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Longitudinal dispersion coefficients of pollutants in compound channels with vegetated floodplains

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Abstract

The characteristics of the longitudinal dispersion of pollutants in compound channels remain unclear. This study examines the relationships among the vegetation density, the width of the floodplain, the water depth ratio, the cross-sectional mean velocity, and the longitudinal dispersion coefficient of a symmetrical compound channel with a rigid non-submerged vegetated floodplain. The longitudinal dispersion coefficient is found to increase significantly with the presence of vegetation on floodplains, and is positively correlated with the plant density. When the density of the vegetation on the floodplains exceeds a certain value, the dispersion coefficient no longer changes with the vegetation density. The longitudinal dispersion coefficient is found to increase with the increase of the width of the floodplain. Moreover, the combined effects of the mean velocity and the water depth ratio have a positive correlation with the dispersion coefficient. The effects of the vegetation on the longitudinal dispersion coefficient in the channels with various cross-sections are also compared. The compound channels with a vegetated floodplain are found to differ significantly from the channels with a rectangular cross-section.

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Acknowledgements

This work was supported by the Fundamental Research Funds for the Central Universities (Grant No. 2016B06714), the PAPD Project and the National Public Research Institutes for Basic R&D Operating Expenses Special Project (Grant No. CKSF2015050/SL).

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Authors and Affiliations

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

    Li Gu, Zi-nan Jiao, Zu-lin Hua & Xiao-dong Liu

  2. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing, 210098, China

    Li Gu, Zu-lin Hua & Xiao-dong Liu

  3. Nanjing Guohuan Science and Technology Co., Ltd., Nanjing, 210001, China

    Xin-xin Zhao

  4. Changjiang River Scientific Research Institute, Wuhan, 430010, China

    Ling-hang Xing

Authors
  1. Li Gu
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  2. Xin-xin Zhao
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  3. Ling-hang Xing
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  4. Zi-nan Jiao
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  5. Zu-lin Hua
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  6. Xiao-dong Liu
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Corresponding author

Correspondence to Zu-lin Hua.

Additional information

Project supported by the National Natural Science Foundation of China (Grant Nos. 51739002, 51379058, 51479064 and 51479010).

Biography: Li Gu (1981-), Female, Ph. D., Associate Professor

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Gu, L., Zhao, Xx., Xing, Lh. et al. Longitudinal dispersion coefficients of pollutants in compound channels with vegetated floodplains. J Hydrodyn 31, 740–749 (2019). https://doi.org/10.1007/s42241-018-0108-4

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  • DOI: https://doi.org/10.1007/s42241-018-0108-4

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