The influence of landscape characteristics of a park green space on the park cool island effect in Zhengzhou City

Urban parks help to alleviate the urban heat island effect and reduce the energy consumption of urban cooling. Select 44 major parks in the downtown area of ​​Zhengzhou, use Landsat8 remote sensing data and land use data, and combine ENVI, ArcGIS, Fragstats, SPSS and other software to analyze park cold islands The influencing factors of the effect. The research on the intensity of the cold island is carried out from three levels of landscape characteristics, landscape composition, and landscape configuration. The results show that controlling the park area at about 20 hm2 under the limited site conditions can produce a higher cold island intensity; parks The simpler the boundary, the stronger the cold island effect, while the more complex the boundary between plants and impervious surface patches, the stronger the cold island effect in parks; the cooling effect of parks with water bodies in the same area is about 1℃ different from that of parks without water bodies; water bodies The proportion is controlled at about 14%. The intensity of the cold island in the park is more significant; in the park landscape configuration, the combination of plants and water bodies in the park can produce better than the combination of impervious surfaces and plants and the combination of impervious surfaces and water bodies. The standard deviation ellipse tool was used to further analyze the directionality of the park's cold island strength and found that the park's cold island direction is mainly related to the long axis of the water body in the park and the distribution of high-rise buildings outside the park.