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The win-win interaction between integrated blue and green space on urban cooling
1College of Horticulture and Landscape Architecture, Yangzhou University, 225000, China.
The Science of the Total Environment
|December 12, 2022
Summary
Integrating urban blue-green spaces enhances cooling effects. Combined water bodies and green spaces provide greater cooling than either alone, offering vital insights for sustainable urban planning.
Area of Science:
- Environmental Science
- Urban Planning
- Climate Change Mitigation
Background:
- Urban blue and green spaces are recognized for their cooling contributions.
- The synergistic cooling effect of integrated blue-green spaces is not well understood.
Purpose of the Study:
- To investigate the combined cooling effect of coexisting urban blue and green spaces.
- To determine the interaction between water bodies and green spaces for urban cooling.
- To identify key factors influencing the cooling efficacy of riverside green spaces.
Main Methods:
- Utilized a combination of urban climate modeling and observational analyses.
- Compared temperature reductions in riverside green spaces versus non-riverside green spaces.
- Assessed the impact of water body integration and riverbank vegetation on temperature.
Main Results:
- Integrated blue-green spaces exhibit a synergistic cooling effect, outperforming standalone elements.
- Riverside green space cooling is influenced by river width and contact, not area or shape.
- Riverside green spaces showed significant daytime temperature reductions (up to 4.2°C surface, 3.7°C air in summer).
- Green spaces with internal water bodies reduced land surface temperature (LST) by 0.99°C (spring) and 1.45°C (summer).
- River reaches with adjacent green spaces experienced 1°C–2.9°C greater air temperature reduction.
- 30m vegetated riverbanks increased LST deduction by 3.1°C (spring) and 3.37°C (summer).
Conclusions:
- The integration of urban blue and green spaces creates a mutually reinforcing cooling effect.
- River width and connectivity are critical for riverside green space cooling efficacy.
- Findings provide crucial data for optimizing urban planning strategies for climate resilience.
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