Study on the Supply and Demand Relationship and Enhancement of Cooling Benefits of Urban Green Spaces - A Case Study of Haidian District of Beijing Municipality

Abstract

The balance between the health risks associated with urban heat and the cooling benefits provided by vegetation is crucial for managing thermal hazards in cities. In this study, we used remote sensing technology to analyze temperature inversion and calculate evapotranspiration of vegetation. Based on these findings, we assessed the extent to which cooling benefits match the demand in densely built-up urban areas. We also determined priority areas for planning interventions. The results show that: (1) there is an obvious spatial mismatch between the demand for high-temperature risk links and the supply of cooling benefits in the supply and demand matching of urban cooling benefits in Haidian District, Beijing. (2) The supply of cooling benefits in Haidian District of Beijing shows a pattern of weakening from the edge of the built-up area to the middle, in which green areas and water systems have a cooling radiation effect on the surrounding built-up environment. (3) The urban high-temperature risk zone in Haidian District of Beijing is related to the type of urban sub-surface, with large areas of continuous impermeable sub-surface becoming heat source points in the city. This study provides suggestions and guidance for heat risk urban planning based on vegetation adjustment in cities by exploring the role of urban trees on urban climate, and comparing the supply and demand of cooling benefits of urban green spaces.