai University, Nanjing, 210098, China

    Chunyan Tang & Yiping Li

  2. South China Institute of Environmental Sciences, the Ministry of Ecology and Environment of PRC, Guangzhou, 510535, China

    Chunyan Tang & Xiaomeng Gao

  3. Division of Hydrologic Sciences, Desert Research Institute, Las Vegas, NV, 89119, USA

    Kumud Acharya

  4. Nanjing Institute of Environmental Sciences, the Ministry of Ecology and Environment of PRC, Nanjing, 210042, China

    Wei Du

  5. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing, 210008, China

    Liancong Luo

  6. College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China

    Zhongbo Yu

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  1. Chunyan Tang
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  2. Yiping Li
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  3. Kumud Acharya
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  4. Wei Du
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  5. Xiaomeng Gao
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  6. Liancong Luo
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  7. Zhongbo Yu
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Correspondence to Yiping Li or Kumud Acharya.

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Responsible editor: Boqiang Qin

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Tang, C., Li, Y., Acharya, K. et al. Impact of intermittent turbulent bursts on sediment resuspension and internal nutrient release in Lake Taihu, China. Environ Sci Pollut Res 26, 16519–16528 (2019). https://doi.org/10.1007/s11356-019-04847-2

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  • DOI: https://doi.org/10.1007/s11356-019-04847-2

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