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Understanding the relationship between urban blue infrastructure and land surface temperature
Caiyan Wu1, Junxiang Li2, Chunfang Wang3
1School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, PR China.
The Science of the Total Environment
|November 24, 2019
Summary
Urban blue infrastructure (UBI), like urban surface water, effectively mitigates the urban heat island (UHI) effect. UBI
Area of Science:
- Environmental Science
- Urban Planning
- Remote Sensing
Background:
- Urban heat island (UHI) effect negatively impacts urban ecosystems and human health.
- Urban green infrastructure (UGI) is known to mitigate UHI, but the role of urban blue infrastructure (UBI) is less understood.
- UBI's cooling potential via evaporation is comparable to UGI's evapotranspiration.
Purpose of the Study:
- To investigate the relationship between UBI and land surface temperature (LST) in Wuhan, China.
- To assess the cooling effects of UBI using normalized difference water index (NDWI), cooling intensity, and cooling distance.
- To provide insights for urban planning on utilizing UBI for thermal environment improvement.
Main Methods:
- Utilized normalized difference water index (NDWI) to map UBI distribution.
- Analyzed the relationship between mean LST and NDWI.
- Quantified cooling effects based on UBI size and shape, including cooling intensity and distance.
Main Results:
- A significant negative linear relationship was found between mean LST and NDWI above a critical threshold.
- UBI's cooling effects are dependent on its size and shape.
- Water surface temperature decreased logarithmically with increasing UBI size, with critical thresholds for maximum cooling efficiency.
Conclusions:
- NDWI is an effective parameter for assessing UBI's cooling impact.
- UBI size and shape significantly influence cooling intensity and distance, with seasonal and spatial variations.
- UBI is a valuable nature-based solution for mitigating UHI and improving urban thermal environments.
Keywords:
Cooling effectLand surface temperatureNormalized difference water indexUrban blue infrastructureUrban heat islandMore Related Videos
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