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

Qingchen Zhou, Hong Chen (), Baohua Cheng, Yu Cheng and Bingbing Guo
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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
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

Sustainability, 2025, vol. 17, issue 4, 1-19

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.

Keywords: urban lake; EFDC model; lake landscape index; hydrodynamics; eutrophication (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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