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A Study of the Effect of Lake Shape on Hydrodynamics and Eutrophication

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  • Qingchen Zhou

    (College of Hydraulic Engineering, Tianjin Agricultural University, Tianjin 300392, China)

  • Hong Chen

    (College of Hydraulic Engineering, Tianjin Agricultural University, Tianjin 300392, China
    China Agricultural University Joint Smart Water Conservancy Research Center, College of Hydraulic Engineering, Tianjin Agricultural University, Tianjin 300392, China)

  • Baohua Cheng

    (College of Control and Mechanical Engineering, Tianjin Chengjian University, Tianjin 300384, China)

  • Yu Cheng

    (College of Hydraulic Engineering, Tianjin Agricultural University, Tianjin 300392, China)

  • Bingbing Guo

    (College of Hydraulic Engineering, Tianjin Agricultural University, Tianjin 300392, China)

Abstract

As an important part of the urban landscape, lakes not only enhance the overall environmental quality of a city, but also strengthen the residents’ sense of well-being and cultural identity. With the acceleration of urbanization, the water quality and ecological health of urban lakes have become increasingly prominent issues. However, there is a lack of quantitative research on the effects of lake shape on the spatial and temporal distribution of hydrodynamics and water quality. Using the Environmental Fluid Dynamics Code (EFDC) model, this study simulates the hydrodynamic characteristics and water quality responses of an urban lake in Tianjin, focusing on the critical role of lake shape in regulating hydrodynamics and water quality. By quantifying the relationship between lake landscape indices (e.g., shape index, Fractal Dimension) and hydrodynamic parameters, this study reveals how lake shape regulates water flow characteristics and nutrient distribution, thereby influencing eutrophication risk. The results show that regular lakes (e.g., Lake B) exhibit higher flow velocities (0.027 m/s) and significantly lower chlorophyll-a concentrations (6–9 μg/L), reducing eutrophication risk, whereas complex-shaped lakes (e.g., Lake X) have lower flow velocities (0.0087 m/s) and higher localized chlorophyll-a concentrations (13–15 μg/L), increasing the risk of eutrophication. This study systematically quantifies the impact of lake shape on hydrodynamic characteristics and water quality distribution, providing a scientific reference for lake shape optimization, precise water replenishment, and water quality management.

Suggested Citation

  • Qingchen Zhou & Hong Chen & Baohua Cheng & Yu Cheng & Bingbing Guo, 2025. "A Study of the Effect of Lake Shape on Hydrodynamics and Eutrophication," Sustainability, MDPI, vol. 17(4), pages 1-19, February.
    • Handle: RePEc:gam:jsusta:v:17:y:2025:i:4:p:1720-:d:1594409
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    References listed on IDEAS

    as
    1. Wu, Guozheng & Xu, Zongxue, 2011. "Prediction of algal blooming using EFDC model: Case study in the Daoxiang Lake," Ecological Modelling, Elsevier, vol. 222(6), pages 1245-1252.
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