Ecological restoration for eutrophication mitigation in urban interconnected water bodies: Evaluation, variability and strategy

Wang，Linlin1; Shao，Huaihao2; Guo，Yuehua3; Bi，Hongsheng4; Lei，Xiaoyu5; Dai，Shuangliang2; Mao，Xianzhong2; Xiao，Kai6; Liao，Xiaomei1; Xue，Hao7

2024-08-01

10.1016/j.jenvman.2024.121475

Journal of Environmental Management   影响因子和分区

0301-4797

1095-8630

Many urban water bodies grapple with low flow flux and weak hydrodynamics. To address these issues, projects have been implemented to form integrated urban water bodies via interconnecting artificial lake or ponds with rivers, but causing pollution accumulation downstream and eutrophication. Despite it is crucial to assess eutrophication, research on this topic in urban interconnected water bodies is limited, particularly regarding variability and feasible strategies for remediation. This study focused on the Loucun river in Shenzhen, comprising an pond, river and artificial lake, evaluating water quality changes pre-(post-)ecological remediation and establishing a new method for evaluating the water quality index (WQI). The underwater forest project, involving basement improvement, vegetation restoration, and aquatic augmentation, in the artificial lake significantly reduced total nitrogen (by 43.58%), total phosphorus (by 79.17%) and algae density (by 36.90%) compared to pre-remediation, effectively controlling algal bloom. Rainfall, acting as a variable factor, exacerbated downstream nutrient accumulation, increasing total phosphorus by 4.56 times and ammonia nitrogen by 1.30 times compared to the dry season, and leading to algal blooms in the non-restoration pond. The improved WQI method effectively assesses water quality status. The interconnected water body exhibits obvious nutrient accumulation in downstream regions. A combined strategy that reducing nutrient and augmenting flux was verified to alleviate accumulation of nutrients downstream. This study provides valuable insights into pollution management strategies for interconnected pond-river-lake water bodies, offering significant reference for nutrient mitigation in such urban water bodies.

Ecological remediation Eutrophication mitigation Source reduction Water quality index

EI

英语

其他

20242516288451

Ammonia ; Forestry ; Lake pollution ; Lakes ; Nitrogen ; Nutrients ; Phosphorus ; Quality control ; Restoration ; River pollution ; Rivers ; Water quality

Water Analysis:445.2 ; Water Pollution:453 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2 ; Agricultural Equipment and Methods; Vegetation and Pest Control:821 ; Quality Assurance and Control:913.3

ENVIRONMENT/ECOLOGY

2-s2.0-85196258205

Scopus

1.College of Life Sciences and Oceanography,Shenzhen University,Shenzhen,518060,China
2.Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen,518055,China
3.China Communications First Harbor Bureau Ecological Engineering Co.,LTD,Shenzhen,518055,China
4.University of Maryland Center for Environmental Science,Chesapeake Bay Laboratory,Solomons,20688,United States
5.Department of Research Affairs,Shenzhen MSU-BIT University,Shenzhen,518055,China
6.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
7.Chinese Research Academy of Environmental Sciences,Beijing,100012,China

Wang，Linlin,Shao，Huaihao,Guo，Yuehua,et al. Ecological restoration for eutrophication mitigation in urban interconnected water bodies: Evaluation, variability and strategy[J]. Journal of Environmental Management,2024,365.

Wang，Linlin.,Shao，Huaihao.,Guo，Yuehua.,Bi，Hongsheng.,Lei，Xiaoyu.,...&Xue，Hao.(2024).Ecological restoration for eutrophication mitigation in urban interconnected water bodies: Evaluation, variability and strategy.Journal of Environmental Management,365.

Wang，Linlin,et al."Ecological restoration for eutrophication mitigation in urban interconnected water bodies: Evaluation, variability and strategy".Journal of Environmental Management 365(2024).