Spatial distribution of urban heat island in Hangzhou and its mitigation countermeasures

Taking Hangzhou City in summer as a case, the thermal infrared remote sensing image (Landsat 5 TM) was used to extract and inverse the surface land cover types and surface temperature of Hangzhou City. The spatial distribution characteristics of urban heat island was analyzed in the city-scale through the thermal field analysis and profile analysis method. The corresponding relationship between the spatial distribution characteristics of Hangzhou urban heat island and landuse types were revealed. Then, the generative mechanisms of Hangzhou urban heat island were analyzed in the aspects of the evolution of urban landuse types, the changes of urban spatial pattern, the rationality of the urban land layout, and the emission of anthropogenic heat. Finally, in the perspective of urban planning, some mitigation countermeasures including the reasonable control of the expansion of urban landuse, construction of the urban ecological open space, optimization of the layout of urban landuse, and planning for underlaying surface were put forward. This aims to provide a reference to work in improving the thermal environment of Hangzhou City.