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An optimization framework for basin-scale water environmental carrying capacity.

Jue Ding1, Qiuwen Chen1, Yuchen Chen1

  • 1State Key Laboratory of Hydrology-Water Resources & Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing, 210098, China; Center for Eco-Environment Research, Nanjing Hydraulic Research Institute, Nanjing, 210098, China.

Journal of Environmental Management
|December 3, 2023
PubMed
Summary

This study developed a water environmental carrying capacity (WECC) framework to balance socio-economic development and water resources. Optimization significantly increased WECC and reduced pollution, enhancing sustainable development in the Anhui-Huaihe Basin.

Keywords:
Bottom-up optimizationPollution dischargeRegional matchingSocial economySustainable developmentWater environmental carrying capacity

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Area of Science:

  • Environmental Science and Engineering
  • Water Resource Management
  • Regional Economics

Background:

  • Quantifying the complex interactions between water environments and socio-economic development at a basin scale is a significant challenge.
  • Existing models often struggle to integrate diverse factors like water quality, pollution, administrative divisions, and economic activities.
  • Sustainable development necessitates a framework that can optimize resource utilization while minimizing environmental impact.

Purpose of the Study:

  • To propose and validate an integrated framework for assessing and optimizing water environmental carrying capacity (WECC).
  • To establish parametric connections between water resources, contaminants, administrative regions, and socio-economic activities.
  • To analyze the impact of socio-economic development on WECC and identify optimization strategies for sustainable basin management.

Main Methods:

  • Development of the water environmental carrying capacity (WECC) optimization framework, integrating socio-economic parameters, a water environmental model, an optimization model, and sensitivity analysis.
  • Application of the framework to the Anhui-Huaihe Basin, considering nine administrative regions and three economic factors: industry, agriculture, and GDP per capita (pGDP).
  • Analysis of pollution discharge (COD, NH4-N) and key regulatory parameters (e.g., industrial treatment rates, farmland standards, rural sewage treatment) to identify optimization pathways.

Main Results:

  • The current WECC in the Anhui-Huaihe Basin is insufficient for socio-economic development needs.
  • Optimization increased WECC for industry, agriculture, and pGDP by 22.40%, 26.59%, and 15.08% respectively, while decreasing COD and NH4-N discharge by 13.6% and 14.7%.
  • Specific regional strategies were identified, including enhancing industrial treatment rates, improving farmland standards, increasing scale breeding ratios, and improving rural domestic sewage collection and treatment.

Conclusions:

  • The proposed WECC optimization framework effectively captures basin-scale interactions and guides sustainable development.
  • Optimized management strategies significantly improve water quality and carrying capacity, crucial for balancing economic growth and environmental protection.
  • Both interregional allocation and intraregional planning are essential for achieving comprehensive basin optimization and harmonious development.