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Joint Optimization of Urban Water Quantity and Quality Allocation in the Plain River Network Area

Author

Listed:
  • Jun Zhao

    (College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China
    College of Civil and Hydraulic Engineering, Bengbu University, Bengbu 233030, China)

  • Guohua Fang

    (College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210024, China)

  • Xue Wang

    (Yellow River Engineering Consulting Co., Ltd., Zhengzhou 450003, China)

  • Huayu Zhong

    (College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210024, China)

Abstract

Cities located in the plain river network area possess abundant water resources. However, due to urbanization and industrialization, there is a severe water shortage problem caused by poor water quality. To overcome this issue, a multi-objective optimal allocation model of water quantity and quality is proposed. The model considers regional water resources, economic, social, and environmental requirements and uses the NSGA-II genetic algorithm for model solution. Furthermore, to evaluate and analyze the degree of spatial equilibrium of regional water resources and how it relates to economic factors, the study uses the spatial equilibrium theory of water resources and the Gini coefficient of water resources. Jingjiang, a city in Jiangsu Province characterized by a typical plain river network area, was selected as the study area. The results of the optimal allocation of water resources in Jingjiang City show that: (1) total water consumption and chemical oxygen demand (COD) emissions for the current planning period are within their respective limits. In addition, the implementation of the water conservation program has resulted in a 5% reduction in total water shortages and a reduction of COD emissions by 1276 tons, (2) the structure of the water supply in Jingjiang City has been optimized; more than 90% of Ⅳ~V surface water is used for agriculture, and the domestic water supply is mainly from transit water, which effectively ensures that high-quality water is used in the domestic water supply, (3) the spatial equilibrium coefficient of water resources per sub-area is between 0.33 and 0.74, indicating an unbalanced or almost unbalanced level. The application of a water conservation program has resulted in the improvement of the spatial equilibrium level of water resources in each sub-area, with an overall spatial equilibrium of 0.64, indicating a more balanced level; the degree of matching of water resources with population, GDP, and land area is at the matching level, (4) according to the Gini coefficient of the distribution of water resources, the plains river network area displays a better match between water resources and economic and social factors of each water receiving area, thanks to its unique geographical location and natural conditions. This study can serve as a decision-making reference for addressing the urban water quality water shortage problem in the plain river network area.

Suggested Citation

  • Jun Zhao & Guohua Fang & Xue Wang & Huayu Zhong, 2024. "Joint Optimization of Urban Water Quantity and Quality Allocation in the Plain River Network Area," Sustainability, MDPI, vol. 16(4), pages 1-17, February.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:4:p:1368-:d:1334336
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    References listed on IDEAS

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