Abstract
Under the background of rapid urbanization, the urban heat island (UHI) effect is becoming increasingly significant. It is very important for the sustainable development of cities to carry out quantitative research on the mitigation of the UHI effect at an urban scale. Taking Shenzhen as an example, this paper puts forward a method for building a cooling corridor for the city with multiscenarios based on the theory of ecological security pattern (ESP), which can realize quantitative planning of the spatial layout of urban green infrastructure (UGI) to alleviate the UHI effect. In this study, cooling sources are identified from the three dimensions of habitat quality, landscape connectivity, and the capacity to provide cooling ecosystem services. The cooling corridors that are superior at cooling, isolation, and ventilation are selected and optimized. The results show that the identified ecological cooling source area accounts for 33.18% of the total area of Shenzhen, and more than 85% of the area falls within the scope of the basic ecological control line of Shenzhen. There are 48 cooling corridors with a total length of 289.17 km in the cooling priority scenario, which mostly pass through the high-temperature and subhigh-temperature areas of each administrative region and city, providing a good cooling effect but poor feasibility. There are 48 corridors with a total length of 326.66 km in the isolation priority scenario, which mostly pass through the administrative region boundary and have a weak connection with the urban heat island, avoiding the built-up areas with strong human activities. As consequence, cooling is relatively achievable, but its effect is not ideal. There are 47 corridors with a total length of 368.06 km in the ventilation priority scenario, including many urban main roads and river systems that fully utilize the area’s strong natural wind conditions and realize various functions; however, the cooling effect is suboptimal. Corridors with great potential in cooling, isolation, ventilation, and noise reduction were determined after comprehensive optimization.
Highlights
Rapid urbanization transforms the natural and seminatural landscape into a landscape with impervious surfaces, which produces a series of environmental problems, including the urban heat island (UHI) effect [1]
Most studies on urban green infrastructure (UGI) to alleviate the UHI effect have focused on the community scale [16,17], and there have been some suggestions for increasing the presence of UGI at the city scale or planning for a single type of green space, such as urban parks [18,19]
Few studies have carried out quantitative research on the overall UGI spatial layout from the whole city’s perspective
Summary
Rapid urbanization transforms the natural and seminatural landscape into a landscape with impervious surfaces, which produces a series of environmental problems, including the urban heat island (UHI) effect [1]. The spatial patterns of urban green space will significantly affect their mitigation effects on UHI [7,8,9,10]. There is a lack of research on the mitigation of UHI by reasonably planning the spatial patterns of urban green spaces. The concept of green infrastructure (GI) is used in this study to realize urban green space planning to mitigate the UHI effect. Most studies on UGI to alleviate the UHI effect have focused on the community scale [16,17], and there have been some suggestions for increasing the presence of UGI at the city scale or planning for a single type of green space, such as urban parks [18,19]. Few studies have carried out quantitative research on the overall UGI spatial layout from the whole city’s perspective
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