Study on the Effect and Influencing Factors of Urban Green Space on Thermal Environment: A Case Study of Mianyang City Center

Abstract

Due to the rapid expansion of urban development, green space is occupied, urban landscape and ecological environment are greatly damaged, and urban thermal environment problems are prominent and severe. Based on GIS and RS, this paper analyzes the evolution of thermal environment and green space in Mianyang city center from 2002 to 2021, analyzes the correlation between various elements of green space and land surface temperature, and further studies the influence and mechanism of urban green space on urban thermal environment. The following conclusions are drawn: 1) From 2002 to 2021, the area covered by urban green space generally shows a decreasing trend; The area of urban high temperature area is gradually increased, and the urban heat island effect is gradually strengthened. 2) The minimum temperature inside the green space patch was negatively correlated with its perimeter characteristics and area characteristics, and the correlation between the green space area and the urban thermal environment was slightly higher than the perimeter; 3) There was a significant negative correlation between the LSI (shape index) of green spatial patches and the minimum internal temperature; There is a significant positive correlation between the girth area ratio and the internal correlation. 4) There is an obvious negative correlation between surface temperature and vegetation coverage in the study area. The conclusion can provide a scientific basis for the urban planning of urban center to alleviate the thermal environment from the green space, so as to improve the urban thermal environment.